Consulta: subjectFacets:"Research Methods/ Statistical Methods"
Registros recuperados: 2.166
Data/hora: 06/06/2024 02:42:18

Generalization of the Generalized Composite Commodity Theorem: Extension based on the Theil’s Aggregation Theory
Provedor de dados: 31
Autores: Kwon,   Dae-Heum; Bessler,   David A.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49335

RESPONDENTS TO CONTINGENT VALUATION SURVEYS: CONSUMERS OR CITIZENS? - REPLY
Provedor de dados: 31
Autores: Blamey,   Russell K.; Common,   Mick S.; Quiggin,   John C.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/22391

A NONLINEAR MODEL OF INFORMATION AND COORDINATION IN HOG PRODUCTION: TESTING THE COASIAN-FOWLERIAN DYNAMIC HYPOTHESES
Provedor de dados: 31
Autores: Ruth,   Matthias; Cloutier,   L. Martin; Garcia,   Philip.
The pig-cycle 'explanation' expunded by Coase and Fowler followed a well-integrated economic logic and provides tremendous insight into our understanding of commodity cycles.  The paper presents a simulation model that replicates all of Coase and Fowler's results and tests its robustness with an application to U.S. hog production.
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20971

Extended generalized linear models: Simultaneous estimation of flexible link and variance functions
Provedor de dados: 31
Autores: Basu,   Anirban.
I describe a command that simultaneously solves the extended estimating equations estimator for parameters in the link and variance functions along with those of the linear predictor in a generalized linear model. The method addresses difficulties in choosing the correct link and variance functions in these models. It decouples the scale of estimation for the mean model, determined by the link function, from the scale of interest for the scientifically relevant effects. It also estimates a flexible variance structure from the data, leading to efficient estimation.
Tipo: Journal Article
Palavras-chave: Pglm; Pglmpredict; EEE; GLM; Skewed; Costs; Estimating equations; Link functions; Variance functions; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117541

Differences of county economic development in Hebei Province based on realistic competitiveness
Provedor de dados: 31
Autores: Han,   Su-qing.
Rural Development
Tipo: Thesis or Dissertation
Palavras-chave: County economy; Economic differences; Realistic competitiveness; Hebei Province; China; Agribusiness; Community/Rural/Urban Development; Production Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53436

ASSESSING CONSUMERS’ WILLINGNESS TO PAY FOR DIFFERENT UNITS OF ORGANIC MILK: EVIDENCE FROM MULTI-UNIT AUCTIONS
Provedor de dados: 31
Autores: Akaichi,   Faiçal; Gil,   Jose Maria; Nayga,   Rodolfo M., Jr.
Replaced with revised version of paper 06/28/10
Tipo: Conference Paper or Presentation
Palavras-chave: Multi-unit Vickrey auctions; Organic milk; Information; Agribusiness; Consumer/Household Economics; Demand and Price Analysis; Marketing; Research Methods/ Statistical Methods; C91; D44.
Ano: 2009
URL: http://purl.umn.edu/60982

Stata tip 18: Making keys functional
Provedor de dados: 31
Autores: Driver,   Shannon.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117507

Theory testing (hypothesis testing) in agricultural economics
Provedor de dados: 31
Autores: Meszaros,   Sandor.
According to Karl Popper, economics and agricultural economics should be deemed scientific if the theories (hypotheses) are subject to strict tests. The testing of agro-economic theories goes back 50 years in the USA, Canada, Europe, and Japan, and these methods are becoming increasingly part of educational research methodology. In fact, the author of this paper teaches this very subject at Debrecen University, and for this reason has endeavoured to provide an overview on current trends in this field. The present overview first discusses the role of testing in the research process (cognition), and then analyses the various classification methods (types) of testing. It deals in detail with the application of the (microeconomic) production-theory in...
Tipo: Journal Article
Palavras-chave: Theory testing; Hypotheses testing; Economics; Agricultural economics; Production-theory; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/46658

JAAE Front page
Provedor de dados: 31
Includes: Front Cover, Editorial Information, JAAE Manuscript Submission Guidelines
Tipo: Report
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2011
URL: http://purl.umn.edu/113515

Factors Influencing Grain Production of Henan Province Based on Gray Correlation
Provedor de dados: 31
Autores: Li,   Qiufang; Kang,   Guolei; Li,   Xiaofang; Li,   Bingjun.
The authors analyze the existing problems and macroscopic influencing factors in grain production of Henan Province, and then carry out an empirical study on the correlation between grain production and eight influencing factors in Henan Province of China by using the gray correlation analysis method. Finally, this paper puts forward related suggestions.
Tipo: Thesis or Dissertation
Palavras-chave: Grain production; Input factor; Gray correlation analysis; China; Agricultural and Food Policy; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53587

Combinatorial optimisation of a large, constrained simulation model: an application of compressed annealing
Provedor de dados: 31
Autores: Doole,   Graeme J.; Pannell,   David J.
Simulation models are valuable tools in the analysis of complex, highly constrained economic systems unsuitable for solution by mathematical programming. However, model size may hamper the efforts of practitioners to efficiently identify the most valuable configurations. This paper investigates the efficacy of a new metaheuristic procedure, compressed annealing, for the solution of large, constrained systems. This algorithm is used to investigate the value of incorporating a sown annual pasture, French serradella (Ornithopus sativa Brot. cv. Cadiz), between extended cropping sequences in the central wheat belt of Western Australia. Compressed annealing is shown to be a reliable means of considering constraints in complex optimisation problems in...
Tipo: Conference Paper or Presentation
Palavras-chave: Combinatorial optimisation; Crop rotation; Simulated annealing; Research Methods/ Statistical Methods; C63; Q15.
Ano: 2007
URL: http://purl.umn.edu/10438

ESTIMATING SAMPLING VARIANCE FROM THE CURRENT POPULATION SURVEY: A SYNTHETIC DESIGN APPROACH TO CORRECTING STANDARD ERRORS
Provedor de dados: 31
Autores: Jolliffe,   Dean.
Essentially all empirical questions that are addressed with sample data require estimates of sampling variance. The econometrics and statistics literatures show that these estimates depend critically on the design of the sample. The sample for the U.S. Current Population Survey (CPS), which serves as the basis for official poverty, unemployment, and earnings estimates, results from a stratified and clustered design. Unfortunately, analysts are frequently unable to estimate sampling variance for many CPS statistics because the variables marking the strata and clusters are censored from the public-use data files. To compensate for this, the Bureau of Census provides a method to approximate the sampling variance for several, specific point estimates, but no...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19628

Simplified Marginal Effects in Discrete Choice Models
Provedor de dados: 31
Autores: Anderson,   Soren T.; Newell,   Richard G.
We show that after a simple normalization of explanatory variables so that they equal zero at some desired reference point, marginal effects for continuous variables in probit and logit models simplify dramatically, becoming a function of only the estimated constant term. We present similar simplifications for computation of the asymptotic variance of marginal effects, as well as for the effects of dummy variables on predicted probabilities. We provide a simple table, which in combination with raw probit or logit estimates, is all one needs to compute the desired effects.
Tipo: Working or Discussion Paper
Palavras-chave: Logit; Probit; Discrete choice; Binary choice; Marginal effect; Data normalization; Research Methods/ Statistical Methods; C25; C51; C81.
Ano: 2003
URL: http://purl.umn.edu/10631

Review of An Introduction to Modern Econometrics Using Stata by Baum
Provedor de dados: 31
Autores: Nichols,   Austin.
This article reviews An Introduction to Modern Econometrics Using Stata by Christopher F. Baum.
Tipo: Article
Palavras-chave: Econometrics; Textbook; Ivreg; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119260

Estimating the Carbon Footprint of Florida Orange Juice
Provedor de dados: 31
Autores: Spreen,   Thomas H.; Dwivedi,   Puneet; Goodrich-Schneider,   Renee.
This study is a part of a comprehensive study which attempts to create a baseline of global warming impact (expressed in total greenhouse gas emission and measured in terms of carbon equivalent) associated with the production and consumption of a gallon of orange juice available in the form of NFC (Not from Concentrate) and FCOJ (Frozen Concentrated Orange Juice) in Florida. A detailed life‐cycle approach is adopted and greenhouse gas emissions of all the steps in the supply chain starting from citrus nursery management to the point where customer purchases juice from a food store are considered. This study reports total greenhouse gas emission related with the management of an acre orange grove under the two scenarios of with and without resetting of...
Tipo: Conference Paper or Presentation
Palavras-chave: Greenhouse Gas Emission; Orange Juice; Life‐Cycle Analysis; Florida; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100461

Interests and goals in the agricultural higher education system of Hungary – a methodological approach
Provedor de dados: 31
Autores: Hajdu,   Istvanne; Lakner,   Zoltan.
In recent decades the Hungarian intelligentsia, both political and governmental, emphasised the importance of higher education in socio-economic modernisation. At the same time, after nearly twenty years of system-transition we have to see that the ambitious goals of reforms in many cases have been turned into their opposite. This paper analyses the key actors and their strategies in the higher education system, highlighting the most important obstacles to development based on a multi-actor strategy model, based on institutional economy and principle-agent theory. The results show considerable divergence in force and interest-structure of different actors. As a consequence of relationship of forces it has been shown that, without steadfast governmental...
Tipo: Journal Article
Palavras-chave: Institutional economics; MACTOR; Policy analysis; Social bargaining; Stakeholder analysis; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/52200

Evaluation of Urban Land Intensive Use Based on Analytic Hierarchy Process - A Case of Zhongxiang City, Hubei Province, China
Provedor de dados: 31
Autores: Luo,   Xin-mao; He,   Hong-wei; Ke,   Xin-li.
Taking Zhongxiang City, Hubei Province, China as an example, evaluation index system of urban land intensive use is established from four aspects of land economic benefit, land utilization degree, investment intensity, and sustainable utilization. Analytic Hierarchy Process (AHP) is used to determine the weight of evaluation index in research region. Taking the index numerical value of Hubei Province as the standard value, index value of the research region is evaluated. Combining with the index weight obtained by AHP, urban land intensive use is evaluated by the weighted average. Result shows that land intensive use level of Zhongxiang City is much lower than the average level of Hubei Province. Therefore, urban land of Zhongxiang City is of is great...
Tipo: Thesis or Dissertation
Palavras-chave: Urban land; Intensive use; Analytic Hierarchy Process; Zhongxiang City; China; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/58482

Estimation of a Censored AIDS Model: A Simulated Amemiya-Tobin Approach
Provedor de dados: 31
Autores: Dong,   Diansheng; Kaiser,   Harry M.
Kuhn-Tucker approach and its dual have been proposed to the demand system estimation when there are non-negativity bindings. However, empirical researchers have been struggling two decades in applying this method into practice due to: (1) the difficulty in derivation of a coherent econometric model, and (2) the cumbersome evaluation of high order probability integrals needed in parameter estimation. In this paper, we avoid the above two issues by using the Amemiya-Tobin demand system approach and the simulation procedure to evaluate the probability integrals. An AIDS model is estimated and the elasticities are obtained that are impossible to achieve when using Kuhn-Tucker approach. The model is applied to an analysis of Canadian household food demand.
Tipo: Technical Report
Palavras-chave: Amemiya-Tobin; Censored demand system; AIDS model; Probability simulation; Canadian household food demand; Demand and Price Analysis; Research Methods/ Statistical Methods; C34; D12.
Ano: 2003
URL: http://purl.umn.edu/122113

Modeling of the cure fraction in survival studies
Provedor de dados: 31
Autores: Lambert,   Paul C.
Cure models are a special type of survival analysis model where it is assumed that there are a proportion of subjects who will never experience the event and thus the survival curve will eventually reach a plateau. In population-based cancer studies, cure is said to occur when the mortality (hazard) rate in the diseased group of individuals returns to the same level as that expected in the general population. The cure fraction is of interest to patients and a useful measure to monitor trends and differences in survival of curable disease. I will describe the strsmix and strsnmix commands, which t the two main types of cure fraction model, namely, the mixture and nonmixture cure fraction models. These models allow incorporation of the expected background...
Tipo: Article
Palavras-chave: Strsmix; Strsnmix; Predict; Relative survival; Cure models; Split population models; Postestimation; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119281

Stata tip 55: Better axis labeling for time points and time intervals
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119299

From the help desk: Kaplan–Meier plots with stsatrisk
Provedor de dados: 31
Autores: Linhart,   Jean Marie; Pitblado,   Jeffrey S.; Hassell,   James.
stsatrisk is a wrapper for sts graph that adds a table to a survival plot with at-risk information, making it easy to create graphs that follow the list of recommendations given by Pocock et al. (2002) for Kaplan–Meier plots. We use stsatrisk to create plots in the desired format with the desired information.
Tipo: Journal Article
Palavras-chave: Stsatrisk; Kaplan–Meier; Survival plots; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116212

Boolean logit and probit in Stata
Provedor de dados: 31
Autores: Braumoeller,   Bear F.
This paper introduces new statistical models, Boolean logit and probit, that allow researchers to model binary outcomes as the results of Boolean interactions among independent causal processes. Each process (or “causal path”) is modeled as the unobserved outcome in a standard logit or probit equation, and the dependent variable is modeled as the observed product of their Boolean interaction. Up to five causal paths can be modeled, in any combination—A and B and C produce Y, A and (B or [C and D]) produce Y, etc.
Tipo: Journal Article
Palavras-chave: Mlboolean; Dichotomous dependent variable; Boolean; Logit; Probit; Multiple causal paths; Complexity; Random utility; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116271

A note on the performance measure of conservation auctions
Provedor de dados: 31
Autores: Latacz-Lohmann,   Uwe; Schilizzi,   Steven.
We argue that previous assessments of discriminatory-price conservation auctions may have systematically overestimated their performance relative to uniform-payment schemes due to an inappropriate counterfactual comparison. We demonstrate that the cost curve (and not the bid curve) is the relevant supply curve when a uniform payment is offered and provide a theoretically rigorous counterfactual based on that insight. We estimate that the performance of BushTender may have been overrated by more than 50%.
Tipo: Working or Discussion Paper
Palavras-chave: Auctions; Procurement; Tenders; Conservation; Economic experiments; Model validation; Plus: assessment method; Agricultural policy; Environmental policy; Market-based instruments; Environmental Economics and Policy; Research Methods/ Statistical Methods; C91; C92; D44; Q24; Q28.
Ano: 2011
URL: http://purl.umn.edu/100885

EMPIRICAL SPECIFICATION REQUIREMENTS FOR TWO-CONSTRAINT MODELS OF RECREATION DEMAND
Provedor de dados: 31
Autores: Larson,   Douglas M.; Shaikh,   Sabina L.
Theoretical restrictions implied by the two-constraint recreation demand model are developed.  The structure necessary to specify empirical models shows that most current models of recreation incorporate time in a manner inconsistent with theory.  Results are applicable to all recreationists and are particularly useful to those with endogenous marginal values of time.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/21629

A brief history of Stata on its 20th anniversary
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117491

Indicators
Provedor de dados: 31
Autores: Adelson,   Laura; Dohlman,   Erik.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122576

Sequence analysis with Stata
Provedor de dados: 31
Autores: Brzinsky-Fay,   Christian; Kohler,   Ulrich; Luniak,   Magdalena.
We describe a general strategy to analyze sequence data and introduce SQ-Ados, a bundle of Stata programs implementing the proposed strategy. The programs include several tools for describing and visualizing sequences as well as a Mata library to perform optimal matching using the Needleman–Wunsch algorithm. With these programs Stata becomes the first statistical package to offer a complete set of tools for sequence analysis.
Tipo: Journal Article
Palavras-chave: Sqclusterdat; Sqclustermat; Sqdes; Sqindexplot; Sqom; Sqparcoord; Sqset; Sqstatlist; Sqstatsum; Sqstattab1; Sqstattab2; Sqstattabsum; Sqtab; Sequence analysis; Optimal matching; Cluster analysis; Panel data; Longitudinal data; Explorative data analysis; Sequence index plot; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/118169

The 24th hour of agricultural research
Provedor de dados: 31
Autores: Vida,   Adrienn; Baksa,   Adrienn.
Economic and social changes occurring in Hungary and all over the world mean new challenges for sciences. This trend goes also for agriculture; globalization, climate change, the increase in population and food demand, and the decrease of land used for food production at the same time cause problems that can be solved by means of sciences. The year 2007 was the beginning of a new era in agriculture and rural development. The financial period of 2007-2013 presents an essentially new situation in the European Union, so agricultural universities, high schools and research institutes, as well as market operators must undertake serious changes. As Hungary is basically an agricultural country; agriculture plays an important role in national economy, therefore...
Tipo: Journal Article
Palavras-chave: Agrobusiness; Sectorial structure; Research and development (R+D); Competitiveness; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/47559

Applying regression quantiles to farm efficiency estimation
Provedor de dados: 31
Autores: Kaditi,   Eleni A.; Nitsi,   Elisavet I.
This article is concerned with the methodological question of frontier production functions estimation for agriculture, and the appropriateness of regression quantiles, as a useful semi-parametric approach. Better insights are reached using the proposed methodology that provides robust farm efficiency scores estimates. Using the 2007 Farm Accountancy Data Network (FADN) data for Greece, analysis shows that the distribution of efficiency scores is closer to normality when employing regression quantiles, while underestimation of efficiency obtained by other parametric or deterministic methods based on the conditional mean can be avoided. The results further suggest that government support aimed at enhancing farms viability should be directed towards payments...
Tipo: Conference Paper or Presentation
Palavras-chave: Efficiency; Quantile Regression; Agriculture; Agricultural and Food Policy; Productivity Analysis; Research Methods/ Statistical Methods; C14; D24; Q18.
Ano: 2010
URL: http://purl.umn.edu/61081

A MONTE CARLO COMPARISON OF ALTERNATIVE ESTIMATORS OF AUTOCORRELATED SIMULTANEOUS SYSTEMS USING A U.S. PORK SECTOR MODEL AS THE TRUE  STRUCTURE
Provedor de dados: 31
Autores: Naik,   Gopal; Dixon,   Bruce L.
Monte Carlo analysis of the performance of alternative estimators of simultaneous system's coefficients in the presence of autocorrelation is performed.  The "true" underlying model is an estimated, three-equation, monthly model of the U.S. pork market.  Estimators for ex post forecasts are also compared.  Multicollinearity is found to be a salient characteristic likely adversely affecting estimator performance.  Results show that correcting for autocorrelation is desirable when levels of autocorrelation are high for both parameter accuracy and ex post forecasting.  However, the best structural coefficient estimator for high levels of autocorrelation is not necessarily the best estimator for ex post forecasting.
Tipo: Journal Article
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/32250

TEMPORAL PAYMENT ISSUES IN CONTINGENT VALUATION ANALYSIS
Provedor de dados: 31
Autores: Bond,   Craig A.; Giraud,   Kelly L.; Larson,   Douglas M.
We analyze agent response to disparate payment schedules for protection of critical habitat units for the Seller sea lion in Alaska. The model allows for identification of implicit and explicit discount rates using information from a system of maximum likelihood equations. Testing is done using data for one, five, and fifteen year payment treatments.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19753

Energianövények szántóföldi termelésének optimalizálása
Provedor de dados: 31
Autores: Bedene Szoke,   Eva; Mohamed,   Zsuzsanna.
Az általunk kidolgozott Biomassza Termelési Modell (BTM) lineáris programozáson alapul, és lehetővé teszi, hogy adott mezőgazdasági területre vonatkozóan meghatározzák az optimális vetésszerkezetet, különböző célfüggvények mellett. A különböző célfüggvények esetére vonatkozó optimalizálást a gazdasági környezet, különösen a szabályozó rendszer változása miatt tartottuk szükségesnek, amely adott körülmények között a legkedvezőbb gazdasági haszonnal jár. A döntés fő kérdése, hogy a rendelkezésre álló földterület és erőforrás-kapacitás mellett élelmiszercélú, vagy inkább energetikai célú hasznosítás irányában célszerű-e elmozdulni. --------------------------------------- We have developed a Biomass Production Model (BTM), which is based on linear programming....
Tipo: Journal Article
Palavras-chave: Biomassza-termelés; LP modell; Optimalizálás.; Biomass production; LP model; Optimisation; Land Economics/Use; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/99135

The economic viability of Environmental Management Systems: an application of Analytical Hierarchy Process as a methodological tool to rank trade-offs
Provedor de dados: 31
Autores: Hussain,   Salman; Halpin,   Lauran; McVittie,   Alistair.
Environmental management systems [EMS] are now a well established management tool in the ‘greening’ of industry. There is a large body of literature on methodological procedures and application strategies for implementing EMS. Associated with this proliferation of ‘how to’ manuals has been a limited discussion of why a firm ought to implement a management tool that inevitably affects the bottom line of profitability. We argue that there has been much less by way of methodologically rigorous and academically objective analysis of the motivation for EMS application. Much of this literature is coined in terms of the potential benefits (social, ethical and financial) with arguably an insufficient emphasis on potential real cost burdens. This arises in part...
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/61119

FORECASTING FOR AUSTRALIAN AGRICULTURE
Provedor de dados: 31
Autores: Freebairn,   John W.
The paper provides a review of the objectives of forecasts and of the techniques for generating forecasts in the context of agriculture. Forecasts provide information to facilitate decision making. The techniques are evaluated in terms of assumptions about the processes generating the forecast variables, their relative requirements for time, data and other resources, and their relative forecast accuracy. An evaluation of naive, informal model and econometric model forecasts of Australian agricultural commodity prices and production levels is reported.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/22334

LEAST SQUARES AND ENTROPY AS PENALTY FUNCTIONS
Provedor de dados: 31
Autores: Preckel,   Paul V.
Mathematical measures of entropy as defined by Shannon (1948) and Kullback and Leibler (1951) are currently in vogue in the field  of econometrics, primarily due to the comprehensive work by  Golan, Judge, and Miller (1996). In this paper, an alternative interpretation of the entropy measure as a penalty function over deviations is presented. Using this interpretation, a number of parallels are drawn with least squares estimators, and it is demonstrated that, with a minor modification of the traditional least squares estimator, both approaches may be applied to the general linear model.  The advantages and disadvantages of each approach are discussed, and a philosophical approach to the selection of estimation technique is suggested.
Tipo: Working or Discussion Paper
Palavras-chave: Entropy; Econometrics; Penalty functions; Estimation; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/28625

Incursion Management: An agent based modeling approach
Provedor de dados: 31
Autores: Elliston,   Lisa; Yainshet,   Alasebu; Hinde,   Ray.
An exotic disease incursion management model was developed to estimate the regional economy effects of a potential karnal bunt incursion in south eastern Queensland. By developing an agent based spatial model that integrates the biophysical aspects of the disease incursion with the agricultural production system and the wider regional economy the model can be used to analyse the effectiveness of alternative management strategies for a range of different incursion scenarios. It is also possible to estimate the effectiveness and economic implications of education campaigns to improve the likelihood of detection by farmers in the field or at the silo.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/58406

Surveys: What Does One Need to Know More About Them
Provedor de dados: 31
Autores: Djunaidi,   Harjanto.
The use of surveys as a data collection method gained its popularity in recent years.  However, one needs to be aware of the possibility to make measurement errors due to incorrect surveys design.  The way how a question is asked and the choice the respondents have to choose from shape the sample space which in turns will affect the expected value, variance and co-variance of a random variable.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/35289

USER'S GUIDE TO SEGREG
Provedor de dados: 31
Autores: Stinson,   Thomas F.; Fang,   Kweiwu; Lubov,   Andrea.
SEGREG is a computer program which enables users to perform segmented regression on ordered data sets, given that the boundaries of each segment, or subset point that defines the two best subsets and for the two switching points that define the three best subsets.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1979
URL: http://purl.umn.edu/13330

Context and the VSL: Evidence from a Stated Preference Study in Italy and the Czech Republic
Provedor de dados: 31
Autores: Alberini,   Anna; Scasny,   Milan.
We report on the results of a survey based on conjoint choice experiments that was specifically designed to investigate the effect of context on the Value of a Statistical Life (VSL), an important input into the calculation of the mortality benefits of environmental policies that reduce premature mortality. We define “context” broadly to include i) the cause of death (respiratory illness, cancer, road traffic accident), ii) the beneficiary of the risk reduction (adult v. child), and iii) the mode of provision of the risk reduction (public program v. private good). The survey was conducted following similar protocols in Italy and the Czech Republic. When do not distinguish for the cause of death, child and adult VSL are not significantly different from one...
Tipo: Working or Discussion Paper
Palavras-chave: VSL; Conjoint Choice Experiments; Mortality Risk Reductions; Cost-benefit Analysis; Forced Choice Questions; Research Methods/ Statistical Methods; I18; J17; K32; Q51.
Ano: 2010
URL: http://purl.umn.edu/90952

Review of Applied Health Economics by Jones, Rice, Bago d'Uva, and Balia
Provedor de dados: 31
Autores: Jenkins,   Stephen P.
This article reviews Applied Health Economics by Jones, Rice, Bago d’Uva, and Balia.
Tipo: Article
Palavras-chave: Health economics; Stata texts; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120934

IMPACTS OF CONCENTRATION IN HOG PRODUCTION ON ECONOMIC GROWTH IN RURAL ILLINOIS: AN ECONOMETRIC ANALYSIS
Provedor de dados: 31
Autores: Gomez,   Miguel I.; Zhang,   Liying.
This paper evaluates the impact of increasing concentration of the livestock sector on the economic welfare of rural Illinois. A pooled time-series, cross-sectional model is developed to study the dynamics of structural changes in hog production for the period 1981-1997. The model tests the efficient-market hypothesis on local rural economies. Keywords:  hog production, concentration, economic impacts, rural communities
Tipo: Conference Paper or Presentation
Palavras-chave: Hog production; Concentration; Economic impacts; Rural communities; Community/Rural/Urban Development; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21846

Live and Feeder Cattle Options Markets: Returns, Risk, and Volatility Forecasting
Provedor de dados: 31
Autores: Brittain,   Lee; Garcia,   Philip; Irwin,   Scott H.
The paper examines empirical returns from holding thirty- and ninety-day call and put positions, and the forecasting performance of implied volatility in the live and feeder cattle options markets. In both markets, implied volatility is an upwardly biased and inefficient predictor of realized volatility, with bias most prominent in live cattle. While significant returns exist holding several market positions, most strategies are strongly affected by a drift in futures market prices. However, the returns from selling live cattle puts are persistent, and evidence from straddle returns identifies that the market overprices volatility. This overpricing is consistent with a short-term risk premium whose effect is magnified by extreme changes in market conditions.
Tipo: Conference Paper or Presentation
Palavras-chave: Live cattle; Feeder cattle; Options; Returns; Risk; Volatility forecasting; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Farm Management; Financial Economics; Livestock Production/Industries; Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53038

Defining agricultural and forestry systems in econometric land use models: Some critical reflections
Provedor de dados: 31
Autores: Munchhausen,   Susanne von.
The paper discusses the way pastoral and forestry systems are defined in econometric land use modelling on a national level. It briefly reviews the relevant data bases and modelling tools. Above all, it reflects on the questions asked and information needed in the work of the Ministry of Agriculture and Forestry (MAF) Policy. The paper presents the first results of a working group about the key policy questions related to land use and land use change and the adequacy of the related analyses and modelling approaches.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/96491

Validating Dynamic General Equilibrium Model Forecasts
Provedor de dados: 31
Autores: Li,   NaiChia; Roe,   Terry L.
The maintained hypotheses embodied in structural general equilibrium models calibrated to data have tended to make economists and policy makers insecure regarding their empirical foundation. Advances in dynamic general equilibrium (DGE) theory and its empirical application have exacerbated this insecurity since the forecasts provide by these models brings questions of validation to the forefront. Here, methods are developed to measure the magnitude of bias in DGE forecasts that are simple to implement. We adopted the concordance correlation measure, and introduced a time function method to assess the bias in DGE forecasts. A time-series confidence interval method is also introduced to formally judge the "good" forecasts from the "bad". A calibrated DGE...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21325

From the help desk: Comparing areas under receiver operating characteristic curves from two or more probit or logit models
Provedor de dados: 31
Autores: Cleves,   Mario A.
Occasionally, there is a need to compare the predictive accuracy of several fitted logit (logistic) or probit models by comparing the areas under the corresponding receiver operating characteristic (ROC) curves. Although Stata currently does not have a ready routine for comparing two or more ROC areas generated from these models, this article describes how these comparisons can be performed using Stata’s roccomp command.
Tipo: Journal Article
Palavras-chave: Receiving operating characteristic (ROC) curve; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116016

PARAMETER ESTIMATION AND MEASURES OF FIT IN A GLOBAL, GENERAL EQUILIBRIUM MODEL
Provedor de dados: 31
Autores: Liu,   Jing; Arndt,   Channing; Hertel,   Thomas W.
Computable General Equilibrium (CGE) models have been widely used for quantitative analysis of global economic issues. However, CGE models are frequently criticized for resting on weak empirical foundations. This paper builds on recent work in macro-econometric estimation, developing an approach to parameter estimation for a widely employed global CGE model, the Global Trade Analysis Project (GTAP) model. An approximate likelihood function is developed and the set of optimum elasticity values is obtained by maximizing this approximate likelihood function in the context of a back casting exercise.  In addition, two statistical tests are performed. The first of these tests compares the standard GTAP elasticity vector with the estimated trade elasticity...
Tipo: Working or Discussion Paper
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/28687

Preliminary Evaluation of Alternative Models for Banana Production Forecasting in the Windward Islands
Provedor de dados: 31
Autores: Thomas-Louisy,   Luvette; Alexander-Louis,   Theresa.
Tipo: Journal Article
Palavras-chave: Banana Production; Production Forecasting; Banana in the Windward Islands; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/45593

Nonfarm Employment and Poverty Reduction in Rural Ghana: A Propensity-Score Matching Analysis
Provedor de dados: 31
Autores: Owusu,   Victor; Abdulai,   Awudu.
This article investigates the impact of nonfarm employment on farm household income and way out of poverty, using farm household data from Brong-Ahafo region of Ghana. A propensity score matching model is used to evaluate the impact participating in both wage and self-employment. Separate estimates are also provided for males and females. The results from the study show that nonfarm employment has a positive and robust effect on farm household income and a negative and significant effect on the likelihood of being poor. Self-employment was found to have much higher impacts than wage employment, reflecting the fact that most employment opportunities in the rural areas are in the former sector.
Tipo: Conference Paper or Presentation
Palavras-chave: Non-farm employment; Poverty; Matching; Community/Rural/Urban Development; Consumer/Household Economics; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/51363

Estimating productivity of water at different spatial scales using simulation modeling
Provedor de dados: 31
Autores: Droogers,   Peter; Kite,   Geoff.
A clear understanding of the current water balance is required to explore options for water saving measures. However, measurement of all the terms in the water balance is infeasible in terms of spatial and temporal scale, but hydrological simulation models can fill the gap between measured and required data. For a basin in Western Turkey, simulation modeling at three different scales, field, irrigation scheme and basin scale, was performed to obtain all terms of the water balance. These water balance numbers were used to calculate the Productivity of Water at the three spatial levels distinguished to assess the performance of the systems.
Tipo: Report
Palavras-chave: Water resources; Productivity; Simulation models; Water scarcity; Water supply; Water balance; Performance indexes; Indicators; River basins; Cropping systems; Crop yield; Cotton; Hydrology; Economic analysis; Agribusiness; Agricultural Finance; Crop Production/Industries; Environmental Economics and Policy; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/44568

Stata tip 3: How to be assertive
Provedor de dados: 31
Autores: Gould,   William.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116203

Review of A Gentle Introduction to Stata by Acock
Provedor de dados: 31
Autores: Mulcahy,   Michael.
This article reviews A Gentle Introduction to Stata by Acock.
Tipo: Journal Article
Palavras-chave: Introductory statistics; Social science; Teaching Stata; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117591

SHADOW PRICE IMPLICATIONS OF SECOND DEGREE STOCHASTIC DOMINANCE EFFICIENCY
Provedor de dados: 31
Autores: McCamley,   Francis P.; Rudel,   Richard K.
Second degree stochastic dominance (SSD) can be, but seldom is explicitly, applied to problems having continuous variables.  A model is presented which, for any SSD efficient solution, facilitates exploration of the set of SSD consistent shadow prices.  The model is tested by applying it to a problem described by Hazell.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/36370

CONSISTENT ESTIMATION OF LONGITUDINAL CENSORED DEMAND SYSTEMS
Provedor de dados: 31
Autores: Meyerhoefer,   Chad D.; Ranney,   Christine K.; Sahn,   David E.
In this paper we derive a joint continuous/censored demand system suitable for the analysis of commodity demand relationships using panel data.  Unobserved heterogeneity is controlled for using a correlated random effects specification and a Generalized Method of Moments framework used to estimate the model in two stages.  While relatively small differences in elasticity estimates are found between a flexible specification and one that restricts the relationship between the random effect and budget shares to be time invariant, larger differences are observed between the most flexible random effects model and a pooled cross sectional estimator.  The results suggest the limited ability of such estimators to control for preference heterogeneity and unit value...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19992

World Wheat Policy Simulation Model: Description and Computer Program Documentation
Provedor de dados: 31
Autores: Benirschka,   Martin; Koo,   Won W.
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/23333

Profile likelihood for estimation and confidence intervals
Provedor de dados: 31
Autores: Royston,   Patrick.
Normal-based confidence intervals for a parameter of interest are inaccurate when the sampling distribution of the estimate is nonnormal. The technique known as profile likelihood can produce confidence intervals with better coverage. It may be used when the model includes only the variable of interest or several other variables in addition. Profile-likelihood confidence intervals are particularly useful in nonlinear models. The command pllf computes and plots the maximum likelihood estimate and profile likelihood–based confidence interval for one parameter in a wide variety of regression models.
Tipo: Article
Palavras-chave: Pllf; Profile likelihood; Confidence interval; Nonnormality; Nonlinear model; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119282

EXPERT OPINION VERSUS TRANSACTION EVIDENCE: USING THE REILLY INDEX TO MEASURE OPEN SPACE PREMIUMS IN THE URBAN-RURAL FRINGE
Provedor de dados: 31
Autores: Cotteleer,   Geerte; Stobbe,   Tracy; van Kooten,   G. Cornelis.
Due to economic and population growth farmland and to a lesser extend other undeveloped areas are under pressure in the urban-rural fringe in British Columbia, Canada. The objectives of this paper are to determine if residential property values near Victoria, BC include open-space premiums for farmland or parks or both, and to determine if using assessed values instead of market prices of the property result in the same findings. We estimate a SUR (Seemingly Unrelated Regression) model with two hedonic pricing equations, one with actual market values as the dependent variable and one with assessed property values, and compare the resulting estimates of shadow prices for open space amenities. Furthermore, we take account of spatial autocorrelation and...
Tipo: Conference Paper or Presentation
Palavras-chave: Hedonic pricing models; Assessed property values; Value of open space; Geographical Information System; Reilly; GMM; Spatial dependence; Community/Rural/Urban Development; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6705

The Impacts of Ethanol on the US Catfish Farm Sector
Provedor de dados: 31
Autores: Zheng,   Hualu; Muhammad,   Andrew; Herndon,   Cary W., Jr.
In this study, we estimated catfish feed and farm price reduced form equations. Of particular importance was the impact of the recent increase in grain prices induced by ethanol production on feed cost and farm prices. This relationship was examined using an autoregressive distributed lag (ARDL) model. Results show that a 1% increase in corn prices caused a 0.134% and 0.263% increase in feed prices in the short- and long-run, respectively. Catfish farm prices increased by 0.106% (short-run) and 0.211% (long-run) given a 1% increase in feed prices.  Between 2004 and 2008, corn prices increased from $2 to $6 per bushels. Taheripour and Tyner (2008) state that of the total increase, 25% was due to US ethanol subsidies and 75% was due to the increase in the...
Tipo: Conference Paper or Presentation
Palavras-chave: Catfish; Price; Catfish feed; Ethanol; Autoregressive distributed lag model; ARDL; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/46248

Debugging Mathematical Programming Models: Principles and Practical Strategies
Provedor de dados: 31
Autores: Pannell,   David J.; Kingwell,   Ross S.; Schilizzi,   Steven.
Bugs are an unavoidable aspect of mathematical programming (MP) modelling. In this paper we discuss the prevention and diagnosis of bugs in MP models. The topic is rarely addressed in the literature but is crucial to the success of modelling projects, especially for large models. We argue that finding a bug and understanding unexpected results (whether or not due to a bug) are very closely related activities. We identify different types of bugs and suggest practical strategies for dealing with each. Adopting procedures for prevention of bugs is essential, especially for large models. We outline the prevention strategies we have adopted and found successful for the MIDAS and MUDAS models.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/12306

HETEROSKEDASTICITY IN CROP YIELD MODELS
Provedor de dados: 31
Autores: Yang,   Seung-Ryong; Koo,   Won W.; Wilson,   William W.
This study examines three alternative models of correcting for heteroskedasticity in wheat yield: the time trend variance, the GARCH, and an econometric model that includes the potential sources of heteroskedasticity. Nonnested test results suggest that modeling the sources of heteroskedasticity is the preferred procedure. Including potential sources of heteroskedasticity as explanatory variables removed the heteroskedasticity in the sample wheat yields. The results also suggest that the GARCH specification is a promising model of correcting for heteroskedasticity when the sources cannot be identified. The time trend variance model alone may misspecify the true variance structure.
Tipo: Journal Article
Palavras-chave: Production Economics; Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/30738

OWNERSHIP STRUCTURE AND ENDOGENOUS QUALITY CHOICE
Provedor de dados: 31
Autores: Hoffmann,   Ruben.
This paper examines how ownership structure affects quality choice and the subsequent equilibrium outcomes within a duopoly framework. Specifically, investor owned firms and cooperatives are analyzed in a closed market setting where these firms may coexist in the economy. The conditions under which ownership structure matters are identified. We conclude that ownership structure matters if the cost of quality at farm level is fixed or if there is a variable cost exhibiting non-constant returns to scale. Two farm level cost functions, a fixed cost function that is increasing and convex in quality, and a variable cost function that is increasing and convex in quantity are analyzed. The two processing firms play a two-stage game where each of the firms...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19869

Analysis on the Development Trend of Oasis Subject and Its Countermeasures
Provedor de dados: 31
Autores: Wang,   Kaiyong; Yang,   Le; Pang,   Wei; Pan,   Xudong; Zhang,   Fenghua.
The research status, development and trend of oasis subject were analyzed, and related countermeasures to develop oasis subject were put forward.
Tipo: Thesis or Dissertation
Palavras-chave: Oasis subject; Subject; Development; Construction; China; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53602

ESTIMATING LINEAR PROBABILITY FUNCTIONS: A COMPARISON OF APPROACHES
Provedor de dados: 31
Autores: Debertin,   David L.; Pagoulatos,   Angelos; Smith,   Eldon D.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/29495

Efficiency Analysis of Rural Hospitals: Parametric and Semi-parametric Approaches
Provedor de dados: 31
Autores: Nedelea,   I. Cristian; Fannin,   James Matthew.
This paper examined cost efficiency differences between rural hospitals participating in the Critical Access Hospital (CAH) Program and a group of non-converting, prospectively paid rural hospitals using both a two-stage semi-parametric approach as well as stochastic frontier analysis (SFA).  CAHs receive Medicare cost-based reimbursement, in contrast with the rest of the hospitals reimbursed under Medicare prospective payment system (PPS).  However, cost-based reimbursement has been associated with inefficiency in hospital operations and, consequently, concerns have been raised about the efficiency of CAHs.  Results showed a positive and significant effect of CAH status on cost inefficiency under both model specifications suggesting that CAHs were less...
Tipo: Presentation
Palavras-chave: Rural hospitals; Efficiency; SFA; Two-stage approach; Community/Rural/Urban Development; Health Economics and Policy; Production Economics; Productivity Analysis; Public Economics; Research Methods/ Statistical Methods; I18.
Ano: 2012
URL: http://purl.umn.edu/119725

Stata tip 6: Inserting awkward characters in the plot
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116218

A Cost Approach to Economic Analysis under Production Uncertainty
Provedor de dados: 31
Autores: Chavas,   Jean-Paul.
This paper explores the economics of input decision by a firm facing production uncertainty. It relies on a state-contingent approach to production uncertainty. First, the paper develops a methodology to specify and estimate cost-minimizing input decisions under a state-contingent technology. Second, the analysis is applied to time series data on US agriculture. It finds strong empirical evidence that, in the analysis of input choices, expected output alone does not provide an appropriate representation of production uncertainty. The results provide empirical support for an output-cubical technology. This indicates that an ex post analysis of stochastic technology (as commonly found in previous research) appears appropriate. The analysis also provides...
Tipo: Conference Paper or Presentation
Palavras-chave: Production uncertainty; State contingent; Cost; Cubical technology.; Research Methods/ Statistical Methods; C3; D21; D8.
Ano: 2006
URL: http://purl.umn.edu/21081

Technical Guide to C-SIDE (Software for Intake Distribution Estimation)
Provedor de dados: 31
Autores: Dodd,   Kevin W.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/18653

Stata tip 65: Beware the backstabbing backslash
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122606

An Ex post Evaluation of Economic Impacts of Foot-and-Mouth Disease on Taiwan Using a Dynamic Computable General Equilibrium Model
Provedor de dados: 31
Autores: Hsu,   Shih-Hsun; Lee,   Duu-Hwa; Chang,   Ching-Cheng; Lin,   Hsing-Chun; Yang,   Tzu-Chiang.
The outbreak of foot-and-mouth disease (FMD) in 1997 has resulted in significant losses to Taiwan's hog industry which was the most important industry in Taiwan's agricultural sector at that time.  Hog farmers have suffered great losses due to the cost of slaughtering infected hogs and reduced revenues in the hog market.  Furthermore, all pork exports are prohibited according to the Office International des Epizooties (OIE) regulation.  There have been a number of ex ante studies that have quantified the potential impacts of FMD on Taiwan's economy (e.g., Tsai 1999, Lin and Hsu 1999).  That is, the potential impact assessment was done when the event of FMD just broke out. This article provides an ex post economy-wide assessment of the FMD impacts on...
Tipo: Conference Paper or Presentation
Palavras-chave: Foot-and-mouth disease; Ex post simulation; Computable General Equilibrium (CGE); Research Methods/ Statistical Methods; C68; BE27; BL16.
Ano: 2005
URL: http://purl.umn.edu/19545

Recovery of Incomplete Data of Statistical Livestock Number Applying an Entropy Approach
Provedor de dados: 31
Autores: Xavier,   Antonio; Martins,   Maria de Belem Costa Freitas; Fragoso,   Rui Manuel de Sousa.
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/115790

Robust standard errors for panel regressions with cross–sectional dependence
Provedor de dados: 31
Autores: Hoechle,   Daniel.
I present a new Stata program, xtscc, that estimates pooled ordinary least-squares/weighted least-squares regression and fixed-effects (within) regression models with Driscoll and Kraay (Review of Economics and Statistics 80: 549–560) standard errors. By running Monte Carlo simulations, I compare the finite-sample properties of the cross-sectional dependence–consistent Driscoll–Kraay estimator with the properties of other, more commonly used covariance matrix estimators that do not account for cross-sectional dependence. The results indicate that Driscoll–Kraay standard errors are well calibrated when cross-sectional dependence is present. However, erroneously ignoring cross-sectional correlation in the estimation of panel models can lead to severely...
Tipo: Article
Palavras-chave: Xtscc; Robust standard errors; Nonparametric covariance estimation; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119278

Approximating Bayesian Posteriors using Multivariate Gaussian  Quadrature
Provedor de dados: 31
Autores: Cranfield,   John A.L.; Preckel,   Paul V.; Liu,   Songquan.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/35791

Highly Pathogenic Avian Influenza Impacts on Japan’s Import Demand for Cooked and Uncooked Poultry, Beef, Pork, and Other Meats
Provedor de dados: 31
Autores: Taha,   Fawzi A.; Hahn,   William F.
First developed meat import demand system, disaggegating poultry meat into two products, cooked poultry (safe)and uncooked poultry meat (less safe). The model includes, beef, pork, and other meats as well.
Tipo: Conference Paper or Presentation
Palavras-chave: CBS model; Highly Pathogenic Avian Influenza (HPAI); BSE; Meat import demand system; Cooked poultry; Uncooked poultry; Beef; Pork; Other meats; Structural change; Japan; Agricultural and Food Policy; Health Economics and Policy; International Relations/Trade; Livestock Production/Industries; Research Methods/ Statistical Methods; Q17; Q18; Q21.
Ano: 2011
URL: http://purl.umn.edu/103853

The robust variance estimator for two-stage models
Provedor de dados: 31
Autores: Hardin,   James W.
This article discusses estimates of variance for two-stage models. We present the sandwich estimate of variance as an alternative to the Murphy–Topel estimate. The sandwich estimator has a simple formula that is similar to the formula for the Murphy–Topel estimator, and the two estimators are asymptotically equal when the assumed model distributions are true. The advantages of the sandwich estimate of variance are that it may be calculated for the complete parameter vector, and that it requires estimating equations instead of fully specified log likelihoods.
Tipo: Journal Article
Palavras-chave: Robust variance estimator; Murphy–Topel estimator; Two-stage estimation; Estimating equation; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116000

SPLIT-SAMPLE TESTS OF "DON'T KNOW" AND "INDIFFERENT" RESPONSES IN AN ATTRIBUTE BASED CHOICE MODEL
Provedor de dados: 31
Autores: Fenichel,   Eli P.; Lupi,   Frank; Hoehn,   John P.; Kaplowitz,   Michael D.
Tipo: Conference Paper or Presentation
Palavras-chave: Stated preference; Contingent valuation; No opinion; Internet survey; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21070

Review of Statistical Evaluation of Measurement Errors by Dunn
Provedor de dados: 31
Autores: Cox,   Nicholas J.
This article reviews Statistical Evaluation of Measurement Errors by Dunn.
Tipo: Journal Article
Palavras-chave: Measurement errors; Linear models; Mixed models; Gllamm; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116280

Study on Ecological Compensation System and Land Desertification Control
Provedor de dados: 31
Autores: Lu,   Zhixiang; Gao,   Bingtao.
The problems of desertification control in China are analyzed from the perspective of ecological compensation. Firstly, there is no guarantee of ecological compensation system in desertification control. On the basis of knowing land desertification connotation, the western region is taken as an example to analyze the serious consequence brought by land desertification, besides, the connotation and importance of ecological compensation are summarized, as well as the views related to resolve the benefit compensation of ecological environment in the world are introduced. The ecological compensation is mainly based on the compensation theory of public goods and the value theory of ecological environment, besides, it emphasizes using tax to realize...
Tipo: Thesis or Dissertation
Palavras-chave: Ecological compensation system; Land desertification; Creative Conception; China; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/54032

Price Setting in Food SMEs: Which Role for Marketing Capability? An Empirical Analysis in Italy
Provedor de dados: 31
Autores: Banterle,   Alessandro; Carraresi,   Laura; Cavaliere,   Alessia.
Small and medium-sized enterprises (SMEs) are fighting for survival due to globalization, growing competition with big retailers, and strategies adopted by large industrial companies. Difficulties in pricing are also revealed in the literature. Therefore, appropriate activity is needed to be more a price maker than a taker, and to reach a better market power. On the other hand, market opportunities for SMEs are related to demand evolution toward food quality and traditional food products. To profit by such opportunities, SMEs need to focus on consumer requirements, by differentiating their products. In this way, firms could apply a premium price that justifies the peculiar value of the product, and that the consumer should be willing to pay. Nonetheless,...
Tipo: Presentation
Palavras-chave: Traditional food products; Price setting; Marketing capability; Ordinal regression model; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods; L25; L66; M31; Q13.
Ano: 2011
URL: http://purl.umn.edu/122000

OFF-FARM WORK PARTICIPATION, OFF-FARM LABOR SUPPLY AND ON-FARM LABOR DEMAND OF U.S. FARM OPERATORS
Provedor de dados: 31
Autores: Huffman,   Wallace E.; El-Osta,   Hisham S.
The paper presents econometric evidence on off-farm work participation, off-farm hours of work, and on-farm hours of work for U.S. farm operators using a national sample of farmers for the USDA's 1991 Farm Costs and Return Survey.
Tipo: Conference Paper or Presentation
Palavras-chave: Farm Management; Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20846

Developmental Upsurge of Leisure Agriculture
Provedor de dados: 31
Autores: Zhong,   Chunyan; Wang,   Jinghua.
This paper expounds the developmental status and characteristics of leisure agriculture, as well as the inevitability of the developmental upsurge. It also analyzes the problems brought by over-heated development of leisure agriculture. And the countermeasures adopted by government and related sections are put forward from the aspects of developmental ideas, plan, management, construction of infrastructure and cultivation of talents.
Tipo: Thesis or Dissertation
Palavras-chave: Leisure agriculture of China; Developmental upsurge; Problem; Countermeasures and proposals; Community/Rural/Urban Development; Environmental Economics and Policy; Marketing; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53511

Generalized Estimation Methods for Non-i.i.d. Binary Data: An Application to Dichotomous Choice Contingent Valuation
Provedor de dados: 31
Autores: Kim,   Sooil; Haab,   Timothy C.
We challenge the assumption of i.i.d random utility across alternatives embedded in typical applications of logit models to dichotomous choice contingent valuation data.  Using a Gumbel mixed distribution which nests a number of traditional models, we show that the logistic distribution is not a suitable distribution for contingent valuation analysis.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19138

Welfare distribution and poverty in Uganda, 1992 to 2000
Provedor de dados: 31
Autores: Okidi,   John A.; Okwi,   Paul O.; Ddumba-Ssentamu,   John.
This study covers a period of far-reaching economic reform policies and programs in Uganda. Measures of inequality and stochastic dominance analysis are applied to a series of regionally representatives national household surveys data to shed light on the patterns of inter-temporal changes in levels and distribution of welfare in Uganda. Stochastic dominance analysis of welfare distribution reveals that Ugandan households were better off in 2000 and 1997 than in 1992 irrespective of the choice of a poverty line. Using a sub-regional panel data set that was constructed on the basis of rural/urban categorization we estimate elasticities of poverty with respect to growth to illustrate that deliberate policies focusing on welfare distribution would...
Tipo: Report
Palavras-chave: Uganda; Inequality; Stochastic dominance; Poverty reduction; Poverty elasticities; Okidi; EPRC; Consumer/Household Economics; Financial Economics; Institutional and Behavioral Economics; Labor and Human Capital; Livestock Production/Industries; Political Economy; Public Economics; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/93853

Importing Federal Reserve economic data
Provedor de dados: 31
Autores: Drukker,   David M.
This note describes freduse, which imports datasets from the Federal Reserve economic data (FRED®) repository.
Tipo: Journal Article
Palavras-chave: Freduse; Federal Reserve economic data repository; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117588

Dynamic oligopoly: estimation and tests of market structure
Provedor de dados: 31
Autores: Karp,   Larry S.; Perloff,   Jeffrey M.
A linear-quadratic dynamic oligopoly model is developed and applied to the world coffee export market. The model nests various market structures using either open-loop or feedback strategies. The theoretical properties of this model are described. For given observed behavior, the assumption of feedback strategies implies a less competitive market structure than open-loop strategies.
Tipo: Working or Discussion Paper
Palavras-chave: Industrial Organization; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/6105

Economic Growth in the Philippines: A Spatial Econometrics Analysis at the Provincial Level, 1991 – 2000.
Provedor de dados: 31
Autores: Pede,   Valerien O.; Huelgas,   Zenaida M.; Villano,   Lorena; Garcia,   Cornelia; McKinley,   Justin D.; Mohanty,   Samarendu.
Investigating the determinants of economic growth remains a long research tradition in the economic growth literature. Most studies in this literature have tried to link economic growth and different economic factors using either neoclassical growth theories or endogenous growth approaches. These studies apply these growth theories to identify the factors responsible for the observed differences/disparities between regions or countries. While early studies focused on cross-country analyses, the recent most studies consider regions or sub-national entities as unit of analysis. This has raised the question of whether theories developed for cross-country analysis could be automatically applied for regional or sub-national analysis. Given the profound...
Tipo: Conference Paper or Presentation
Palavras-chave: Community/Rural/Urban Development; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103651

NON-PARAMETRIC AND SEMI-PARAMETRIC TECHNIQUES FOR MODELING AND SIMULATING CORRELATED, NON-NORMAL PRICE AND YIELD DISTRIBUTIONS: APPLICATIONS TO RISK ANALYSIS IN KANSAS AGRICULTURE
Provedor de dados: 31
Autores: Featherstone,   Allen M.; Kastens,   Terry L.
Parametric, non-parametric, and semi-parametric approaches are commonly used for modeling correlated distributions. Semi-parametric and non-parametric approaches are used to examine the risk situation for Kansas agriculture. Results from the model indicate that 2000 will be another difficult year for Kansas farmers, although crop income will increase slightly from 1999. However, unless another supplemental infusion of government payments occurs, crop income is expected to be the lowest since 1992.
Tipo: Journal Article
Palavras-chave: Correlated distributions; Non-parametric modeling; Semi-parametric modeling; Kansas agriculture; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/15491

Mixed Unit Roots and Deterministic Trends in Noncausality Tests
Provedor de dados: 31
Autores: Ran,   Tao; Zapata,   Hector O.
Using Japanese economic data and a Monte Carlo simulation, this study analyzes the consequences of ignoring deterministic trends in mixed unit-root data for Granger noncausality tests. Results from an augmented VAR suggest over-rejection in certain empirically relevant cases at various sample sizes.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6745

Introducing site quality into recreation demand functions
Provedor de dados: 31
Autores: Hanemann,   W. Michael.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1984
URL: http://purl.umn.edu/6187

Weather, Technology, and Corn and Soybean Yields in the U.S. Corn Belt
Provedor de dados: 31
Autores: Tannura,   Michael A.; Irwin,   Scott H.; Good,   Darrel L.
The purpose of this study was to investigate the relationship between weather, technology, and corn and soybean yields in the U.S. Corn Belt. Corn and soybean yields, monthly temperature, and monthly precipitation observations were collected over 1960 through 2006 for Illinois, Indiana, and Iowa. Multiple regression models were developed based on specifications found in studies by Thompson (1962 1963 1969 1970 1985 1986 1988). Estimated models explained at least 94% and 89% of the variation in corn and soybean yields for each state, respectively. Analysis of the regression results showed that corn yields were particularly affected by technology, the magnitude of precipitation during June and July, and the magnitude of temperatures during July and August....
Tipo: Report
Palavras-chave: Agricultural Finance; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/37501

A SYSTEMS APPROACH FOR EVALUATING ON-FARM SITE-SPECIFIC MANAGEMENT TRIALS: A CASE STUDY WITH VARIABLE RATE MANURE AND CROP QUALITY RESPONSE TO INPUTS
Provedor de dados: 31
Autores: Lambert,   Dayton M.; Lowenberg-DeBoer,   James; Malzer,   Gary L.
Site-specific application of manure has the potential to improve crop production and environmental quality. If manure is applied where it is needed, in the quantity required by the crop, over application, with attendant runoff and leaching problems can be reduced. To implement this approach growers need site-specific crop response information. Increasing availability of site-specific yield information offers a way to estimate such crop responses. The objective of this study is to develop a methodology for estimating site-specific response of corn and soybeans to manure given soil test information, and to use that methodology to analyze an on-farm manure management trial conducted near Sleepy Eye, Minnesota. Both quantity and quality of the crop is...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20091

Speaking Stata: On numbers and strings
Provedor de dados: 31
Autores: Cox,   Nicholas J.
The great divide among data types in Stata is between numeric and string variables. Most of the time, which kind you want to use for particular variables is clear and unproblematic, but surprisingly often, users face difficulties in making the right decision or need to convert variables from one kind to another. The main problems that may arise and their possible solutions are surveyed with reference both to official Stata and to user-written programs.
Tipo: Journal Article
Palavras-chave: Binary variables; Categorical variables; Data Editor; Dates; Decode; Destring; Encode; Identifiers; Missing values; Numeric variables; Spreadsheets; String functions; String variables; Tostring; Value labels; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116018

GLOBAL OPTIMIZATION METHODS
Provedor de dados: 31
Autores: Hamm,   Lonnie; Brorsen,   B. Wade.
Training a neural network is a difficult optimization problem because of numerous local minimums.  Many global search algorithms have been used to train neural networks.  However, local search algorithms are more efficient with computational resources, and therefore numerous random restarts with a local algorithm may be more effective than a global algorithm.  This study uses Monte-Carlo simulations to determine the relative efficiency of a local search algorithm to 9 stochastic global algorithms.  The computational requirements of the global algorithms are several times higher than the local algorithm and there is little gain in using the global algorithms to train neural networks.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/36631

ADULT EQUIVALENT SCALES REVISITED
Provedor de dados: 31
Autores: Demoussis,   Michael; Mihalopoulos,   Vassilis.
Use of the Tobit model for estimation of adult equivalent scale (AES) parameters and expenditure equations presupposes that zero observations represent exclusively corner solutions.  This paper tests for the underlying causes of zero observations and estimates accordingly the AES parameters, the household size in adult equivalents and the resulting expenditure equations and consumption profiles.  The empirical application concerns Greek household "soft" and "hard" cheese consumption.  The statistical results indicate that for the examined cheese categories the "double hurdle participation" model adjusted for non-normality and heteroskedasticity is the appropriate model for the estimation of AES parameters and expenditure equations.
Tipo: Journal Article
Palavras-chave: Adult equivalent scales; Double-hurdle models; Soft and hard cheese; Greece; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/15291

Review of Regression Methods in Biostatistics: Linear, Logistic, Survival, and Repeated Measures Models by Vittinghoff, Glidden, Shiboski, and McCulloch
Provedor de dados: 31
Autores: Lemeshow,   Stanley; Moeschberger,   Melvin L.
This article reviews Regression Methods in Biostatistics: Linear, Logistic, Survival, and Repeated Measures Models by Vittinghoff et al.
Tipo: Journal Article
Palavras-chave: Linear regression; Logistic regression; Survival analysis; Repeated measures; Generalized linear models; Complex surveys; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117518

More than Mean Effects: Modeling the Effect of Climate on the Higher Order Moments of Crop Yields
Provedor de dados: 31
Autores: Tack,   Jesse B.; Harri,   Ardian; Coble,   Keith H.
The objective of this article is to propose the use of moment functions and maximum entropy techniques as a flexible way to estimate conditional crop yield distributions. We present a moment based model that extends previous approaches in several dimensions, and can be easily estimated using standard econometric estimators. Upon identification of the yield moments under a variety of climate and irrigation regimes, we utilize maximum entropy techniques to analyze the distributional impacts from switching regimes. We consider the case of Arkansas, Mississippi, and Texas upland cotton to demonstrate how climate and irrigation affect the shape of the yield distribution, and compare our findings to other moment based approaches. We empirically illustrate...
Tipo: Presentation
Palavras-chave: Risk; Climate change; Moments; Entropy; Yield; Cotton; Crop Production/Industries; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2012
URL: http://purl.umn.edu/123330

Speaking Stata: Spineplots and their kin
Provedor de dados: 31
Autores: Cox,   Nicholas J.
The term spineplot has been applied over the last decade or so to a type of bar chart used particularly for showing frequencies, proportions, or percentages of two cross-classified categorical variables. The principle is that the areas of rectangular tiles are proportional to the frequencies in the cells of a contingency table. Often both coarse and fine structure are easy to see, including departures from independence. The main idea has, in fact, been rediscovered repeatedly over at least the last 130 years. In its most general form, it has been widely publicized under the name mosaic plots. This column introduces, discusses, and exemplifies a Stata implementation of spineplots. It is noted that a restriction to two variables is more apparent than real,...
Tipo: Article
Palavras-chave: Spineplots; Mosaic plots; Bar charts; Graphics; Categorical data; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120931

CONTINGENT VALUATION FOCUS GROUPS: INSIGHTS FROM ETHNOGRAPHIC INTERVIEW TECHNIQUES
Provedor de dados: 31
Autores: Johnston,   Robert J.; Weaver,   Thomas F.; Smith,   Lynn A.; Swallow,   Stephen K.
Despite the many important uses (and potential abuses) of focus groups in survey design, the CV literature presents few guidelines to aid moderators in their interaction with focus group participants.  This paper draws on the theory and practice of ethnographic interviewing to introduce general guidelines that can improve focus groups as an aid to CV research.  The proposed guidelines illustrate types of questions that should reduce speculation and moderator-introduced bias in focus group responses, and improve the correspondence between focus group responses and actual behavior.  The paper illustrates these ethnographic guidelines through a CV application concerning watershed resources.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/31460

Methodische  Ansätze  zur  Quantifizierung  der  Arbeitsplatzeffekte  von  Maßnahmen  zur   ländlichen  Entwicklung
Provedor de dados: 31
Autores: Margarian,   Anne.
Zusammenfassung: In der vorliegenden Arbeit werden mögliche methodische Ansätze zur Beurteilung von Arbeitsplatzeffekten von Fördermaßnahmen für den ländlichen Raum und insbesondere der Integrierten Ländlichen Entwicklung (ILE) vorgestellt und diskutiert. Aufgenommen wurden auch Methoden, deren Eignung für diese spezifischen Bewertungen verneint wird. Aus diesem Grund ist die vorliegende Arbeit nicht nur mit Blick auf die Bewertung der ILE zu lesen, sondern kann auch über mögliche Herangehensweisen an die Bewertung anderer Maßnahmen zur Entwicklung des ländlichen Raumes informieren. Die Diskussion der verschiedenen Methoden zeigt, dass es notwendig ist, die einer Wirkung zugrunde liegenden Zusammenhänge genau zu kennen, um die tatsächliche Wirkung einer...
Tipo: Report
Palavras-chave: Evaluation; Wirkungsanalyse; Politik für den ländlichen Raum; Ar­beitsplatzeffekte; Evaluation; Causal analysis; Rural development measures; Employment; Agricultural and Food Policy; Community/Rural/Urban Development; Research Methods/ Statistical Methods; C18; C54; R15; R58.
Ano: 2010
URL: http://purl.umn.edu/102642

Towards a Measurement of Free Riding within Private Collective Action Organizations
Provedor de dados: 31
Autores: Olson,   Frayne E.; Cook,   Michael L.
The objective of this study is to determine if there is a dominant free riding activity which can be identified and used as the basis for measuring free riding, or if multiple free riding actions and/or behaviors coexist within large collective action organizations.   The study uses a confirmatory factor analysis model to evaluate member level survey data from a large agricultural marketing cooperative.
Tipo: Conference Paper or Presentation
Palavras-chave: Institutional and Behavioral Economics; Marketing; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6025

METHODS WE HAVE USED
Provedor de dados: 31
Autores: Mauch,   Arthur.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1951
URL: http://purl.umn.edu/17368

ESTIMATION OF ACTUAL RESPONSE COEFFICIENTS IN THE HILDRETH-HOUCK RANDOM COEFFICIENT MODEL
Provedor de dados: 31
Autores: Griffiths,   William E.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1971
URL: http://purl.umn.edu/14275

Contemporary Issues in Estimating Yield Distributions
Provedor de dados: 31
Autores: Pujula,   Aude Liliana; Maradiaga,   David Isaias; Dicks,   Michael R.
In the research area of crop yield density estimation and in particular in risk analysis, little emphasis has been given to the appropriateness of transformation methods (e.g., removing a linear trend) and how such transformations impact the reliability of the empirical distribution functions and the resulting probability estimates. Similarly, there is little consensus on the impact of environmental variables (e.g., rainfall and temperature) on empirical distributions of yields. Using historical county corn yield data for Arkansas and Louisiana and nonparametric methods, this empirical analysis shed light on the importance of data transformation in crop risk analysis. Results demonstrate that inappropriate data treatment can lead to misestimation of...
Tipo: Conference Paper or Presentation
Palavras-chave: Probability Density Estimation; Nonparametric; Kernel; Nonstationary; Unit Roots; Data Transformations; Corn Yields; Weather; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/56527

VLIT NODE Sensor Technology and Prefarm
Provedor de dados: 31
Autores: Charvat,   Karel; Musil,   Marek; Krivanek,   Zbynek.
Precision farming systems are based on a detailed monitoring of information and data that are necessary for successful decision-making in crop production. The system is designed for data collection from several resources. In past years an extensive research and development work has been done in the field of wireless sensor networks (WSN) in the world. When a wireless sensor network (WSN) is used for agricultural purposes, it has to provide first of all a long-reach signal. The present paper describes new long distance RFID based technology implementation - VLIT NODE.
Tipo: Journal Article
Palavras-chave: Wireless Sensor Network; Precision Agriculture; RFID.; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; GA; IN.
Ano: 2010
URL: http://purl.umn.edu/96875

How to do xtabond2: An introduction to difference and system GMM in Stata
Provedor de dados: 31
Autores: Roodman,   David.
The difference and system generalized method-of-moments estimators, developed by Holtz-Eakin, Newey, and Rosen (1988, Econometrica 56: 1371–1395); Arellano and Bond (1991, Review of Economic Studies 58: 277–297); Arellano and Bover (1995, Journal of Econometrics 68: 29–51); and Blundell and Bond (1998, Journal of Econometrics 87: 115–143), are increasingly popular. Both are general estimators designed for situations with “small T, large N” panels, meaning few time periods and many individuals; independent variables that are not strictly exogenous, meaning they are correlated with past and possibly current realizations of the error; fixed effects; and heteroskedasticity and autocorrelation within individuals. This pedagogic article first introduces linear...
Tipo: Article
Palavras-chave: Xtabond2; Generalized method of moments; GMM; Arellano–Bond test; Abar; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122704

Cotton Futures Dynamics: Structural Change, Index Traders and the Returns to Storage
Provedor de dados: 31
Autores: Power,   Gabriel J.; Robinson,   John R.C.
The commodity bull cycle of 2006-2008 and subsequent dramatic price decline have been a source of hardship for traditional commodity market participants such as producers and merchant/shippers. The usefulness of futures markets has been called into question, especially given that some market movements did not appear to be justified by economic fundamentals. An emerging research literature examines the possible influence of futures traders, and particularly the non-traditional Index Traders, on the well-functioning of futures markets and underlying commodity markets. Cotton is a relatively under-studied commodity that is of particular importance for producers in the South and Southwest. To this end, this paper asks the following questions: (1) What role...
Tipo: Conference Paper or Presentation
Palavras-chave: Cotton; Futures markets; Theory of storage; Convenience yield; Index Traders; Agribusiness; Agricultural Finance; Crop Production/Industries; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53044

Designing Frameworks to Deliver Unknown Information to Support MBIs
Provedor de dados: 31
Autores: Eigenraam,   Mark; Strappazzon,   Loris; Lansdell,   Nicola; Beverly,   Craig; Stoneham,   Gary.
This paper reports on a Catchment Modelling Framework (CMF) designed to support an Australian pilot of an auction for multiple environmental outcomes – EcoTender.  The CMF is used to estimate multiple environmental outcomes including carbon, terrestrial biodiversity, aquatic function (water quality and quantity) and saline land area.  This information was previously unavailable for application to environmental markets.  This is the first time a market-based policy has been fully integrated from desk to field with a Catchment Modelling Framework for the purchase of multiple outcomes.  This framework solves the unknown information problem of linking paddock scale landuse and management to catchment-scale environmental outcomes.  The framework provides the...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/25673

Testing Day’s Conjecture that More Nitrogen Decreases Crop Yield Skewness
Provedor de dados: 31
Autores: Du,   Xiaodong; Hennessy,   David A.; Yu,   Cindy L.
While controversy surrounds skewness attributes of typical yield distributions, a better understanding is important for agricultural policy assessment and for crop insurance rate setting. Day (1965) conjectured that crop yield skewness declines with an increase in low levels of nitrogen use, but higher levels have no effect. In a theoretical model based on the law of the minimum (von Liebig) technology, we find conditions under which Day’s conjecture applies. Employing four experimental plot datasets, we investigate the conjecture by introducing (a) a flexible Bayesian extension of the Just-Pope technology to incorporate skewness, and (b) a quantile-based measure of skewness shift. For corn yields, the Bayesian estimation provides strong evidence in favor...
Tipo: Working or Discussion Paper
Palavras-chave: Crop insurance; Gibbs sampler; Just and Pope technology; Negative skewness; Quantile regression.; Crop Production/Industries; Political Economy; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/93471

Development impact of higher education in Africa: The case of Uganda
Provedor de dados: 31
Autores: Obowna,   Marios; Ssewanyana,   Sarah N.
Using macro data from a series of household surveys, the paper demonstrates that to some extent there is positive correlation between per capita GDP growth and student enrollment in public universities in Uganda. It also finds that the higher education graduates employed in those sectors which have recorded higher growth rates. The higher education graduates do contribute to the economy indirectly through tax revenues which are in turn used to support social programs among others that benefit the society at large. the paper also demonstrates that the share of taxes from higher education graduates has been increasing over time...
Tipo: Report
Palavras-chave: Education; Universities; GDP; Ssewanyana; EPRC; Community/Rural/Urban Development; Consumer/Household Economics; Institutional and Behavioral Economics; Labor and Human Capital; Public Economics; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/94208

TOWARD A FRAMEWORK FOR EVALUATING AGRICULTURAL ECONOMICS RESEARCH
Provedor de dados: 31
Autores: Lindner,   Robert K.
Agricultural economists need to evaluate their own research priorities. The main difficulty in doing so is to value the types of information generated by economic research. Bayesian decision theory provides a framework for valuing information, and the results of selected studies using this methodology are collated. Most of the other determinants of research priorities can be encapsulated in a target return ratio measure. How such a framework might be used is illustrated by three 'hypotheticals'.
Tipo: Journal Article
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/22453

A NEW METHODOLOGY FOR THE ESTIMATION OF LAND VALUE
Provedor de dados: 31
Autores: Szucs,   Istvan; Fekete-Farkas,   Maria; Vinogradov,   Szergey A.
In the framework of National Research and Development program No. 4/015/2004 “Land quality, land value and sustainable land use in conditions of European Union” has been developed the methodology of a complex land evaluation using modern technical means. Complex evaluation means an organic systematization of ecological and economical factors. The ecological assessment of land is executed in the D-e-Meter point system. The economical evaluation systematizes the effects of economical factors in conformity with structure of the D-e-Meter system.
Tipo: Book
Palavras-chave: Land evaluation; D-e-Meter system; Corrected Gross Margin; Agricultural and Food Policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43403

Analysis of quantitative traits using regression and log-linear modeling when phase is unknown
Provedor de dados: 31
Autores: Mander,   Adrian P.
This function models the relationship between quantitative trait and the genotype of a person. It introduces a new syntax for model specification, which is necessary because when phase is unknown, the explanatory variables for the linear regression are never observed. The data must be a population-based sample because within family effects are not modeled.
Tipo: Journal Article
Palavras-chave: Haplotype analysis; Association studies; Phase-unknown; Linear regression; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115951

Participatory methods, guidelines and good practice guidance to be applied throughout the project to enhance problem definition, co-learning, synthesis and dissemination
Provedor de dados: 31
Autores: Bousset,   Jean-Paul; Macombe,   Catherine; Taverne,   M.
Tipo: Report
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/9302

Analysis of the Method for the Selection of Regions with Concentrated State Aid
Provedor de dados: 31
Autores: Krejci,   Igor; Voriskova,   Andrea.
The paper deals with the analysis of a method used by the Czech Government and the Ministry for Regional Development to select regions with concentrated state aid. It contains a comparison with several different basic methods of multi-criteria decision-making (MCDM). The analysis focuses on a mathematical algorithm of the established MCDM method and does not consider validity of any selected socioeconomic criteria and their weights. Both the strengths and weaknesses of the used MCDM method are presented. The paper includes a simple proposal of the modification of the examined method that will prevent incorrect data normalisation used for region’s evaluation before revision in 2010. Data used for all calculations were obtained from the Ministry for Regional...
Tipo: Journal Article
Palavras-chave: The weighted sum approach; The TOPSIS; Multi-criteria decision-making; Regions with concentrated state aid; District.; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; GA; IN.
Ano: 2010
URL: http://purl.umn.edu/96876

A Choice Modelling Survey of Community Attitudes to Improvements in Environmental Quality in NSW Catchments
Provedor de dados: 31
Autores: Mazur,   Kasia; Bennett,   Jeffrey W.
The survey was designed to estimate environmental values suitable for integration into MOSAIC, a bio-economic model for catchment and farm level planning. Local residents, as well as distant rural and distant urban communities, were surveyed in three NSW catchments (Lachlan, Namoi and Hawkesbury-Nepean) using choice modelling (CM). The survey aimed to find out respondents’ attitudes about, and preferences for, potential natural resource management (NRM) improvements. In total, 3,997 responses were collected from seven different locations in NSW. Fourteen split samples were established to allow for testing of incentive compatibility in CM, the impact of respondent location on values held, and scale effects.   This research report describes the development...
Tipo: Report
Palavras-chave: Nonmarket valuation; Choice modelling; Survey; Questionnaire design; Community/Rural/Urban Development; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94813

A general-purpose method for two-group randomization tests
Provedor de dados: 31
Autores: Kaiser,   Johannes; Lacy,   Michael G.
We outline a novel approach to calculate exact p-levels for two-sample randomization tests. The approach closely resembles permute in its applications, with the main difference being that the results are approximated only if the execution time needed to calculate exact p-levels would exceed a specified maximum. We demonstrate its use by deriving p-levels for the significance of Somers’ D, the coefficient of variation, the difference in means and in medians, and the difference in two multinomials.
Tipo: Article
Palavras-chave: Tsrtest; Mwtest; Fptest; Somersdtest; Cvtest; Vartest; Randomization tests; Monte Carlo; Two-sample problem; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122702

Speaking Stata: Graphing agreement and disagreement
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Many statistical problems involve comparison and, in particular, the assessment of agreement or disagreement between data measured on identical scales. Some commonly used plots are often ineffective in assessing the fine structure of such data, especially scatterplots of highly correlated variables and plots of values measured “before” and “after” using tilted line segments. Valuable alternatives are available using horizontal reference patterns, changes plotted as parallel lines, and parallel coordinates plots. The quantities of interest (usually differences on some scale) should be shown as directly as possible, and the responses of given individuals should be identified as easily as possible.
Tipo: Journal Article
Palavras-chave: Graphics; Comparison; Agreement; Paired data; Panel data; Scatterplot; Difference-mean plot; Bland–Altman plot; Parallel lines plot; Parallel coordinates plot; Pairplot; Parplot; Linkplot; Tukey; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116252

MULTIPLE OPTIMAL SOLUTIONS IN QUADRATIC PROGRAMMING MODELS
Provedor de dados: 31
Autores: Paris,   Quirino.
The problem of determining whether quadratic programming models possess either unique or multiple optimal solutions is important for empirical analyses which use a mathematical programming framework.  Policy recommendations which disregard multiple optimal solutions (where they exist) are potentially incorrect and less than efficient.  This paper proposes a strategy and the associated algorithm for finding all optimal solutions to any positive semidefinite linear complementarity problem.  One of the main results is that the set of complementary solutions is convex.  Although not obvious, this proposition is analogous to the well-known result in linear programming which states that any convex combination of optimal solutions is itself optimal.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1983
URL: http://purl.umn.edu/32089

EVALUATION OF COLLABORATIVE RESEARCH AND DEVELOPMENT: INSIGHTS FROM A SURVEY OF SUGAR INDUSTRY RESEARCHERS
Provedor de dados: 31
Autores: Henderson,   Tracy M.
The Australian agricultural research and development (R&amp;D) sector faces many challenges associated with the trend to increased collaborative research as promoted by the Cooperative Research Centre Program. Analysis of the results of an electronic survey of researchers involved in the sugar industry highlights economic, managerial, and sociological challenges associated with collaborative research. Researchers’ perceptions of the usefulness of a range of economic and non-economic evaluation techniques are also highlighted. It is shown that economic evaluation is appropriate for resource allocation and impact assessment purposes but is of limited value in monitoring and improving the process of collaborative research. A systems-based approach to the...
Tipo: Conference Paper or Presentation
Palavras-chave: Evaluation; Collaborative research; Sugar; Systems approach; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/57889

DO PRODUCER RISK ATTITUDES EFFECT THE SIZING OF ON-FARM HARVEST, DRYING, AND STORAGE SYSTEMS?
Provedor de dados: 31
Autores: Davis,   Todd D.; Patrick,   George F.
An on-farm harvest, drying and storage system simulation model is used to determine how producers' risk attitudes effect combine and dryer capacity.  Stochastic dominance determines the risk efficient combine and dryer set for a 2000 acre farm in central Indiana.  Capacities decrease as risk aversion increases.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1999
URL: http://purl.umn.edu/21640

Assessing the Spatial and Temporal Variation of Output-Input Elasticities of Agricultural Production in Turkey
Provedor de dados: 31
Autores: Yu,   Tun-Hsiang (Edward); Cho,   Seong-Hoon; Koc,   A. Ali; Gulden,   Boluk; Seung Gyu,   Kim.
Preliminary Draft
Tipo: Conference Paper or Presentation
Palavras-chave: Turkey; Agricultural Reform and Implementation Project; Geographically weighted regression; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q18; C3.
Ano: 2010
URL: http://purl.umn.edu/56544

TESTING THE PECKING ORDER THEORY AND THE SIGNALING THEORY FOR FARM BUSINESSES
Provedor de dados: 31
Autores: Zhao,   Jianmei; Katchova,   Ani L.; Barry,   Peter J.
Numerous empirical studies in the finance field have tested many theories for firms¡¦ capital structure. Under the assumption of asymmetric information, the pecking order theory proposes the financing order for farm businesses, which implies a negative relationship between their cash flow and leverage. Meanwhile, the signaling theory suggests a farms' financing strategy, meaning high quality farms prefer to facilitate their capital rising by sending diverse signals to potential lenders. Could these capital structure theories be applied for farm businesses?  This paper tests the applicability of the pecking order theory and the signaling theory for farm businesses. The results show that farm businesses not only follow the pecking order theory but also the...
Tipo: Conference Paper or Presentation
Palavras-chave: Farm Businesses; Pecking Order Theory; Signaling Theory; Research Methods/ Statistical Methods; Q14.
Ano: 2004
URL: http://purl.umn.edu/20215

North Dakota State University Sunflower Research: A Summary of Selected Research Projects
Provedor de dados: 31
Autores: Jacobsen,   Roy M.; Sell,   Randall S.; Watt,   David L.
Sunflower research in North Dakota focuses on variety testing. Additional research has been conducted on cost-effective cultural practices, possible use to produce a red dye food colorant, and the estimated economic impact of banning an insecticide. Variety testing has been conducted at most state experiment sites in North Dakota, including, Casselton Agronomy Seed Farm, Carrington Research Extension Center, Langdon, Minot, Williston, Dickinson, and Hettinger Experiment Stations. A comparison of the impact of conventional tillage and no tillage on sunflower in North Dakota has been conducted at Dickinson Experiment Station and USDA-ARS Northern Great Plains Research Laboratory, Mandan. A large number of diseases and pests may infect sunflower. The North...
Tipo: Report
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/51172

General equilibrium modelling in South Africa: What the future holds
Provedor de dados: 31
Autores: McDonald,   Scott; Punt,   Cecilia.
This paper provides an overview of the main research contributions of the past decade using general equilibrium models to analyse agricultural issues in South Africa. The methodological developments since the change to democracy ten years ago are viewed in the context of developments in this area of research carried out internationally. It will be shown in this paper that the modelling and computing techniques have vastly improved during the past decade, both in an ongoing attempt to refine existing models, and in an attempt to extend the modelling framework to make provision for issues that cannot be sufficiently captured in the standard comparative static models. These extensions include dynamic modelling, global modelling, environmental modelling and...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/31721

Fitting mixed logit models by using maximum simulated likelihood
Provedor de dados: 31
Autores: Hole,   Arne Risa.
This article describes the mixlogit Stata command for fitting mixed logit models by using maximum simulated likelihood.
Tipo: Article
Palavras-chave: Mixlogit; Mixlpred; Mixlcov; Mixed logit; Maximum simulated likelihood; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119283

WTP for Traceable Meat Attributes: A Meta‐analysis
Provedor de dados: 31
Autores: Cicia,   Gianni; Colantuoni,   Francesca.
Several researches evaluated consumers’ Willingness To Pay (WTP) for each meat traceable attribute, generating a lot of information in this regard, although related to the conditions of each study. In light of this, WTP estimates for traceability characteristics largely differ across the literature, leading sometimes to contrasting interpretations. Seeking a full, meaningful statistical description of the findings of a collection of studies, the meta‐analysis allows us analyzing the consistency across studies and controlling for factors thought to drive variations in WTP estimates. The meta‐analysis has been conducted of 23 studies that, in aggregate, report 92 valuations for WTP.
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100593

Stata tip 62: Plotting on reversed scales
Provedor de dados: 31
Autores: Cox,   Nicholas J.; Barlow,   Natasha L.M.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122594

A Comparison of Imputation Methods under Large Samples and Different Censoring Levels (PowerPoint)
Provedor de dados: 31
Autores: Lopez,   Jose Antonio.
PowerPoint Presentation
Tipo: Conference Paper or Presentation
Palavras-chave: Imputation methods; Multiple imputation; Censored prices; Protein demand; Elasticities; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; C81; Q11; R21.
Ano: 2011
URL: http://purl.umn.edu/109894

THE APPLICATION OF STOCHASTIC DOMINANCE TECHNIQUES TO MULTI-PERIOD PROBLEMS: ISSUES AND IMPLICATIONS
Provedor de dados: 31
Autores: Jeffrey,   Scott R.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/13547

Odds ratios and logistic regression: further examples of their use and interpretation
Provedor de dados: 31
Autores: Hailpern,   Susan M.; Visintainer,   Paul F.
Logistic regression is perhaps the most widely used method for adjustment of confounding in epidemiologic studies. Its popularity is understandable. The method can simultaneously adjust for confounders measured on different scales; it provides estimates that are clinically interpretable; and its estimates are valid in a variety of study designs with few underlying assumptions. To those of us in practice settings, several aspects of applying and interpreting the model, however, can be confusing and counterintuitive. We attempt to clarify some of these points through several examples. We apply the method to a study of risk factors associated with periventricular leucomalacia and intraventricular hemorrhage in neonates. We relate the logit model to...
Tipo: Journal Article
Palavras-chave: Cc; Cci; Cs; Csi; Logistic; Logit; Relative risk; Case–control study; Odds ratio; Cohort study; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116084

Instrumental variables, bootstrapping, and generalized linear models
Provedor de dados: 31
Autores: Hardin,   James W.; Schmiediche,   Henrik; Carroll,   Raymond J.
This paper discusses and illustrates the qvf command for fitting generalized linear models. The differences between this new command and Stata’s glm command are highlighted. One of the most notable features of the qvf command is its ability to include instrumental variables. This functionality was added specifically to address measurement error but may be utilized by the user for other purposes. The qvf command was developed in the C-language using Stata’s new plugin features and executes much faster than the glm ado-file.
Tipo: Journal Article
Palavras-chave: Measurement error; Instrumental variables; Murphy–Topel; Bootstrap; Generalized linear models; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116178

Another Look at Economies of Size Studies in Farming
Provedor de dados: 31
Autores: Jensen,   Harald R.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/8482

A THEORETICAL DEVELOPMENT AND EMPIRICAL TEST ON THE CONVERGENCE OF AGRICULTURAL PRODUCTIVITY IN THE USA
Provedor de dados: 31
Autores: Paudel,   Krishna P.; Sambidi,   Pramod R.; Sulgham,   Anil K.
This study explores the evidence of convergence in the U.S agriculture sector by using the state level total factor productivity (TFP) data. The empirical investigation conducted in this study does not find any evidence of convergence while looking at the state level TFP. However, there seems to be some support for convergence at the regional level.  Parametric and nonparametric models indicate significant role of human capital in explaining the regional discrepancies in agriculture productivity across states.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20175

Editors' Report - February 7, 2011
Provedor de dados: 31
Autores: Marchant,   Mary A.; Bosch,   Darrell J.
Tipo: Report
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2011
URL: http://purl.umn.edu/113516

AN ANALYSIS OF RATES OF CHANGE IN COMMUNITY PER CAPITA INCOME BY DISCRIMINANT ANALYSIS
Provedor de dados: 31
Autores: Murray,   Steven W.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/30271

MANITOBA/CANADA IMPACT ANALYSIS: A TWO REGION INPUT-OUTPUT MODEL
Provedor de dados: 31
Autores: MacMillan,   James A.; Coyle,   Barry T.; De Matos,   G.; Longmuir,   N.
Tipo: Technical Report
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/124303

Wages and employment in non-farm agricultural activities: a livelihood strategy in Nicaragua.
Provedor de dados: 31
Autores: Zúniga-González,   Carlos Alberto.
This article analyzes the indices for nonfarm agricultural activities, which combine agricultural activities with both employment and wages. They were made with panel data of the Living Measurement Standard Survey (1993, 1998, 2001 and 2005) and they were processed with econometric model as a parametric technique (Binary dependent variable model). The trend indices explain the varied combination of nonfarm and farming agricultural activities. In summary, when the economic public policy makers promote preventative measures in the labour market, we see that indices for nonfarm agricultural activities grow. In fact, small farmers use first, second and third nonfarm employment as livelihood strategies for clashing the public policy restrictive.
Tipo: Conference Paper or Presentation
Palavras-chave: RMEA; RMNFA; RSEA; RSENFA; RTEA; RTNFA; RMWAI; RMWNFAI; RSWAI; RSWNFAI; RTWAI; RTWNFAI; Community/Rural/Urban Development; Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/53076

Verfahren zur Korrektur des Embedding-Effektes bei der Kontingenten Bewertung
Provedor de dados: 31
Autores: Meyerhoff,   Jurgen.
The use of economic tools such as the benefit-cost analysis often requires determining non-market values of environmental goods. One of the appropriate measures to determine these values is the contingent valuation. As a stated preference technique it allows to measure non-use values as well as to value future states of the environment. However, the credibility of the contingent valuation is still under debate because people only state a hypothetical willingness to pay. One of the most debated elicitation effects of this method is the embedding effect. In this paper, two approaches to take account of that effect are presented. Both use follow-up questions in order to obtain self reports from respondents. Each approach was employed in one of two contingent...
Tipo: Journal Article
Palavras-chave: Contingent valuation method; Embedding effect; Disembedding questions; Non-use values; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/98081

Compliance-adjusted intervention effects in survival data
Provedor de dados: 31
Autores: Kim,   Lois G.; White,   Ian R.
Survival data are most frequently analyzed by the intention-to-treat principle. However, presenting a compliance-adjusted analysis alongside the primary analysis can provide an insight into the effect of the treatment for those individuals actually complying with their randomized intervention. There are a number of methods for this type of analysis. Loeys and Goetghebeur (2003) use proportional hazards techniques to provide an estimate of the treatment effect for compliers when compliance is measured on an all-or-nothing scale. This methodology is here made available through a new Stata command, stcomply.
Tipo: Journal Article
Palavras-chave: Stcomply; Compliance; Proportional hazards; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116246

Stata tip 69: Producing log files based on successful interactive commands
Provedor de dados: 31
Autores: Riley,   Alan R.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122626

Willingness to Pay for Traceable Meat Attributes: A Meta-analysis
Provedor de dados: 31
Autores: Cicia,   Gianni; Colantuoni,   Francesca.
Several researches evaluated consumers’ Willingness To Pay (WTP) for each meat traceable attribute, generating a great deal of information in this regard, although specific to the conditions of each study. In light of this, WTP estimates for traceability characteristics differ across the literature, leading sometimes to contrasting interpretations. Seeking a full, meaningful statistical description of the findings of a collection of studies, the meta-analysis allows us to analyze consistency across studies and control for factors thought to drive variations in WTP estimates. The meta-analysis has been conducted using 23 studies that, in aggregate, report 88 valuations for WTP. Our results, aside from releasing unconditional information on the WTP for...
Tipo: Journal Article
Palavras-chave: Meta-analysis; Food traceability; Willingness to Pay; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/97028

Impact of United States Corn-based Ethanol Production on Land Use
Provedor de dados: 31
Autores: Sobowale,   Folakemi; Dicks,   Michael R.; Campiche,   Jody L.
The purpose of this research was to determine whether indirect land use occurs and if so to what extent.  Indirect land use is a change from non-cropland to cropland (e.g. deforestation) that may occur in response to increasing scarcity of cropland.  As farmers worldwide respond to higher crop prices in order to maintain the global food supply and demand balance, pristine lands are cleared and converted to new cropland to replace the crops for feed and food that were diverted elsewhere to biofuels production. We examine the impact of corn-based ethanol production in the United States on land use in other countries.
Tipo: Conference Paper or Presentation
Palavras-chave: Ethanol; Energy; Biofuel; Pristine lands.; Agricultural and Food Policy; Environmental Economics and Policy; Land Economics/Use; Production Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/98854

An Information-Theoretic Approach to Modeling Binary Choices: Estimating Willingness to Pay for Recreation Site Attributes
Provedor de dados: 31
Autores: Henry-Osorio,   Miguel; Mittelhammer,   Ronald C.
Information-Theoretic Econometrics
Tipo: Presentation
Palavras-chave: Minimum power divergence; Cressie-Read statistics; Contingent valuation; Empirical likelihood; Discrete choice; Binary response models; Environmental Economics and Policy; Research Methods/ Statistical Methods; C13; C14; C25; Q51.
Ano: 2012
URL: http://purl.umn.edu/123432

Maatschappelijke kostenbatenanalyse voor de visserij:   Een verkenning naar een MKBA in een mariene omgeving
Provedor de dados: 31
Autores: Buisman,   F.C.; Vos,   Birgit I. de.
An SCBA is an important valuation instrument for big infrastructural projects. However, most of the investment projects for which an SCBA is performed are land-based projects. Performing an SCBA for projects in a marine environment involve other valuation issues. These are studied in this report based on the fisheries.
Tipo: Report
Palavras-chave: Valuation instrument; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43075

Practical fixed-effects estimation methods for the three-way error-components model
Provedor de dados: 31
Autores: Andrews,   Martyn; Schank,   Thorsten; Upward,   Richard.
Methods for fixed-effects estimation of the three-way error-components model are not yet standard. Where possible, we make the fixed-effects methods originally developed by Abowd, Kramarz, and Margolis (Econometrica 67: 251–333) for linked worker-firm data more accessible. We also show how these methods can be implemented in Stata. There is a caveat, however. If the researcher wants to recover estimates of the error components themselves, and the number of units at the higher level of aggregation is large, memory or matrix constraints may make using Stata to estimate the components themselves infeasible.
Tipo: Article
Palavras-chave: Grouping; Linked employer–employee panel data; Fixed effects; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119239

Speaking Stata: Identifying spells
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Spells in time series (and more generally in any kind of one-dimensional series) may be defined as sequences of observations that are homogeneous in some sense. For example, a categorical variable may remain in the same state, or values of a measured variable may satisfy the same true–false condition. Devices for working with spells in Stata include marking the start of each spell with indicator variables and tagging spells with integer codes. Panel data are easy to handle with the by: prefix. Some kinds of spell identification require two passes through the data, as when only spells of some minimum length are of interest or short gaps are tolerable within spells. Many questions concerning spells are easy to answer given careful use of by: and appropriate...
Tipo: Article
Palavras-chave: Spells; Runs; Time series; Data management; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119273

A MORE OBJECTIVE PROCEDURE FOR DETERMINING ECONOMIC SUBREGIONS: CLUSTER ANALYSIS
Provedor de dados: 31
Autores: Cox,   P. Thomas; Siskin,   Bernard; Miller,   Allan.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1969
URL: http://purl.umn.edu/29854

Multinomial goodness–of–fit: Large–sample tests with survey design correction and exact tests for small samples
Provedor de dados: 31
Autores: Jann,   Ben.
I introduce the new mgof command to compute distributional tests for discrete (categorical, multinomial) variables. The command supports largesample tests for complex survey designs and exact tests for small samples as well as classic large-sample x2-approximation tests based on Pearson’s X2, the likelihood ratio, or any other statistic from the power-divergence family (Cressie and Read, 1984, Journal of the Royal Statistical Society, Series B (Methodological) 46: 440–464). The complex survey correction is based on the approach by Rao and Scott (1981, Journal of the American Statistical Association 76: 221–230) and parallels the survey design correction used for independence tests in svy: tabulate. mgof computes the exact tests by using Monte Carlo methods...
Tipo: Article
Palavras-chave: Mgof; Mgofi; Multinomial; Goodness-of-fit; Chi-squared; Categorical data; Exact tests; Monte Carlo; Exhaustive enumeration; Combinatorial algorithms; Complex survey correction; Power-divergence statistic; Kolmogorov–Smirnov; Benford's law; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122584

Targeting the poor and smallholder farmers: empirical evidence from Malawi
Provedor de dados: 31
Autores: Houssou,   Nazaire; Zeller,   Manfred.
This paper develops low cost, reasonably accurate, and simple models for improving the targeting efficiency of development policies in Malawi. Using a stepwise logistic regression (weighted) along with other techniques applied in credit scoring, the research identifies a set of easily observable and verifiable indicators for correctly predicting whether a household is poor or not, based on the 2004-05 Malawi Integrated Household Survey data. The predictive power of the models is assessed using out-of-sample validation tests and receiver operating characteristic curves, whereas the model’s robustness is evaluated by bootstrap simulation methods. Finally, sensitivity analyses are performed using the international and extreme poverty lines. The models...
Tipo: Working or Discussion Paper
Palavras-chave: Malawi; Poverty targeting; Proxy means tests; Out-of-sample tests; Bootstrap; Food Security and Poverty; Research Methods/ Statistical Methods; I32; C15.
Ano: 2009
URL: http://purl.umn.edu/57988

Returns to policy-related social science research in agriculture
Provedor de dados: 31
Autores: Gardner,   Bruce L.
Policy research is valuable as a source of information for decisionmakers. The value of research is the expected social gain from policy decisions influenced by the information generated. The gain from a decision depends on choosing the best policy given the state of the world, which is uncertain. The output of policy research is a conclusion about that state. Taking a Bayesian approach, the ex ante value of a research program is estimated from information about decisionmakers’ prior probabilities of the state of the world and the likelihood of correct and incorrect research findings. Case studies of U.S. agricultural policy research cover consequences of trade liberalization, farm commodity program analysis, effects of publicly supported commodity...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/48651

Speaking Stata: On getting functions to do the work
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Functions in Stata take two main forms, built-in functions that are part of the executable and egen functions written in Stata’s own language. These are surveyed, giving a variety of tips and tricks, and noting the large number of user-written egen functions available for download from the Internet. Two substantial examples, the calculation of percentile ranks and plotting positions, and the calculation of measures summarizing properties of the other members of a group, provide detailed illustrations of egen in action.
Tipo: Journal Article
Palavras-chave: Functions; Egen; Strings; Percentile ranks; Plotting positions; Family data; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116026

Increased Cocoa Bean Exports under Trade Liberalization: A Gravity Model Approach
Provedor de dados: 31
Autores: Yeboah,   Osei-Agyeman; Shaik,   Saleem; Wozniak,   Shawn J.; Allen,   Albert J.
Gravity models were developed to estimate the potential bilateral exports of cocoa under trade liberalization by the sixteen major cocoa producing countries to the US using panel data from 1989 to 2003. The results indicate that differences between resource endowment, relative size of economies, and the sum of bilateral GDP of U.S. and exporting countries are the major determinants. Thus, as trade is liberalized, farmers share of the world price of cocoa increases and this raises exports.
Tipo: Conference Paper or Presentation
Palavras-chave: Gravity models; Bilateral exports; Market liberalization; Cocoa; Fixed Effects Model; Random Effects Model; Pooled O.L.S.; International Relations/Trade; Research Methods/ Statistical Methods; F10; F13.
Ano: 2008
URL: http://purl.umn.edu/6819

Normative, systemic and procedural aspects: a review of indicator‐based sustainability assessments in agriculture
Provedor de dados: 31
Autores: Binder,   Claudia R.; Feola,   Giuseppe.
Several methods for assessing the sustainability of agricultural systems have been developed. These methods do not fully: (i) take into account the multi‐functionality of agriculture; (ii) include multidimensionality; (iii) utilize and implement the assessment knowledge; and (iv) identify conflicting goals and trade‐offs. This paper reviews seven recently developed multidisciplinary indicator‐based assessment methods with respect to their contribution to these shortcomings. All approaches include (1) normative aspects such as goal setting, (2) systemic aspects such as a specification of scale of analysis, (3) a reproducible structure of the approach. The approaches can be categorized into three typologies. The top‐down farm assessments focus on field or...
Tipo: Conference Paper or Presentation
Palavras-chave: Sustainability assessment; Indicator; Agriculture; Sustainability solution space; Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Farm Management; International Development; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/117651

Estimation of Treatment Effect of Asthma Case Management Using Propensity Score Methods
Provedor de dados: 31
Autores: Brandt,   Sylvia J.; Gale,   Sara; Tager,   Ira.
Objective: To estimate the treatment effect from participating in an asthma intervention that was part of the National Asthma Control Program.  Study Setting: Data on children who participated in asthma case management (N=270) and eligible children who did not participate in case management (N=2,742) were extracted from a claims database.  Study Design: We created 81 measures of health care utilization and 40 measures of neighborhood characteristics that could be related to participation in the program. The participation model was selected using the cross-validation-based Deletion Substitution and Addition (DSA) algorithm. We used optimal full matching for the vector of Mahalanobis’ distances and propensity scores to estimate the difference between...
Tipo: Working or Discussion Paper
Palavras-chave: Asthma; Treatment effect; Health intervention; Propensity scores; Consumer/Household Economics; Health Economics and Policy; Research Methods/ Statistical Methods; I1; D13; H51; C31; C80; C81; C83.
Ano: 2009
URL: http://purl.umn.edu/53124

RELEVANCE OF DUALITY THEORY TO THE PRACTICING AGRICULTURAL ECONOMIST:  DISCUSSION
Provedor de dados: 31
Autores: Halter,   A.N.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32273

Abstracts:  Proceeding of National Seminar on "Integrated Rural Development and Management: Issues, Strategies and Policy Options"
Provedor de dados: 31
This document is a collection of 157 abstracts received during the National Seminar on "Integrated Rural Development and Management: Issues, Strategies and Policy Options" held at the IRDM Faculty Centre of Ramakrishna Mission Vivekananda University during 17-18 December, 2010
Tipo: Conference Paper or Presentation
Palavras-chave: Sustainable Agriculture; Rural Health; Rural Education; Women and Child Education; Human Resource Development; Rural Development Administration; Corporate Social Responsibility; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Land Economics/Use; Livestock Production/Industries; Production Economics; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2010
URL: http://purl.umn.edu/98255

Sufficient Conditions for Dominance of Simply Related Prospects
Provedor de dados: 31
Autores: Drynan,   Ross G.
Sufficient conditions for dominance of simply related prospects are developed for newly defined classes of limited-variation-in-risk-parameter utility functions. Necessary and sufficient conditions are given for classes of contant-risk-parameter utility functions. The latter include classes of quadratic, power and exponential utility functions. The conditions can be incorporated into easily implemented procedures for locating efficient prospects.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/12308

Spatially Delineated Public Goods and Spatially Located Public Bads: A Hedonic Approach to Measuring Urban Revitalization
Provedor de dados: 31
Autores: Brown,   John; Geoghegan,   Jacqueline.
A regression discontinuity approach is used to measure the impact of public-goods creating programs in a declining inner city neighborhood of Worcester Massachusetts. Using GIS data, we develop a hedonic model of residential sales, using a parcel-level GIS tax assessment and land use database linked to property sales data for the years 1988 through 2007, to test the effect of the creation of a new high-performing public school, as well as other locational amenities and disamenities on neighborhood housing prices, by comparing properties adjacent to either side of the school catchment area boundary.
Tipo: Article
Palavras-chave: Regression discontinuity; Spatial hedonic model; Urban revitalization; Community/Rural/Urban Development; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/120683

Speaking Stata: How to face lists with fortitude
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Three commands in official Stata, foreach, forvalues, and for, provide structures for cycling through lists of values (variable names, numbers, arbitrary text) and repeating commands using members of those lists in turn. All these commands may be used interactively, and none is restricted to use in Stata programs. They are explained and compared in some detail with a variety of examples. In addition, a self-contained exposition is given on local macros, understanding of which is needed for use of foreach and forvalues.
Tipo: Journal Article
Palavras-chave: Foreach; Forvalues; For; Lists; Local macros; Substitution first; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115962

Between Estimates of the Environmental Kuznets Curve
Provedor de dados: 31
Autores: Stern,   David I.
Acknowledgements: Elbert Dijkgraaf for providing the data used in their paper.
Tipo: Report
Palavras-chave: Carbon; Sulfur; Environmental Kuznets curve; Between estimator; Environmental Economics and Policy; Research Methods/ Statistical Methods; C23; Q53; Q56.
Ano: 2009
URL: http://purl.umn.edu/94883

VALUES OF SCAN RESEARCH
Provedor de dados: 31
Autores: Capps,   Oral, Jr.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/26846

Dynamic and Asymmetric Adjustment in Beef and Pork Prices
Provedor de dados: 31
Autores: Hahn,   William F.
Beef and pork prices at farm, wholesale and retail are examined for evidence of a dynamic and asymmetric price transmission using an endogenous switching model.  Dynamic adjustment means that it take time for prices to adjust to changes in the market.  Price transmission is asymmetric if the speed or completeness of price adjustment depends on the direction that the price or a related price is moving.  Some of the previous research on price transmission in agricultural markets attempts to use market power abuses as an explanation of price-transmission asymmetry.  Other research shows that price transmission asymmetry can arise in competitive markets and that competitive and anti-competitive issues can make prices adjust faster upwards or downwards.   By...
Tipo: Conference Paper or Presentation
Palavras-chave: Asymmetric price transmission; Beef; Pork; Demand and Price Analysis; Industrial Organization; Research Methods/ Statistical Methods; C30.
Ano: 2010
URL: http://purl.umn.edu/61135

Land Use Change: A Spatial Multinomial Choice Analysis
Provedor de dados: 31
Autores: Carrion-Flores,   Carmen E.; Flores-Lagunes,   Alfonso; Guci,   Ledia.
Urban decentralization and dispersion trends have led to increased conversion of rural lands in many urban peripheries and exurban regions of the U.S. The growth of the exurban areas has outpaced growth in urban and suburban areas, resulting in growth pressures at the urban-rural fringe. A thorough analysis of land use change patterns and the ability to predict these changes are necessary for the effective design of regional environmental, growth, and development policies. We estimate a multinomial discrete choice model with spatial dependence using parcel-level data from Medina County, Ohio. Accounting for spatial dependence should result in improved statistical inference about land use changes. Our spatial model extends the binary choice “linearized...
Tipo: Conference Paper or Presentation
Palavras-chave: Land Use Change; Multinomial Logit; Spatial Dependence; Community/Rural/Urban Development; Land Economics/Use; Research Methods/ Statistical Methods; R14; C21; C25.
Ano: 2009
URL: http://purl.umn.edu/49403

Review of A Stata Companion to Political Analysis by Pollock
Provedor de dados: 31
Autores: Allard,   Scott W.
This article reviews A Stata Companion to Political Analysis by Philip H. Pollock III.
Tipo: Article
Palavras-chave: Textbook; Political analysis; Introductory statistics; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119247

THE APPROXIMATION OF NONLINEAR PROGRAMMING PROBLEMS USING LINEAR PROGRAMMING
Provedor de dados: 31
Autores: Apland,   Jeffrey.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/14143

Automatic generation of documents
Provedor de dados: 31
Autores: Gini,   Rosa; Pasquini,   Jacopo.
This paper describes a natural interaction between Stata and markup languages. Stata’s programming and analysis features, together with the flexibility in output formatting of the markup languages, allow generation and/or update of whole documents (e.g., reports, presentations on screen or web). We give examples for both LaTeX and HTML.
Tipo: Journal Article
Palavras-chave: Doutput; Format; Report; LaTeX; HTML; Markup language; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117554

Proportionality of Willingness to Pay to Small Risk Changes – The Impact of Attitudinal Factors in Scope Tests
Provedor de dados: 31
Autores: Leiter,   Andrea M.; Pruckner,   Gerald J.
Sensitivity (proportionality) of willingness to pay to (small) risk changes is often used as a criterion to test for valid measures of economic preferences. In a contingent valuation (CV) study conducted in Austria in February 2005 1,005 respondents were asked their willingness to pay (WTP) for preventing an increase in risk by 1/42,500 and 3/42,500, respectively. WTP for the higher risk variation is significantly higher than WTP for the lower risk change. We find evidence that those respondents who have personal experience with avalanches combine the information about future risk increase, provided in the survey, with the observed number of mortal avalanche accidents in the past. The proportionality of WTP holds if such prior experiences are taken into...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/12225

Evaluation on Woodland Intensive Use - A Case of Wenhe Operating Zone in Yakeshi City of China
Provedor de dados: 31
Autores: Zhang,   Xia; Zhao,   Deyi; Li,   Guoqiang.
Based on apprehending the conception of intensive use of woodland, 12 indices are selected from the aspects of economy, society, ecology and so on according to the principles of scientific systematization, collectible index and system inner linkage. A scientific evaluation index system for woodland intensive use is constructed. Range Standardization Method is adopted in order to eliminate the differences among indices; index weight is calculated by the objective variation coefficient weight method. Physio geographic condition, woodland area and forest resource of Wenhe Operating Zone in Yakeshi City, China are introduced. According to the 2004-2008 relevant statistical data, intensive use level of Wenhe Operating Zone is evaluated. Result shows that the...
Tipo: Thesis or Dissertation
Palavras-chave: Woodland; Intensive use; Variation coefficient weight method; Wenhe Operating Zone of China; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/54031

Constructing Farm Level Yield Densities from Aggregated Data: Analysis and Comparison of Approaches
Provedor de dados: 31
Autores: Cooper,   Joseph C.; Langemeier,   Michael R.; Schnitkey,   Gary D.; Zulauf,   Carl R.
Yield variability can be significantly higher at the farm level than at more aggregated levels, including the county. However, due to a dearth of available farm level data, much stochastic analysis involving farm yields utilizes more aggregated yield data as a proxy for the farm level.  We empirically evaluate farm-level variability using longitudinal farm level data sets available from the Kansas Farm Management Association and the Illinois Farm Business and Farm Management Association.  For corn, soybeans, and wheat, we compare the farm level yield variability obtained from this data to that inferred from Federal crop insurance premiums.  The farm management data exhibit lower yield variability than are implied by the crop insurance premiums.
Tipo: Conference Paper or Presentation
Palavras-chave: Yield variability; Crop insurance; Corn; Wheat; Soybeans; Agricultural and Food Policy; Crop Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/49216

Speaking Stata: Rowwise
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Stata’s main data model treats observations in rows and variables in columns quite differently, but rowwise problems also arise that require working against the grain. This column shows how to exploit existing functions and egen functions when they exist and apply to such problems. It offers advice on how to build your own loops, egen functions, or programs when needed. Mata provides especially convenient tools for constructing many such functions and programs, centered on putting selected data into matrices and then processing each observation as a separate vector. Two programs, rowsort and rowranks, are formally published with this column.
Tipo: Article
Palavras-chave: Rowsort; Rowranks; Rows; Functions; Loops; Egen; Mata; Minimum; Maximum; Median; Any; All; Distinct values; Sorting; Ranking; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122706

Implementing double-robust estimators of causal effects
Provedor de dados: 31
Autores: Emsley,   Richard; Lunt,   Mark; Pickles,   Andrew; Dunn,   Graham.
This article describes the implementation of a double-robust estimator for pretest–posttest studies (Lunceford and Davidian, 2004, Statistics in Medicine 23: 2937–2960) and presents a new Stata command (dr) that carries out the procedure. A double-robust estimator gives the analyst two opportunities for obtaining unbiased inference when adjusting for selection effects such as confounding by allowing for different forms of model misspecification; a double-robust estimator also can offer increased efficiency when all the models are correctly specified. We demonstrate the results with a Monte Carlo simulation study, and we show how to implement the double-robust estimator on a single simulated dataset, both manually and by using the dr command.
Tipo: Article
Palavras-chave: Dr; Double-robust estimators; Causal models; Confounding; Inverse probability of treatment weights; Propensity score; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122597

State of the ARMS - Crop Production Practices
Provedor de dados: 31
Autores: Ebel,   Robert M.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural Surveys; Production Practices; Government Surveys; Production Economics; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61043

Stata tip 26: Maximizing compatibility between Macintosh and Windows
Provedor de dados: 31
Autores: Hanson,   Michael S.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117551

ECONOMIC ANALYSIS IN POLICY EVALUATION, DAMAGE ASSESSMENT AND COMPENSATION: A COMPARISON OF APPROACHES
Provedor de dados: 31
Autores: Hanemann,   W. Michael; Keeler,   Andrew G.
Tipo: Working or Discussion Paper
Palavras-chave: Public Economics; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/6862

The Stata command felsdvreg to fit a linear model with two high–dimensional fixed effects
Provedor de dados: 31
Autores: Cornelissen,   Thomas.
This article proposes a memory-saving decomposition of the design matrix to facilitate the estimation of a linear model with two high-dimensional fixed effects. A common way to fit such a model is to take into account one of the effects by including dummy variables and to sweep out the other effect by the within transformation (fixed-effects transformation). If the number of panel units is high, creating and storing the dummy variables can involve prohibitively large computer-memory requirements. The memory-saving procedure to set up the moment matrices for estimation presented in this article can reduce the memory requirements considerably. The companion Stata ado-file felsdvreg implements the estimation method, takes care of identification issues, and...
Tipo: Article
Palavras-chave: Felsdvreg; Linked employer–employee data; Fixed effects; Three-way error-components model; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122585

A PARTIAL EQUILIBRIUM MODEL OF THE LINKAGES BETWEEN ANIMAL WELFARE, TRADE AND THE ENVIRONMENT IN SCOTLAND
Provedor de dados: 31
Autores: Toma,   Luiza; Ashworth,   Cheryl J.; Stott,   Alistair W.
This research analyses the impacts of a scientific advance that improves animal welfare, upon the environment and trade in Scotland using partial equilibrium (PE) modelling. The science improves pig neonatal survival through improved (high fibre) sow diets used before mating. Our model simulates the effects of animal welfare changes on the pig production systems (pig meat) and further on trade flows (trade in pig meat) and environment (water and air pollution). We consider two animal welfare simulation scenarios, namely the status quo – no animal welfare change as regards pig neonatal mortality (baseline scenario) and the case of improving pig neonatal survival (alternative scenario) and compare the impacts on trade and environment between the two...
Tipo: Conference Paper or Presentation
Palavras-chave: Pig Welfare; Trade; Environment; Scotland; Partial Equilibrium Model.; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q18; Q50.
Ano: 2008
URL: http://purl.umn.edu/44825

AN ASSESSMENT OF WORKAROUNDS FOR SPATIAL EFFECTS IN THE CASE OF BINARY PROBIT
Provedor de dados: 31
Autores: Robertson,   Richard D.; Nelson,   Gerald C.
The consequences of spatial effects on discrete choice models have not been well established. Various ad hoc workarounds have been proposed to mitigate potential estimation problems. This paper employs Monte Carlo simulation to investigate the severity of the problems introduced by spatial effects and the effectiveness of the workarounds.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20234

Improving Information About America's Farms and Ranches: A Review of the Census of Agriculture
Provedor de dados: 31
Tipo: Report
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/37356

Technology Adoption by Heterogeneous Producers to Regulate a Stock Externality
Provedor de dados: 31
Autores: Xabadia,   Angels; Goetz,   Renan-Ulrich; Zilberman,   David.
This paper presents a framework to determine optimal resource allocation over time for the production of a good by heterogeneous producers who generate a stock externality. We analyze the optimal intertemporal and quality-specific combination of abatement strategies at the source given by a change in the intensity of production and in the chosen technology, and/or removal of existing pollution stock. The results show how the specifications of the production and the emission functions affect technology adoption and the design of the optimal intertemporal combination of source and stock abatement strategies. Moreover, the paper shows that regulation at the intensive margin cannot be considered as a substitute for a regulation at the extensive margin. The...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19538

Manual for conducting socioeconomic surveys through Pocket Portable Device Assistants (PDAs) and personal computers
Provedor de dados: 31
Autores: Perea,   Federico Carrion; La Rovere,   Roberto.
Tipo: Report
Palavras-chave: Socioeconomic environment; Surveys; Computers; Computer software; Data collection; PDAs; Personal computers; Research Methods/ Statistical Methods; U40; E10.
Ano: 2009
URL: http://purl.umn.edu/56176

Responsibility and Sustainability in a Food Chain: A Priority Matrix Analysis
Provedor de dados: 31
Autores: Caracciolo,   Francesco; Gorgitano,   Maria Teresa; Lombardi,   Pasquale; Sanino,   Giuliana; Verneau,   Fabio.
This paper shows the results of empirical research conducted to assess the sustainability of a typical food supply chain, suggesting feasible solutions to satisfy inter-dimensional requisites of durable development. The analysis was conducted with reference to the supply chain of the San Marzano tomato (SMZ), a typical local food. The product is endowed with an origin certification label (PDO), meeting demand within high-value market niches. The SMZ is a flagship product in the Italian region of Campania and has benefited from several regionally funded interventions, such as genetic research and support for the application for EU certification of origin). Two key findings emerged from the research. First, the results allowed us to define a Stakeholder...
Tipo: Article
Palavras-chave: PDO product; Sustainability assessment; Food chain management.; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Research Methods/ Statistical Methods; Q01; Q20; Q50.
Ano: 2011
URL: http://purl.umn.edu/121950

ON SUPPLY SIDE OPTION VALUE
Provedor de dados: 31
Autores: Graham-Tomasi,   Theodore; Myers,   Robert J.
In this paper the ability to sign supply-side option value is studied.  The compensating and equivalent option prices are defined, and it is argued that equivalent option price is the preferred welfare measure.  In the absence of income risk, if the probability distribution of supply is degenerate either with or without the project, one-way test of project acceptance can be established.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/13341

Game Analysis of Rural Collective Construction Land Circulation in Rapidly Industrialized Area of China - A case of Nanhai District of Foshan City
Provedor de dados: 31
Autores: Tang,   Changchun; Lan,   Wanlian.
This paper introduces the basic principles and application of game theory, sets up the game model of rural construction land circulation, and analyzes the utility function results under the approval of local government of China, taking Nanhai District of Foshan City as an example. Research result shows that under the current macro-economy and system conditions, the optimal way of rural construction land circulation and expansion in rapidly industrialized area is to realize independent circulation in accordance with laws and regulations without changing the land ownership. The effective approach of regulating and controlling independent circulation is to optimize game structure and the utility functions by implementing demand management of construction...
Tipo: Thesis or Dissertation
Palavras-chave: Industrialization; Construction land; Circulation; Game; Nanhai District of China; Community/Rural/Urban Development; Industrial Organization; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53518

Foreign Direct Investment, Spillovers and the Impact of Intellectual Property: Rights in the Seed Sector
Provedor de dados: 31
Autores: Derwisch,   Sebastian; Kopainsky,   Birgit; Henson-Apollonio,   Victoria.
The role of foreign direct investment and intellectual property rights in economic development is discussed widely in the literature. However, an integrating framework is missing to assess the role of FDI and IPR for agricultural development. This paper establishes a framework to assess the role of FDI and IPR for seed sector development in developing countries. The impact assessment is carried out with a System Dynamics model that shows local capacity development to develop new seed varieties in the scenario of a multinational company penetrating the market and spillovers occurring. Simulation runs reveal the impact of IPR on the quantity technology transferred by multinational companies and on spillovers. The development path of the local industry...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100463

Econometric Analysis of Milk Value Chain
Provedor de dados: 31
Autores: Matulova,   Katerina; Bubakova,   Petra; Skubna,   Ondrej; Taussigova,   Tereza.
This article deals with the basic analysis of price transmission in the milk agri-food chain. The analysis is aimed at deriving the fundamental relationships between milk prices at the individual levels of the chosen vertical. The results are then validated with the use of statistical hypotheses testing. From the derived single equation models, it is clear that there is a strong difference in the leverage of individual factors influencing the price at different levels of the milk value chain. The results were elaborated within the research intention IVZ MSM 6046070906
Tipo: Journal Article
Palavras-chave: Agri-food Chain; Milk; Price Transmission; Statistical Test; Demand and Price Analysis; Financial Economics; Research Methods/ Statistical Methods; GA; IN.
Ano: 2010
URL: http://purl.umn.edu/99222

EMPIRICAL ANALYSIS OF AGRICULTURAL COMMODITY PRICES: A VIEWPOINT
Provedor de dados: 31
Autores: Tomek,   William G.; Myers,   Robert J.
Numerous models of price-demand-supply behavior in agricultural markets have been proposed and estimated. The literature contains valuable contributions, but the cumulative effect is somewhat disappointing. This paper appraises the status of the price analysis literature and makes suggestions for improving the quality of empirical results. Both structural and time-series models are appraised.
Tipo: Working or Discussion Paper
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/6847

DISTRIBUTION CHOICE UNDER NULL PRIORS AND SMALL SAMPLE SIZE
Provedor de dados: 31
Autores: Feldman,   Paul A.; Richardson,   James W.; Schumann,   Keith D.
Defining appropriate probability distributions for the variables in an economic model is an important and often arduous task.  This paper evaluates the performance of several common probability distributions under different distributional assumptions when sample sizes are small and there is limited information about the data.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20012

MODELING THE IMPACTS OF ALTERNATIVE INVASIVE SPECIES MANAGEMENT POLICIES ON LIVESTOCK PRODUCTION
Provedor de dados: 31
Autores: Zhao,   Zishun; Wahl,   Thomas I.; Diaz,   Ricardo.
In this paper, a dynamic optimization modeling framework for livestock production is developed for the purpose of evaluating the welfare effects of the introduction of invasive species. A beef production model implemented based on the conceptual framework shows that the model is valid and stable. The modeling framework can be used to assess the welfare effects under alternative IS management policies and optimal resource allocation schemes for policymakers.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20316

Effects of Non-farm Employments on Poverty among Small Households in Developed Villages of Bangladesh: A Case of Comilla Sadar Upazila
Provedor de dados: 31
Autores: Malek,   Mohammad Abdul; Usami,   Koichi.
The study aims at estimating comprehensive effects of non-farm employments (NFEs) on poverty based on an intensive field survey conducted in 2008 on about 175 small landholding households in developed four villages of Comilla Sadar Upazila. We analyze participating factors of small household workers in NFEs and their effects on household production (farming and non-farm activities) and consumption (both food and non-food). For estimating consumption effects (poverty), we focus on food adequacy, income poverty and education poverty (as a part of human poverty). At each level of estimation, we depend on appropriate econometric regressions. Results find the significant positive role of overall NFEs on household NFAs rather faming. Remittance incomes do not...
Tipo: Conference Paper or Presentation
Palavras-chave: Non-farm employments; Household economy; Production; Consumption; Income poverty; Education poverty; Bangladesh; Consumer/Household Economics; Labor and Human Capital; Land Economics/Use; Research Methods/ Statistical Methods; J43; O15; Q12; Q17; R15.
Ano: 2009
URL: http://purl.umn.edu/52811

A NOTE ON FORMULATION OF PROPORTIONALITY RESTRAINTS IN LINEAR PROGRAMMING BLENDING PROBLEMS
Provedor de dados: 31
Autores: Filan,   S.J.
A class of restraints on proportions is observed to be relevant in many applications of linear programming, but problem formulation for these restraints has received little attention in the literature. An approach reported by Taylor [5] is summarized, and an alternative approach is outlined. The alternative is equivalent to the first approach but provides simplicity in problem specification and economies in data preparation.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1976
URL: http://purl.umn.edu/9165

A NOTE ON OPTIMAL RULES FOR STOCHASTIC EFFICIENCY ANALYSIS
Provedor de dados: 31
Autores: Drynan,   Ross G.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/22873

The Effect of Climate Change over Agricultural Factor Productivity: Some Econometric Considerations
Provedor de dados: 31
Autores: McCarl,   Bruce A.; Villavicencio,   Xavier; Wu,   Ximing.
This paper examines the role that climate change might be playing in the declining returns to agricultural research. For this purpose, we estimate a cross-section time-series model of agricultural total factor productivity for the U.S. states over the period 1970–1999, with the inclusion of climatic variables, and controlling for non stationarity of the data. Our findings suggest that after controlling for climatic variables and non stationarity, the effect of Public Agricultural Research Capital over Total Factor Productivity is reduced.
Tipo: Conference Paper or Presentation
Palavras-chave: Climate Change; Factor Productivity; Returns to Research; Panel Data; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C33; O13; Q16.
Ano: 2009
URL: http://purl.umn.edu/49452

ON CORPORATE RISK MANAGEMENT PRACTICES IN ROMANIAN COMPANIES
Provedor de dados: 31
Autores: Horobet,   Alexandra; Dumitrescu,   Sorin; Joldes,   Cosmin.
The purpose of this paper is to provide an understanding of corporate risk management practices in Romanian companies, by investigating the risk management approaches Romanian companies take. Our main findings are that Romanian managers are not aware of the magnitude of exposure their companies have to various types of risk – hazard, operational, financial and strategic risks, while they are able to manage rather well all these risks, even the ones that have the lowest impact on the business. At the same time, risk management systems employed by Romanian companies are rather inarticulate and based on traditional approaches towards risk management, which might represent by itself a major source of risk, given the complexity of the business environment they...
Tipo: Journal Article
Palavras-chave: Corporate risk assessment; Risk management; Romania; Agricultural and Food Policy; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53574

A STRUCTURAL EQUATION MODEL: GREECE’S TOURISM DEMAND FOR TOURIST DESTINATION
Provedor de dados: 31
Autores: Chaitip,   Prasert; Chaiboonsri,   Chukiat; Kovacs,   Sandor; Balogh,   Peter.
Structural equation model (LISREL 8) was applied to test the causal relationships between tourist travel motivations and tourist destination. A survey containing Likert scale questions was conducted to collect data from 100 tourists who had travelled to Greece’s tourist destination. With the help of factor analysis, four dimensions were identified for scales used in the study: travel cost satisfaction, tourism product, tourism product attributes, and tourism product management. Results indicated that the travel cost satisfaction of tourists has a positive influence on tourism product, tourism product attributes and tourism product management. Moreover, our results suggested that the tourist demographics has a positive influence on tourism product and...
Tipo: Journal Article
Palavras-chave: Greece; Tourism demand; Greece’s tourist destination; SEM model; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/91116

The WITCH Model. Structure, Baseline, Solutions
Provedor de dados: 31
Autores: Bosetti,   Valentina; Massetti,   Emanuele; Tavoni,   Massimo.
WITCH – World Induced Technical Change Hybrid – is a regionally disaggregated hard-link hybrid global model with a neoclassical optimal growth structure (top-down) and a detailed energy input component (bottom-up). The model endogenously accounts for technological change, both through learning curves that affect the prices of new vintages of capital and through R&amp;D investments. The model features the main economic and environmental policies in each world region as the outcome of a dynamic game. WITCH belongs to the class of Integrated Assessment Models as it possesses a climate module that feeds climate changes back into the economy. Although the model’s main features are discussed elsewhere (Bosetti et al., 2006), here we provide a more thorough...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/12064

Stata tip 15: Function graphs on the fly
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116283

USER'S GUIDE FOR "UTILITY PROGRAM (PLOTLINE) FOR AUTOMATICALLY SCALED GRAPHICAL PLOTTING OF CONTINUOUS LINES"
Provedor de dados: 31
Autores: Wong,   Lung-Fai; Hwang,   Henry H.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/13599

Pfadabhängigkeit als Forschungsprogramm für die Agrarökonomie
Provedor de dados: 31
Autores: Theuvsen,   Ludwig.
More than a decade ago, path dependence turned out to become a promising research program for agricultural economics. This article reviews important trends in path dependence research and highlights its role in the economics of technology, institutional economics, agricultural economics, and organization theory. Due to potential inefficiencies of path dependent processes, more and more researchers focus on path creation which has as yet not been understood very well. The implications of these recent developments for research questions and methodology of agricultural economics are sketched.
Tipo: Journal Article
Palavras-chave: Efficiency; Generating momentum; Mindful deviation; Path creation; Path dependence; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/97433

Analysis of matched cohort data
Provedor de dados: 31
Autores: Cummings,   Peter; McKnight,   Barbara.
Matching is occasionally used in cohort studies; examples include studies of twins and some studies of traffic crashes. Analysis of matched cohort data is not discussed in many textbooks or articles and is not mentioned in the Stata manuals. Risk ratios can be estimated using matched-pair cohort data with Stata’s mcc command. We describe a new command, csmatch, which can produce these risk ratios and is often more convenient. We briefly review flexible regression methods that can estimate risk ratios in matched cohort data: conditional Poisson regression and some versions of Cox regression.
Tipo: Journal Article
Palavras-chave: Csmatch; Cohort study; Conditional Poisson regression; Matching; Matched-pair; Matched cohort study; Risk ratio; Odds ratio; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116248

USE OF SIMULATION IN PLANNING
Provedor de dados: 31
Autores: Maki,   Wilbur R.; Barrett,   R.A.; Brady,   R.J.
Tipo: Working or Discussion Paper
Palavras-chave: Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/13946

Return to wine: A comparison of the hedonic, repeat sales, and hybrid approaches
Provedor de dados: 31
Autores: Fogarty,   James Joseph; Jones,   Callum.
Comparisons between the return to wine and standard financial assets are complicated in that the return to wine must be estimated from infrequent sales of heterogeneous wine brands. Wine returns can be estimated using several different approaches, and here the performance of the hedonic approach, repeat sales approach, and hybrid approach are compared using 14,102 auction sale observations for Australian wine over the period 1988 to 2000. For the data set considered the results show that the hybrid approach provides the most efficient estimates, and that the repeat sales approach provides significantly higher total return estimates than the other two approaches. The portfolio diversification benefit attributed to holding wine is then shown to vary with...
Tipo: Working or Discussion Paper
Palavras-chave: Return to wine; Price index; Research Methods/ Statistical Methods; C33; G12.
Ano: 2011
URL: http://purl.umn.edu/108668

Stata tip 9: Following special sequences
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116242

EMPIRICAL LIKELIHOOD ESTIMATORS OF THE LINEAR SIMULTANEOUS EQUATIONS MODEL
Provedor de dados: 31
Autores: Marsh,   Thomas L.; Mittelhammer,   Ronald C.; Judge,   George G.
Information theoretic estimators are specified for a system of linear simultaneous equations, including maximum empirical likelihood, maximum empirical exponential likelihood, and maximum log Euclidean likelihood.  Monte Carlo experiments are used to compare finite sample performance of these estimators to traditional generalized method of moments.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/20752

SOCIAL INDICATORS, BASEBOOK, BASELINE AND INDICATOR MODEL
Provedor de dados: 31
Autores: Womack,   Abner W.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/17201

The hysteresis phenomenon and benefit evaluation for pollution control in aquatic ecosystems
Provedor de dados: 31
Autores: Fisher,   Anthony C.; Hanemann,   W. Michael.
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1985
URL: http://purl.umn.edu/6191

AGRICULTURAL CHOICE DILEMMAS QUESTIONNAIRE
Provedor de dados: 31
Autores: Patrick,   George F.; Musser,   Wesley N.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/28635

PRODUCTIVITY GROWTH IN THE CARIBBEAN: A MEASURE OF KEY COMPONENTS
Provedor de dados: 31
Autores: Hutchinson,   Sharon D.; Langham,   Max R.
Productivity growth is decomposed into two components: technical change and efficiency change.  This assesses their relative importance to the international competitiveness of the agricultural sectors of selected Caribbean countries.  A nonparametric programming method is employed to compute Malmquist multifactor productivity indexes, which contrasts the innovation of races of these countries. Keywords: Multifactor productivity, Malmquist indexes, Caribbean agriculture, Relative efficiency, Technical efficiency
Tipo: Conference Paper or Presentation
Palavras-chave: Multifactor productivity; Malmquist indexes; Caribbean agriculture; Relative efficiency; Technical efficiency; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21532

A Unified Methodology for Estimating the Demand for Improved Seed at the Farm Level in Developing Agriculture
Provedor de dados: 31
Autores: Langyintuo,   Augustine S.; Mazuze,   Feliciano M.; Chaguala,   P.A.; Buque,   I.A.
This paper proposes a novel approach for estimating farm level seed demand in developing countries. In principle, a farmer views an improved seed as a derived input embodying production attributes and a technology embodying consumption characteristics and jointly decides on its adoption and the quantity of seed required to plant a predetermined area. Drawing on the theory of demand for consumption goods characteristics and production input attributes, this paper specified and estimated improved seed adoption and demand models simultaneously using data collected from 300 randomly selected farm households in the Manica, Sussundenga and Chockwé districts of Mozambique in the 2003/04 crop season. The demand model results suggest that adoption rate, household...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21091

HEALTH CHECK AND FARM EFFICIENCY: A COMPARATIVE ASSESSMENT OF FOUR EUROPEAN AGRICULTURAL REGIONS
Provedor de dados: 31
Autores: Arfini,   Filippo; Donati,   Michele.
The European Commission has always considered the Common Agricultural Policy (CAP) as a dynamic political tool that aims to link the agricultural sector with the evolving of the economic, financial, social and political dynamics that distinguish the Member States of the European Union. From this standpoint, the Health Check (HC) is much more than a simple assessment of the state of health of European agriculture; it is a drawing up of the “new rules” that are to manage the relations between farms and the market, on which the future efficiency and survival of the said farms and the production sectors that characterise entire European agricultural regions will depend. In this context, the aim of this paper is to present and analyse the "innovations" of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Health Check; Single Farm Payments; Technical Efficiency Index; DEA model; Positive Mathematical Programming.; Agricultural and Food Policy; Political Economy; Research Methods/ Statistical Methods; Q10; Q12; Q18.
Ano: 2008
URL: http://purl.umn.edu/44785

MODELLING IMPORT DEMAND SYSTEMS WITH NONSTATIONARY DATA: AN APPLICATION TO THE FRENCH IMPORTS OF VIRGIN OLIVE OIL
Provedor de dados: 31
Autores: Ben Kaabia,   Monia; Gil,   Jose Maria.
This paper aims to provide a flexible methodological framework to estimate import demand models, which explicitly considers the stochastic properties of data and the endogenous/exogenous nature of some variables. The French imports of virgin olive oil have been used as a case study with Spain, Italy and the Rest of the World as main suppliers. The methodological framework starts by the specification a reduced-form VAR. Appropriated exogeneity tests show the exogeneity of Total Real Imports, indicating the appropriateness of estimating a conditional model. Two cointegration relationships have been found. Several restrictions have been tested in order to identify them as AIDS equations. From structural coefficients of the restricted cointegrated vectors...
Tipo: Conference Paper or Presentation
Palavras-chave: Virgin olive oil; France; Demand for imports; Cointegration; And exogeneity.; Demand and Price Analysis; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6696

Monitoring Economic and Social Changes within NSW Water Sharing Plan Areas: A Participatory Approach
Provedor de dados: 31
Autores: Bari,   Maksudul; Singh,   Inderpal; Flavel,   Noel J.
This paper presents a participatory approach being used to monitor the changes in economic and social indicators within the Water Sharing Plan areas in NSW. The approach entails close cooperation and input from the stakeholders comprising engagement and scoping; profiling, literature review and media scanning; indicators selection; data collection; and analysis and reporting over time. The monitoring data on the key economic and social indicators will be used for review of the Water Sharing Plans as well as further refinement and development of water policies in NSW. This framework provides the basis for developing similar monitoring programs.
Tipo: Conference Paper or Presentation
Palavras-chave: Monitoring; Irrigation Industry; Water Sharing Plans; Economic and Social Indicators; Methodology; Participatory Approach; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6001

Speaking Stata: Smoothing in various directions
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Identifying patterns in bivariate data on a scatterplot remains a basic statistical problem, with special avor when both variables are on the same footing. Ideas of double, diagonal, and polar smoothing inspired by Cleveland and McGill’s 1984 paper in the Journal of the American Statistical Association are revisited with various examples from environmental datasets. Double smoothing means smoothing both y given x and x given y. Diagonal smoothing means smoothing based on the sum and difference of y and x that treats the two variables symmetrically, possibly under standardization. Polar smoothing is based on the transformation from Cartesian to polar coordinates followed by smoothing and then reverse transformation; here the smoothing is implemented by...
Tipo: Journal Article
Palavras-chave: Exploratory data analysis; Statistical graphics; Bivariate data; Double smoothing; Doublesm; Diagonal smoothing; Diagsm; Polar smoothing; Polarsm; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117548

Implementing matching estimators for average treatment effects in Stata
Provedor de dados: 31
Autores: Abadie,   Alberto; Drukker,   David M.; Herr,   Jane Leber; Imbens,   Guido W.
This paper presents an implementation of matching estimators for average treatment effects in Stata. The nnmatch command allows you to estimate the average effect for all units or only for the treated or control units; to choose the number of matches; to specify the distance metric; to select a bias adjustment; and to use heteroskedastic-robust variance estimators.
Tipo: Journal Article
Palavras-chave: Nnmatch; Average treatment effects; Matching; Exogeneity; Unconfoundedness; Ignorability; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116250

Using focus groups to design a choice modelling questionnaire for estimating natural resource management benefits in NSW
Provedor de dados: 31
Autores: Mazur,   Kasia; Bennett,   Jeffrey W.
In this study, focus group discussions were used to design a choice modelling (CM) questionnaire to estimate community wide values for the environmental and social benefits provided by natural resource management changes in the Namoi, Lachlan and Hawkesbury-Nepean catchments. This report describes the logistics of the focus groups and outlines the main conclusions drawn from the discussions. The research team conducted eight focus groups in the main urban areas of the regions where the CM survey will be conducted (Tamworth, Cowra, Goulburn and Sydney). How the CM questionnaire was developed with focus group participant input is also discussed in the report. The focus group meetings resulted in a draft questionnaire to be refined in consultation with...
Tipo: Report
Palavras-chave: Focus groups; Choice modelling; Questionnaire design; Natural resource management.; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/94801

Comparison of several demand systems
Provedor de dados: 31
Autores: Meyer,   Stefan; Yu,   Xiaohua; Abler,   David G.
Using Monte-Carlo simulation, , we compare the most popular demand systems including the LES, AIDS, BTL, QES, QUAIDS and AIDADS, and find that different models actually have different advantages in estimating different elasticities. Specifically, QES, AIDS and AIDADS models are the best in income, own-price and cross-price elasticities, respectively. Overall, AIDADS model has the best performance. The results indicate that the rank three models are not necessary always better than the rank two models.
Tipo: Conference Paper or Presentation
Palavras-chave: Comparison; Demand Systems; Monte Carlo; AIDS; Consumer/Household Economics; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103736

Speaking Stata: Time of day
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Many problems in statistical analysis include time-of-day variables, but Stata offers limited support for time-of-day calculations. Support is needed for dates with times, times alone, and durations or timings. This article presents two new programs as general utilities to convert back and forth between string and numeric representations.
Tipo: Journal Article
Palavras-chave: Ntimeofday; Stimeofday; Time of day; Time series; Calendar; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117562

Stata tip 17: Filling in the gaps
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117506

An Empirical Investigation of Interproduct Relationships Between Domestic and Imported Seafood in the U.S.
Provedor de dados: 31
Autores: Lee,   Young-Jae; Kennedy,   P. Lynn.
This study seeks to identify interproduct relationships between domestic catfish and a representative selection of imported seafood. In doing so, this study uses multivariate cointegration and structural analyses. Multivariate cointegration analysis suggests that six imported seafood product groupings form a common market with domestic catfish. Structural analysis reveals that 1) domestic and imported catfish are net and gross quantity substitutes; 2) domestic catfish and imported seafood are normal goods; 3) six imported seafood products are identified as gross quantity substitutes for domestic catfish; and 4) according to the derived Allais coefficients, interaction intensities of imported seafood for domestic catfish (from greatest to least) are as...
Tipo: Journal Article
Palavras-chave: Catfish; Multivariate cointegration; Quantity substitutability; Seafood imports; Structural analysis; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Demand and Price Analysis; Environmental Economics and Policy; Financial Economics; Health Economics and Policy; International Relations/Trade; Livestock Production/Industries; Marketing; Political Economy; Production Economics; Productivity Analysis; Public Economics; Research Methods/ Statistical Methods; D12; F10; F11; F13.
Ano: 2010
URL: http://purl.umn.edu/100516

MEASURING CROSS-SUBSIDISATION OF THE SINGLE PAYMENT SCHEME IN ENGLAND
Provedor de dados: 31
Autores: Renwick,   Alan W.; Revoredo-Giha,   Cesar.
The specific purpose of this paper is to estimate the extent to which decoupled payments under the Single Payments Scheme (SPS) are being used (either explicitly or implicitly) in England to support the continuation of activities that were previously supported by area and headage payments. In the absence of a farm survey, the methodology consists of using information on farm accounts collected through England’s Farm Business Survey (FBS), to estimate a multi-output cost function differentiated by farm size and farm type. This cost function, calibrated to match regional prices in England, is used to estimate the level of cross-subsidisation in the first full year after implementation of the SPS (2005/06). Results indicate that cross-subsidisation was...
Tipo: Conference Paper or Presentation
Palavras-chave: English agriculture; Single farm payment; Micro-econometric models.; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q12; Q18.
Ano: 2008
URL: http://purl.umn.edu/44783

Phase Space Reconstruction from Time Series Data: Where History Meets Theory
Provedor de dados: 31
Autores: Huffaker,   Ray G.
In ‘dissipative’ dynamical systems, variables evolve asymptotically toward low‐dimensional ‘attractors’ that define their dynamical properties. Unfortunately, real‐world dynamical systems are generally too complex for us to directly observe these attractors. Fortunately, there is a method—‘phase space reconstruction’—that can be used to indirectly detect attractors in real‐world dynamical systems using time series data on a single variable (Broomhead and King, 1985; Schaffer and Kott, 1985; Kott et al, 1988; Williams,1997). Armed with this knowledge, we can formulate more accurate and informative models of real‐world dynamical systems. We begin by introducing the concept of phase space attractors within the context of a dynamic ISLM model. We next...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100455

EVALUATING ALTERNATIVE FARMING SYSTEMS: A FUZZY MADM APPROACH
Provedor de dados: 31
Autores: Marks,   Leonie A.; Dunn,   Elizabeth G.
This paper develops a decision support method that integrates measures of achievement in the economic, environmental, and social aspects of farming.  The decision support method combines multiple attribute decision making (MADM) with fuzzy logic.  The fuzzy MADM model fully ranks decision alternatives relative to the preferences of decision makers and overcomes several problems inherent in other MADM approaches.  It is concluded that fuzzy MADM can improve decision making on the farm.
Tipo: Conference Paper or Presentation
Palavras-chave: Fuzzy logic; Fuzzy sets; Multiple attribute decision making; MADM; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21642

Methods for selecting the optimal dynamic hedge when production is stochastic
Provedor de dados: 31
Autores: Karp,   Larry S.
A dynamic hedging problem with stochastic production is solved. The optimal feedback rules recognize that future hedges will be chosen optimally based on the most current information. The resulting distribution of revenue is analyzed numerically. This analysis enables the hedger to select his appropriate level of risk aversion.
Tipo: Working or Discussion Paper
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/6092

DUMMY VARIABLES AND THE STATISTICAL EFFICIENCY OF THE ESTIMATORS
Provedor de dados: 31
Autores: Soliman,   M.A.
This paper is concerned with investigating the efficiency of estimators using dummy variables relative to the efficiency of the estimators obtained from "separate" functions. First the advantages of using dummy variables are discussed. Second, the proof of the efficiency criteria of estimators obtained using the dummy variables is developed. Third, the consequences of using dummy variables when the variance by season is different are discussed. Finally, a simple case is shown.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1969
URL: http://purl.umn.edu/13654

How integrative modelling can break down disciplinary silos
Provedor de dados: 31
Autores: Kragt,   Marit Ellen; Robson,   Barbara J.; Macleod,   Christopher J.A.
This paper has been published in a peer-reviewed journal as:  Kragt, M.E., Robson, B.J. &amp; Macleod, C.J.A. (2013) Modellers’ roles in structuring integrative research projects. Environmental Modelling &amp; Software, 39(1): 322-330.  DOI: 10.1016/j.envsoft.2012.06.015
Tipo: Working or Discussion Paper
Palavras-chave: Environmental modelling; Interdisciplinary research; Transdisciplinarity; Integration; Research Methods/ Statistical Methods; Q57; Y80; Z19.
Ano: 2011
URL: http://purl.umn.edu/108768

Suggestions for the Road to Copenhagen
Provedor de dados: 31
Autores: Karp,   Larry S.; Zhao,   Jinhua.
We provide a unified discussion of the issues that confront negotiators of the next international climate agreement. We offer a novel proposal that entitles countries to discharge their treaty obligations by paying a “fine”. This escape clause provides cost insurance, simplifies the problem of enforcing compliance, and increases incentives to participate in the agreement. We explain why developed country obligations should rely on a cap and trade commitment rather than carbon taxes. A Central Bank maintains stability of carbon prices by defending a price ceiling and floor. An so-called intensity target is not a good alternative to an emissions cap. Modest trade restrictions, consistent with WTO law, will form an important part of the next agreement....
Tipo: Working or Discussion Paper
Palavras-chave: Kyoto protocol; Escape clause; Emissions trade; Taxes versus cap and trade; Price stability; Carbon leakage; Trade restrictions; Differentiated responsibility; Clean development mechanism; Sectoral agreements; Demand and Price Analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Q54; Q58; F13.
Ano: 2009
URL: http://purl.umn.edu/51610

The Gravity Model and the Problem of Zero`s in Agrifood Trade
Provedor de dados: 31
Autores: Haq,   Zahoor Ul; Meilke,   Karl D.; Cranfield,   John A.L.
and this is a problem when estimating log-linear gravity equations. This has caused many researchers to either ignore the zero trade flows or to replace the zero with a small positive number. Both of these actions bias the resulting parameter estimates of the gravity equation. In this study we correct for this misspecification by using the Heckman selection model to estimate bilateral trade flows for 46 agrifood products, for the period 1990 to 2000, for 52 countries. In our sample, selection bias rarely affects the signs of variables but often has a substantial effect on the magnitude, statistical significance and economic interpretation of the marginal effects. Hence, treating zero trade flows properly is important from both a statistical and an...
Tipo: Working or Discussion Paper
Palavras-chave: Gravity model; Selection bias; Agrifood Trade; Heckman Selection Model; Marginal effects; Agricultural and Food Policy; Demand and Price Analysis; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/116851

Competitive Analysis and Market Power of China’s Soybean Import Market
Provedor de dados: 31
Autores: Song,   Baohui; Marchant,   Mary A.; Reed,   Michael R.; Xu,   Shuang.
This research conducts a competitive structure analysis of the Chinese soybean import market which leads to the hypothesis that China’s soybean importers may have stronger market power in China’s soybean import market. Then, this research develops and simultaneously estimates a two-country partial equilibrium trade model to test U.S.-China market power of soybean trade. The empirical result supports our hypothesis that Chinese soybean importers have stronger market power relative to U.S. soybean exporters. This Chinese market power can be countered by U.S. and South American companies through developing new and expanding existing markets for soybeans throughout the world and investing in Chinese soybean storage and crushing capacity.
Tipo: Journal Article
Palavras-chave: Chinese soybean import market; Competitive structure analysis; Market power; Two-country partial equilibrium trade model; International Relations/Trade; Marketing; Research Methods/ Statistical Methods; Q10; Q12; Q17.
Ano: 2009
URL: http://purl.umn.edu/53744

Speaking Stata: How to repeat yourself without going mad
Provedor de dados: 31
Autores: Cox,   Nicholas J.
This column will focus on how to improve your fluency in Stata. Over the next issues we will look at Stata problems of intermediate size which turn out to be soluble with a few command lines. As an introduction, systematic ways of repeating the same or similar operations are surveyed to give one overview of the territory to be covered.
Tipo: Journal Article
Palavras-chave: Append; By; Collapse; Contract; Do-files; Egen; For; Foreach; Forvalues; Log files; Merge; Naming conventions; Programs; Repetition; Reshape; Statsby; Subset or group structure; Tabulations; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115938

Generating Halton sequences using Mata
Provedor de dados: 31
Autores: Drukker,   David M.; Gates,   Richard.
This paper discusses the advantages of Halton sequences over pseudorandom uniform numbers when using simulation to approximate integrals numerically. We describe two types of sequences and give Mata examples. Finally, we document the Mata function halton(), currently in release 9.1 of Stata, which computes both a Halton sequence and its Hammersley variant. Options to use these point sets are available in the Stata 9 program asmprobit, a multinomial-probit estimator, and in the Stata 9.1 Mata function ghk(), the Geweke–Hajivassiliou–Keane multivariate-normal simulator.
Tipo: Journal Article
Palavras-chave: Halton(); Halton set; Hammersley set; Quasirandom numbers; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117570

Long-Run Trends in the Farm Size Distribution in Israel: The Role of Part-Time Farming
Provedor de dados: 31
Autores: Kimhi,   Ayal; Tzur,   Nitzan.
This article proposes a nonparametric analysis in which the change in the distribution of farm size between two periods is decomposed into several components, and the contributions of subgroups of farms to this change are analyzed. Using data on Israeli family farms, we analyze the changes in the farm size distribution in two separate time periods that are characterized by very different market conditions, focusing on the different contributions of full-time farms and part-time farms to the overall distributional changes. We find that between 1971 and 1981, a period characterized by stability and prosperity, the farm size distribution has shifted to the right with relatively minor changes in higher moments of the distribution. On the other hand, between...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/99217

BANDWIDTH SELECTION FOR SPATIAL HAC AND OTHER ROBUST COVARIANCE ESTIMATORS
Provedor de dados: 31
Autores: Lambert,   Dayton M.; Florax,   Raymond J.G.M.; Cho,   Seong-Hoon.
This research note documents estimation procedures and results for an empirical investigation of the performance of the recently developed spatial, heteroskedasticity and autocorrelation consistent (HAC) covariance estimator calibrated with different kernel bandwidths. The empirical example is concerned with a hedonic price model for residential property values. The first bandwidth approach varies an a priori determined plug-in bandwidth criterion. The second method is a data driven cross-validation approach to determine the optimal neighborhood. The third approach uses a robust semivariogram to determine the range over which residuals are spatially correlated. Inference becomes more conservative as the plug-in bandwidth is increased. The data-driven...
Tipo: Working or Discussion Paper
Palavras-chave: Spatial HAC; Semivariogram; Bandwidth; Hedonic model; Community/Rural/Urban Development; Demand and Price Analysis; Land Economics/Use; Research Methods/ Statistical Methods; C13; C31; R21.
Ano: 2008
URL: http://purl.umn.edu/44258

Speaking Stata: Problems with tables, Part I
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tables in some form or another are part and parcel of data management and analysis. The main general-purpose tabulation commands, tabulate, table, and tabstat, are reviewed and compared. When these do not provide a tabulation solution, one key strategy is to prepare the material for tabulation as a set of variables, after which the table itself can be presented with tabdisp or list. This is the first of two papers on this topic.
Tipo: Journal Article
Palavras-chave: Tables; Tabulate; Table; Tabstat; Tabdisp; List; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116122

PRESSURE FACTORS AFFECTING LOMBARDY AGRICULTURAL SYSTEM: THE ENVIRONMENTAL CONSEQUENCES OF THE FISCHLER REFORM
Provedor de dados: 31
Autores: Bulgheroni,   Claudia; Sali,   Guido.
This paper presents a regional model, based on Positive Mathematical Programming, which aims to evaluate the consequences of Fischler reform on the agricultural sector of the Lombardy irrigated lowland (Northern Italy). The model main focus is to quantify the agricultural land use changes due to the farmers reaction to the CAP reform main issues, such as single payment, and to simulate possible scenarios for the future. The model takes into account also the Water Frame Directive principles, in order to combine the assessment of both CAP issues and the potential irrigation water supplies reduction, which could deeply affect the area. The model input are obtained by means of the integration between FADN and SIARL (Agricultural Information System of Lombardy...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP modelling; Fischler Reform; Positive Mathematical Programming; Regional model; Water Frame Directive; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q18; Q15; C61.
Ano: 2008
URL: http://purl.umn.edu/44827

General Pattern Formation in Recursive Dynamical Systems Models in Economics
Provedor de dados: 31
Autores: Brock,   William A.; Xepapadeas,   Anastasios.
This paper presents a fairly general treatment of recursive infinite horizon forward looking optimizing systems on infinite dimensional spatial domains. It includes optimal control, an analysis of local stability of spatially flat optimal steady states and development of techniques to compute spatially heterogeneous optimal steady states. The paper also develops a concept of rational expectations equilibrium, a local stability analysis for spatially homogeneous rational expectations steady states, and computational techniques for spatially heterogeneous rational expectations steady states.
Tipo: Working or Discussion Paper
Palavras-chave: Pattern Formation; Spatial Spillovers; Optimal Control; Spillover Induced Instability; Growth Models; Research Methods/ Statistical Methods; C61; 041.
Ano: 2009
URL: http://purl.umn.edu/52345

THE MARGINAL COST OF AGRI-ENVIRONMENTAL SERVICES
Provedor de dados: 31
Autores: Sauer,   Johannes; Wossink,   Ada.
A3_2
Tipo: Conference Paper or Presentation
Palavras-chave: Agri-environmental services; Bio-economic modelling; Economies of scale and scope; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Q18; Q57; Q58.
Ano: 2010
URL: http://purl.umn.edu/93939

Spatially explicit farming system modelling for an efficient agri-environmental policy design
Provedor de dados: 31
Autores: Havlik,   Petr; Bamiére,   Laure; Jacquet,   Florence; Millet,   Guy.
A mathematical programming model is developed and associated to a spatial pattern index (Ripley L-function) to analyse the optimal reserve design and implementation for the Little Bustard conservation in Plaine de Niort. The model structure corresponds to three spatial levels, fields, farm and landscape. Simple in terms of area representation it is detailed in term of farm behaviour and spatially explicit. The model is applied in a normative and in a positive way. The major findings of the normative approach relate to the trade-offs between the reserve pattern and its cost. It was found that the environmentally optimal reserve, which is randomly dispersed across the zone, is the most costly one. Within the positive approach, it is illustrated that the...
Tipo: Conference Paper or Presentation
Palavras-chave: Biodiversity; Spatial optimization; Mathematical programming; Agri-environmental policies; Tetrax tetrax; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6676

A HIERARCHICAL BAYES APPROACH TO MODELING CHOICE DATA: A STUDY OF WETLAND RESTORATION PROGRAMS
Provedor de dados: 31
Autores: Eisen-Hecht,   Jonathan I.; Kramer,   Randall A.; Huber,   Joel.
This study examines the factors the influence the values and importance that landowners place on the attributes of voluntary wetland restoration programs.  Choice-based conjoint analysis, a stated preference method, was used to estimate the marginal utilities and values for restoration program attributes for North Carolina landowners.  Landowner preferences were estimated at individual and aggregate levels to examine the importance of modeling heterogeneous preferences.  Choice modeling performed at both aggregate and individual levels demonstrated the information gains from a disaggregated approach.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20253

OPTIMAL PEST CONTROL IN FLORICULTURE PRODUCTION OF ORNAMENTAL CROPS
Provedor de dados: 31
Autores: Schumacher,   Sara K.; Marsh,   Thomas L.; Williams,   Kimberly A.
We develop a conceptual bioeconomic model of floriculture production, wherein optimal decision rules depend on an intertemporal economic objective to maximize profits subject to economic and biological processes.  The necessary conditions highlight intertemporal tradeoffs between aesthetic benefits and expected future net benefits of insect stocks, which have important policy implications.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35025

Food Systems: A Multidisciplinary Approach to Analysis and Learning
Provedor de dados: 31
Autores: Duncan,   Jessica; Hatt,   Ken.
This paper introduces an innovative, interdisciplinary food systems programme based on an open‐source pedagogical model that facilitates learning through the use of technology developed at the Universitat Oberta de Catalunya (UOC). We begin by explaining the structure and goals of the UOC and briefly introduce the UOC’s e‐learning model. We then consider the development of the Department of Food Systems, Culture and Society and explain our rational for focussing on food governance. We focus primarily on a set of mandatory introductory courses for the Master’s Diploma in Food, Society and International Food Governance. These courses, which make up a certificate in Food Systems Analysis, lay out the fundamentals of our approach to the study of food systems....
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100588

A GAME THEORY ANALYSIS OF MANAGEMENT STRATEGIES FOR THE SOUTHERN BLUEFIN TUNA INDUSTRY
Provedor de dados: 31
Autores: Klieve,   H. M.; MacAulay,   T. Gordon.
Game theory offers an alternative approach to standard means of resource assessment which can be of value in the definition and assessment of policy options for competing parties. Using a Nash co-operative game it has been possible in this paper to show the significance of fishing strategies for southern bluefin tuna which take into account the age distribution of the catch. Assuming Japan and Australia act according to a cooperative game then the optimal fishing strategy was found to involve Australia avoiding the fishing of the very young cohorts and Japan taking a moderate catch in subsequent older age classes but not the oldest of the age classes. Sub-optimal strategies were also presented and evaluated along with an indication of the level of biomass...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/22384

IMPACT ASSESSMENT OF THE 2003 CAP REFORM AND THE NITRATE DIRECTIVE ON THE ARABLE FARMING SYSTEM IN THE MIDI-PYRÉNÉES REGION: BIO-ECONOMIC MODELING AT FIELD, FARM AND REGIONAL LEVELS
Provedor de dados: 31
Autores: Louhichi,   Kamel; Belhouchette,   Hatem; Wery,   Jacques; Therond,   Olivier; Flichman,   Guillermo.
This paper analyses the impact of the 2003 CAP reform (the so-called Fischler Reform) and its interaction with the Nitrate Directive on the sustainability of selected arable farming systems in a French region (Midi-Pyrénées). The Nitrate Directive is one of the oldest EU environmental programs designed to reduce water pollution by nitrate from agricultural sources, through a set of measures, defined at regional level, and mandatory for farmers of vulnerable zones. This impact analysis is performed through a bio-economic modelling framework coupling the crop model CropSyst and the farm-based model FSSIM developed, within the EU FP6 SEAMLESS project (Van Ittersum et al., 2008). The 2003 CAP reform was compared first to the continuation of Agenda 2000...
Tipo: Conference Paper or Presentation
Palavras-chave: Integrated assessment; Agricultural Policy; Nitrate Directive; Bioeconomic modelling; Multi-scale analysis.; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q18; Q52; Q58.
Ano: 2008
URL: http://purl.umn.edu/44826

DICHOTOMOUS-CHOICE, CONTINGENT-VALUATION QUESTIONS: FUNCTIONAL FORM IS IMPORTANT
Provedor de dados: 31
Autores: Boyle,   Kevin J.
A variety of questioning formats have been used in contingent-valuation studies, with dichotomous-choice questions becoming the preferred format.  However, as with any empirical technique, continued applications raise questions that require attention if the credibility of the procedure is to be maintained.  It is shown that estimated Hicksian surplus can be substantially affected by the selection of a functional form when analyzing responses to dichotomous-choice questions.  Given that theory, intuition, and empiricism all play a role in developing these estimates, several maxims are suggested for evaluating and/or mitigating such effects in future studies.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/29039

Análise das flutuações econômicas no Brasil, de 1991 a 2008, a partir dos modelos RBC
Provedor de dados: 31
Autores: Duda,   Fabricio; Sampaio,   Armando Vaz.
Fluctuation Economic research grow up from 80’s with the Dynamic Stochastic General Equilibrium Models (DSGE), where the agent are search for the optimum point at the intertemporal decisions, that is decision over time of how consumers make choice between present and future consumption at the uncertain environment. The real business cycles (RBC) are example this kind of DSGE models. The objectives of the paper are understands the theoretical structure of the RBC model and compare it with the Brazilian economy. The economic real showed that consumption and investment are pro-cyclic and the investment is more volatile than the consumption, the real wage and paid hours were pro-cyclic, where this second variable was more volatile. The artificial economic was...
Tipo: Journal Article
Palavras-chave: Real business cycles; Aggregate fluctuations; Brazil; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/56850

BEYOND MOBILITY: THE ROLE OF FUZZY ACCESS RIGHTS AND COMMON PROPERTY CONSIDERATIONS IN SEMI-ARID AFRICAN PASTORALIST SYSTEMS
Provedor de dados: 31
Autores: Goodhue,   Rachael E.; McCarthy,   Nancy.
We model the ill-defined nature of grazing access using fuzzy set theory.  We also model common property considerations.  Within this framework, we examine when the traditional system results in higher returns and/or lower variance for herders than land privatization or a standard common property regime.
Tipo: Conference Paper or Presentation
Palavras-chave: Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20801

Prediction of the Cultivated Land Demand Based on Logistic Equation - A Case of Zhejiang Province, China
Provedor de dados: 31
Autores: Qiao,   Ruibo; Li,   Yu-ping; Cai,   Yunlong.
Regional situation of Zhejiang Province and connotation of Logistic Equation are introduced. According to the relevant statistical data from 1978 to 2006, dynamic change and its driving forces of cultivated land area in Zhejiang Province are analyzed. ① Since the year 1978, cultivated land area has shown a significant fluctuant decreasing trend in Zhejiang Province, China. ② Cultivated land at the two stages of 1984-1988 and 1990-1995 decreases sharply. Large area of cultivated land is occupied by non-agricultural construction. ③ Economic development, population growth and agricultural scientific and technological development are the main driving forces. Contradiction between land and human beings becomes more acute; and the load of cultivated land becomes...
Tipo: Thesis or Dissertation
Palavras-chave: Logistic Equation; Cultivated land demand; Prediction; Zhejiang Province; China; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/55907

Modeling U.S. Soy-Based Markets with Directed Acyclic Graphs and Time Series Econometrics: Evaluating the U.S. Market Impacts of High Soy Meal Prices
Provedor de dados: 31
Autores: Babula,   Ronald A.; Bessler,   David A.; Reeder,   John; Somwaru,   Agapi.
This paper demonstrates the application of a recently developed methodology, the combination of directed acyclic graphs (DAGs) with Bernanke structural vector autoregression (VAR) models, to model a system of U.S. commodity-related and value-added markets. As an example, the paper applies this methodology to a monthly system of three U.S. soy-based markets: the soybean market upstream and the two downstream markets for soy meal soy oil. Analyses of results from simulating the model's impulse response function and of forecast error variance decompositions provide updated estimates of market elasticity parameters that drive these markets, and updated policy-relevant information on how these monthly markets run and dynamically interact. Results suggest how a...
Tipo: Working or Discussion Paper
Palavras-chave: Directed acyclic graphs; Bernanke structural VAR models; Monthly soy-based markets; Industrial Organization; Marketing; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/15885

Utilization-focused evaluation for agricultural innovation
Provedor de dados: 31
Autores: Patton,   Michael Quinn; Horton,   Douglas.
Utilization-focused evaluation (UFE) is based on the principle that an evaluation should be judged by its utility. So no matter how technically sound and methodologically elegant, an evaluation is not truly a good evaluation unless the findings are used. UFE is a framework for enhancing the likelihood that evaluation findings will be used and lessons will be learnt from the evaluation process. This Brief, based on the book Utilization-focused evaluation, introduces this approach to evaluation, outlines key steps in the evaluation process, identifies some of the main benefits of UFE, and provides two examples of UFE in the context of programmes aimed at promoting agricultural innovation.
Tipo: Report
Palavras-chave: Evaluation; Utilization; UFE; Innovation; Agricultural and Food Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/52533

Demand and price volatility: rational habits in international gasoline demand
Provedor de dados: 31
Autores: Scott,   K. Rebecca.
The combination of habits and a forward outlook suggests that consumers will be sensitive not just to prices but to price dynamics. In particular, rational habits models suggest 1. that price volatility and uncertainty will reduce demand for a habit-forming good and 2. that such volatility will dampen demand’s responsiveness to price. These two implications can be tested by augmenting a traditional partial-adjustment or error-correction model of demand. I apply this augmented model to data on gasoline consumption, as rational habits provide a succinct representation for the investment and behavioral decisions that determine gasoline usage. The trade-o¤s among 2SLS, system GMM, and pooled mean group (PMG) estimators are considered, and my preferred PMG...
Tipo: Working Paper
Palavras-chave: Gasoline demand; Rational habits; Price elasticity; Research Methods/ Statistical Methods; H30; Q40; Q41; Q50; R40.
Ano: 2012
URL: http://purl.umn.edu/122891

Bewertung nicht-marktfähiger Leistungen der Landwirtschaft – eine Herausforderung für die Forschung
Provedor de dados: 31
Autores: Holm-Muller,   Karin.
Tipo: Journal Article
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/98079

The Value of Private Risk Versus the Value of Public Risk: An Experimental Analysis of the Johannesson et al. Conjecture
Provedor de dados: 31
Autores: Messer,   Kent D.; Poe,   Gregory L.; Schulze,   William D.
In 1996 Johannesson et al. published a paper in this journal entitled “The Value of Private Safety versus the Value of Public Safety.” Based on preliminary evidence from a hypothetical contingent valuation study, these authors argue that consumers behave as “pure altruists” and reject the notion of paternalistic preferences for safety in a coercive tax setting. These pure altruists consider the cost of a program that might be imposed on other voters when they decide whether to vote for or against public safety programs. The authors conclude that further empirical research in this area is warranted. This paper presents a set of laboratory economics experiments to test Johannesson et al.’s conjecture under controlled conditions in which participants face an...
Tipo: Working or Discussion Paper
Palavras-chave: Altruism; Risk; Voting; Public goods; Research Methods/ Statistical Methods; Risk and Uncertainty; D81; D64; H41; C91; C92; D72.
Ano: 2008
URL: http://purl.umn.edu/51141

Social science perspectives on managing agricultural technology
Provedor de dados: 31
Experiences of 15  social science research fellows who recount their roles in particular research projects at the International Agricultural Research Centers they were appointed. In addition to highlighting the contributions social scientists can make in the field of agricultural research, their papers offer a candid look at the kinds of work in which the Centers currently are engaged.
Tipo: Book
Palavras-chave: Technology; Agricultural research; Resource management; Farmer participation; Evaluation; Farm Management; Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/113863

RETURNS TO SCALE AND SIZE IN AGRICULTURAL ECONOMICS: REPLY
Provedor de dados: 31
Autores: McClelland,   John W.; Wetzstein,   Michael E.; Musser,   Wesley N.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/32157

NUMERAIRE CHOICE IN AGRICULTURAL SUPPLY ANALYSIS
Provedor de dados: 31
Autores: Paudel,   Krishna P.; McIntosh,   Christopher S.
Economic theory provides little guidance for selecting a numeraire in estimating dual function profit functions.  In this study, we examine the choice of numeraire price (equation) for profit function models of Iowa agriculture.  The choice of numeraire is evaluated by forecasting accuracy and with a non-nested specification test.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20962

Selected approaches of variables weighting in frame of composite indicator analysis
Provedor de dados: 31
Autores: Hlavsa,   Tomas.
Composite indicators are useful as tool for complex evaluation and aggregation of different variables of regional development. Variables which are aggregated in a composite indicator have first to be weighted. All variables may be given equal weights or they mea be given differing weights which reflect the significance, reliability or other characteristics of the underlying data. The weights given to different variables heavily influence the outcomes of the composite indicator. Aim of this paper is an evaluation of selected methods for weighting of particular variables in frame of composite indicator construction. Evaluation is verified on group of regional economic variables based on Strategy of regional development.
Tipo: Journal Article
Palavras-chave: Composite indicator; Region; Principal component analysis; Expert; Community/Rural/Urban Development; Research Methods/ Statistical Methods; GA; IN.
Ano: 2010
URL: http://purl.umn.edu/99082

The Pattern of Livelihoods in a Typical Rural Village Provides New Perspectives on Botswana's Development
Provedor de dados: 31
Autores: Moepeng,   Pelotshweu T.; Tisdell,   Clement A.
Botswana’s average economic growth rate of about 8 per cent during 1985-2005 is one of highest in the world. A major contributor of this growth was mining which, in 2005/06, had a 41.4 per cent share of GDP. Various government welfare and empowerment programmes indicate that redistribution of the mineral wealth is widespread in Botswana. This article will show that the pattern of livelihoods in a typical rural village has changed and provide new perspectives on Botswana’s development. In particular, the article will show that contrary to expectations, agriculture is no longer a major source of income to the rural economy but income transfers from out migrants members of rural based households. It will also be shown that the proportion of the rural...
Tipo: Working Paper
Palavras-chave: Botswana; Rural poverty; Agriculture; Community/Rural/Urban Development; Food Security and Poverty; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/123548

Protecting the Booroolong Frog in the Namoi Catchment: A Cost-Benefit Analysis
Provedor de dados: 31
Autores: Greyling,   Tertius; Bennett,   Jeffrey W.
The Booroolong frog project in the Namoi Catchment represents an environmental investment to protect the species and around 10.7 kilometres of its habitat in the catchment. The project’s benefit-cost ratio (BCR) of 8.6 indicates that the benefits outweigh the costs by a significant margin. The measures introduced by landholders, at relatively low cost, should therefore result in a significant return on investment upon project completion in 10 years time. The benefits are estimated using a choice modelling study which was recently developed for the valuation of investment in natural resource management in the Namoi Catchment. As this is a largely ex ante cost-benefit analysis, the BCR is subject to uncertainty associated with assumptions which had to be...
Tipo: Report
Palavras-chave: Cost-benefit analysis; Benefit-cost ratio; Choice modelling; Booroolong Frog; Namoi Catchment; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/107851

Investment Decision in Vegetable Oil Extraction Plants in North of Minas Gerais – Brazil: An Application of the Analytic Hierarchy Process in a Biodiesel Production Chain
Provedor de dados: 31
Autores: da Silva Junior,   Aziz Galvao; Perez,   Ronaldo; Boratto,   Metheus.
In line with the social objectives of the PNPB (Brazilian Program of Production and Use of Biodiesel) and its “Social Seal” Framework, PETROBRAS has set up a 57 million liter/year biodiesel plant in the semi‐arid region of North of Minas Gerais State, where the socioeconomics indicators are very unfavorable. Despite the potential to boost the agricultural and agro‐industrial sector, the biodiesel plant is using mainly soybean oil from other regions. Funded by the Minas Gerais Government, the ongoing project aims to contribute to the development of oilseed supply chain in the North of Minas Gerais. To deal with these socioeconomic complex decisions, the Analytic Hierarchy Process (AHP) was used. Organization models were proposed for the following production...
Tipo: Conference Paper or Presentation
Palavras-chave: Biodiesel; Oil extraction; AHP; North of Minas; Agribusiness; Agricultural and Food Policy; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100500

AGRICULTURAL INPUT MARKET SEGMENTS:  WHO IS BUYING?
Provedor de dados: 31
Autores: Alexander,   Corinne E.; Wilson,   Christine A.; Foley,   Daniel H.
Cluster analysis was used to identify five distinct buyer segments for expendable input purchases for U.S. crop and livestock commercial producers.  A multinomial logit model was used to predict segment membership based on demographic, behavioral, and business management factors.  Results provide important information for agricultural input suppliers.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19997

REDUCTION OF STATE VARIABLE DIMENSION IN STOCHASTIC DYNAMIC OPTIMIZATION MODELS WHICH USE TIME-SERIES DATA
Provedor de dados: 31
Autores: Burt,   Oscar R.; Taylor,   C. Robert.
Statistical procedures are developed for reducing the number of autonomous state variables in stochastic dynamic optimization models when these variables follow a stationary process over time.  These methods essentially delete part of the information upon which decisions are based while maintaining a logically consistent model.  The relatively simple linear autoregressive process as well as the general case is analyzed and the necessary formulae for practical application are derived.  Several applications in agricultural economics are discussed and results presented which quantify the relative amount of information sacrificed with the reduction in number of state variables.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/32349

AN APPROACH TO THE ECONOMETRIC ESTIMATION OF ATTITUDES TO RISK IN AGRICULTURE: COMMENT
Provedor de dados: 31
Autores: Bar-Shira,   Ziv.
Bardsley and Harris (1987) test empirically the effects of changes In deterministic wealth and random income on the measure partial risk aversion. The paper, which is otherwise well written, failed to impose the relationship between the two effects and estimated them independently. Consequently, inconsistent estimates were derived for the elasticities of the measure of partial risk aversion with respect to wealth and to income. The purpose of this comment is to derive that relationship theoretically and to point out the resulting inconsistencies in the original paper.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/22624

Entspricht die Schweizer Milchproduktion bei erhöhtem Kraftfuttereinsatz noch den Erwartungen der Bevölkerung?
Provedor de dados: 31
Autores: Mack,   Gabriele; Rossier,   Ruth.
Dieser Beitrag zeigt auf, wie die modellbasierte agrarökonomische Forschung Umfrageergebnisse über die Erwartungen der Bevölkerung an die Agrarpolitik in ihre Analysen mit einbeziehen und für eine verbesserte Beurteilung von politischen Maßnahmen nutzen kann. Am Beispiel verschiedener Politikszenarien (Zollsenkungen auf Kraftfuttermittel in der Schweizer Milchviehhaltung) wird eine Verknüpfung normativer und empirischer Ergebnisse dargestellt und ein Index für die Übereinstimmung einer Maßnahme mit den Erwartungen der betroffenen Bevölkerung gebildet. Die Ergebnisse zeigen, daß die heutigen Kraftfutterpreise für die Milchviehhaltung den Erwartungen der Schweizer Bevölkerung sowie ausgewählter Bevölkerungsgruppen (Produktivitätsorientierte, Ökologiesensible...
Tipo: Conference Paper or Presentation
Palavras-chave: Modellbasierte Politikanalyse; Erwartungsprofil; Ökonomische und ökologische Indikatoren Index-Bildung; Kraftfuttereinsatz; Milchviehhaltung; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53275

Understanding and Using Economic Multipliers (PowerPoint)
Provedor de dados: 31
Autores: Hodges,   Alan W.
Presented to USDA Economists Group, June 18, 2007
Tipo: Conference Paper or Presentation
Palavras-chave: Multiplier; Input-output model; Impact analysis; Florida; Community/Rural/Urban Development; Political Economy; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/43793

Hedging Effectiveness around USDA Crop Reports
Provedor de dados: 31
Autores: Singh,   Navinderpal; McKenzie,   Andrew M.
It is well documented that “unanticipated” information contained in USDA crop reports induces large price reactions in corn and soybean markets. Thus, a natural question that arises from this literature is: To what extent are futures hedges able to remove or reduce increased price risk around report release dates? This paper addresses this question by simulating daily futures returns, daily cash returns and daily hedged returns around report release dates for two storable commodities (corn and soybeans) in two market settings (North Central Illinois and Memphis Tennessee). Various risk measures, including “Value at Risk,” are used to determine hedging effectiveness, and “Analysis of Variance” is used to uncover the underlying factors that contribute to...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6818

Stata tip 38: Testing for groupwise heteroskedasticity
Provedor de dados: 31
Autores: Baum,   Christopher F.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119249

Perceptions and Participation: Mistaken Beliefs, Encouragement Designs, and Demand for Index Insurance.
Provedor de dados: 31
Autores: Mullally,   Conner; Boucher,   Stephen R.; Carter,   Michael R.
Replaced with revised version of paper 07/20/10.
Tipo: Conference Paper or Presentation
Palavras-chave: International Development; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61002

Decision-Making in a Social Welfare Context
Provedor de dados: 31
Autores: Scarborough,   Helen; Burton,   Michael P.; Bennett,   Jeffrey W.
This paper presents analysis of the decision-making strategies adopted by respondents when confronted with potential policy options that include changes in both aggregate levels of welfare and equity in distribution. The analysis is based on the results of a choice experiment designed to estimate intergenerational distributional preferences. Non-linear welfare functions are employed within a conventional conditional logit framework. The heuristics employed by respondents in the stated preference context provide valuable insights into the application of welfare principles by respondents in determining trade-offs between the potential changes in the well-being of different generations.
Tipo: Conference Paper or Presentation
Palavras-chave: Intergenerational Equity; Distribution; Choice modelling; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/47622

Real Options and the WTP/WTA Disparity
Provedor de dados: 31
Autores: Zhao,   Jinhua; Kling,   Catherine L.
We present a real options model of an agent's decision to purchase or sell a good under conditions of uncertainty, irreversibility, and learning over time. Her WTP and WTA contain both the intrinsic value of the good and an option value associated with delaying the decision until more information is available. Consequently, the standard Hicksian equivalence between WTP/WTA and compen-sating and equivalent variation no longer holds. This helps to explain the WTP/WTA disparity often observed in laboratory experiments and surveys because subjects may have limited learning time and opportunities, thus generating option values. In contrast, the disparity may decrease or disappear entirely in real markets since agents are free to choose when to stop gathering...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; D60; D83; C90.
Ano: 1998
URL: http://purl.umn.edu/18416

From Contracts to Networks: New Directions in the Study of Governance of Agro‐Food‐Energy Networks
Provedor de dados: 31
Autores: Zylbersztajn,   Decio.
The debate about the governance of complex systems of production represents a rich branch of the literature of applied organization theory. The particular application to agro‐related networks is a relevant example since agriculture plays new roles in modern society. The core of the analysis is centered in the rationale for allocation of residual decision rights and distribution of the rights regarding the value created. Contributions based in transaction cost economics, resource‐based view, dynamic competences, and incomplete contract theory explore different dimensions related to the allocation of property rights. The question of how joint strategies are defined, and how value added (or subtracted) is shared among network players is still relevant....
Tipo: Conference Paper or Presentation
Palavras-chave: Governance; Networks; Coordination of production; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Political Economy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100479

Sample size and power calculations using the noncentral t-distribution
Provedor de dados: 31
Autores: Harrison,   David A.; Brady,   Anthony R.
The standard formulas for sample size and power calculation, as implemented in the command sampsi, make use of a normal approximation to the t-distribution. When the sample sizes are small, this approximation is poor, resulting in overestimating power (or underestimating sample size). One particular situation in which this is likely to be important is the field of cluster randomized trials. Although the total number of individuals in a cluster randomized trial may be large, the number of clusters will often be small. We present a simulation study from the design of a cluster randomized crossover trial that motivated this work and a command to perform more accurate sample size and power calculations based on the noncentral t-distribution.
Tipo: Journal Article
Palavras-chave: Sampncti; Sample size; Power; Noncentral t-distribution; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116234

The impact of property rates on agricultural land, focusing on Gauteng
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005. This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the other...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58209

Abstraction and Modelling of Agri-Food Chains as Complex Decision Making Systems
Provedor de dados: 31
Autores: Bryceson,   Kim P.; Smith,   Carl S.
Agri-food chains are complex systems involving multiple multifaceted firms usually working together within specific industry sectors (e.g. grains, beef, wool, dairy) to satisfy an increasingly globalised market demand for high value food products. In so doing, the groupings of companies involved in an agri-food chain undertake activities that require multidimensional inter-organisational and cross organisational decision-making in the process of adding value to a raw commodity product through the production, manufacturing and distribution stages of the chain. Additional complexity is added by climate variability which impacts randomly and unpredictably on decision making in every component of the chain. The work outlined in this paper is a pilot...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/49773

QUALITATIVE RESEARCH IN AGRICULTURAL ECONOMICS: PARADIGMS, PURPOSES, AND EVALUATION CRITERIA
Provedor de dados: 31
Autores: Bitsch,   Vera.
The qualitative paradigm is not widely discussed in agricultural economics, although research strategies are applied. The purpose of this contribution is (1) to elaborate on the paradigm of qualitative research; (2) to introduce purposes of qualitative research and provide examples; and (3) to discuss criteria of scientific rigor applicable.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/20718

The impact of property rates on agricultural land, focusing on North West
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005.  This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58208

The 2007 emerging corn price surge revisited – Was it expected or a large surprise?
Provedor de dados: 31
Autores: Schmitz,   Jochen; Ledebur,   Oliver von.
Point forecasts are a common method to classify uncertain future outcomes. In the option price literature the concept of implied volatility is well known. This concept is used to get a forward looking indicator about the future volatility. Nowadays market expectations can be extracted in numerous ways. One of the first articles regarding this topic in the area of exchange rates and interest rates was Sölderlind and Svensson (1997). Extracting market expectations is not only focused on point forecasts. A more ambitious approach is to extract the whole possible range of market expectations out of option prices. This concept is called risk-neutral density (RND). Most agricultural markets undergo some remarkable price movements in the last 4 years. The reasons...
Tipo: Presentation
Palavras-chave: Risk neutral density; Market expectations; Futures prices; Corn market; Agricultural Finance; Financial Economics; Political Economy; Research Methods/ Statistical Methods; Q14; C53; C58; G17.
Ano: 2012
URL: http://purl.umn.edu/123971

INDIRECT UTILITY FUNCTIONS AND TESTABLE CONDITIONS
Provedor de dados: 31
Autores: Detre,   Joshua D.; Foster,   Kenneth A.
We develop testable hypotheses for utility maximization given risk averse producers based on a general specification of the utility function.  This is a direct expansion of the model posed by Pope (1978).  Empirical tests using production data with a translog specification indicate that utility maximization does not always hold.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20087

Introducing Asymmetric Separability in the FAST Multistage Demand System
Provedor de dados: 31
Autores: Bergtold,   Jason S.; Peterson,   Everett B.
This paper determines the set of parametric restrictions required to maintain flexibility under asymmetric weak separability for the flexible and separable translog (FAST) multistage demand system.  Because there is not a unique set of parametric restrictions that ensures separability and the values of the unconditional price and expenditure elasticities depend on the parametric restrictions imposed, the appropriateness of a chosen set of parametric restrictions should be tested empirically.  An empirical example that illustrates how the choice of parametric restrictions affects the estimation results and the functional form of the price and expenditure elasticities is provided.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19497

PRODUCTION INTERRELATIONSHIPS IN SRI LANKAN PEASANT AGRICULTURE
Provedor de dados: 31
Autores: Shumway,   C. Richard; Jegasothy,   Kandiah; Alexander,   William P.
Technical change and the extent to which commodity supplies and input demands are interrelated in Sri Lankan peasant agriculture are explored in this paper. Using a multiple-product dual model, a seemingly unrelated system of product supply and input demand equations is estimated for four crops and four variable inputs. Restrictions based on competitive behaviour and a twice continuously-differentiable production function are maintained in the non-linear least squares estimation. A number of important interrelationships in individual product supplies and input demands are identified, further documenting the need to account for intercommodity production relationships in econometric and simulation studies and in policy formulation. Non-joint production and...
Tipo: Journal Article
Palavras-chave: Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/22575

A FARM LEVEL ANALYSIS OF THE RELATION BETWEEN CAP REFORMS AND LOCAL ENVIRONMENTAL LEGISLATIONS: HOW AND IN WHICH EXTENT FLEMISH DAIRY FARMERS CAN FILL UP EXTRA MILK QUOTA?
Provedor de dados: 31
Autores: Van der Straeten,   Bart; Buysse,   Jeroen; Nolte,   Stephan; Marchand,   Fleur L.; Lauwers,   Ludwig H.; Claeys,   Dakerlia; Van Huylenbroeck,   Guido.
The agricultural policies shift gradually from EU-level organised market interventions to local organised environmental policies. This paper explores the growth possibilities of the Flemish dairy sector with the outlook of a quota abolishment as a case study of this policy shift. The dairy quota policy seems very restrictive for the highly profitable Flemish dairy sector, but the environmental restrictions from the manure regulation can limit the growth of the dairy sector as well. The paper uses a spatial multi-agent simulation model applied to a sample of 40.000 farms to estimate price development of emission rights and their possible impact on the growth of the dairy production. The results show that a higher milk production leads to higher prices for...
Tipo: Conference Paper or Presentation
Palavras-chave: Milk quota; Manure emission rights; Mathematical programming; Flanders; Agricultural and Food Policy; Industrial Organization; Research Methods/ Statistical Methods; C02; C61; L11; Q18.
Ano: 2008
URL: http://purl.umn.edu/44846

Testing environmental and health pesticide use risk indicators. The case of potato production in Boyacá, Colombia
Provedor de dados: 31
Autores: Feola,   Giuseppe; Rahn,   Eric; Binder,   Claudia R.
Tropentag 2010 ETH Zurich, September 14 - 16, 2010 Conference on International Research on Food Security, Natural Resource Management and Rural Development
Tipo: Conference Paper or Presentation
Palavras-chave: Pesticide risk; Indicators; Sustainability; Health; Environment; Colombia; Crop Production/Industries; Environmental Economics and Policy; Health Economics and Policy; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/117650

Recursive Sustainability: Intertemporal Efficiency and Equity
Provedor de dados: 31
Autores: Knapp,   Keith C.
PV-optimality in a capital-resource economy can imply decreasing utility over some portion of the time horizon. Various criteria have been proposed to maintain intergenerational equity defined as nondeclining utility, but these have some limitations and problems. This paper proposes a new welfare criteria incorporating present value to maintain efficiency, and an equity function with convex costs on declining utility. This criterion is economically efficient, time-consistent and recursive. An extension of dynamic programming to multiple value functions is developed to solve this problem. Increasing the equity weight increasingly eliminates declining portions of utility time paths. Sustainability implies increasing consumption in the early time periods and...
Tipo: Conference Paper or Presentation
Palavras-chave: Growth; Environment; Intergenerational equity; Dynamic programming; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21472

Greenhouse Gas Impacts of Ethanol from Iowa Corn: Life Cycle Analysis versus System-wide Accounting
Provedor de dados: 31
Autores: Feng,   Hongli; Rubin,   Ofir D.; Babcock,   Bruce A.
Life cycle analysis (LCA) is the standard approach used to evaluate the greenhouse gas (GHG) benefits of biofuels. However, it is increasingly recognized that LCA results do not account for some impacts including land use changes that have important implications on GHGs. Thus, an alternative accounting system that goes beyond LCA is needed. In this paper, we contribute to the literature by laying out the basics of a system-wide accounting (SWA) method that takes into account all potential changes in GHGs resulting from biofuel expansion. We applied both LCA and SWA to assess the GHG impacts of ethanol based on Iowa corn. Growing corn in rotation with soybeans generated 35% less GHG emissions than growing corn after corn. Based on average corn production,...
Tipo: Conference Paper or Presentation
Palavras-chave: Biofuels; Corn ethanol; Greenhouse gas; Life cycle analysis; System-wide accounting; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6503

A Speculative Bubble in Commodity Futures Prices? Cross-Sectional Evidence
Provedor de dados: 31
Autores: Sanders,   Dwight R.; Irwin,   Scott H.; Merrin,   Robert P.
Recent accusations against speculators in general and long-only commodity index funds in particular, include: increasing market volatility, distorting historical price relationships, and fueling a rapid increase and decrease in commodity inflation. Some researchers have argued that these market participants—through their impact on market prices—may inadvertently prevented the efficient distribution of food aid to deserving groups. Certainly, this result—if substantiated— would counter the classical argument that speculators make prices more efficient and thus improve the economic efficiency of the agricultural and food marketing system. Given the very important policy implications, it is crucial to develop a more thorough understanding of long-only index...
Tipo: Conference Paper or Presentation
Palavras-chave: Commitment’s of Traders; Index funds; Commodity futures markets; Agribusiness; Agricultural Finance; Farm Management; Financial Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53050

THE MARKET AS AN EXPERIMENT: PROBLEMS OF DATA GENERATION
Provedor de dados: 31
Autores: Peterson,   Willis L.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1981
URL: http://purl.umn.edu/13477

Inconsistent responses in the dichotomous choice contingent valuation with follow-up questions
Provedor de dados: 31
Autores: Kang,   Heechan; Haab,   Timothy C.
This essay develops a new method to diagnose inconsistency in dichotomous choice contingent valuation with follow-up questions: in particular, downward bias in the mean WTP. It is shown that the previous methods aimed to explain this inconsistency in responses have ignored statistical inconsistency: non-perfect correlation between the initial and follow-up responses and thus have provided wrong predictions to explain respondents' inconsistency pattern. In addition, from an application of our method, it has been proven that one model can not encompass all other possible inconsistency patterns in responses.  Test results show that the behavioral inconsistency patterns are different both within and between data sets
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21394

Factor Markets in Applied Equilibrium Models: The current state and planned extensions towards an improved presentation of factor markets in agriculture
Provedor de dados: 31
Autores: Shutes,   Lindsay; Rothe,   Andrea; Banse,   Martin.
This paper describes how factor markets are presented in applied equilibrium models and how we plan to improve and to extend the presentation of factor markets in two specific models: MAGNET and ESIM. We do not argue that partial equilibrium models should become more ‘general’ in the sense of integrating all factor markets, but that the shift of agricultural income policies to decoupled payments linked to land in the EU necessitates the inclusion of land markets in policy-relevant modelling tools. To this end, this paper outlines options to integrate land markets in partial equilibrium models. A special feature of general equilibrium models is the inclusion of fully integrated factor markets in the system of equations to describe the functionality of a...
Tipo: Working Paper
Palavras-chave: Factor Markets; Applied Equilibrium Models; Extensions; Community/Rural/Urban Development; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2012
URL: http://purl.umn.edu/122851

Socioeconomic determinants of primary school dropout: The logistic model analysis
Provedor de dados: 31
Autores: Okumu,   Ibrahim Mike; Nakajjo,   Alex; Isoke,   Doreen.
This paper describes the socioeconomic determinants of primary school dropout in Uganda with the aid of a logistic model analysis using the 2004 National Service Delivery Survey data. The Objectives were to establish the; household socioeconomic factors that influence dropout of pupils given free education and any possible policy alternatives to curb dropout of pupils. Various logistic regressions of primary school dropout were estimated and these took the following dimensions; rural-urban, gender, and age-cohort. After model estimation, marginal effects for each of the models were obtained. The analysis of the various coefficients was done across all models. The results showed the insignificance of distance to school, gender of pupil, gender of household...
Tipo: Report
Palavras-chave: School dropouts; Primary education; Education; EPRC; Consumer/Household Economics; Institutional and Behavioral Economics; Labor and Human Capital; Livestock Production/Industries; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/93855

A NOTE ON NONLINEARITY BIAS AND DICHOTOMOUS CHOICE CVM: IMPLICATIONS FOR AGGREGATE BENEFITS ESTIMATION
Provedor de dados: 31
Autores: Souter,   Ray A.; Bowker,   James Michael.
It is a generally known statistical fact that the mean of a nonlinear function of a set of random variables is not equivalent to the function evaluated at the means of the variables.  However, in dichotomous choice contingent valuation studies a common practice is to calculate an overall mean (or median) by integrating over offer space (numerically or analytically) an estimated logit or probit function in which sample mean values for the concomitant variables are used.  We demonstrate this procedure to be incorrect and we statically test the procedure against the correct method for nonlinear models.  Using data resulting in a well-behaved logit model, we reject the hypothesis of congruence between the two means.  Such a finding should be considered in...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/31649

A Multiple Criteria Decision System to Improve Performance of Federal Conservation Programs
Provedor de dados: 31
Autores: Ozgoc-Caglar,   C. Derya; Farnsworth,   Richard L.
The Environmental Quality Incentives Program and other voluntary Federal conservation programs follow a similar approach for enrollment. Consistent with the legislation, agency personnel identify eligibility criteria, suitable conservation practices, and a process to score, rank, and select applications for funding. Our research outlines a formal multiple criteria decision analysis system that is broadly applicable to current Federal conservation programs to score, rank, and enroll applications, and distribute program funds. Then, we apply the decision system to Indiana’s EQIP program using data from 2005. The incorporation of GLEAMS model improved our estimates of water quality impacts by reintroducing the spatial heterogeneity.
Tipo: Conference Paper or Presentation
Palavras-chave: Multiple Criteria Decision Analysis; Federal Conservation Programs; Environmental Quality Incentives Program; GLEAMS; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/5986

Sacrifice, discounting and climate policy: five questions
Provedor de dados: 31
Autores: Karp,   Larry S.
I provide a selective review of discounting and climate policy. After reviewing evidence on the importance of the discount rate in setting policy, I ask whether standard models tend to exaggerate the sacrifices that the current generation needs to undertake in order to internalize climate damages. I then consider whether the risk of catastrophic damage really overwhelms discounting, in the determination of optimal policy. I revisit the question of how we actually think about the distant future.
Tipo: Working or Discussion Paper
Palavras-chave: Climate change; Discounting; Intergenerational conflict; Catastrophic risk; Hyperbolic discounting; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C61; C73; D63; D99; Q54.
Ano: 2009
URL: http://purl.umn.edu/51612

Cumulative incidence estimation in the presence of competing risks
Provedor de dados: 31
Autores: Coviello,   Vincenzo; Boggess,   May.
When competing risks are present, the appropriate estimate of the failure probabilities is the cumulative incidence. stcompet creates new variables containing the estimate of this function, its standard error, and ln(−ln) transformed confidence bounds. Two examples are presented to illustrate the use of the new command and some key features of the cumulative incidence.
Tipo: Journal Article
Palavras-chave: Stcompet; Survival analysis; Competing risks; Cumulative incidence; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116230

Examining the Reliability of Logistic Regression Estimation Software
Provedor de dados: 31
Autores: Mo,   Lijia; Bergtold,   Jason S.; Featherstone,   Allen M.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/90849

ANALYSIS OF IMPACT ON DOMESTIC AGRICULTURE OF WTO MARKET ACCESS POLICY WITH THE HAMI SIMULATION MODEL
Provedor de dados: 31
Autores: Girardin,   Jean.
A simple but new theoretical approach is used to analyse ex-ante the impact of tariff reduction. This methodology is based on the assumption of a constant price relation between each direct substitutable product. No elasticities are needed, but accurate import and domestic prices of the most sensitive and representative product of each tariff line are required. The present contribution forms a partial sector static simulation model that minimises the reduction of domestic production prices for the agricultural sector consecutive of the WTO market access negotiations of the Doha round. Results are shown on two levels whereas one of them provides rapidly a preliminary hierarchy of the sensitive products tariff lines and their optimal number. The second level...
Tipo: Conference Paper or Presentation
Palavras-chave: Maximal domestic price; Sensitive products; Partial Sector Simulation; Market Access Simulation; World Trade Organization; Demand and Price Analysis; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6451

THE USE OF THE GINI RATIO IN MEASURING DISTRIBUTIONAL IMPACTS
Provedor de dados: 31
Autores: Riemenschneider,   Charles H.
Economists often use the Gini Ratio for measuring inequality in income or program benefit distributions without fully understanding the implications and limitations of this statistic.  This paper delineates some of the limitations in the use of the Gini Ratio as it is usually calculated.  It also examines several new techniques for calculating the Gini Ratio which mitigate some of these shortcomings.
Tipo: Thesis or Dissertation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1976
URL: http://purl.umn.edu/11118

Continuing the Tradition: Employing Tested and Emerging Economic Tools in Framing Sustainability Challenges for a Global Economy
Provedor de dados: 31
Autores: Amanor-Boadu,   Vincent; Ross,   R. Brent.
Economists have been successful in bringing their definitional and analytical tools to many of the problems that have confronted society over the past century and more, from Smith’s explanation of how nations produce wealth to Arrow’s explanation of the impossibility of social choice and Keynes’ general theory of money and interest. With the issue of sustainability, we draw on economic agents’ attempts at rational choice under uncertainty to understand the opportunities and challenges. We argue that employing system dynamic modeling approach to the problem could offer careful assessment of the soundness of sustainability strategies.
Tipo: Conference Paper or Presentation
Palavras-chave: Sustainability; Adaptive Management; System Dynamic Modeling; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61619

Grenzeffekte in der Marktintegration bei Mais in Ostafrika: Einsichten aus einem semi-parametrischen Regressionsmodell
Provedor de dados: 31
Autores: Ihle,   Rico; Amikuzuno,   Joseph; von Cramon-Taubadel,   Stephan; Zorya,   Sergiy.
Diese Arbeit analysiert Faktoren, die Einfluß auf das Ausmaß der inländischen und grenz-übergreifenden Integration der Maismärkte Kenias, Tansanias und Ugandas ausüben. Die Stärke der Reaktion der Preise auf Abweichungen von ihren Langzeitgleichgewichtswerten als Maß der Marktintegration und die Determinanten dieser Reaktion werden für 85 Marktpaare von Januar 2000 bis Oktober 2008 untersucht. Zu diesem Zweck wird ein semi-parametrisches partiell-lineares Regressionsmodell genutzt, das imstande ist, den Einfluß der Marktentfernung, der sich als nichtlinear herausstellt, adäquat zu modellieren. Die Ergebnisse der Untersuchung sind kohärent mit der ökonomischen Theorie und von politischem Interesse. Ein Grenzeffekt wird identifiziert, der in dem Sinne...
Tipo: Conference Paper or Presentation
Palavras-chave: Grenzeffekt; Mais; Ostafrika; Räumliche Marktintegration; Semi-parametrische Regression; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53272

Test of Convergence in Agricultural Factor Productivity: A Semiparametric Approach
Provedor de dados: 31
Autores: Paudel,   Krishna P.; Pandit,   Mahesh; Poudel,   Biswo N.
We tested for club convergence in U.S. agricultural total factory productivity using a sigma convergence test. We used the same club of states as used by McCunn and Huffman as well as different states within 10 clubs identified by the cluster analysis. Results showed convergence was evident only in a few club groups. Clusters group identified using a statistical method identified only converging clubs. Variables affecting total factor productivity among states were identified using parametric, semiparametric and nonparametric methods. Semiparametric and nonparametric methods gave a better fit than a parametric method as indicated by the specification test. Our results indicated that health care expenditure, public research and extension investment, and...
Tipo: Conference Paper or Presentation
Palavras-chave: Clubs; Sigma convergence; Cluster analysis; Semiparametric and nonparametric methods; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/104025

Predicting Time Series Turning Points with Arima Models
Provedor de dados: 31
Autores: Miller,   Stephen E.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/116869

Analysis of Multiple Structural Breaks in Relative Farm Prices in the United States, 1913-2003
Provedor de dados: 31
Autores: Jin,   Hyun Joung; Miljkovic,   Dragan.
We analyze the movement of farm prices relative to other commodity prices in the period 1913:1-2003:12, investigating the number and time of structural breaks and discussing likely causes of structural breaks in the relative farm prices.  Bai and Perron's (1998, 2003) multiple structural change test with a dynamic programming algorithm is used.  This test makes it possible to have an efficient computation of the estimates of the break points as global minimizers of the sum of squared residuals.  We find 6 structural breaks when we consider only the mean process and 2 breaks when we consider the mean and autoregressive processes.  Possible causes for these breaks are discussed.
Tipo: Conference Paper or Presentation
Palavras-chave: Farm Prices; Other Commodity Prices; Multiple Structural Breaks; Research Methods/ Statistical Methods; Q11; C22.
Ano: 2005
URL: http://purl.umn.edu/19118

Modelling Policies for Multifunctional Agriculture and Rural Development in a Remote EU Region (Caithness &amp; Sutherland, Scotland, UK)
Provedor de dados: 31
Autores: Bergmann,   Holger; Thomson,   Kenneth J.
A modified version of a system dynamics model constructed for an EU-wide case-study project (TOPMARD) using STELLA software was used to simulate the effects of a number of development scenarios for a remote rural area in Northern Scotland, i.e. Caithness &amp; Sutherland, which is characterised by multifunctional agriculture. In this paper, the context of the modelling work in policy and socioeconomic terms is first described. This is followed by the specification of the model and of the modelling scenarios, one of which relates to the “decommissioning” (run-down) of a major industrial site (Dounreay) within the area. The modelling results are discussed, in terms of regional population, land use, economic and other terms, from 2001 to 2015/2031. Finally,...
Tipo: Conference Paper or Presentation
Palavras-chave: Modelling; Multifunctionality; Input-output; Systems dynamics; Rural policy; Agricultural and Food Policy; Community/Rural/Urban Development; Public Economics; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6596

A review of traditional Hungarian products’ reputation with a special focus on consumer behaviour
Provedor de dados: 31
Autores: Popovics,   Anett.
The quality of traditional and regional products is essentially determined by geography, history and culture. Being protected by a distinctive quality label (based on the geographical origin, traditions and special features) may enhance traditional Hungarian and regional products’ competitiveness. Based on our survey’s questionnaire results (N = 425) (basic statistics, factor and cluster analysis) it can be proved that consumers are able to identify and appreciate Hungarian products. They also highly value traditional quality.
Tipo: Journal Article
Palavras-chave: Traditional Hungarian products; Consumer survey; Reputation; Value added; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/107652

Analyzing distances
Provedor de dados: 31
Autores: Fenty,   Justin.
Gower and Krzanowski (1999) described the analysis of a multivariate dataset that violated the assumptions of normality for multivariate analysis of variance. They developed a method comprising two aspects: a graphical representation of the points in a fewer number of dimensions, known as principal coordinate analysis; and a technique similar to MANOVA except that it was based on partitioning the distances between subjects, rather than sums of squares, and did not assume that the data followed any particular distribution. This article summarizes both aspects of their analysis and describes the Stata pco and aod commands, which perform principal coordinate analysis and analysis of distance.
Tipo: Journal Article
Palavras-chave: Multivariate data; Principal coordinate analysis; Multidimensional scaling; Euclidean distance; Gower's general coefficient of similarity; Eigenvectors; Analysis of distance; MANOVA; Partitioning of squared distance; Randomization tests; Contrasts; Idempotent matrices; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116209

New Directions in Consumer Behaviour Research
Provedor de dados: 31
Autores: Cash,   Sean B.; Goddard,   Ellen W.
Consumer behaviour remains an evolving and fascinating area of research. In this article we highlight some of the current work by Canadian researchers in the areas of enhancing both the quality and application of consumer analysis. The work described below touches upon areas in which not just economic theory and methods, but also the policy process can be improved. The working papers cited here were all presented as part of the principal paper session, “What’s Going on in Consumer Behaviour?” held at the joint meeting of the Canadian Agricultural Economics Society and the Northeastern Agricultural and Resource Economics Association in Halifax, Nova Scotia in June 2004.
Tipo: Journal Article
Palavras-chave: Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/46370

A multivariable scatterplot smoother
Provedor de dados: 31
Autores: Royston,   Patrick; Cox,   Nicholas J.
We present an extension of Sasieni, Royston, and Cox’s bivariate smoother running to the multivariable context. The software aims to provide a picture of the relation between a response variable and each of several continuous predictors simultaneously. This may be a valuable tool in exploratory data analysis, before constructing a more formal multiple regression model.
Tipo: Journal Article
Palavras-chave: Mrunning; Running; Scatterplot smoothing; Multivariable regression analysis; Running line; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117529

Willingness to Pay for Potable Water in the Southeastern Turkey: An Application of both Stated and Revealed Preferences Valuation Method
Provedor de dados: 31
Autores: Bilgic,   Abdulbaki; Eren,   Gunes; Florkowski,   Wojciech J.
We estimate both averting behavior and stated preferences about water quality improvements in the southeastern Anatolian region using reduced form equations. The model reveals that income, education, perception about water features, household living conditions, regional variables are only statistically significant in both the RP and SP data models. The WTP estimate was around 6.43 New Turkish Liras. And also simulation analysis show that increasing income and education foster the willingness-to-pay for treating water, while an increase in bid prices and perception reduce the WTP.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6755

ESTIMATING A MIXED STRATEGY EMPLOYING MAXIMUM ENTROPY
Provedor de dados: 31
Autores: Golan,   Amos; Karp,   Larry S.; Perloff,   Jeffrey M.
Generalized maximum entropy may be used to estimate mixed strategies subject to restrictions from game theory.  This method avoids distributional assumptions and is consistent and efficient.  We use this method to estimate the mixed strategies of duopolistic airlines.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/25072

Homogenous and Heterogenous Contestants in Piece Rate Tournaments: Theory and Empirical Analysis
Provedor de dados: 31
Autores: Vukina,   Tomislav; Zheng,   Xiaoyong.
In this paper we show that sorting different ability contestants in piece rate tournaments into more homogeneous groups alters incentives for agents to exert effort. In particular we show that for a given mean of the tournament group's ability parameters, larger variance (more heterogeneous agents) induces higher optimal effort. This implies that the principal can actually gain from heterogenizing the tournament groups. On the other hand, the effect of this change on growers' welfare is unclear because higher effort leads to higher productivity and hence higher payment, but also increases the cost of effort. Using broiler production contracts settlement data we empirically estimate a fully structural model of a piece rate tournament game with heterogeneous...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6540

PROGRAMMING LANGUAGES: A SHORT HISTORY FOR ECONOMISTS
Provedor de dados: 31
Autores: Nerlove,   Marc.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/28555

Trade Costs and the Gains from Trade in Crop Agriculture
Provedor de dados: 31
Autores: Reimer,   Jeffrey J.; Li,   Man.
Forthcoming in the American Journal of Agricultural Economics.
Tipo: Conference Paper or Presentation
Palavras-chave: Geography; Grains; Trade costs; Trade liberalization; Agricultural and Food Policy; Crop Production/Industries; Demand and Price Analysis; International Development; International Relations/Trade; Marketing; Research Methods/ Statistical Methods; Q17; Q54; F18.
Ano: 2010
URL: http://purl.umn.edu/61169

THE DEVELOPMENT OF THE TEACHING ON AGRICULTURAL MARKETS IN RUSSIA FROM THE 18TH TO THE 20TH CENTURY
Provedor de dados: 31
Autores: Shaikiu,   Doz W.W.; Wandel,   Jurgen.
The transition to market principles in Russia’s agro-food sector forced the country’s agricultural institutes of higher education to adapt their curriculum to the new economic system. This included the introduction of the subject "studies of agricultural markets". The paper shows that until the collectivization of agriculture in the early 1930s Russia did, in fact, have an own tradition in this discipline, which was influenced by well-known Russian economists like Chaynov and Kondratyev.
Tipo: Working or Discussion Paper
Palavras-chave: Россия; Учение о сельскохозяйственных рынках; История науки; Russland; Landwirtschaftliche Marktlehre; Wissenschaftsgeschichte; Russia; Teaching on agricultural markets; History of science.; Institutional and Behavioral Economics; International Development; Political Economy; Public Economics; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession; B 0.
Ano: 2009
URL: http://purl.umn.edu/91765

Indicators
Provedor de dados: 31
Autores: Marti,   Daniel L.; Coleman-Jensen,   Alisha; Nord,   Mark.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/120836

Stata tip 45: Getting those data into shape
Provedor de dados: 31
Autores: Baum,   Christopher F.; Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119275

In the Long Run
Provedor de dados: 31
Autores: Strickland,   Roger.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/124193

MAIL SURVEYS AND NON-RESPONSE BIAS: REPORT ON A N.S.W. MAIL SURVEY
Provedor de dados: 31
Autores: Freebairn,   John W.
All farmers in one stratum of a wheat storage survey who failed to answer a mail questionnaire were personally interviewed. Answers obtained from the mail respondents and from non-respondents are compared to assess the extent of non-response bias. Five suggestions for planning "high return" mail surveys are discussed.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1967
URL: http://purl.umn.edu/22350

TOURNAMENTS, RISK PERCEPTIONS, AND FAIRNESS
Provedor de dados: 31
Autores: Wu,   Steven Y.; Roe,   Brian E.
This paper reports the results of an economic experiment investigating human subjects’' preferences for two types of contracts – tournaments and fixed performance standard contracts. Willingness to pay data was elicited through an auction and results suggest that subjects prefer fixed performance standard contracts to tournaments.  Primary drivers of this result appear to be subjects’' perceptions that tournaments are more risky and less fair than fixed performance standard contracts.  Surprisingly, measures of the relative profitability of the contracts did not correlate with willingness to pay.  Our results can shed light on why agricultural producers express frustration over tournaments and can provide insights on contract and policy design.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20154

Modelling Agricultural Diffuse Pollution: CAP – WFD Interactions and Cost Effectiveness of Measures
Provedor de dados: 31
Autores: Mouratiadou,   Ioanna; Topp,   Cairistiona; Moran,   Dominic.
Within the context of the Water Framework Directive (WFD) and the Common Agricultural Policy (CAP), the design of effective and sustainable agricultural and water resources management policies presents multiple challenges. This paper presents a methodological framework that will be used to identify synergies and trade-offs between the CAP and the WFD in relation to their economic and water resources environmental effects, and to assess the cost-effectiveness of measures to control water pollution, in a representative case study catchment in Scotland. The approach is based on the combination of a biophysical simulation model (CropSyst) with a mathematical programming model (FSSIM-MP), so as to provide a better understanding and representation of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Bio-economic Modelling; Water Framework Directive; Common Agricultural Policy; Agricultural and Food Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6461

Stata tip 33: Sweet sixteen: Hexadecimal formats and precision problems
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117581

Stata tip 61: Decimal commas in results output and data input
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122593

Using Nielsen Homescan Data and Complex Design Techniques to Analyze Convenience Food Expenditures
Provedor de dados: 31
Autores: Harris,   James Michael.
This paper looks at the A.C. Nielsen Homescan panel data, the sampling procedure, some of the issues associated with its use, and presents an expenditure analysis of ready foods based on the panel data.  Complex survey design techniques are used to produce population estimates and statistics since complex designs can create potential problems for ordinary estimation techniques.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19344

Estimating Willingness to Pay for E10 fuel: a contingent valuation study
Provedor de dados: 31
Autores: Bhattacharjee,   Sanjoy; Petrolia,   Daniel R.; Herndon,   Cary W., Jr.
In this study, we measure willingness to pay for E10 fuel by US consumers employing a contingent valuation technique in a simultaneous latent variable equation framework. The simultaneous equation framework helps us to understand the way consumers' perceptions about ethanol are developed and influence their respective buying behavior.
Tipo: Conference Paper or Presentation
Palavras-chave: E10 ethanol; Perceptions and economic choice; Latent variable; Random utility models; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; C12; C35; D12.
Ano: 2008
URL: http://purl.umn.edu/6730

Optimal Sustainable Agricultural Decisions: A Mixed Integer Approach
Provedor de dados: 31
Autores: Wicks,   Santhi; Howitt,   Richard E.
Soil is a capital asset and a renewable resource that requires continued maintenance to ensure the sustainability of agricultural output in the long-run. Growers are continually adjusting the soil's productivity by adding and extracting soil nutrients, and modifying the soil structure through cultivation.  Accordingly, we approach sustainable agriculture in terms of capital assets and switching conditions.  A theoretical model focusing on cover cropping and soil nitrates shows that profit maximizing farmers' cover cropping decision depend on the price of nitrogen, cost of chemical nitrogen, cost of cover crops and the farmer decision making horizon.  In addition, we show that restriction on application of chemical nitrogen for environmental reasons will...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19230

Repeated Games Played in a Network
Provedor de dados: 31
Autores: Kinateder,   Markus.
Delayed perfect monitoring in an infinitely repeated discounted game is modelled by allocating the players to a connected and undirected network. Players observe their immediate neighbors’ behavior only, but communicate over time the repeated game’s history truthfully throughout the network. The Folk Theorem extends to this setup, although for a range of discount factors strictly below 1, the set of sequential equilibria and the corresponding payoff set may be reduced. A general class of games is analyzed without imposing restrictions on the dimensionality of the payoff space. Due to this and the bilateral communication structure, truthful communication arises endogenously only under additional conditions. The model also produces a network result; namely,...
Tipo: Conference Paper or Presentation
Palavras-chave: Repeated Game; Delayed Perfect Monitoring; Network; Communication; Research Methods/ Statistical Methods; C72; C73; D85.
Ano: 2008
URL: http://purl.umn.edu/6377

Tests and confidence sets with correct size when instruments are potentially weak
Provedor de dados: 31
Autores: Mikusheva,   Anna; Poi,   Brian P.
We consider inference in the linear regression model with one endogenous variable and potentially weak instruments. We construct confidence sets for the coefficient on the endogenous variable by inverting the Anderson–Rubin, Lagrange multiplier, and conditional likelihood-ratio tests. Our confidence sets have correct coverage probabilities even when the instruments are weak. We propose a numerically simple algorithm for finding these confidence sets, and we present a Stata command that supersedes the one presented in Moreira and Poi (Stata Journal 3: 57–70).
Tipo: Journal Article
Palavras-chave: Condivreg; Instrumental variables; Weak instruments; Confidence set; Similar test; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117584

Potential for Tradable Water Allocation and Rights in Jordan
Provedor de dados: 31
Autores: Carpio,   Carlos E.; Ramirez,   Octavio A.; Boonsaeng,   Tullaya.
This paper estimates the costs of buying water use rights from farmers located in the Mafraq-Azraq basin in Jordan. Farmers’ water supply curve is estimated using data gathered from a contingent valuation survey. Estimation results indicate that a total supply of 29 million m3 could be periodically purchased from farmers at an annual price of approximately JD 0.23/m3 (1 JD ≈ 0.70 U.S. dollars), or a total cost of about JD 6.8 million per year.
Tipo: Conference Paper or Presentation
Palavras-chave: Contingent valuation; Non-parametric estimation; Water supply curve; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/56452

SHOULD AGRICULTURAL AND RESOURCE ECONOMISTS CARE THAT THE SUBJECTIVE EXPECTED UTILITY HYPOTHESIS IS FALSE?
Provedor de dados: 31
Autores: Woodward,   Richard T.
This paper argues that the subjective expected utility (SEU) hypothesis has serious limitations in both positive and normative analysis.  In addition to experimental evidence, we discuss examples where alternatives to the SEU model provide a richer framework for the study problems of choice under uncertainty.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20941

RELIABILITY OF PROGRAMMING SOFTWARE: COMPARISON OF SHAZAM AND SAS
Provedor de dados: 31
Autores: Odeh,   Oluwarotimi O.; Featherstone,   Allen M.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/36211

General Equilibrium Modelling Applied to Romania (GEMAR): Focusing on the Agricultural and Food Sectors
Provedor de dados: 31
Autores: Scrieciu,   Silviu Serban; Blake,   Adam.
Applied general equilibrium modelling represents a powerful tool for assessing future likely economic changes due to upcoming or hypothesised policy shocks such as those brought about by EU enlargement. It entails the main advantage of considering the complex simultaneous linkages, interactions and feedback effects between various sectors, institutions and factor resources within an economy, as well as the inter- and intra-industry trade links with other economies across the globe. This technical paper develops a general equilibrium model applied to Romania (GEMAR) with an emphasis on the agricultural and food processing activities. A simple simulation example is then given for illustrative purposes. More extensive use of GEMAR will be made in other...
Tipo: Working or Discussion Paper
Palavras-chave: Applied General Equilibrium Modelling; Romania; Agriculture; D58; O520; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/30585

SIMULTANEOUS EQUATIONS BAYESIAN BOOTSTRAP
Provedor de dados: 31
Autores: Heckelei,   Thomas; Mittelhammer,   Ronald C.
This paper introduces a semi-parametric bootstrapping approach to Bayesian analysis of structural parameters in simultaneous equation systems that extends the single and multivariate regression approaches of Heckelei and Mittelhammer (1996, 2002) to models with endogenous regressors. Monte Carlo evidence demonstrated the considerable accuracy of the procedure in approximating posterior distributions, even for small sample sizes.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19873

SPATIOTEMPORAL MODELING OF AGRICULTURAL YIELD MONITOR DATA
Provedor de dados: 31
Autores: Nistor,   Adela P.; Florax,   Raymond J.G.M.; Lowenberg-DeBoer,   James; Brown,   Jason P.
Replaced with revised version of paper 03/06/08.
Tipo: Working or Discussion Paper
Palavras-chave: Corn; Drainage; Precision agriculture; Spatial panel model; Crop Production/Industries; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; O18; Q18; R15; R38; R58.
Ano: 2008
URL: http://purl.umn.edu/6717

MULTIPERIOD OPTIMIZATION:  DYNAMIC PROGRAMMING VS. OPTIMAL CONTROL:  DISCUSSION
Provedor de dados: 31
Autores: Talpaz,   Hovav.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32262

Review of Stata par la pratique : statistiques, graphiques et éléments de programmation, by Éric Cahuzac and Christophe Bontemps
Provedor de dados: 31
Autores: Terracol,   Antoine.
This article reviews Stata par la pratique, by Éric Cahuzac and Christophe Bontemps.
Tipo: Article
Palavras-chave: French; Learning Stata; Cahuzac; Bontemps; Splp; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122623

Dynamic Relationship between Agricultural Trade and FDI in China
Provedor de dados: 31
Autores: Fei,   Ping; Xu,   Liqing.
On the basis of time series data from 1984 to 2006, co-integration analysis and VAR model are used to carry out empirical analysis on the dynamic relationship between the foreign direct investment in agriculture and the variable volume of international trade of agricultural products. Result shows that there is long-term co-integration relationship between the two. But it is probable that foreign direct investment (FDI) has substituted for improving in the short term and shows deviation from the long-run equilibrium relationship. Therefore, we put forward two policy proposals which are improving market system and strengthening the import management of foreign-funded enterprises.
Tipo: Thesis or Dissertation
Palavras-chave: Foreign direct investment; Agricultural products; International trade; China; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53528

RESPONDENTS TO CONTINGENT VALUATION SURVEYS: CONSUMERS OR CITIZENS (BLAMEY, COMMON AND QUIGGIN, AJAE 39:3) - A COMMENT
Provedor de dados: 31
Autores: Rolfe,   John; Bennett,   Jeffrey W.
Blarney, Common and Quiggin (1995) (BCQ) suggest that responses to contingent valuation (CV) questionnaires may be framed either according to the extent of individual benefits received, or according to wider views about ethical frameworks, impacts on other people, or desired societal levels. They characterise the individual benefit approach as a consumer model, and responses indicating wider concerns as citizen preferences. Citizen value responses are held to invalidate the economic assumptions underlying the use of CV. Hence, they hypothesize that the incorporation of CV results into benefit-cost analysis is problematic.  In this comment we suggest that there are several flaws with the citizen value hypothesis. These can be grouped into arguments about...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/22393

VALIDATION OF LINEAR PROGRAMMING MODELS
Provedor de dados: 31
Autores: McCarl,   Bruce A.; Apland,   Jeffrey.
Systematic approaches to validation of linear programming models are discussed for prescriptive and predictive applications to economic problems. Specific references are made to a general linear programming formulation, however, the approaches are applicable to mathematical programming applications in general. Detailed procedures are outlined for validating various aspects of model performance given complete or partial sets of observed, real world values of variables. Alternative evaluation criteria are presented along with procedures for correcting validation problems.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/29773

PORTFOLIO ANALYSIS CONSIDERING ESTIMATION RISK AND IMPERFECT MARKETS
Provedor de dados: 31
Autores: Dixon,   Bruce L.; Barry,   Peter J.
Mean-variance efficient portfolio analysis is applied to situations where not all assets are perfectly price elastic in demand nor are asset moments known with certainty.  Estimation and solution of such a model are based on an agricultural banking example.  The distinction and advantages of a Bayesian formulation over a classical statistical approach are considered.  For maximizing expected utility subject to a linear demand curve, a negative exponential utility function gives a mathematical programming problem with a quartic term.  Thus, standard quadratic programming solutions are not optimal.  Empirical results show important differences between classical and Bayesian approaches for portfolio composition, expected return and measures of risk.
Tipo: Journal Article
Palavras-chave: Agricultural Finance; Research Methods/ Statistical Methods.
Ano: 1983
URL: http://purl.umn.edu/32102

Can Calibration Reconcile Stated and Observed Preferences?
Provedor de dados: 31
Autores: Norwood,   F. Bailey.
Hypothetical bias is a pervasive problem in stated-preference experiments.  Recent research has developed two empirically successful calibrations to remove hypothetical bias, though the calibrations have not been tested using the same data or in a conjoint analysis.  This study compares the two calibrations in a conjoint analysis involving donations to a public good.  Results find the calibrations are biased predictors of true donations but that calibrated and uncalibrated models together provide upper and lower bounds to true donations.
Tipo: Journal Article
Palavras-chave: Calibration; Experimental economics; Forecasting; Hypothetical bias; Public goods; Stated preference; Voluntary contributions; Research Methods/ Statistical Methods; Q51; H41.
Ano: 2005
URL: http://purl.umn.edu/43735

Le marché de bestiaux du gouvernorat de Sidi Bouzid: un levier de développement rural du Centre tunisien
Provedor de dados: 31
Autores: Selmi,   Salah; Elloumi,   Mohamed; Allagui,   Leila; Chouaibi,   Walid.
L’élevage ovin est une activité traditionnelle dans toutes les régions de la Tunisie et surtout le Centre et le Sud. Sur le plan national et jusqu'à une date récente seule la viande bovine retenait l'attention des pouvoirs publics et les opérateurs privés. Face aux enjeux actuels de satisfaction des besoins du pays en viandes rouges et la mise à niveau de la filière des ovins, on assiste à un processus de développement du secteur qui connaît une restructuration du cheptel et une intensification de la production en intégrant les cultures fourragères ainsi qu’une mise à niveau des marchés de bestiaux. Dans le gouvernorat de Sidi Bouzid où l’élevage ovin occupe une place de choix dans l’économie régionale, les systèmes de production agricole connaîssent une...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Production Economics; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/52000

CONTROLLING WILDLIFE AND LIVESTOCK DISEASE WITH ENDOGENOUS ON-FARM BIOSECURITY
Provedor de dados: 31
Autores: Horan,   Richard D.; Wolf,   Christopher A.; Fenichel,   Eli P.; Mathews,   Kenneth H., Jr.
The spread of infectious disease among and between wild and domesticated animals has become a major problem worldwide.  We analyze the socially optimal management of wildlife and livestock, including choices involving environmental habitat variables and on-farm biosecurity controls, when wildlife and livestock can spread an infectious disease to each other.  The model is applied to the problem of bovine tuberculosis among Michigan white-tailed deer.  The optimum is a cycle in which the disease remains endemic in the wildlife, but in which the cattle herd is depleted when the prevalence rate in deer grows too large.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20349

AN EXPERIMENTAL INVESTIGATION OF ALTERNATIVE INCENTIVE SCHEMES WITH HETEROGENEOUS AGENTS
Provedor de dados: 31
Autores: Wu,   Steven Y.; Roe,   Brian E.; Sporleder,   Thomas L.; Nazaryan,   Natalie.
Experimental economics is used to compare tournaments (T) and fixed performance contracts (F) when agents have heterogeneous costs. Results suggest that: (1) There is no difference in average pooled effort across contracts, (2) high ability agents exert higher effort than low ability agents under both types of contracts, (3) average pooled earnings are affected by contract type, (4) high ability agents benefit from T whereas low ability agents are harmed by T, and (5) the difference in average pay between high and low ability agents is larger under T.  Thus, T implement greater inequality.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/28318

The Overall Significance of Attributes and Attributes’ Levels on Fresh Fruit Choice
Provedor de dados: 31
Autores: Groot,   Etienne; Albisu,   Luis Miguel.
Fresh fruits are always recommended as ingredients in healthiest diets. However, there is a tendency for consumers to move their consumption towards transformed fruits, which are integrated in many food products. Quite commonly fresh fruits are difficult to handle and store but they also do not have regular quality when they reach consumers. There are many other elements besides the physical characteristics, which are very important for consumers, and they can be promoted through marketing actions. It is very important to understand why consumers make elections of fresh fruits in order to increase their consumption. The aim of this study is to understand how consumers make their purchasing choices based on the most important peaches’ attributes and levels....
Tipo: Conference Paper or Presentation
Palavras-chave: Peaches; Protected Designation of Origin (PDO); Consumer behaviour; Market segments; Attribute levels best‐worst experiment; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100469

Open-loop and feedback models of dynamic oligopoly
Provedor de dados: 31
Autores: Karp,   Larry S.; Perloff,   Jeffrey M.
Tipo: Working or Discussion Paper
Palavras-chave: Industrial Organization; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/6089

AN ECONOMIC EVALUATION OF ADDITIONAL MEASUREMENT IN WOOL PROCESSING
Provedor de dados: 31
Autores: Spinks,   Murray; Lehmer,   Carola.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/22900

MODELING IMPACTS OF SOIL CONSERVATION ON PRODUCTIVITY AND YIELD VARIABILITY: EVIDENCE FROM A HETEROSKEDASTIC SWITCHING REGRESSION
Provedor de dados: 31
Autores: Shively,   Gerald E.
The impact of soil conservation adoption on yield and yield risk is investigated using a conditionally heteroskedastic production function with endogenous switching.  Analysis shows that controlling for plot-specific factors, adopters exhibit lower yields and higher yield variance than non-adopters.  Regression results indicate soil conservation increases yields and reduces yield variance.
Tipo: Conference Paper or Presentation
Palavras-chave: Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20930

Price volatility in ethanol markets
Provedor de dados: 31
Autores: Serra,   Teresa; Zilberman,   David.
Our paper looks at how price volatility in the Brazilian ethanol industry changes over time and across markets. Demand and supply forces in the energy and food markets are likely to ensure that crude oil, ethanol and feedstock prices co-move in the long-run. Hence, when assessing price volatility changes and spillovers in the ethanol industry, one should also pay attention to the notion of cointegration. Until recently, the methods proposed to estimate cointegration relationships, have not explicitly considered time varying volatility in the data. Seo (2007) suggests an estimator of the cointegration vector that explicitly models conditional heteroskedasticity. More specifically, he proposes a maximum likelihood estimator that estimates the error...
Tipo: Conference Paper or Presentation
Palavras-chave: Volatility; Ethanol; Cointegration; Demand and Price Analysis; Research Methods/ Statistical Methods; Q11; C32.
Ano: 2009
URL: http://purl.umn.edu/49940

ASSET FIXITY IN U.S. AGRICULTURE: ROBUSTNESS TO FUNCTIONAL FORM
Provedor de dados: 31
Autores: Lin,   Ni; Shumway,   C. Richard.
The sensitivity of asset fixity conclusions, input adjustment rates, and elasticities to choice of functional form is examined using a dynamic dual model of U.S. agriculture. A very general initial specification allows tests of instantaneous adjustment to be performed for every input.  Test results are mixed across functional forms for all inputs except real estate, which is consistently found to be quasi-fixed. Important differences in estimated adjustment rates and elasticities are also found among the functional forms. The translog has higher likelihood support than either the generalized Leontief or normalized quadratic functional forms for this dynamic model specification and data set.
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural Finance; Research Methods/ Statistical Methods; Q11; C51.
Ano: 2000
URL: http://purl.umn.edu/12967

The Relative Performance of In-Sample and Out-of-Sample Hedging Effectiveness Indicators
Provedor de dados: 31
Autores: Dahlgran,   Roger A.
Hedging effectiveness is the proportion of price risk removed through hedging. Empirical hedging studies typically estimate a set of risk minimizing hedge ratios, estimate the hedging effectiveness statistic, apply the estimated hedge ratios to a second group of data, and examine the robustness of the hedging strategy by comparing the hedging effectiveness for this "out-of-sample" period to the "in-sample" period. This study focuses on the statistical properties of the in-sample and out-of-sample hedging effectiveness estimators. Through mathematical and simulation analysis we determine the following: (a) the R2 for the hedge ratio regression will generally overstate the amount of price risk reduction that can be achieved by hedging, (b) the properly...
Tipo: Conference Paper or Presentation
Palavras-chave: Out-of-sample; Post sample; Hedging; Effectiveness; Forecasts; Simulation; Agribusiness; Agricultural Finance; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53042

Confidence intervals for the variance component of random-effects linear models
Provedor de dados: 31
Autores: Bottai,   Matteo; Orsini,   Nicola.
We present the postestimation command xtvc to provide confidence intervals for the variance components of random-effects linear regression models. This command must be used after xtreg with option mle. Confidence intervals are based on the inversion of a score-based test (Bottai 2003).
Tipo: Journal Article
Palavras-chave: Xtvc; Variance components; Confidence intervals; Score test; Random-effects linear models; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116270

Horizontal and Vertical Networks for Innovation in the Traditional Food Sector
Provedor de dados: 31
Autores: Gellynck,   Xavier; Kuhne,   Bianka.
The locus of innovation is not the individual firm anymore but increasingly the network in which the firm is embedded. Hence, in this paper innovation is investigated in the broader context of networks and applied to the traditional food sector. Networking refers to a process of identifying and acting on complementary interests with or without formal means of cooperation and plays an important role for the diffusion and adoption of innovations, because they increase the flow of information. Two main types of networks exist. Vertical networks relate to cooperation of partners belonging to the same chain. Meanwhile, horizontal networks refer to cooperation among firms which are primarily competitors. Data were collected during focus groups and in‐depth...
Tipo: Journal Article
Palavras-chave: Horizontal and vertical networks; Traditional food products; Innovation; Focus groups; In‐depth interviews; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/97229

NONPARAMETRIC REGRESSION UNDER ALTERNATIVE DATA ENVIRONMENTS
Provedor de dados: 31
Autores: Sam,   Abdoul G.; Ker,   Alan P.
This paper proposes a nonparametric bias-reduction regression estimator which can accommodate two empirically relevant data environments. The first data environment assumes that at least one of the predictor variables is discrete. In such an empirical framework, a "cell" approach, which consists of estimating a separate regression for each discrete cell has generally been employed. However, the "cell" estimator may be inefficient in that it does not include data from the other cells when estimating the regression function for a given cell. The second data environment assumes that the researcher is faced with a system of regression functions that belong to different experimental units. In each case, the new estimator attempts to reduce estimation error by...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20417

How to deal with the challenges of linking a large number of individual national models: the case of the AGMEMOD Partnership
Provedor de dados: 31
Autores: Salamon,   Petra; Chantreuil,   Frederic; Donnellan,   Trevor; Erjavec,   Emil; Esposti,   Roberto; Hanrahan,   Kevin F.; van Leeuwen,   Myrna; Bouma,   Foppe; Dol,   Wietse; Salputra,   Guna.
The AGMEMOD Partnership seeks to capture the inherent existing heterogeneity of agricultural systems by linking together individual EU Member State models, an aggregated EU model and several accession countries into one single model, while still maintaining analytical consistency. Although this approach facilitates the comparison of the impact of a policy change across different Member States, it generates challenges in practical implementation, ranging from significant communication and administration requirements, to aggregation and consistency issues. This contribution provides insights into the different challenges posed to the scientists and discusses the key issues for maintenance and further development of such a complex system. Specific attention...
Tipo: Journal Article
Palavras-chave: Linking models; Policy analysis; Partial equilibrium modelling; Common Agricultural Policy (CAP); Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97709

Customer Communication of Regional Quality Efforts: A Case From the Grain Sector
Provedor de dados: 31
Autores: Meyer,   Christian H.; Fritz,   Melanie; Schiefer,   Gerhard.
Usually, marketing communication efforts in the agrifood sector address the end consumers and concentrate on products that are processed and ready for consumption, thus quality efforts often concentrate on the final product. Moreover, there’s a widespread view that agricultural commodities like wheat aren’t suitable neither for product focused marketing nor branding. However, recent developments in the in agrifood sector challenge this view. The increasing use of biotechnology, the globalisation of markets and changing consumer demands for quality, food safety and process attributes require improved communication concepts and information sharing along whole production chains. This paper considers the development of a quality communication system to support...
Tipo: Conference Paper or Presentation
Palavras-chave: Prototyping; Quality communication system; Region of origin; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100595

Review of A Handbook of Statistical Analyses Using Stata, Fourth Edition, by Rabe-Hesketh and Everitt
Provedor de dados: 31
Autores: Dupont,   William D.
This article reviews A Handbook of Statistical Analyses Using Stata, Fourth Edition, by Sophia Rabe-Hesketh and Brian S. Everitt.
Tipo: Article
Palavras-chave: Applied statistics; Stata texts; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119272

Technical Developments in Agricultural Estimates Methodology
Provedor de dados: 31
Autores: Trelogan,   Harry C.; Caudill,   C.E.; Huddleston,   Harold F.; Kibler,   William E.; Brooks,   Emerson M.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/97459

An integrated model platform for the economic assessment of agricultural policies in the European Union
Provedor de dados: 31
Autores: Perez Dominguez,   Ignacio; Gay,   Stephan Hubertus; M'Barek,   Robert.
A number of economic models have been applied to analyse the Common Agricultural Policy. The partial equilibrium models CAPRI, ESIM, AGLINK, AGMEMOD and CAPSIM and the general equilibrium models GLOBE and GTAP are currently integrated in a modelling platform for Agro-Economic Policy Analysis in the premises of the Joint Research Centre in Seville in close collaboration with Directorate- General for Agriculture and Rural Development. Each of the models included has a specific focus, enlarging the capacity for complex policy analysis within this platform. This can be done by comparing the results of different models or by linking them, where several methodological options are available. This paper gives some insights on current applications in the field of...
Tipo: Journal Article
Palavras-chave: European Commission; Common Agricultural Policy; Economic models; Quantitative analysis; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97710

An Evaluation of Tennessee Soybean Growers’ Views on a New Generation Cooperative to Produce Biodiesel
Provedor de dados: 31
Autores: Jensen,   Kimberly L.; English,   Burton C.; Menard,   R. Jamey; Zhang,   Yu.
Substituting petroleum diesel with biodiesel could decrease air emissions, reduce reliance on foreign oil, and help expand markets for U.S. farmers. Soybean producers can potentially capture this value-added by forward integrating the processing of soybeans into biodiesel via a New Generation Cooperative (NGC). Using probit analysis, this study examines factors influencing soybean producers’ willingness to participate in an NGC to produce biodiesel. Tobit analysis is used to examine the factors influencing the number of shares the soybean producer would be willing to purchase. Survey results indicate that over 70% of the soybean producers in the study group are interested in investing in an NGC to produce biodiesel. Among those producers willing to...
Tipo: Journal Article
Palavras-chave: Biodiesel; New Generation Cooperative; Probit analysis; Soybean producers; Tobit analysis; Marketing; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/59400

Optimization Models in Agricultural and Resource Economics
Provedor de dados: 31
Autores: Day,   Richard H.; Sparling,   Edward.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/96817

ON THE ESTIMATION OF DEMAND SYSTEMS WITH LARGE NUMBER OF GOODS: AN APPLICATION TO SOUTH AFRICA HOUSEHOLD FOOD DEMAND
Provedor de dados: 31
Autores: Agbola,   Frank W.; Maitra,   Pushkar; McLaren,   Keith Robert.
The estimation of large demand systems to investigate the patterns of consumption of households is notoriously difficult. This study develops a modified Almost Ideal Demand System model based on a flexible two-stage budgeting demand modelling framework to examine the effect of estimation procedures (Bottom-up and Top-down) on South African household food consumption parameters. Household food consumption was divided into seven broad food groups: meat and fish; grains; dairy products; fruits; vegetables; other foods. The demand systems were estimated using data from the 1993 South Africa Integrated Household Survey (SIHS) conducted by the South African Labour and Development Research Unit (SALDRU). Empirical results indicate that the Top-down approach is...
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/19097

ESTIMATING THE COST OF LEISURE TIME FOR RECREATION DEMAND MODELS
Provedor de dados: 31
Autores: Feather,   Peter; Shaw,   W. Douglass.
The cost of travel time has commonly been incorporated in recreation demand models as some fucntion of the wage rate.  This paper proposes a new methodology of determining the value of leisure time.  The proposed method is compared to other alternatives and shown to yield more appropriate welfare measures.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1998
URL: http://purl.umn.edu/20855

Estimation of a Binary Choice Model with Grouped Choice Data
Provedor de dados: 31
Autores: Kurkalova,   Lyubov A.; Rabotyagov,   Sergey S.
We propose an econometric technique for estimating the parameters of a binary choice model when only aggregated data are available on the choices made. The method performs favorably in applications to both simulated and real world choice data.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/18495

Speaking Stata: Distinct observations
Provedor de dados: 31
Autores: Cox,   Nicholas J.; Longton,   Gary M.
Distinct observations are those different with respect to one or more variables, considered either individually or jointly. Distinctness is thus a key aspect of the similarity or difference of observations. It is sometimes confounded with uniqueness. Counting the number of distinct observations may be required at any point from initial data cleaning or checking to subsequent statistical analysis. We review how far existing commands in official Stata offer solutions to this issue, and we show how to answer questions about distinct observations from first principles by using the by prefix and the egen command. The new distinct command is offered as a convenience tool.
Tipo: Article
Palavras-chave: Distinct; By; Egen; Distinctness; Uniqueness; Data management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122622

Meat Standards Australia as an Innovation in the Australian Beef Production and Marketing System
Provedor de dados: 31
Autores: Griffith,   Garry R.; Thompson,   John M.; Polkinghorne,   Rod; Gunner,   Richard.
Variable eating quality was identified as a major contributor to declining Australian beef consumption in the early 1990s. The primary issue was the inability to predict the eating quality of cooked beef before consumption. A R&amp;D program funded by industry and Meat and Livestock Australia investigated the relationships between critical control points along the supply chain, cooking methods and beef palatability. These relationships were underpinned by extensive consumer taste panels. Out of this R&amp;D grew the Meat Standards Australia (MSA) voluntary meat grading system which aimed at predicting consumer palatability scores of cooked beef. Quality was defined on the basis of one of four grades. The grading model predicts consumer scores for 135 ‘cut...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100471

DISCRETE STOCHASTIC PROGRAMMING: CONCEPTS, EXAMPLES AND A REVIEW OF EMPIRICAL APPLICATIONS
Provedor de dados: 31
Autores: Apland,   Jeffrey; Hauer,   Grant.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/13793

Speaking Stata: Between tables and graphs
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Table-like graphs can be interesting, useful, and even mildly innovative. This column outlines some Stata techniques for producing such graphs. graph dot is likely to be the most under-appreciated command among all existing commands. Using by() with various choices is a good way to mimic a categorical axis in many graph commands. When graph bar or graph dot is not flexible enough to do what you want, moving to the more flexible twoway is usually advisable. labmask and seqvar are introduced as new commands useful for preparing axis labels and axis positions for categorical variables. Applications of these ideas to, e.g., confidence interval plots lies ahead.
Tipo: Article
Palavras-chave: Labmask; Seqvar; Tables; Graphs; Dot charts; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122591

Effects of Family, Friends, and Relative Prices on Fruit and Vegetable Consumption by African American Youths
Provedor de dados: 31
Autores: Zhylyevskyy,   Oleksandr; Jensen,   Helen H.; Garasky,   Steven B.; Cutrona,   Carolyn E.; Gibbons,   Frederick X.
Paper for presentation at the Northeastern Agricultural &amp; Resource Economics Association’s Workshop on Economics and Child Nutrition Programs, AAEA &amp; NAREA Joint Annual Meeting, Pittsburgh, Pennsylvania, July 23, 2011.
Tipo: Conference Paper or Presentation
Palavras-chave: Fruit and vegetable consumption; Healthy food choices; Social interactions; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; I12; J15; C35; Q18.
Ano: 2011
URL: http://purl.umn.edu/107086

Crop Insurance, Disaster Payments, and Incentives for Land Use Change in Agriculture:  A Preliminary Assessment
Provedor de dados: 31
Autores: Carriazo,   Fernando; Claassen,   Roger; Cooper,   Joseph C.
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Insurance; Disaster Payments; Supplemental Revenue Assistance; Corn; Wheat; Agricultural and Food Policy; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/49218

Adapting Johansen’s Estimation Method for Flexible Regime-dependent Cointegration Modelling
Provedor de dados: 31
Autores: Ihle,   Rico; Amikuzuno,   Joseph; von Cramon-Taubadel,   Stephan.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/114461

Accommodating covariates in receiver operating characteristic analysis
Provedor de dados: 31
Autores: Janes,   Holly; Longton,   Gary M.; Pepe,   Margaret S.
Classification accuracy is the ability of a marker or diagnostic test to discriminate between two groups of individuals, cases and controls, and is commonly summarized by using the receiver operating characteristic (ROC) curve. In studies of classification accuracy, there are often covariates that should be incorporated into the ROC analysis. We describe three ways of using covariate information. For factors that affect marker observations among controls, we present a method for covariate adjustment. For factors that affect discrimination (i.e., the ROC curve), we describe methods for modeling the ROC curve as a function of covariates. Finally, for factors that contribute to discrimination, we propose combining the marker and covariate information, and we...
Tipo: Article
Palavras-chave: Roccurve; Comproc; Rocreg; Receiver operating characteristic analysis; ROC; Covariates; Sensitivity; Specificity; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122695

Front Materials
Provedor de dados: 31
Includes: Front Cover, Table of Contents, Editorial Information
Tipo: Journal Article
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Food Security and Poverty; Health Economics and Policy; Industrial Organization; International Development; Labor and Human Capital; Land Economics/Use; Livestock Production/Industries; Marketing; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2011
URL: http://purl.umn.edu/104625

IMPOSING CURVATURE RESTRICTIONS ON A TRANSLOG COST FUNCTION USING A MARKOV CHAIN MONTE CARLO SIMULATION APPROACH
Provedor de dados: 31
Autores: Mulik,   Kranti; Featherstone,   Allen M.; Marsh,   Thomas L.
Using Kansas Farm data from 1973 to 1998, curvature restrictions are imposed on a translog cost function. Using uninformative priors with indicator functions representing distribution and inequality constraints, a Markov Chain Monte Carlo Simulation method is used to estimate parameters and check curvature at each point. Comparison is made to the Cholesky factorization method commonly used with the normalized quadratic functional form.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22038

DISCUSSION OF OUTLOOK AND PROJECTIONS
Provedor de dados: 31
Autores: Youde,   James G.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/32172

Sampling Theory of Food Safety System
Provedor de dados: 31
Autores: Li,   Bing; Chen,   Guohua; Zhu,   Ning.
We introduce the stratified sampling method, and put forward theoretical unbiased estimation of stratified sampling program, as well as the model and statistics of experimental design test. We also discuss the establishment of dietary exposure model, pollutant distribution model, and risk evaluation model. Finally, we present some methods for sampling design in China.
Tipo: Thesis or Dissertation
Palavras-chave: Exposure model; Pollutant model; Stratified sampling; Experimental design; Risk evaluation model; China; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53588

LEAST SQUARES ESTIMATION OF DISTRIBUTED LAG MODELS: RELATIONSHIPS BETWEEN ACTUAL AND FIRST DIFFERENCE EQUATIONS
Provedor de dados: 31
Autores: Subotnik,   Abraham; Houck,   James P.
The purpose of this paper is to focus on the rigidity model and illustrate some relationships between the typical use of the model and a version of it involving first differences in the dependent variable. These relationships will be extended to least squares estimation of rigidity models. A useful correspondence between least squares estimates of the typical model and the first difference model will be demonstrated.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1970
URL: http://purl.umn.edu/13710

Review of An Introduction to Survival Analysis Using Stata
Provedor de dados: 31
Autores: Hosmer,   David W.
This article reviews An Introduction to Survival Analysis Using Stata by Cleves et al.
Tipo: Journal Article
Palavras-chave: Survival time regression models; Time to event analysis; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116027

SPATIO-TEMPORAL MODELING OF AGRICULTURAL YIELD DATA WITH AN APPLICATION TO PRICING CROP INSURANCE CONTRACTS
Provedor de dados: 31
Autores: Ozaki,   Vitor Augusto; Ghosh,   Sujit K.; Goodwin,   Barry K.; Shirota,   Ricardo.
This article focuses on the modeling of agricultural yield data using hierarchical Bayesian models. In recovering the generating process of these data, we consider the temporal, spatial and spatio-temporal relationships pertinent to the prediction and pricing of insurance contracts based on regional crop yields. A county-average yield data set was analyzed for the State of Paraná, Brazil for the period of 1990 through 2002. The choice of the best model from among the several non-nested models considered was based on the posterior predictive criterion. The methodology used in this article proposes improvements in the statistical and actuarial methods often applied to the calculation of insurance premium rates.  These improvements are especially relevant to...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19142

FORWARD CONTRACTING SPECIFICATION THROUGH COLLECTIVE BARGAINING
Provedor de dados: 31
Autores: Chin,   Ming-Chin; Weaver,   Robert D.
Game-based bargaining theory is presented to evaluate the potential of and stability of cooperative coalition among producers for enhancing producer returns and managing market price and income risk. Results clarify that collective bargaining can increase and stabilize producer profits when they face a single processor.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20006

Causal inference with observational data
Provedor de dados: 31
Autores: Nichols,   Austin.
Problems with inferring causal relationships from nonexperimental data are briefly reviewed, and four broad classes of methods designed to allow estimation of and inference about causal parameters are described: panel regression, matching or reweighting, instrumental variables, and regression discontinuity. Practical examples are offered, and discussion focuses on checking required assumptions to the extent possible.
Tipo: Article
Palavras-chave: Xtreg; Psmatch2; Nnmatch; Ivreg; Ivreg2; Ivregress; Rd; Lpoly; Xtoverid; Ranktest; Causal inference; Match; Matching; Reweighting; Propensity score; Panel; Instrumental variables; Excluded instrument; Weak identification; Regression; Discontinuity; Local polynomial; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119292

A Translog Cost Function Analysis of U.S. Agriculture: 1948-1999
Provedor de dados: 31
Autores: Ball,   V. Eldon; Nehring,   Richard F.; Moss,   Charles B.; Erickson,   Kenneth W.
This study examines the implications of the short-run specification of the standard, static translog cost function along with the possible implications of non-stationarity by estimating a dynamic translog cost specification complete with dynamic share equations for the U.S. using an empirical approach developed by Urga and Walters (2003). We compare the results of the static, long-run model with those of a dynamic, short-run error-correction model in terms of 1) significance of the parameter estimates, and 2) consistency with economic theory.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35968

BANDWIDTH SELECTION FOR SPATIAL HAC AND OTHER ROBUST COVARIANCE ESTIMATORS
Provedor de dados: 31
Autores: Lambert,   Dayton M.; Florax,   Raymond J.G.M.; Cho,   Seong-Hoon.
This research note documents estimation procedures and results for an empirical investigation of the performance of the recently developed spatial, heteroskedasticity and autocorrelation consistent (HAC) covariance estimator calibrated with different kernel bandwidths. The empirical example is concerned with a hedonic price model for residential property values. The first bandwidth approach varies an a priori determined plug-in bandwidth criterion. The second method is a data driven cross-validation approach to determine the optimal neighborhood. The third approach uses a robust semivariogram to determine the range over which residuals are spatially correlated. Inference becomes more conservative as the plug-in bandwidth is increased. The data-driven...
Tipo: Working or Discussion Paper
Palavras-chave: Spatial HAC; Semivariogram; Bandwidth; Hedonic model; Research Methods/ Statistical Methods; C13; C31; R21.
Ano: 2008
URL: http://purl.umn.edu/45964

RECOVERING LOCALIZED INFORMATION ON  AGRICULTURAL STRUCTURE UNDERLYING DATA  CONFIDENTIALITY REGULATIONS - POTENTIALS OF  DIFFERENT DATA AGGREGATION AND SEGREGATION  TECHNIQUES
Provedor de dados: 31
Autores: Gocht,   Alexander; Roeder,   Norbert.
The  modelling  and  information  system  RAUMIS  is  used  for  policy  impact  assessment  to  measure the impact of agriculture on the environment. The county level resolution often limits  the analysis and a further disaggregation at the municipality level would reduce aggregation  bias  and  improve  the  assessment.  Although  the  necessary  data  exists  in  Germany,  data  protection rules (DPR) prohibit their direct use. With methods such as the Locally Weighted  Averages  (LWA),  and  with  aggregation  singling  production  activities  into  larger  groups  of  activities,  the  data  at  the  municipality  level  can  be  made  publicly  available.  However,  this  reduces  the  information  content  and  introduces  an  additional  error....
Tipo: Conference Paper or Presentation
Palavras-chave: Highest Posterior Density estimator (HPD); RAUMIS; Locally weighted  average (LWA); Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93975

ECONOMIC ANALYSIS OF ENVIRONMENTAL REGULATIONS: APPLICATION OF THE RANDOM UTILITY MODEL TO RECREATIONAL BENEFIT ASSESSMENT FOR THE MP&amp;M EFFLUENT GUIDELINE
Provedor de dados: 31
Autores: Tudor,   Lynne G.; Besedin,   Elena Y.; Fisher,   Michael; Smith,   Stuart.
The present study focuses on a state-wide case study to evaluate recreational benefits from forthcoming effluent limitation guidelines for the Metal Products and Machinery Industry.  The study combines water quality modeling and a random utility model to assess how changes in water quality from the regulation will affect consumer valuation of water resources.  Based on preliminary results,  the MP&amp;M regulation has the potential to generate substantial recreational benefits in Ohio.
Tipo: Conference Paper or Presentation
Palavras-chave: Water quality; Recreational benefits; Random utility model; RUM; Recreational fishing; Boating; Swimming; Near water activities; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21630

A Comparison of Parametric Approximation Techniques to Continuous-Time Stochastic Dynamic Programming Problems
Provedor de dados: 31
Autores: Kompas,   Tom; Chu,   Long.
We compare three parametric techniques to approximate Hamilton-Jacobi-Bellman equations via unidimensional and multidimensional problems. The linear programming technique is very efficient for unidimensional problems and offers a balance of speed and accuracy for multidimensional problems. A comparable projection technique is shown to be slow, but has stable accuracy, whereas a perturbation technique has the least accuracy although its speed suffers least from the curse of dimensionality. The linear programming technique is also shown to be suitable for problems in resource management, including applications to biosecurity and marine reserve design.
Tipo: Journal Article
Palavras-chave: Stochastic dynamic programming; Parametric approximation; Perturbation; Projection; Linear programming; Optimal fishing; Marine reserves; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C61; C63; Q22.
Ano: 2010
URL: http://purl.umn.edu/95044

ENVIRONMENTALLY ADJUSTED MEASURES OF GAINS FROM TRADE LIBERALIZATION: THE CASE OF U.S. CORN PRODUCTION
Provedor de dados: 31
Autores: Intarapapong,   Walaiporn; Peterson,   E. Wesley F.
An econometric model of the U.S. corn sector is used to estimate the welfare effects of the Uruguay Round Agreement.  Trade liberalization also leads to changes in input use that can affect the environment.  The gains from trade liberalization are adjusted for the environmental effects caused by these changes.
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20914

Qualitative Research: A Grounded Theory Example and Evaluation Criteria
Provedor de dados: 31
Autores: Bitsch,   Vera.
The qualitative research paradigm, although occasionally applied, is not widely discussed in agribusiness and agricultural economics literature. The primary goals of this paper are (a) to present insights into qualitative research approaches and processes by outlining grounded theory as an example of a systematic and rigorous qualitative approach, and (b) to discuss criteria for scientific rigor applicable to qualitative research. In addition, assessing qualitative research is demonstrated by using a published example.
Tipo: Journal Article
Palavras-chave: Management research; Methodology; Qualitative research methods; Reliability; Validity; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/59612

Gross output and livestock sales modelling in Spanish extensive farms using PLSR
Provedor de dados: 31
Autores: Gaspar,   P.; Mesias,   F.J.; Escribano Sanchez,   Miguel; Pulido,   F.
The aim of this paper is to model some production variables in extensive livestock farms located in the dehesa ecosystem. We intend to use not only purely economic variables in the construction of the model, but also structural variables in order to identify the characteristics of the farms that have the higher influence. Another objective is to be able to predict these variables at the farm level, using structural variables that are easy to measure. The data used in this work were obtained from a questionnaire survey to the holders/managers of a sample of 69 dehesa farms in Extremadura (SW Spain). The statistical methodology used for the construction of the model was Partial Least Square Regression (PLSR). It can be concluded that the variables relative...
Tipo: Conference Paper or Presentation
Palavras-chave: Dehesa; Livestock farming systems; Partial least square regression; Gross output; Crop Production/Industries; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6463

Multi-time Scale Analysis on the Cultivated Land Quantity in China
Provedor de dados: 31
Autores: Liu,   Zhiling; Sun,   Yan.
This paper briefly introduces the concrete steps of EMD (Empirical Mode Decomposition) method, and applies EMD method into the multi-time scale analysis on fluctuation of cultivated land quantity and its driving force in China since 1949. We also reveal the fluctuation law in the amount of cultivated land quantity. At the same time, based on the fluctuation of different time scales, qualitative forecast on the fluctuation trend of cultivated land quantity in China in future is carried out in order to offer references for establishing prediction model of cultivated land quantity. Research result shows that downward trend of cultivated land quantity is inevitable in China in the future, showing a basic form of an exponential decline during a short period of...
Tipo: Thesis or Dissertation
Palavras-chave: Cultivated land; EMD; Multi-time scale; Driving force; China; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53809

Complex assessment of poverty using composite indicator
Provedor de dados: 31
Autores: Pacakova,   Zuzana; Hlavsa,   Tomas.
The article deals with measuring poverty whereas poverty is considered to be a multidimensional phenomenon and is represented by various dimensions. It aims to propose a methodical instrument for complex evaluation of poverty and the differences in poverty among the EU Member States. This instrument is also appropriate for regional comparison among the regions of Czech Republic. Methodical instrument on the basis of composite indicator has been suggested and it has been verified on selected poverty indicators. Using the composite indicator the development of the EU countries in the period 2004 – 2009 is described. While Denmark, Netherlands and Luxembourg made a huge improvement between the two years, the smallest progress was accomplished in Latvia,...
Tipo: Journal Article
Palavras-chave: Poverty; Material deprivation; Multivariate methods; Composite indicator; Political Economy; Production Economics; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/109741

A Note on Two-Point Risks, Certainty Equivalents and Quadratic Preference
Provedor de dados: 31
Autores: Anderson,   Jock R.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/10315

Incentive compatibility and procedural invariance testing of the one-and-one-half-bound dichotomous choice elicitation method: distinguishing strategic behaviour from the anchoring heuristic
Provedor de dados: 31
Autores: Bateman,   Ian J.; Day,   Brett H.; Dupont,   Diane P.; Georgiou,   Stavros.
The contingent valuation method for estimating willingness to pay for public goods typically adopts a single referendum question format which is statistically inefficient. As an alternative, Cooper, Hanemann and Signorello (2002) propose the ‘'one-and-one-half bound’' (OOHB) format allowing researchers to question respondents about both a lower and higher limit upon project costs, thereby securing substantial statistical efficiency gains. These bounds are presented prior to the elicitation of responses thereby avoiding the negative '‘surprise’' induced by an unanticipated second question. However, this approach conflicts with the Gibbard-Satterthwaite result that only a single referendum format question is incentive compatible. The OOHB method may...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21104

Coordination in Networks Formation: Experimental Evidence on Learning and Salience
Provedor de dados: 31
Autores: Bernasconi,   Michele; Galizzi,   Matteo M.
We present experiments on repeated non-cooperative network formation games, based on Bala and Goyal (2000). We treat the one-way and the two-ways flow models, each for high and low link costs. The models show both multiple equilibria and coordination problems. We conduct experiments under various conditions which control for salient labeling and learning dynamics. Contrary to previous experiments, we find that coordination on non-empty Strict Nash equilibria is not an easy task for subjects to achieve, even in the mono-directional model where the Strict Nash equilibria is a wheel. We find that salience significantly helps coordination, but only when subjects are pre-instructed to think of the wheel network as a reasonable way to play the networking game....
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/12159

Relationship between Economic Development Level and Environmental Quality in Qinghai Province
Provedor de dados: 31
Autores: Zhao,   Qinglin; Mao,   Wei; Peng,   Ying.
Environmental and economic data in the years 1986-2006 in Qinghai Province of China are selected. Based on Environmental Kuznets Curve (EKC) theory, models of per capita GDP and four environmental indices are established by SPSS software. Economic development level and environmental quality of Qinghai Province are simulated. Research shows that relationship between economy and environment of Qinghai Province does not completely accord with U-shaped Pattern of EKC. Fitting curve of the emission of industrial wastewater shows positive "U"-type, that of waste gas shows the right half of the U curve, and that of SO2 and solid waste shows a "U + weak inverted U"-shaped curve. Result also indicates that water environment and air pollution of Qinghai Province are...
Tipo: Thesis or Dissertation
Palavras-chave: EKC; Economic development; Environmental quality; Qinghai Province; China; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/56348

MID TERM EVALUATION OF RDPs IN ITALY: COMPARING MODELS
Provedor de dados: 31
Autores: Fucilli,   Vincenzo; De Blasi,   Giuseppe; Acciani,   Claudio.
With the reforms of Structural Funds there has been a considerable tightening of the guiding principles of Community actions. Among these, a primary role has been given to evaluation. In this context, the paper deals with what has been realized for the evaluation of rural development policy, comparing various experiences in Italy with reference to the Rural Development Plans. The aim is to verify, on the basis of (meta) criteria, the methodological contents of the mid term evaluation reports of 14 RDPs in the centre-north of Italy. Through the analyses and the comparisons of these reports, the paper is an attempt to reconstruct the “quality” of the evaluations with specific reference to the methodological aspects, the models and the procedures adopted by...
Tipo: Conference Paper or Presentation
Palavras-chave: Evaluation; Rural Development Plans; Mid Term; Metaevaluation; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6447

Modeling Heteroskedasticity of Crop Yield Distributions: Implications for Normality
Provedor de dados: 31
Autores: Kapiamba,   Luabeya F.
The paper analyzes the extent to which ignorance of heteroskedasticity or its  inadequate modeling would result in misleading statistical inferences about crop yield distribution. We follow the "detrending mean yield approach" in which we model the conditional mean yield using a panel data model. We assume alternative structures of variance-covariance matrix for the random component. Heteroskedasticity robust and non-robust estimation methods are used before performing a joint normality test on the random component of crop yield data. Our findings provide evidence against the claim that virtually all previous findings of non-normality in crop yields are infected because of the ignorance of heteroskedasticity or its inappropriate modeling. Accounting for...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19475

THE USE OF MODELS IN OPTIMIZING THE FIELD CROP PRODUCTION IN AGRICULTURAL ENTERPRISE-MBA Thesis
Provedor de dados: 31
Autores: Muncan,   Mihajlo.
The full use of resource capacities of agricultural enterprises favorably affects the general increase in economic efficiency and rational production making them more competitive in the market. This creates the need for constant improvement of business strategies that uses all available resources to create the most profitable production. The main objective of this study was to find the ideal structure of production in agricultural enterprise and to enable the realization of maximum profit using the available production resources (land, mechanization, labor forces). As the basic method of planning, this study used the simplex method of linear programming which gives the most profitable sowing structure after detailed analysis of resources and achieved...
Tipo: Thesis or Dissertation
Palavras-chave: Model; Agricultural enterprises; Resources; Profit; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/91118

A SIMPLE PROCEDURE TO EVALUATE EX-ANTE PRODUCER WELFARE UNDER PRICE UNCERTAINTY
Provedor de dados: 31
Autores: Tsur,   Yacov.
We propose a simple and tractable procedure for evaluating producer welfare under price uncertainty. These properties are achieved at the cost of assuming constant absolute risk aversion, where risk attitude depends on the stock of wealth but not on the flow of income. Numerical examples corroborate the procedure's properties; the validity of the constant absolute risk aversion case as an approximation is discussed.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/13624

PURE ALTRUISM AND THE VALUATION OF RISK: AN EXPERIMENTAL TEST OF THE JOHANNESSON ET AL. CONJECTURE
Provedor de dados: 31
Autores: Schulze,   William D.; Poe,   Gregory L.; Messer,   Kent D.
Johannesson et al.(1996) conjecture that in a coercive, uniform tax setting like dichotomous choice contingent valuation, willingness to pay for public programs would be affected by altruistic consideration of the costs imposed on others.  Using a voting-BDM elicitation mechanism, we demonstrate such valuation petterns in an experimental economics setting.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20294

EVALUATING RISK MANAGEMENT STRATEGIES USING STOCHASTIC DOMINANCE WITH A RISK FREE ASSET
Provedor de dados: 31
Autores: Gloy,   Brent A.; Baker,   Timothy G.
The stochastic dominance with a risk free asset (SDRA) criteria are evaluated. Results show that the inclusion of  the risk free asset (combined with the traditional assumptions of  stochastic dominance) produce risk efficiency criteria that are very powerful at narrowing the risk management alternatives relevant for farm manager's further consideration.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1999
URL: http://purl.umn.edu/21673

The Impact of Water Quality on Southern California Beach Recreation: A Finite Mixture Model Approach
Provedor de dados: 31
Autores: Hilger,   James; Hanemann,   W. Michael.
This paper uses a finite mixture logit (FML) model to investigate the heterogeneity of preferences of beach users for water quality at beaches in Southern California. The results are compared with conventional approaches based conditional logit (CL) and random parameters logit (RPL). The FML approach captures variation in preferences by modeling individual recreator choices using a mixture of several distinct preference groups, where group membership is a function of individual characteristic and seasonal variables. The FML parameter estimates are used to calculate welfare measures for improvements in beach quality through a reduction of water pollution. The FML segment specific welfare measures bound the traditional CL and RPL mean welfare estimates, and...
Tipo: Working or Discussion Paper
Palavras-chave: Water quality management; Water research; Recreation; Recreational use of water areas; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/47037

DYNAMIC LEARNING AND CONTEXT-DEPENDENCE IN SEQUENTIAL, ATTRIBUTE-BASED CONTINGENT VALUATION
Provedor de dados: 31
Autores: Holmes,   Thomas P.; Boyle,   Kevin J.
A hybrid stated-preference model is developed that combines the referendum contingent valuation response format with an experimentally designed set of attributes.  A sequence of valuation questions is asked to a random sample in a mail-out mail-back format.  Econometric analysis shows that willingness to pay for policy attributes is formed dynamically.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20014

Deriving CGE Baselines from Macro-economic Projections
Provedor de dados: 31
Autores: Mueller,   Marc; Ferrari,   Emanuele.
Quantitative policy analysts are usually confronted with the problem to derive a base-line scenario that reflects the most likely state of an economy in a future year. The methods used in practice to derive such a base-line scenarios are heterogeneous and range from the usage of the last observable year to complete and consistent estimation procedures. In the case of general equilibrium (CGE) analyses, the Scenar2020 project (European Commission 2006a) is one example how projections of macro-economic indicators (exogenous drivers) are used to construct the base-line as a model scenario: Starting from a calibrated version, exogenous variables are modified until macro-economic projections are met. However, numerous projections refer to economic indicators...
Tipo: Conference Paper or Presentation
Palavras-chave: General equilibrium model; Baseline construction; Parameter estimation; Macro-economic projections; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/114638

ESTIMATING FARM-LEVEL YIELD DISTRIBUTIONS FOR CORN AND SOYBEANS IN ILLINOIS
Provedor de dados: 31
Autores: Zanini,   Fabio C.; Irwin,   Scott H.; Schnitkey,   Gary D.; Sherrick,   Bruce J.
Many yield modeling approaches have been developed in attempts to provide accurate characterizations of farm-level yield distributions due to the importance of yield uncertainty in crop insurance design and rating, and for managing farm-level risk.  Competing existing models of crop yields accommodate varying skewness, kurtosis, and other departures from normality including features such as multiple modes. Recently, the received view of crop yield modeling has been challenged by Just and Weninger who indicate that there is insufficient evidence to reject normality given data limitations and potential methodological shortcomings in controlling for deterministic components (trend) in yields.  They point out that past empirical efforts to estimate and...
Tipo: Conference Paper or Presentation
Palavras-chave: Productivity Analysis; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2000
URL: http://purl.umn.edu/21720

Shadow Pricing Market Access: A Trade Benefit Function Approach
Provedor de dados: 31
Autores: Chau,   Nancy H.; Fare,   Rolf.
Appropriate assessment of the social value of market access is at the core of a broad range of inquiries in trade research. A selection include: the appraisal of industry-level production and consumption distortions due to selective trade liberalization and partial tax reform; the construction of national-level quantity indicators of market access consistent with welfare change, and the use of international trade re-balancing as sanctions to discourage trade agreement violations, or as compensation in trade dispute settlement. In order to obtain shadow prices, we propose a new approach integrating the Luenberger benefit function and the directional output distance function. This yields a trade benefit function which represents trade preferences à la Meade...
Tipo: Working or Discussion Paper
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6218

Warm glow in charitable auctions: Are the WEIRDos driving the results?
Provedor de dados: 31
Autores: Remoundou,   Kyriaki; Drichoutis,   Andreas C.; Koundouri,   Phoebe.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/114795

Examining the Functional Specification of Two-Parameter Model under Location and Scale Parameter Condition
Provedor de dados: 31
Autores: Nakashima,   Takahiro.
The functional specification of mean-standard deviation approach is examined under location and scale parameter condition.  Firstly, the full set of restrictions imposed on the mean-standard deviation function under the location and scale parameter condition are made clear.  Secondly, the examination based on the restrictions mentioned in the previous sentence derives the new properties of the mean-standard deviation function on the applicability of additive separability and the curvature of expansion path which links the points that give the same slope of indifference curve.  It reveals that attention has not been sufficiently paid to the restrictions in interpreting the linear mean-standard deviation model and the nonlinear mean-standard deviation model...
Tipo: Conference Paper or Presentation
Palavras-chave: Mean-standard deviation approach; Location and scale parameter condition; Functional specification; Risk aversion; Uncertainty; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21171

Risk, Research, and Returns: Valuation of the Potential of Improved Citrus Cultivars
Provedor de dados: 31
Autores: Brummett,   Robert G.; Richardson,   James W.
Replaced with revised version of paper 02/04/08.
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2008
URL: http://purl.umn.edu/6759

Influence of Brand Equity on Milk Choice: A Choice Experiment Survey
Provedor de dados: 31
Autores: Taglioni,   Chiara; Cavicchi,   Alessio; Torquati,   Biancamaria; Scarpa,   Riccardo.
In the context of sustainable consumption buying local produce could support environmentally friendly production from the local economy. Our study estimates the preference weights that local consumers assign to some milk attributes including local origin and the influence on choice of a local brand of milk, which is traded by a local cooperative of producers in Umbria (Italy). Several preference segments are found amongst fresh and UHT milk buyers by employing a Latent Class model to analyze stated choice data. This specification allows us to verify whether consumers who have a better attitude towards local milk also prefer this brand to others, placing different values on the regional origin of milk.
Tipo: Article
Palavras-chave: Brand equity; Milk; Latent Class Model; Origin of milk; Agribusiness; Agricultural and Food Policy; Farm Management; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121951

Heterogeneity Index of Trade and Actual Heterogeneity Index – the case of maximum residue levels (MRLs) for pesticides
Provedor de dados: 31
Autores: Burnquist,   Heloisa Lee; Shutes,   Karl; Rau,   Marie-Luise; Souza,   Mauricio Jorge Pinto de; Faria,   Rosane Nunes de.
Non-tariff measures (NTMs) beyond traditional trade policy instruments define the requirements that importing countries imposed on foreign products. Due to differences across countries, requirements for supplying foreign markets can lead to trade costs and thus hamper international trade. In this paper, we introduce two regulatory heterogeneity indexes which are subsequently applied to the case maximum residue levels (MRLs) of pesticides. The Heterogeneity Index of Trade (HIT) reflects the respective differences across countries based on the assumption that the mere fact of difference in requirements causes trade costs. Taking the HIT index as a starting point, the Actual Heterogeneity Index (AHI) specially considers the situation where the requirements...
Tipo: Conference Paper or Presentation
Palavras-chave: Non-tariff measures (NTMs); Maximum residue levels (MRLs); Regulatory heterogeneity index; Agri-food trade; Index analysis; Agricultural and Food Policy; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103742

On the use of honesty priming task to mitigate hypothetical bias in choice
Provedor de dados: 31
Autores: de Magistris,   Tiziana; Gracia,   Azucena; Nayga,   Rodolfo M., Jr.
We test whether the use of an honesty priming task from the social psychology literature can help mitigate hypothetical bias in stated preference choice experiments (CE). Using a between-sample design, we conducted experiments with five treatments: (1) hypothetical CE without cognitive task, (2) hypothetical CE with cheap talk script, (3) hypothetical CE with neutral priming task, (4) hypothetical CE with honesty priming task, and (5) non-hypothetical CE. Results generally suggest that marginal willingness to pay estimates from treatment 4 where subjects are given honesty priming task before the choice experiment are not statistically different from marginal valuations from treatment 5 where subjects are in a non-hypothetical choice experiment. Values from...
Tipo: Presentation
Palavras-chave: Hypothetical bias; Cheap talk; Priming; Willingness-to-pay; Marketing; Research Methods/ Statistical Methods; C23; D12; Q18.
Ano: 2012
URL: http://purl.umn.edu/123639

Inadequacies in the water reforms in the Kyrgyz Republic: an institutional analysis
Provedor de dados: 31
Autores: Ul Hassan,   Mehmood; Starkloff,   Ralf; Nizamedinkhodjayeva,   Nargiza.
This report analyzes the evolving water-management institutions and their performance of five core water management functions, in the context of the ongoing economic and agrarian reform in the Kyrgyz Republic. These core water-management functions are, operation of water systems, maintenance, resource mobilization, conflict resolution and organizational management. The report also identifies key issues and challenges that constrain effective stakeholder participation in water-resources management.
Tipo: Report
Palavras-chave: Water resource management; Analysis; Irrigation management; Participatory management; Water users’ associations; Research methods; Agrarian reform; Irrigation programs; Operations; Maintenance; Conflict; Rivers; Kyrgyzstan; Agribusiness; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/53066

Calculation of multivariate normal probabilities by simulation, with applications to maximum simulated likelihood estimation
Provedor de dados: 31
Autores: Cappellari,   Lorenzo; Jenkins,   Stephen P.
We discuss methods for calculating multivariate normal probabilities by simulation and two new Stata programs for this purpose: mdraws for deriving draws from the standard uniform density using either Halton or pseudorandom sequences, and an egen function, mvnp(), for calculating the probabilities themselves. Several illustrations show how the programs may be used for maximum simulated likelihood estimation.
Tipo: Journal Article
Palavras-chave: Mdraws; Egen function mvnp(); Simulation estimation; Maximum simulated likelihood; Multivariate probit; Halton sequences; Pseudorandom sequences; Multivariate normal; GHK simulator; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117568

Using the file command to produce formatted output for other applications
Provedor de dados: 31
Autores: Slaymaker,   Emma.
The file command provides a way to produce tables for use in other application software. It can be especially useful for combining descriptive results (such as means and percentages) and results from significance tests. Extracting and manipulating the results directly from Stata matrices gives more control over arrangement, while other Stata functions may be used to control numeric formats. This tutorial includes examples based on survey data of both plain text and HTML output.
Tipo: Journal Article
Palavras-chave: File; Presentation of results; Tables; HTML; Spreadsheets; Word processors; Browsers; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117515

Price Competition with Particle Swarm Optimization: An Agent-Based Artificial Model
Provedor de dados: 31
Autores: Zhang,   Tong; Brorsen,   B. Wade.
This study instructs an artificial price competition market to examine the impact of capacity constraints on the behavior of packers. Results show when there are cattle left for the lowest bidder after all other packers finishing their procurement, the capacity constraints make the price lower than the perfect competition level.
Tipo: Conference Paper or Presentation
Palavras-chave: Fed cattle market; Agent-based model; Particle swarm optimization; Oligopsony; Livestock Production/Industries; Research Methods/ Statistical Methods; D43.
Ano: 2008
URL: http://purl.umn.edu/6780

Speaking Stata: Problems with tables, Part II
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Three user-written commands are reviewed as illustrations of different approaches to tabulation problems, each one step beyond what is possible to do directly through official Stata. tabcount is a wrapper for tabdisp written to produce tables that show how often specified values occur or specified conditions are satisfied so that, in particular, tables may include explicit zeros whenever desired. makematrix is designed for situations in which a table of results may be compiled by populating a matrix. matrix list or list may then be used to display the table. groups shows frequencies of combinations of values using list. Users should find these commands to be helpful additions to the toolkit. Programmers may be interested in examples of the wrapper...
Tipo: Journal Article
Palavras-chave: Tables; Matrices; Tabcount; Makematrix; Groups; Tabdisp; List; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116197

DETERMINANTS OF THE VALUE OF SITE-SPECIFIC INFORMATION (SSI) IN AGRICULTURE: A UNIFYING THEORY TO ANALYZE ITS RELATIVE IMPACTS
Provedor de dados: 31
Autores: Rejesus,   Roderick M.; Nelson,   Carl H.
This paper develops a theoretically consistent behavioral model of farmer decision-making that allows for analysis of the relative impacts of the determinants of SSI value. The model departs from previous literature by assuming that SSI reduces uncertainty, but not eliminate it. Results show  that increasing the accuracy (or the "level of informativeness") of SSI, increasing initial wealth, improving management ability to reduce uncertainty in the posterior, and increasing the uncertainty in the prior, increases the value of SSI. Furthermore, mean input use is found to decrease, as SSI becomes more "informative." On the other hand, the value of SSI is found to be decreasing as relative risk aversion increases.   These results have policy implications for...
Tipo: Conference Paper or Presentation
Palavras-chave: Farm Management; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21779

COOPERATION AND WEALTH
Provedor de dados: 31
Autores: Stark,   Oded.
We calculate the equilibrium fraction of cooperators in a population in which payoffs accrue from playing a single-shot prisoner's dilemma game. Individuals who are hardwired as cooperators or defectors are randomly matched into pairs, and cooperators are able to perfectly find out the type of a partner to a game by incurring a recognition cost. We show that the equilibrium fraction of cooperators relates negatively to the population's level of wealth.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/18763

Approaches for Selecting Product Innovation Projects in U.S. Food and Agribusiness Companies
Provedor de dados: 31
Autores: Roucan-Kane,   Maud; Gray,   Allan W.; Boehlje,   Michael.
www.ifama.org
Tipo: Journal Article
Palavras-chave: Food; Agribusiness; Innovation; Selection method; Portfolio; Functional area; Cluster analysis; Agribusiness; Agricultural Finance; Demand and Price Analysis; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/117599

Polarity in DEA Models
Provedor de dados: 31
Autores: Agrell,   Per J.; Bogetoft,   Peter; Tind,   Jorgen.
This article discusses models in data envelopment analysis (DEA) relaxing the standard convexity assumptions. The basic model treats mutually incomparable pairs of sets to be generated by a procedure proposed earlier. Each pair consists of a consumption set and a production set of feasible input-output combinations. Two fundamental operations by the procedure are based on intersection and convex hull generation in the input-output space. A polarity analysis is performed which, subject to the usual assumptions about free disposability and nonnegativity, appears fruitful to do in the framework of blocking and antiblocking sets. It is shown how this leads to an interchange of the above operations extending some classical results from convex analysis. The last...
Tipo: Working or Discussion Paper
Palavras-chave: Data Envelopment Analysis; Polarity; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/24188

A Larger Slice or a Larger Pie? An Empirical Investigation of Bargaining Power in the Distribution Channel
Provedor de dados: 31
Autores: Draganska,   Michaela; Klapper,   Daniel; Villas-Boas,   Sofia Berto.
This research aims to provide insights into the determinants of channel profitability and the relative power in the channel by considering consumer demand and the interactions between manufacturers and retailers in an equilibrium model. In a departure from the standard empirical channel literature, which assumes that manufacturers set wholesale prices unilaterally, we explicitly model the negotiations between manufacturers and retailers. To this end, we formulate a Nash bargaining game to determine wholesale prices and thus how margins are split in the channel. Equilibrium margins are thus a function of demand primitives and of retailer and manufacturer bargaining power. Bargaining power is itself a function of exogenous retail and manufacturer...
Tipo: Working or Discussion Paper
Palavras-chave: Demand and Price Analysis; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/6054

A LINEAR PROGRAMMING SOLUTION TO SOME MARKET ALLOCATION PROBLEMS
Provedor de dados: 31
Autores: Piggott,   Roley R.
Certain market allocation problems involving linear average net revenue functions can be solved by linear programming. The technique can be applied to an objective function derived from linear marginal net revenue functions, the objective being to force each marginal net revenue as near to zero as possible given the constraint set. If a particular problem is suited to a linear programming solution, researchers may prefer to use this technique rather than more sophisticated optimization methods.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/22550

TESTING FOR INPUT AND OUTPUT SEPARABILITY IN NEBRASKA AGRICULTURE SECTOR
Provedor de dados: 31
Autores: Shaik,   Saleem; Helmers,   Glenn A.
The existence of Weak Separability aggregates of inputs and outputs is tested using a Translog production and input requirement function for the Nebraska Agricultural sector for 1936-1994.  A separability test was performed only after testing time series properties by comparing the null hypothesis of stationarity against the alternative of unit roots.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20863

AUTOREGRESSIVE CONDITIONAL HETEROSKEDASTICY UNDER ERROR-TERM NON-NORMALITY
Provedor de dados: 31
Autores: Ramirez,   Octavio A.
This paper explores the impact of error-term non-normality on the performance of the normal-error Generalized Autoregressive Conditional Heteroskedastic (GARCH) model under small and moderate sample sizes. A non-normal-, asymmetric-error GARCH model is proposed, and its finite-sample performance is evaluated in comparison to the normal-error GARCH under various underlying error-term distributions. The results suggest that one must be skeptical of using the normal-error GARCH when there is evidence of conditional error-term non-normality. The conditional distribution of the error-term in a previous mainstream application of the normal GARCH is found to be non-normal and asymmetric. The same application is used to illustrate the advantages of the proposed...
Tipo: Conference Paper or Presentation
Palavras-chave: Error- term non-normality; Skewness; Autoregressive conditional heteroskedasticity; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/20595

The Semivariance-Minimizing Hedge Ratio
Provedor de dados: 31
Autores: Turvey,   Calum G.; Nayak,   Govindaray.
This study presents a new approach to the optimal hedging decision. In some empirical studies, the standard hedge using the mean-variance hedge ratio provides results which are inconsistent with downside risk management. The new approach taken here relates the optimal hedge ratio to semivariance rather than variance. An algorithm to solve for the minimum semivariance hedge is presented, and applied to hedging Kansas City wheat and Texas steers.
Tipo: Journal Article
Palavras-chave: Downside risk; Optimal hedging ratio; Risk management; Semivariance hedge ratio; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/30720

THE USE OF FOLLOW-UP QUESTIONS TO NO RESPONSES IN DICHOTOMOUS CHOICE CONTINGENT VALUATION SURVEYS
Provedor de dados: 31
Autores: Curtis,   John A.
The dichotomous choice contingent valuation survey format collects inexact information on willingness to pay (WTP), that is, whether WTP is greater or less than the bid price.  Sometimes researchers make the precise conjecture that certain respondents have zero WTP using information from follow-up motive questions.  But follow-up questions are designed to provide information on respondents' motives, not refined information on the magnitude of WTP.  Assuming that certain respondents have WTP = $0.00 is beyond the design of follow-up questions.  The paper's results show that unless information from follow-up questions is utilized within the limitations of survey design, welfare and model parameter estimates are likely to have high standard errors leading to...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/31427

Sustaining surface and groundwater resources; Proceedings of the Internatinal Workshop on Conjunctive Water Management for Sustainable Irrigated Agriculture in South Asia, April 16-17, 2002 Lahore, Pakistan
Provedor de dados: 31
Tipo: Presentation
Palavras-chave: Water resource management; Conjunctive use; Surface water; Groundwater; Models; Crop production; Water requirements; Water balance; Water table; Sustainable agriculture; Environmental sustainability; Supplementary irrigation; Water quality; Rain; Pumping; Salinity control; Remote sensing; GIS; Water scarcity; Farm income; Institutional development; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2002
URL: http://purl.umn.edu/118417

Linking of Repeated Games. When Does It Lead to More Cooperation and Pareto Improvements?
Provedor de dados: 31
Autores: von Mouche,   Pierre; Folmer,   Henk.
Linking  of repeated games and exchange of concessions in fields of relative strength may lead to more cooperation and to Pareto improvements relative to the situation where each game is played separately. In this paper we formalize these statements,  provide some general results concerning the conditions for more cooperation and Pareto improvements to materialize or not and analyze the relation between both. Special attention is paid to the role of asymmetries.
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Policy; Linking; Folk Theorem; Tensor Game; Prsioners; Full Cooperation; Pareto Efficiency; Minkowski Sum; Vector Maximum; Convex Analysis; Research Methods/ Statistical Methods; C72.
Ano: 2007
URL: http://purl.umn.edu/9557

Detecting Starting Point Bias in Dichotomous-Choice Contingent Valuation Surveys
Provedor de dados: 31
Autores: Alberini,   Anna; Veronesi,   Marcella; Cooper,   Joseph C.
We examine starting point bias in CV surveys with dichotomous choice payment questions and follow-ups, and double-bounded models of the WTP responses. We wish to investigate (1) the seriousness of the biases for the location and scale parameters of WTP in the presence of starting point bias; (2) whether or not these biases depend on the distribution of WTP and on the bids used; and (3) how well a commonly used diagnostic for starting point bias—a test of the null that bid set dummies entered in the right-hand side of the WTP model are jointly equal to zero—performs under various circumstances. Because starting point bias cannot be separately identified in any reliable manner from biases caused by model specification, we use simulation approaches to address...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/12230

MODELLING THE EFFECTIVENESS OF CROSS-COMPLIANCE UNDER ASYMMETRIC INFORMATION
Provedor de dados: 31
Autores: Bartolini,   Fabio; Gallerani,   Vittorio; Raggi,   Meri; Viaggi,   Davide.
The effects of cross-compliance depend on the strategies of participation/compliance of farmers, as well as on the ability of public administration to design appropriate mechanisms of control and sanctions. The objective of this paper is to present a reference framework for the analysis of cross-compliance under asymmetric information and to test the empirical relevance of the problem. The methodology is applied to a case study represented by the province of Bologna (Italy). The results show that, in the present conditions of control and sanctions, only a small share of farms is interested in complying with cross-compliance. The profitability of the choice of compliance/noncompliance depends mainly on the amount of single farm payment entitlements compared...
Tipo: Conference Paper or Presentation
Palavras-chave: Cross-compliance; Asymmetric information; Single farm payment; Agricultural Finance; Farm Management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6670

Conditional Skewness of Aggregate Market Returns
Provedor de dados: 31
Autores: Charoenrook,   Anchada; Daouk,   Hazem.
The skewness of the conditional return distribution plays a significant role in financial theory and practice. This paper examines whether conditional skewness of daily aggregate market returns is predictable and investigates the economic mechanisms underlying this predictability. In both developed and emerging markets, there is strong evidence that lagged returns predict skewness; returns are more negatively skewed following an increase in stock prices and returns are more positively skewed following a decrease in stock prices. The empirical evidence shows that the traditional explanations such as the leverage effect, the volatility feedback effect, the stock bubble model (Blanchard and Watson, 1982), and the fluctuating uncertainty theory (Veronesi,...
Tipo: Working or Discussion Paper
Palavras-chave: Conditional skewness; Conditional Volatility; Predicting Skewness; Aggregate market returns; International finance; Financial Economics; Marketing; Research Methods/ Statistical Methods; G12; C1.
Ano: 2009
URL: http://purl.umn.edu/51181

Comparison of Complete Combinatorial and Likelihood Ratio Tests: Empirical Findings from Residential Choice Experiments
Provedor de dados: 31
Autores: Ohdoko,   Taro.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6173

Making Impact Assessment More Participatory
Provedor de dados: 31
Autores: Simanowitz,   Anton; Johnson,   Susan; Gaventa,   John.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/23753

Saving the World but Saving Too Much? Pure Time Preference and Saving Rates in Integrated Assessment Modelling
Provedor de dados: 31
Autores: Smith,   Kathryn.
* The current version of this paper was prepared with the support of the Australian Department of Climate Change and the Environmental Economics Research Hub at the Australian National University. Earlier versions were submitted to the London School of Economics and Political Science in partial completion of the MSc in Environment and Development, and to the 2009 annual conference of the Australian Agricultural and Resource Economics Society (AARES). The author is extremely grateful to Simon Dietz and the Commonwealth Scholarship Commission for supervision and funding of the MSc, respectively, and to Steve Hatfield-Dodds, Frank Jotzo, Jack Pezzey, Matthew Skellern, Daniel Veryard, and participants in seminars at the AARES conference, the Department of...
Tipo: Report
Palavras-chave: Climate economics; Integrated assessment models; Economic models; Social costs.; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/94888

The MODERE Model and The Economic Analysis of Farmers’ Decisions
Provedor de dados: 31
Autores: Gomez Gomez,   Carlos Mario; Gutierrez,   Carlos.
The MODERE, the Ministry of the Environment Irrigation Decision Model, is a simulation tool which uses mathematical programming methods to reveal the implicit multiattribute objective function lying behind the observed cropping decision. The model takes different criteria such as profit maximization, risk aversion, avoidance of management complexities and so forth into account. In order to determine the feasible combination of attributes of this objective function the model considers the production possibility frontier explicitly as depending on market prices, policy incentives, availability of production factors, water irrigation facilities agronomic vocation and other constraints. Once calibrated the model becomes a powerful tool to assess the impact of...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural Economics; Water Economics; Simulated Models; Land Economics/Use; Political Economy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6492

Estimation of Production Functions using Average Data
Provedor de dados: 31
Autores: Salois,   Matthew J.; Livanis,   Grigorios T.; Moss,   Charles B.
Agricultural economists rely on aggregated data at various levels depending on data availability and the econometric techniques employed. However, the implication of aggregation on economic relationships remains an open question. To examine the impact of aggregation on estimation, Monte Carlo techniques and data are employed on production practices.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/35401

Multiple imputation of missing values: further update of ice, with an emphasis on interval censoring
Provedor de dados: 31
Autores: Royston,   Patrick.
Multiple imputation of missing data continues to be a topic of considerable interest and importance to applied researchers. In this article, the ice package for multiple imputation is further updated. Special attention in this article is paid to imputing interval-censored observations, and a suggestion to use imputation of right-censored survival data to elucidate covariate effects graphically.
Tipo: Article
Palavras-chave: Ice; Uvis; Micombine; Ice_reformat; Multiple imputation; Interval censoring; Visualization; Censored survival data; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119290

MULTIATTRIBUTE UTILITY THEORY, MULTIPLE OBJECTIVES AND UNCERTAINTY IN EX ANTE PROJECT EVALUATION
Provedor de dados: 31
Autores: Dillon,   John L.; Perry,   Chad.
A wide variety of methods have been suggested for ex ante project appraisal. The most logical and complete of these appears to be multiattribute utility theory (MAUT) which provides a formal procedure for handling the difficulties of ex ante evaluation arising from multiple objectives, intangibles, time-sequence effects and uncertainty. MAUT procedures, comprising an extension of subjective expected utility procedures to choice between multi attributed alternatives, are described and applied to an illustrative example.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/9180

IMPORTANCE OF CAP REFORMS FOR THE DUTCH AGRICULTURAL SECTOR IN 2000-2020
Provedor de dados: 31
Autores: Tabeau,   Andrzej A.; van Leeuwen,   Myrna.
Since 2000, the two important reforms of The EU Common Agricultural Policy (CAP) took place. The Agenda 2000 Berlin Agreement of March 1999 aimed to increase EU agriculture market orientation and focuses on the grain, oilseed, dairy and the beef sectors. It reduced intervention prices in these sectors and lowered the set-aside requirements for crops and by implementation of non-crop specific compensatory payments. The core of The Luxembourg Agreement from June 2003 was an acceleration of decoupling of farm support initiated by the Agenda 2000 complementary payment. It introduces a system of direct payments (known as single payment scheme - SPS), which are no longer linked to the production (decoupling). This CAP reform also includes commodity specific...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP; CAP Reform; Dutch agriculture; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q10; Q18.
Ano: 2008
URL: http://purl.umn.edu/44815

NACHBARSCHAFTS- UND KONJUNKTUREFFEKTE: ZUR AUFGABEWAHRSCHEINLICHKEIT LANDWIRTSCHAFTLICHER BETRIEBE
Provedor de dados: 31
Autores: Margarian,   Anne.
D2_1
Tipo: Conference Paper or Presentation
Palavras-chave: Structural change; Farm-exits; Propensity; Proximity effect; Agricultural and Food Policy; Farm Management; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93961

Measurement of Yield distribution: A Time-Varying Distribution Model
Provedor de dados: 31
Autores: Yang,   Tsung Yu.
Regarding the nature of yield data, there are two basic characteristics that need to be accommodated while we are about to model a yield distribution. The first one is the nonstationary nature of the yield distribution, which causes the heteroscedasticity related problems. The second one is the left skewness of the yield distribution. A common approach to this problem is based on a two-stage method in which the yields are detrended first and the detrended yields are taken as observed data modeled by various parametric and nonparametric methods. Based on a two-stage estimation structure, a mixed normal distribution seems to better capture the secondary distribution from catastrophic years than a Beta distribution. The implication to the risk management is...
Tipo: Conference Paper or Presentation
Palavras-chave: Time-Varying Distribution; Mixture Distribution; Crop Insurance; Agricultural Finance; Crop Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/103422

Stata in space: Econometric analysis of spatially explicit raster data
Provedor de dados: 31
Autores: Mueller,   Daniel.
Realizing the importance of location, economists are increasingly adopting spatial analytical and spatial econometric perspectives to study questions such as the geographical targeting of policy interventions, regional agglomeration effects, the diffusion of technologies across space, or causes and consequences of land-cover change. Explicitly accounting for location in econometric estimations can be of great benefit for researchers working at the interface of economics or environmental sciences and geography.  The objective of this article is to demonstrate how spatially explicit raster data derived from standard geographical information system (GIS) software can be used within Stata. Three programs implemented as ado-files are presented. These import...
Tipo: Journal Article
Palavras-chave: Ras2dta; Spatsam; Dta2ras; Geographical information systems (GIS); Raster data; Spatial modeling; Spatial econometrics; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117514

LEVELS, DIFFERENCES AND ECMS - PRINCIPLES FOR IMPROVED ECONOMETRIC FORECASTING
Provedor de dados: 31
Autores: Allen,   P. Geoffrey; Fildes,   Robert.
An avalanche of articles has described the testing of a time series for the presence of unit roots. However, economic model builders have disagreed on the value of testing and how best to operationalise the tests. Sometimes the characterization of the series is an end in itself. More often, unit root testing is a preliminary step, followed by cointegration testing, intended to guide final model specification. A third possibility is to specify a general vector autoregression model, then work to a more specific model by sequential testing and the imposition of parameter restrictions to obtain the simplest data-congruent model 'fit for purpose'. Restrictions could be in the form of cointegrating vectors, though a simple variable deletion strategy could be...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/14501

Review of Multilevel and Longitudinal Modeling Using Stata by Rabe-Hesketh and Skrondal
Provedor de dados: 31
Autores: Wolfe,   Rory.
This article reviews Multilevel and Longitudinal Modeling Using Stata, by Rabe-Hesketh and Skrondal.
Tipo: Journal Article
Palavras-chave: Longitudinal; Multilevel; Gllamm; Generalized latent variable model; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117563

CLIMATE CHANGE INFLUENCES ON THE RISK OF AVIAN INFLUENZA OUTBREAKS AND ASSOCIATED ECONOMIC LOSS
Provedor de dados: 31
Autores: Mu,   Jianhong H.; McCarl,   Bruce A.; Wu,   Ximing; Gan,   Li.
This paper examines the effect that climate has on Avian Influenza outbreak probability.  The statistical analysis shows across a broad region the probability of an outbreak declines by 0.22% when the temperature rises 1 Celsius degree and increases by 0.34% when precipitation increases by 1millimeter. These results indicate that the realized climate change of the last 20 years not only has been a factor behind recent HPAI outbreaks, but that climate change is likely to play an even greater role in the future.  The statistical results indicate that overall, the risk of an AI outbreak has been increased by 51% under past climate change and 3-4% under future climate change. An economic evaluation shows the increased probability of outbreaks has caused...
Tipo: Conference Paper or Presentation
Palavras-chave: Climate change; Avian Influenza outbreaks; GDP loss; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103637

Variance estimation for the instrumental variables approach to measurement error in generalized linear models
Provedor de dados: 31
Autores: Hardin,   James W.; Carroll,   Raymond J.
This paper derives and gives explicit formulas for a derived sandwich variance estimate. This variance estimate is appropriate for generalized linear additive measurement error models fitted using instrumental variables. We also generalize the known results for linear regression. As such, this article explains the theoretical justification for the sandwich estimate of variance utilized in the software for measurement error developed under the Small Business Innovation Research Grant (SBIR) by StataCorp. The results admit estimation of variance matrices for measurement error models where there is an instrument for the unknown covariate.
Tipo: Journal Article
Palavras-chave: Sandwich estimate of variance; Measurement error; White's estimator; Robust variance; Generalized linear models; Instrumental variables; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116177

The Price Shock Transmission during the 2007-2008 Commodity Bull Cycle: A Structural Vector Auto-Regression Approach to the "Chicken-or-Egg" Problem
Provedor de dados: 31
Autores: Power,   Gabriel J.; Vedenov,   Dmitry V.
Commodity and energy prices have exhibited an unprecedented increase between October 2006 and July 2008, only to fall sharply during the last months of 2008. Many explanations have been offered to this phenomenon, including steadily increasing demand from China and India, large mandated increases in ethanol production, droughts in some key agricultural producer countries, production plateaus in some major oil-producing countries, refinery capacity limits, demand pressure from the derivatives market owing to the diversification properties of commodities, etc. Clearly, agricultural input, output, and energy products are closely related economically. In addition to biofuels, the connection points include nitrogen-based solution liquid fertilizers, fossil...
Tipo: Conference Paper or Presentation
Palavras-chave: Commodity prices; Commodity bull cycle; Energy prices; Granger-causality; Graph theory; Structural VAR.; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Demand and Price Analysis; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49538

Stata tip 25: Sequence index plots
Provedor de dados: 31
Autores: Kohler,   Ulrich; Brzinsky-Fay,   Christian.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117550

Stata tip 41: Monitoring loop iterations
Provedor de dados: 31
Autores: Harrison,   David A.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119262

INTRODUCTION TO STATISTICS FOR AGRICULTURAL ECONOMISTS USING SPSS
Provedor de dados: 31
Autores: Swinton,   Scott M.; Labarta,   Ricardo A.
This document is a primer in statistics for applied economists using the SPSS statistical software. It is intended for use with a one-week training workshop designed to acquaint research professionals with basic statistical procedures for analyzing socio-economic survey data. The document introduces users to database creation and manipulation, exploratory univariate and bivariate statistics, hypothesis testing, and linear and logit regression. The text is supported with 19 text boxes that illustrate how procedures can be applied to a farm survey dataset.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/11747

Analysis of Flue-cured Tobacco Supply Elasticity in Zimbabwe 1980-2010: An Error Correction Model Approach
Provedor de dados: 31
Autores: Pfumayaramba,   Tichaona.
Flue cured tobacco has been an important crop for the Zimbabwean economy historically in terms of foreign currency earnings and employment creation. Between 1980 and 2000, there is a general increase in tobacco output, followed by a sharp decline from 2001 up to 2008 and then output starts to increase again. Flue cured tobacco output as measured by the quantity that is delivered to the auction floors is used to estimate supply elasticity. The objective is to determine if flue-cured tobacco supply is price elastic and whether price incentives alone will boost supply in the short -run. Time series data on flue cured tobacco output, prices, production costs, prices of major competing crops, the exchange rates and inflation are analysed to model the price...
Tipo: Conference Paper or Presentation
Palavras-chave: Supply elasticity; Stationary data; Cointegration; Error correction model.; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/100696

Stata tip 51: Events in intervals
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119289

Relationship between the industrial structure and economic growth of Guangdong Province
Provedor de dados: 31
Autores: Li,   Qian; Li,   Hong-yun.
We quantitatively analyze the relationship between the industrial structure and economic growth in Guangdong Province of China from 1980 to 2006 by impulse response function and variance decomposition on the basis of the establishment of VAR model. Result shows that there is a long-term, stable and balanced relationship between the industrial structure and the actual economic growth in Guangdong Province with a reverse amendment mechanism. The industrial structure has a significant influence on the economic growth of Guangdong Province, but there is a certain lag phase of this influence. Economic growth has dependence on the industrial structure, which is showed by the structure of production value.
Tipo: Thesis or Dissertation
Palavras-chave: Industrial structure; VAR model; Impulse response function; China; Community/Rural/Urban Development; Financial Economics; Industrial Organization; Production Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53484

A Noncooperative Model of Collective Decision Making: A Multilateral Bargaining Approach
Provedor de dados: 31
Autores: Rausser,   Gordon C.; Simon,   Leo K.
This paper extends the Stahl-Rubinstein model of bilateral bargaining to incorporate many players and multidimensional issue spaces. A central feature of our framework is that in each round of negotiations, a proposer is selected randomly. Our bargaining model consists of a sequence of finite-horizon games, in which the horizon increases without bound. A solution to our model is a limit of equilibrium outcomes for the finite horizon games. A necessary condition for existence of a deterministic solution is that the limit outcome belongs to the core of the underlying bargaining problem. Solutions, if they exist, are generically unique. Two sets of sufficiency conditions for existence are presented. The paper concludes with examples and applications. In...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/7198

Intra-class correlation in random-effects models for binary data
Provedor de dados: 31
Autores: Rodriguez,   German; Elo,   Irma.
We review the concept of intra-class correlation in random-effects models for binary outcomes as estimated by Stata’s xtprobit, xtlogit, and xtclog. We consider the usual measures of correlation based on a latent variable formulation of these models and note corrections to the last two procedures. We also discuss alternative measures of association based on manifest variables or actual outcomes and introduce a new command xtrho for computing these measures for all three types of models.
Tipo: Journal Article
Palavras-chave: Intra-class correlation; Random-effects; Probit; Logit; Complementary log-log; Pearson's r; Yule's Q; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116030

Judgment and Analysis on the Success &amp; Failure of Modern Sericultural Industry Development
Provedor de dados: 31
Autores: Wang,   Daigang.
Firstly, the basic core of judgment and analysis on the success and failure of modern sericultural industry development is introduced. The cocoon silk is the original reference to judge the success and failure of modern sericultural industry development. And the cocoon weight of per unit mulberry is the core index to judge the comprehensive production efficiency and the success or failure of sericultural industry, while the consistence between characteristics of decision index and production technology is the main way to judge the success or failure of sericultural industry. Secondly, the new characteristics of modern sericultural industry development and change have been analyzed. The primitive consciousness and basic goal of modern sericultural industry...
Tipo: Thesis or Dissertation
Palavras-chave: Sericulture industry; Development decision; Index system; Values; China; Industrial Organization; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/54028

Applying Experimental Economics to Obesity in the Family Household
Provedor de dados: 31
Autores: Ehmke,   Mariah D.; Warziniack,   Travis; Schroeter,   Christiane; Morgan,   Kari.
The objective of this study is to identify experimental economic tools that can be employed to explain the role of economic behavior in overweight and obesity in the household. We identify three economic experiments that can be used to understand how parent-child economic relationships relate to obesity. Loss aversion experiments are discussed as a tool to understand challenges some individuals face in achieving a healthy diet. Finally, testbed experiments are introduced as a means to test and understand new policies and incentives for better health at the household level.
Tipo: Journal Article
Palavras-chave: Carrot stick; Child obesity; Discount rate; Generosity; Loss aversion; Parent-child; Punishment; Trust; Agribusiness; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; I19; Q18; D01; D63.
Ano: 2008
URL: http://purl.umn.edu/47198

USING ABSOLUTE DEVIATIONS TO COMPUTE LINES OF BEST FIT
Provedor de dados: 31
Autores: Houck,   James P.; Hunt,   R.D.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1968
URL: http://purl.umn.edu/13732

Reducing Poverty through Investments in Agricultural Water Management: Poverty and Gender Issues and Synthesis of Sub-Saharan Africa Case Study Reports
Provedor de dados: 31
Autores: van Koppen,   Barbara; Namara,   Regassa E.; Safilios-Rothschild,   Constantina.
Tipo: Working or Discussion Paper
Palavras-chave: Irrigated farming; Investment; Poverty; Gender; Cropping systems; Labor; Manual pumps; Case studies; Crop Production/Industries; Labor and Human Capital; Public Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/92404

Updating the Estimation of the Supply of Storage Model
Provedor de dados: 31
Autores: Zulauf,   Carl R.; Zhou,   Haijiang; Roberts,   Matthew C.
An updated supply of storage equation is estimated to reflect recent developments in the theoretical and empirical literature.  Among the findings is an inverse relationship between storage cost adjusted price spread and a proxy measure of convenience yield, and a curvilinear relationship between stocks-to-use ratio and implied volatility.
Tipo: Conference Paper or Presentation
Palavras-chave: Supply of storage; Implied volatility; Convenience yield; Research Methods/ Statistical Methods; Q11; Q14; G10.
Ano: 2005
URL: http://purl.umn.edu/19122

Choques monetários e cambiais e preços relativos na economia brasileira: 1990-2000
Provedor de dados: 31
Autores: Cunha,   Cleyzer Adrian da; Vieira,   Wilson da Cruz.
Neste trabalho analisou-se o comportamento de preços agrícolas e industriais em resposta a choques monetários e cambiais não-antecipados na economia brasileira, no período de janeiro de 1990 a dezembro de 2000. Considerou-se um ambiente econômico em que há perfeita mobilidade de capital entre a economia doméstica e o resto do mundo, existe arbitragem internacional no mercado de commodities agrícolas e os bens industriais domésticos são substitutos imperfeitos dos seus equivalentes importados. Desenvolveu-se um modelo teórico na mesma linha dos chamados modelos de overshooting. Os resultados empíricos encontrados corroboram a hipótese de que os preços agrícolas respondem mais intensamente, no curto prazo, aos choques monetários e cambiais não-antecipados,...
Tipo: Journal Article
Palavras-chave: Preços relativos; Política cambial; Choques monetários; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/56847

Value Sharing and Food System Dynamics for Milk, Tomato, and Cereals Food Chains
Provedor de dados: 31
Autores: Bertazzoli,   Aldo; Ghelfi,   Rino; Rivaroli,   Sergio; Samoggia,   Antonella.
The aim of the paper is to analyse value sharing and food system dynamics of milk, tomato, and cereals food chains, so to explore the agro‐food enterprises capacity to be competitive and sustainable. The paper is based on the functionalist approach of Malassis and the notion of the system of the General Systems Theory. The methodology is aimed at creating a consolidated financial statement for each food chain so to re‐create the chain value and identify how this is shared among the different food chain stages. The analysis is carried out on primary and secondary data: around 2400 financial statements concerning 480 enterprises from 2003 to 2007 and stakeholders’ interviews. Results show that value is usually created in the processing and distribution...
Tipo: Conference Paper or Presentation
Palavras-chave: Food chain; Value system; Economic performance; Potato; Fruit; Cheese; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100509

Time Series Analysis
Provedor de dados: 31
Autores: Diebold,   F.X.; Kilian,   L.; Nerlove,   Marc.
We provide a concise overview of time series analysis in the time and frequency domains, with lots of references for further reading.
Tipo: Working or Discussion Paper
Palavras-chave: Time series analysis; Time domain; Frequency domain; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/28556

Simulation of Alternative Marketing Strategies for U.S. Cotton
Provedor de dados: 31
Autores: Elrod,   Christopher P.; Robinson,   John R.C.; Richardson,   James W.
Three marketing strategies (selling a put option, cash sale at harvest, and cash sale in June) are simulated based on historical values and ranked based on certainty equivalents for a representative irrigated and dryland cotton farm Scenario analysis is also used to compare varying yield values.
Tipo: Conference Paper or Presentation
Palavras-chave: Simulation; Marketing; Cotton; Risk; Marketing; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6885

Stata tip 46: Step we gaily, on we go
Provedor de dados: 31
Autores: Williams,   Richard.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119276

The U.S. Agricultural Sector and the Macroeconomy
Provedor de dados: 31
Autores: Baek,   Jungho; Koo,   Won W.
The effects of the exchange rate, the U.S. agricultural price, the domestic income, and the interest rate on the U.S. net farm income are investigated in a cointegration framework. For this purpose, the Phillips-Hansen fully-modified cointegration (FM-OLS) procedure is applied to annual data for the period 1957–2008. Results suggest that there exists the long-run equilibrium relationship between the U.S. net farm income and the selected macroeconomic variables. We also find that the exchange rate and U.S. agricultural price are more important than other variables in determining the U.S. net farm income.
Tipo: Journal Article
Palavras-chave: Agricultural price; Exchange rate; Gross domestic product; Interest rate; Net farm income; Phillips-Hansen fully-modified cointegration technique; Agribusiness; Agricultural Finance; Land Economics/Use; Production Economics; Research Methods/ Statistical Methods; C22; E23; Q11.
Ano: 2010
URL: http://purl.umn.edu/92580

Finding a sustainable linkage between the emerging farmer and formal markets: The case of pick ‘n pay and the Zanyokwe farmers in the eastern Cape of South Africa
Provedor de dados: 31
Autores: Bediako,   J.A.; Debrah,   Kofi.
A major problem confronting rural and emerging farmers is the marketing of their products. Most of the farmers encountered depend on the local or village markets which are often saturated or purchases are not backed by effective demand to make sales meaningful for the desired benefits. Small scale South African farmers have not been able to access the formal sector to sell their goods. There are several reasons for this which is linked to the nature of the historical evolution of the South African agricultural sector and in particular the food production system. Recently, it has been argued that the small scale farmers are not able to meet the standards that are set by the formal sector and are therefore responsible for their own exclusion by producing...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Labor and Human Capital; Livestock Production/Industries; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/51993

Information Reference Models for European Pork Supply Networks
Provedor de dados: 31
Autores: Lehmann,   Richard J.; Fritz,   Melanie; Schiefer,   Gerhard.
Several global developments such as diminishing production resources, limits in the availability of water and the growing demand for bio-energy as well as sector-wide crises (e.g. BSE, swine fever, dioxin) have led to a changing attitude of society towards the conse-quences of the food system‘s activities for social, economic and environmental issues, cap-tured in the term of sustainability. As a consequence, consumers show increasing interest in the characteristics of food, and in turn, on the availability of related information and guaran-tees. The paper introduces different information reference models for European pork supply networks, which give an aggregated overview about information availability and exchange in the pork sector, identify additional...
Tipo: Presentation
Palavras-chave: Information Modelling; Reference Modelling; Food Safety; Quality; Global Warm-ing Potential; Agribusiness; Agricultural and Food Policy; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/122014

Research Evaluation to Increase Impact
Provedor de dados: 31
Autores: Templeton,   Deborah J.
Research evaluation, undertaken throughout the life of the research activity, is an important tool for research managers. When correctly implemented, research evaluation can help to increase the success of existing and future research projects and programs, thereby increasing the social, economic and/or environmental impact of the research. The relationship between the life-cycle of the research project and the type of evaluation determines the appropriate type of evaluation to be undertaken. Given the value of research evaluation, and the recent development of user-friendly evaluation procedures and models, management of a R&amp;D portfolio can benefit from increased evaluation effort at the project, program and organisational levels.
Tipo: Conference Paper or Presentation
Palavras-chave: Research evaluation; Research-to-impact pathway; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/58264

USING INPUT-OUTPUT (I-O) ANALYSIS IN EVALUATING CONSERVATION PROGRAMS AND PROJECTS: LESSONS LEARNED FROM EVALUATION OF THE CONSERVATION RESERVE PROGRAM (CRP)
Provedor de dados: 31
Autores: Leistritz,   F. Larry.
This paper describes the use of input-output modeling in estimating the economic impacts of the conservation reserve program (CRP) in North Dakota, discusses challenges faced in conducting the analysis, and examines lessons learned from the study.  The study had two major phases: (1)  a statewide survey of CRP participants was conducted to determine selected characteristics of those individuals and their enrolled land that would be important for subsequent impact estimation and (2) a regional input-output model was used to estimate the indirect effects of the CRP program for each of the state's five pool groups.  The results of this analysis indicated that the impacts of the Conservation Reserve Program on the North Dakota economy were relatively modest....
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1998
URL: http://purl.umn.edu/20850

Blood for Social Status: Preliminary Evidence from Rural China
Provedor de dados: 31
Autores: Chen,   Xi; Zhang,   Xiaobo.
Xi Chen acknowledges generous Doctoral Research Grant from the Institute for the Social Sciences at Cornell University and precious data set provided by the Development Strategy and Governance Division at IFPRI. Conference Travel Grant provided by the Department of Applied Economics and Management at Cornell is also acknowledged.  We are grateful to Ravi Kanbur for invaluable comments, guidance and encouragement. This paper also benefited from helpful discussion and invaluable comments from Robert Frank, David Sahn, Marc Rockmore, and seminar participants in the Department of Economics at Cornell. Due to time limit, I have not incorporated all helpful comments and suggestions in this early draft paper. The views expressed herein and any remaining errors...
Tipo: Conference Paper or Presentation
Palavras-chave: Blood Donation; Social Status; Poverty; Inequality; Relative Deprivation; Rural China; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Demand and Price Analysis; Health Economics and Policy; Institutional and Behavioral Economics; International Development; Labor and Human Capital; Political Economy; Production Economics; Public Economics; Research Methods/ Statistical Methods; Risk and Uncertainty; I32; J22; D13; D63.
Ano: 2009
URL: http://purl.umn.edu/49411

A SPATIAL ECONOMETRIC STAR MODEL WITH AN APPLICATION TO U.S. COUNTY ECONOMIC GROWTH, 1969–2003
Provedor de dados: 31
Autores: Pede,   Valerien O.; Florax,   Raymond J.G.M.; Holt,   Matthew T.
Spatial regression models incorporating non-stationarity in the regression coefficients are popular. We propose a spatial variant of the Smooth Transition AutoRegressive (STAR) model that is more parsimonious than commonly used approaches and endogenously determines the extent of spatial parameter variation. Uncomplicated estimation and inference procedures are demonstrated using a neoclassical convergence model for United States counties.
Tipo: Working or Discussion Paper
Palavras-chave: Spatial autoregression; Smooth transition; Spatial econometrics; STAR; GWR; Community/Rural/Urban Development; Labor and Human Capital; Political Economy; Research Methods/ Statistical Methods; C21; C51; R11; R12.
Ano: 2009
URL: http://purl.umn.edu/48117

A wine market and marketing analysis of Wine Specialities from the Tokaj-Hegyalja Wine District
Provedor de dados: 31
Autores: Szakal,   Zoltan.
Tokaj Wine Specialities have few competitors and enjoy a rare niche among natural dessert wines since traditions surrounding their preparation, their specific microclimate, and unique taste enable one to utilise marketing tools for branding and market placement. To elaborate the marketing strategy, one needs market information that adequately shows the current situation and trends. During my research, I carried out segmentation for Tokaj Wine Specialities consumers and illustrated the correlations with statistical methods. My research covered the North-Alföld Region and Budapest. I performed a reliability test on the research databases and demonstrated that the areal data set can be integrated. My hypotheses findings also constitute new research.
Tipo: Journal Article
Palavras-chave: Wine marketing; Dessert wine market; Market segmentation; Consumer behaviour; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49195

Has Imported Rice Crowded-out Domestic Rice Production in Ghana? What has Been the Role of Policy?
Provedor de dados: 31
Autores: Asuming-Brempong,   Samuel; Osei-Asare,   Yaw Bonsu.
Commercial rice imports have accounted for approximately 61%, food aid in rice accounted for about 2%, and domestic rice accounted for some 37% per annum of rice consumption in Ghana over the four years between 2000 and 2003. Compared to the 1990s, these figures show a gradual decline in the share of local rice production in the total quantities of rice consumed in the country. On the other hand, the proportion of food aid in rice consumed has remained relatively constant over the period, while the proportion of commercial imports has increased steadily. Using the Engel-Granger residual-based co-integration test, a market integration analysis was explored for imported rice and domestic rice which compared a central market for imported rice and five key...
Tipo: Conference Paper or Presentation
Palavras-chave: Ghana; Market integration Policy; Rice; Production; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Production Economics; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/52002

Multivariate random-effects meta-analysis
Provedor de dados: 31
Autores: White,   Ian R.
Multivariate meta-analysis combines estimates of several related parameters over several studies. These parameters can, for example, refer to multiple outcomes or comparisons between more than two groups. A new Stata command, mvmeta, performs maximum likelihood, restricted maximum likelihood, or method-of-moments estimation of random-effects multivariate meta-analysis models. A utility command, mvmeta_make, facilitates the preparation of summary datasets from more detailed data. The commands are illustrated with data from the Fibrinogen Studies Collaboration, a meta-analysis of observational studies; I estimate the shape of the association between a quantitative exposure and disease events by grouping the quantitative exposure into several categories.
Tipo: Article
Palavras-chave: Mvmeta; Mvmeta_make; Mvmeta_l; Meta-analysis; Multivariate meta-analysis; Individual participant data; Observational studies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122697

SOLUTION OF SPATIAL TRADING SYSTEMS WITH CONCAVE CUBIC PROGRAMMING
Provedor de dados: 31
Autores: MacAulay,   T. Gordon; Batterham,   Robert L.; Fisher,   Brian S.
Standard spatial equilibrium activity analysis models, as developed by Takayama and Judge (1971), are based on linear supply and demand functions and fixed input-output coefficients. Such models are suitable for multiple market level trading systems where the fixed input-output coefficients are appropriate. A primal-dual price form of these models is developed in which the assumption of constant per unit costs of transformation is relaxed. In the case when the average cost curves of transformation are quadratic in nature the problem becomes one that will be termed cubic programming (that is, a cubic objective function and linear and/or quadratic constraints) which is solved in a concave region of the solution space. In the paper, the formulation of a...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/22998

HEDONIC PRICE FUNCTIONS: GUIDANCE ON EMPIRICAL SPECIFICATION
Provedor de dados: 31
Autores: Kuminoff,   Nicolai V.; Parmeter,   Christopher F.; Pope,   Jaren C.
The hedonic pricing model is widely accepted as a method for estimating the marginal willingness to pay for spatially delineated amenities. Empirical applications typically rely on one of three functional forms—linear, semi-log, and double-log—and rarely involve rigorous specification testing. This phenomenon is largely due to an influential simulation study by Cropper, Deck and McConnell (CDM) (1988) that found, among other things, that simpler linear specifications outperformed more flexible functional forms in the face of omitted variables. In the 20 years that have elapsed since their study, there have been major computational advances and significant changes in the way hedonic price functions can be estimated. The purpose of our paper is to update and...
Tipo: Conference Paper or Presentation
Palavras-chave: Hedonic; Functional Form; Monte Carlo Simulation; Property Value Model; Demand and Price Analysis; Land Economics/Use; Research Methods/ Statistical Methods; Q15; Q51; Q53; C15; R52.
Ano: 2008
URL: http://purl.umn.edu/6555

MARKETING RESEARCH TECHNIQUES OF SMALL- TO MEDIUM-SIZED FOOD PROCESSORS IN THE PACIFIC NORTHWEST
Provedor de dados: 31
Autores: Johnson,   Aaron J.; Vega-H,   Esteban.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/27122

Indicators June-09
Provedor de dados: 31
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/124188

CONSUMER PREFERENCE FOR PST-SUPPLEMENT PORK
Provedor de dados: 31
Autores: Halbrendt,   Catherine K.; Pesek,   John D., Jr.; Parsons,   April; Lindner,   Robert K.
Conjoint measurement was used to determine consumer preference for fresh pork produced with genetically engineered porcine somatotropin (pST). A preference model was constructed based on three pork attributes, degree of fat reduction, price, and production technology, which allowed for interactions between attributes to be estimated. Interview surveys were used to collect data in several shopping centres in three Australian cities. Respondents generally preferred leaner pST-supplemented pork, but only at fat reduction levels greater than those possible with conventionally produced pork, and at competitive prices.
Tipo: Journal Article
Palavras-chave: Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/22954

NOT PLAYING THE GAME: NON-PARTICPATION IN REPEATED DISCRETE CHOICE MODELS
Provedor de dados: 31
Autores: von Haefen,   Roger H.; Adamowicz,   Wiktor L.
This paper develops and empirically evaluates alternative econometric strategies for accounting for non-participation - repeated choice of the same alternative or same type of alternative - in data sets that are typically analyzed within the repeated discrete choice framework.  Random coefficient single and double hurdle variants of the repeated discrete choice model are developed and applied to stated preference data.  The empirical results suggest that significant statistical improvements in fit can arise with the single and double models relative to more traditional models.  However, similar to Haab and McConnell's (1996) findings in the context of count data models, these gains are diminished when the analyst accounts for unobserved heterogeneity...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22037

Spatial Asymmetry in Farm-Retail Price Transmission Associated with Fluid Milk Products
Provedor de dados: 31
Autores: Capps,   Oral, Jr.; Sherwell,   Pablo.
Testing for asymmetric price transmission and calculating elasticities of price transmission are of great importance in applied economics.  We analyze the behavior of tests for asymmetry according to the conventional Houck approach and to the von Cramon-Taubadel and Loy error correction model (ECM) approach.  We also estimate the short-run and long-run elasticities of price transmission between the farm and retail levels of the marketing channel for whole milk and two-percent milk for seven U.S. cities by model.  We employ monthly data over the period from January 1994 to October 2002.  Empirical results suggest that the farm-retail price transmission process for milk is asymmetric.  Price transmission elasticities in conjunction with rising farm prices...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19316

Mata Matters: Macros
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. In the Mata Matters column, we show how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. Macros are the subject of this column.
Tipo: Article
Palavras-chave: Mata; Macros; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122602

TO DUAL OR NOT TO DUAL?
Provedor de dados: 31
Autores: Pope,   Rulon D.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32263

RURAL HOUSEHOLD DATA COLLECTION IN DEVELOPING COUNTRIES: DESIGNING INSTRUMENTS AND METHODS FOR COLLECTING FARM PRODUCTION DATA
Provedor de dados: 31
Autores: Rozelle,   Scott.
This paper aids researchers who are conducting microeconomic work in developing countries to more effectively collect farm production data. The discussion focuses on helping the researcher who has fairly well-defined research ideas to better visualize the steps that are necessary for collecting farm production data by raising conceptual and organizational issues that will be faced during the collection process. A wide range of data collection strategies is reviewed for both data-intensive studies that concentrate on production and technological issues, as well as less intensive studies that are only interested in measuring the contribution of farming activities to overall household income. Both survey-based and recordkeeping methodologies are discussed and...
Tipo: Working or Discussion Paper
Palavras-chave: Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/7267

The Blinder–Oaxaca decomposition for linear regression models
Provedor de dados: 31
Autores: Jann,   Ben.
The counterfactual decomposition technique popularized by Blinder (1973, Journal of Human Resources, 436–455) and Oaxaca (1973, International Economic Review, 693–709) is widely used to study mean outcome differences between groups. For example, the technique is often used to analyze wage gaps by sex or race. This article summarizes the technique and addresses several complications, such as the identification of effects of categorical predictors in the detailed decomposition or the estimation of standard errors. A new command called oaxaca is introduced, and examples illustrating its usage are given.
Tipo: Article
Palavras-chave: Oaxaca; Blinder–Oaxaca decomposition; Outcome differential; Wage gap; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122615

Comparative Analysis of Rural Consumption Expenditure in China
Provedor de dados: 31
Autores: Zhang,   Jie; Xie,   Jiaquan; Zhou,   Wuyang.
The disparity of consumption expenditure among rural areas in China was studied. Then income and living expenditure of rural residents were divided into 5 grades. Principle and method of Cluster Analysis were introduced. Next, Cluster Analysis was adopted to research the disparity of rural consumption expenditure among various areas. Results showed that income and consumption expenditure of 31 districts, cities and provinces could be divided into 5 classes. Shanghai City was the only city rated as the first-class areas with highest income and consumption. 7 cities and provinces were rated as the top three classes of areas. Taking Hebei and Jilin Province as the representatives, most parts of the fourth-class areas were located in northeast part of China...
Tipo: Thesis or Dissertation
Palavras-chave: Consumption expenditure; Engel coefficient; Cluster Analysis; China; Community/Rural/Urban Development; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53754

SHADOW PRICE OF ENVIRONMENTAL BADS: WEAK VS. STRONG DISPOSABILITY
Provedor de dados: 31
Autores: Shaik,   Saleem; Helmers,   Glenn A.
This paper addresses the issue of the shadow price of environmental bads treated as an undesirable output (normal input) with weak (strong) disposability in a two-stage estimation. Nebraska agriculture sector time series data used is spread over 1936-94.  Results indicate the difference in the price due to the disposability property.
Tipo: Conference Paper or Presentation
Palavras-chave: Shadow prices; Weak; Strong Disposability; Environmental Bads; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21615

How appropriate are myopic optimization models to predict decision behaviour: A comparison between agent-based models and business management games
Provedor de dados: 31
Autores: Appel,   Franziska; Musshoff,   Oliver.
Agent-based models (ABM) are used in many cases of policy assessment in agriculture. But the behavioural assumptions of these models consider farmers as myopic optimizing profit maximizers. In this contribution we compare the behaviour of myopic computer agents with the behaviour of students playing a multi period business management game. We aim to answer the question, how far are agent-based models valid to map “real” human behaviour, so that ABM can be used well for policy impact assessment.
Tipo: Conference Paper or Presentation
Palavras-chave: Agent-based models; Business management games; Policy impact analysis; Research Methods/ Statistical Methods; C63; C93; D22; Q18.
Ano: 2011
URL: http://purl.umn.edu/115994

Optimal Coverage Level Choice with Individual and Area Plans of Insurance
Provedor de dados: 31
Autores: Bulut,   Harun; Collins,   Keith J.; Zacharias,   Thomas P.
We theoretically examine a farmer’s coverage demand with area and individual insurance plans as either separate or integrated options. The individual and area losses are assumed to be imperfectly and positively correlated. With actuarially fair rates, the farmer will fully insure with the individual plan and demand no area insurance regardless of the plans being separate or integrated. Under separate plans, free area insurance and the fair rate for individual insurance, area insurance replaces a portion of individual insurance demand. Under integrated plans, free area insurance, and the fair rate for individual insurance, the farmer will over-insure with individual plan and demand additional area insurance.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural risk; Area plans of insurance; Crop insurance; Agricultural and Food Policy; Agricultural Finance; Crop Production/Industries; Demand and Price Analysis; Farm Management; Financial Economics; Industrial Organization; Marketing; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty; D81; G22; Q12; Q18.
Ano: 2011
URL: http://purl.umn.edu/103185

Financial Feasibility of Simultaneous Production of Pine Sawlogs, Forage, and Meat Goats on Small Farms in Alabama: A Preliminary Analysis
Provedor de dados: 31
Autores: Broughton,   Brandi; Bukenya,   James O.
Small and limited resource farmers and landowners in the Alabama Black Belt region face many challenges as they seek to make their farms and forestlands profitable, productive and environmentally sustainable. A host of problems—farmland conversion, urbanization pressures, reductions in water quality and availability, soil erosion, irregular cash flows, and increased government regulation—make managing family farms or forestland a difficult task. In response to these challenges, many farmers and landowners are considering agroforestry as an opportunity to increase land productivity and to improve their cash flows by combining income from agriculture, forestry, and animal production on the same piece of land. The objective in this paper was to conduct...
Tipo: Conference Paper or Presentation
Palavras-chave: Silvopasture; Financial Analysis; Enterprise Budgets; Cash Flow Analysis; Agribusiness; Community/Rural/Urban Development; Livestock Production/Industries; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/56485

Review of Event History Analysis with Stata by Blossfeld, Golsch, and Rohwer
Provedor de dados: 31
Autores: Kalter,   Frank.
This article reviews Event History Analysis with Stata by Blossfeld, Golsch, and Rohwer.
Tipo: Article
Palavras-chave: Causal modeling; Event history analysis; TDA; Teaching; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120935

Economics of Fish Marketing in Central Uganda: A Preliminary Analysis
Provedor de dados: 31
Autores: Bukenya,   James O.; Hyuha,   Theodora; Twinamasiko,   Julius; Molnar,   Joseph J.
The paper examines profitability and market performance of small-scale fish traders selected randomly from a cross-section of nine fish markets in four districts in Central Uganda. Data were collected through a structured questionnaire which was designed to solicit information on traders’ socio-economic characteristics, marketing characteristics, operating costs and returns, and problems associated with fish marketing in the study area. Percentages were used to describe the socio-economic characteristics, market characteristic and problems associated with fish marketing while gross profit and marketing performance models were used to determine profitability, marketing margin and operational efficiency, respectively. The results suggest that fish trade is...
Tipo: Presentation
Palavras-chave: Fish marketing; Survey data; Gross profit; Market margin; Operational efficiency; Uganda; Agribusiness; International Development; International Relations/Trade; Marketing; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/119527

Small Business Marketing Capability in the Food Sector: The Cases of Belgium, Hungary and Italy
Provedor de dados: 31
Autores: Banterle,   Alessandro; Carraresi,   Laura; Stranieri,   Stefanella.
The purpose of this paper is to assess the marketing management capabilities of SMEs producing traditional food products in EU through the development of a self‐evaluation tool. SMEs represent the greater part of European food firms and they find it very difficult to adapt to market changes, and to compete with big enterprises. In this context, marketing management capabilities play a key role in good SME performance in the market. The self-evaluation tool is developed in the innovative form of an interactive questionnaire published on the web. At the moment, the sample is composed by 60 traditional food producers located in three member states (Belgium, Italy, and Hungary) belonging to different sectors (cheese, beer, dry ham, sausage and white pepper)....
Tipo: Journal Article
Palavras-chave: Marketing capabilities; Traditional food; SMEs; Cluster analysis; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/97226

Behavioral Salinity Response: Estimating Salinity Policies from Remote Sensed Micro-Data
Provedor de dados: 31
Autores: MacEwan,   Duncan; Howitt,   Richard E.
In arid regions, including Australia's Murray-Darling basin and California's Central Valley, increasing salinity is a problem affecting agriculture, regional economies, urban areas, and the environment. The direct costs of salinity to agriculture in the Murray-Darling basin and California’s Central Valley are on the order of $500 million per year. Policymakers want to design policies to effectively manage salinity and, as such, need to understand how farmers respond to changing salinity levels. Reduced crop yields account for the largest direct cost of salinity to agriculture however farmers are able to mitigate effects through field management. Consequently, there is a difference between experimentally estimated yield-salinity functions and those which...
Tipo: Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/124331

The Ten Relationships in Rural Land Circulation
Provedor de dados: 31
Autores: Cai,   Zhirong; Ren,   Shuo; Zhang,   Zhigang.
The ten relationships during land circulation are discussed. Among them, the relationship between peasant household and government indicates that government should only carry out its service and regulatory functions and farmers should be the main body of land circulation, because peasants usually have no discourse power during land circulation. In the relationship between land ownership and contracting management right, we mainly discuss the transfer of land contracting management right and point out that land contracting management right within a certain period is the object of land circulation. In the relationship between land circulation and deepening reform, land circulation is only an approach to develop scale management and to deepen the reform. Land...
Tipo: Thesis or Dissertation
Palavras-chave: Land circulation; Permanent contract of land; Institutional transition; China; Demand and Price Analysis; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/58483

Explained variation for survival models
Provedor de dados: 31
Autores: Royston,   Patrick.
This article introduces a new measure of explained variation for use with censored survival data. It is a modified version of a measure previously described by John O’Quigley and colleagues, itself a modification of Nagelkerke’s earlier proposal for a general index of determination. I describe Stata programs str2ph, which implements the new measure, and str2d, which implements a measure proposed in 2004 by Royston and Sauerbrei. I provide examples with real data.
Tipo: Journal Article
Palavras-chave: Censored survival data; Regression models; Index of determination; Explained variation; Explained randomness; Information gain; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117558

Short Chain in FVG Region: An Evaluation of the Customer Satisfaction at the  “Farmer’s Shopping Points”
Provedor de dados: 31
Autores: Rosa,   Franco.
Farmer market, farmer shops, milk dispenser, 0‐Km are some of the new born initiatives for trading agricultural products at (or near) the farm gate, now spreading in EU‐USA; their purpose is to offer to the farmers the chance to trade directly their products, and offer to the consumers new shopping opportunities alternatives to conventional food marketing outlets. This study was addressed to test the customer satisfaction at the farmers’ shops created by a farmer cooperative. The experiment was performed in Friuli VG a North‐East region of Italy, with a survey using a questionnaire submitted to a number of customers randomly selected at the end of their shopping. The customer satisfaction (CS) was evaluated with the SERQUAL procedure consisting in...
Tipo: Conference Paper or Presentation
Palavras-chave: Farmer markets; Short chain; Direct selling; Customer satisfaction; Shopping point; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100459

A Preliminary Analysis of the Benefits of Introducing Apomixis into Rice
Provedor de dados: 31
Autores: Frisvold,   George B.; Bicknell,   Kathryn; Bicknell,   Ross.
The objective of this research is to undertake an ex ante economic analysis of basic scientific research that aims to identify the gene(s) that control apomictic reproduction, with the ultimate aim of transferring the characteristic into commercially important crops. This paper reports very preliminary results, using the introduction of apomixis into rice as a case study. Apomixis is a natural, asexual method of plant reproduction resulting in offspring that are genetically identical to the mother plant. Apomixis promises to revolutionize plant breeding by providing a system for crop improvement that allows any desired variety, including hybrids, to breed true. This ability will make both breeding and seed production more efficient. It offers the...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Institutional and Behavioral Economics; Land Economics/Use; Production Economics; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/98515

RELATIVE SENSITIVITY OF SELECTED DISTRIBUTED LAG ESTIMATORS TO MEASUREMENT AND SPECIFICATION ERROR
Provedor de dados: 31
Autores: Bauer,   Larry L.; Mundy,   S. Darrell; Sappington,   Charles B.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/30489

A NEW ALGORITHM FOR COMPUTING COMPENSATED INCOME FROM ORDINARY DEMAND FUNCTIONS
Provedor de dados: 31
Autores: Dumagan,   Jesus C.; Mount,   Timothy D.
This paper proposes a REversible Second-ORder Taylor (RESORT) expansion of the expenditure function to compute compensated income from ordinary demand functions as an alternative to the algorithm proposed by Vartia. These algorithms provide measures of Hicksian welfare changes and Konus-type cost of living indices. RESORT also validates the results by checking the matrix of compensated price effects. obtained through the Slutsky equation, for symmetry and negative semi-definiteness as required by expenditure minimization. In contrast, Vartia's algorithm provides no validation procedure. RESORT is similar to Vartia's algorithm in using price steps. It computes compensated income at each step "forward" from the initial to the terminal prices, and insures...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/6855

PRICE FOUNDED TESTS FOR MARKET INTEGRATION: FISH MARKETS IN FRANCE
Provedor de dados: 31
Autores: Asche,   Frank; Gordon,   Daniel V.; Hannesson,   Rognvaldur.
This paper discuss the relationship between traditional parametric tests for market integration such as causuality tests and tests of the Law of One Price and cointegration tests for market integration. We show that cointegration tests are a natural extension of the traditional methods taking into account that prices are nonstationary, and not an alternative approach. By using the Johansen test, one can both test for causality and provided that prices are cointegrated, for the Law of One Price. An empirical analysis is provided for the whitefish market in France.
Tipo: Conference Paper or Presentation
Palavras-chave: Industrial Organization; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20904

FOREWORD: The Economics of Land Use Change: Advancing the Frontiers
Provedor de dados: 31
Autores: Lynch,   Lori; Geoghegan,   Jacqueline.
Tipo: Article
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/120679

Estimating Farm Efficiency in the Presence of Double Heteroscedasticity Using Panel Data
Provedor de dados: 31
Autores: Hadri,   Kaddour; Guermat,   Cherif; Whittaker,   Julie.
The accuracy of technical efficiency measures is important given the interest in such measures in policy discussions. In recent years the use of stochastic frontiers has become popular for estimating technical inefficiency, but estimated inefficiencies are sensitive to specification errors. One source of such errors is heteroscedasticity. This paper addresses this issue by extending the Hadri (1999) correction for heteroscedasticity to stochastic production frontiers and to panel data. It is argued that heteroscedasticity within an estimation can have a significant effect on results, and that correcting for heteroscedasticity yields more accurate measures of technical inefficiency. Using panel data on cereal farms, it is found that the usual technical...
Tipo: Journal Article
Palavras-chave: Stochastic frontier production; Heteroscedasticity; Technical efficiency; Panel data; Farm Management; Research Methods/ Statistical Methods; C23; C24; D24; Q12.
Ano: 2003
URL: http://purl.umn.edu/43994

Solvency and Performance of French Wineries in Times of Declining Sales: Co‐operatives and Corporations
Provedor de dados: 31
Autores: Declerck,   Francis; Viviani,   Jean-Laurent.
The paper assesses the ability of French wineries to prevail over the crisis of French wine in the years 2000. Corporations are distinguished from co‐operatives: Over the 2000‐2006 period in spite of sales fluctuations, French wineries did not increase their financial debt level substantially. Such result supports the traditional static trade‐off theory (TOT). Co‐operatives were able to absorb part of the impact of the wine crisis at the expense of their members, in increasing account payables to member. Corporations have not increased trade account payables to vine growers. In the mid‐2000s, the French wine crisis has not been strong enough to shake the financial structure of cooperatives and corporations. But co‐operatives look more affected. However,...
Tipo: Conference Paper or Presentation
Palavras-chave: Winery; Co‐operative; Strategy; Debt; Leverage; Performance; Wine; Crisis; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100507

A Numerical Stochastic Control model of Range Management
Provedor de dados: 31
Autores: Beard,   Rodney.
An optimal stochastic control model of grazing that incorporates both pasture and livestock dynamics is presented. The model is solved numerically using Markov chain approximation methods. Markov chain approximation methods have a number of advantages as a means of solving stochastic optimal control methods compared with the usual alternatives. In particular, optimal control of the approximating Markov chain may be determined using Linear programming methods, thus making optimal stochastic control methods accessible to a wider audience.
Tipo: Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/123604

Principles of Institutionalist Research Methodology
Provedor de dados: 31
Autores: Cohen,   Mark.
Tipo: Working Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/121477

A SPATIAL MODEL OF ANIMAL DISEASE CONTROL IN LIVESTOCK: EMPIRICAL ANALYSIS OF FOOT AND MOUTH DISEASE IN THE SOUTHERN CONE
Provedor de dados: 31
Autores: Rich,   Karl M.; Winter-Nelson,   Alex.
This paper presents a multi-market model of animal disease control that extends the current literature by accounting for spatial and inter-temporal relations in both epidemiological and economic variables. The model is applied to Foot and Mouth Disease control in Argentina, Uruguay and Paraguay, but it is broadly generalizable.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20015

Greenhouse Gas Emission Factor Module: Land Use in Rural New Zealand—Climate Version 1
Provedor de dados: 31
Autores: Hendy,   Joanna; Kerr,   Suzi.
Several different New Zealand economic models produce measures of rural economic activity that have greenhouse gas implications. For climate change analysis, models need to translate economic activity into greenhouse gas emissions. This document estimates functions and creates projections for land-use related greenhouse gas emissions per unit of economic activity that are simple; are based on readily available data and strong science; are consistent with the national inventory in 2002; evolve so that implied net emissions approximately match past inventory totals (1990–2002); and can be linked easily to a variety of models so they can be used in simulations. We estimate dynamic greenhouse gas emission functions for five land uses: dairy, sheep, beef,...
Tipo: Conference Paper or Presentation
Palavras-chave: Climate change; Greenhouse gases; Methane; Nitrous oxide; Carbon dioxide; Scrub; Forest; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; International Relations/Trade; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98501

Do Supervisors Affect the Valuation of Public Goods?
Provedor de dados: 31
Autores: Franceschi,   Dina; Vásquez,   William F.
Systematic supervision procedures have been proposed to improve contingent valuation surveying, particularly in developing countries. Surprisingly, the CV literature does not say much about the potential effects of supervision even though there is evidence of interviewer effects and social desirability issues that can bias results. This paper investigates the effects of interview supervision on the valuation of public services, using split-sample treatments to include a test of scope of a nested good and to assess the effect of interview supervision on reported WTP. Results suggest that supervisors can be used to improve quality with no effect on WTP estimates.
Tipo: Journal Article
Palavras-chave: Contingent valuation; Drinking water; Nicaragua; Social desirability; Supervision effects; Willingness to pay; Community/Rural/Urban Development; Consumer/Household Economics; Environmental Economics and Policy; Public Economics; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/117771

Sensitivity analysis for average treatment effects
Provedor de dados: 31
Autores: Becker,   Sascha O.; Caliendo,   Marco.
Based on the conditional independence or unconfoundedness assumption, matching has become a popular approach to estimate average treatment effects. Checking the sensitivity of the estimated results with respect to deviations from this identifying assumption has become an increasingly important topic in the applied evaluation literature. If there are unobserved variables that affect assignment into treatment and the outcome variable simultaneously, a hidden bias might arise to which matching estimators are not robust. We address this problem with the bounding approach proposed by Rosenbaum (Observational Studies, 2nd ed., New York: Springer), where mhbounds lets the researcher determine how strongly an unmeasured variable must influence the selection...
Tipo: Article
Palavras-chave: Mhbounds; Matching; Treatment effects; Sensitivity analysis; Unobserved heterogeneity; Rosenbaum bounds; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119255

A Game Theoretic Framework for Cooperative Benefits in South Africa’s Land Redistribution Process: A Case of Northern Kwa-Zulu Natal Sugarcane Farmland Transfers
Provedor de dados: 31
Autores: Mbatha,    C. Nhlanhla; Antrobus,   G.G.
A good indicator of successful farm redistribution cases has to be the continuation of viable productivity rates in their post transfer periods. Continued productivity benefits all the stakeholders that are involved in the process. Unfortunately negative productivity levels have been reported in numerous South African land redistribution transfers in recent years. A game theoretic perspective is adopted to argue that cooperation among key stakeholders, which could be enforced through long term contracts between a land buyer, sellers and new owners, would lead to higher productivity levels and other benefits. Additional benefits would, for example, include market related prices paid by a buyer. Sugarcane farm transfer cases from two municipality districts...
Tipo: Journal Article
Palavras-chave: Sugarcane; Farms; Redistribution; Productivity; Cooperation; Games; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/96156

NONSTRUCTURAL AND STATISTICAL NONPARAMETRIC MARKET POWER TESTS: AN EMPIRICAL INVESTIGATION
Provedor de dados: 31
Autores: Noelke,   Corinna M.; Raper,   Kellie Curry.
We use Monte Carlo experiments to assess the accuracy of two nonstructural and two statistical nonparametric market power tests.  We implement these monopoly and monopsony market power tests using data from ten known market structures.  The objective is to determine which test is most able to distinguish between market structures.  The statistical nonparametric market power tests appear to be promising.
Tipo: Conference Paper or Presentation
Palavras-chave: Market power; Monte Carlo; Nonparametric; Nonstructural; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21645

An Appreciation of Decision Analysis in Management
Provedor de dados: 31
Autores: Anderson,   Jock R.; Hardaker,   J. Brian.
Decision analysis, the practice of Bernoullian decision theory and Bayesian statistics, is reviewed in relation to its application in management. Aspects of the scaling of beliefs (probabilities) and preferences (utilities) are discussed, focussing on practical problems. It is concluded that the solution of these difficulties may best be sought through more widespread analysis of real-world decisions.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1972
URL: http://purl.umn.edu/9649

Food Chain Actors’ Perceptions of and Adaptations to Volatile Markets: Results of a Media Analysis
Provedor de dados: 31
Autores: von Davier,   Zazie; Heyder,   Matthias; Theuvsen,   Ludwig.
The volatility of agricultural markets has increased remarkably in recent years. In spite of this, the way in which supply chain actors perceive market volatility has only rarely been analyzed. This paper seeks to close this research gap by presenting empirical findings about how the volatility of agricultural markets is perceived, how increasing market volatilities are being explained, and what adaptations to the volatile external environments are being suggested. Based on a large‐scale media analysis, we have identified perceptions, which vary greatly over time, especially with regard to the perception of the threats and opportunities volatility creates for farms and firms and the most frequently identified reasons for volatile prices.
Tipo: Conference Paper or Presentation
Palavras-chave: Agriculture; Media analysis; Public discourse; Shared assumptions; Volatility; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100472

WORLD BANK PROJECT APPRAISAL AND AN EMERGENT DEVELOPMENT PERSPECTIVE:  THE ITERATIVE/PARTICIPATORY APPROACH
Provedor de dados: 31
Autores: Zewde,   Almaz.
This study aimed to investigate the strategic assumptions and practices in World Bank project appraisal programs. Semistructured interviews of senior World Bank field officers in Addis Ababa and Nirobi and extensive review of World Bank appraisal directives and related documents provided the data for the study. The purpose was to see the correspondence between Bank project appraisal methods, assumptions, and criteria and the iterative/participatory development model.   The findings suggest that despite the Bank's awareness of the inherent value of the iterative/participatory development model and expressed interest in changing the direction of the Bank's development practices towards it, the project approach with appraisal emphasis on monetary and...
Tipo: Thesis or Dissertation
Palavras-chave: International Development; Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/10975

Predicting one Shot Play in 2x2 Games Using Beliefs Based on Minimax Regret
Provedor de dados: 31
Autores: Gallice,   Andrea.
We present a simple procedure that selects the strategies most likely to be played by inexperienced agents who interact in one shot 2x2 matching pennies games. As a first step we axiomatically describe players’ beliefs. We find the minimax regret criterion to be the simplest functional form that satisfies all the axioms. Then we hypothesize players act as if they were best responding to the belief their opponent plays accordino to minimax regret. When compared with existing experimental evidences about one shot matching pennies games, the procedure correctly indicates the choices of around 80% of the players. Applications to other classes of games are also explored.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/12182

Forum - On the Futility of Utility; Comment on Trebeck
Provedor de dados: 31
Autores: Trebeck,   David B.; Dillon,   John L.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1971
URL: http://purl.umn.edu/9640

Agentenbasierte Modellierung von Landnutzungsdynamiken und Politikoptionen
Provedor de dados: 31
Autores: Berger,   Thomas.
Agent-based modeling offers the technical opportunity to spatially integrate biophysical and socio-economic model components, thereby capturing the interactions between agricultural and environmental policy measures, land use decisions and ecological processes. Development paths in the use of resources can be calculated with the help of computer stimulations which determine the range of possible farm adjustments and policy interventions. Through coupling with global modeling systems, scenario analyses can be run to investigate the impacts of global change on land and water resources at regional and local level. This article gives an overview of agent-based modeling applied to the study of land use dynamics and policy options. It outlines an agricultural...
Tipo: Journal Article
Palavras-chave: Multi-agent systems; Integrated modeling; Land and water resources; Decision support; Agricultural and environmental policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/97430

EVALUATING ALTERNATIVE METHODS OF DEALING WITH MISSING OBSERVATIONS - AN ECONOMIC APPLICATION
Provedor de dados: 31
Autores: Onozaka,   Yuko.
This paper compares methods to remedy missing value problems in survey data.  The commonly used methods to deal with this issue are to delete observations that have missing values (case-deletion), replace missing values with sample mean (mean imputation), and substitute a fitted value from auxiliary regression (regression imputation).  These methods are easy to implement but have potentially serious drawbacks such as bias and inefficiency.  In addition, these methods treat imputed values as known so that they ignore the uncertainty due to ‘'missingness'’, which can result in underestimating the standard errors.  An alternative method is Multiple Imputation (MI).  In this paper, Expectation Maximization (EM) and Data Augmentation (DA) are used to create...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19875

Impact of expectation formation on dynamic investment decisions: an application to U.S. agriculture
Provedor de dados: 31
Autores: Karp,   Larry S.; Fawson,   Christopher B.; Shumway,   C. Richard.
Tipo: Working or Discussion Paper
Palavras-chave: Financial Economics; Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/6120

AN EXPERIMENT IN CONTINGENT VALUATION AND SOCIAL DESIRABILITY
Provedor de dados: 31
Autores: Laughland,   Andrew S.; Musser,   Wesley N.; Musser,   Lynn M.
Social desirability (SD) represents the problem of subjects responding with social norms rather than individual values.  This paper briefly surveys the SD literature and considers its relevance for contingent valuation (CV) studies.  In an empirical study, undergraduate students were administered the Marlowe-Crowne Social Desirability Scale, as well as CV questions.  High SD scores were hypothesized to imply a greater likelihood of offering a protest reason for a zero bid and to increase bids for socially desirable commodities.  While all hypotheses were not supported, the empirical results suggest that SD can influence CV responses and should not be dismissed prematurely.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/31323

Is Wine a Financial Parachute?
Provedor de dados: 31
Autores: Baldi,   Lucia; Vandone,   Daniela; Peri,   Massimo.
This paper analyzes the relationship between Global Wine Industry Share Price Indexes and composite stock market indexes using a Threshold Vector Error Correction Model (TVECM), aiming to investigate if investments in the wine sector play a role in determining financial risk and return to investors who include it in their portfolio. Whilst in most of the literature analyses the return of investments of fine wine, this paper places the focus to “normal” (i.e. non‐fine) wine, using data from the Mediobanca database covering companies in the wine industry listed on regulated stock market in France, US, Australia, Chile and China . The dataset cover the time period going from January 1, 2001, to the end of February 2009. The estimates of the TVECM lead to the...
Tipo: Conference Paper or Presentation
Palavras-chave: Wine sector; Stock Market; Threshold Cointegration; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods; Q11; G14; C32.
Ano: 2010
URL: http://purl.umn.edu/100506

World Wheat Policy Simulation Model: Preliminary Baseline
Provedor de dados: 31
Autores: Benirschka,   Martin; Koo,   Won W.
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/23184

Stata tip 34: Tabulation by listing
Provedor de dados: 31
Autores: Harrison,   David A.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117592

Neoclassical consumer theory and genetically modified food
Provedor de dados: 31
Autores: Kaye-Blake,   William.
Three axioms underpin consumer choice in neoclassical theory: weak order, independence, and continuity. Two of these axioms may not hold, however, for consumers’ choices regarding genetically modified (GM) food. Consumers may evaluate product attributes differently depending on whether the food is GM or not, violating attribute independence. Some consumers may not want GM food at all, violating continuity. The axioms were empirically investigated with a choice experiment survey. The paper discusses evidence of violations of both independence and continuity, as well as a non-neoclassical approach to modelling consumer choice.
Tipo: Conference Paper or Presentation
Palavras-chave: Genetically modified food; Neoclassical; Bounded rationality; Choice modelling; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/98511

Market Structure Conduct Performance (SCP) Hypothesis Revisited using Stochastic Frontier Efficiency Analysis
Provedor de dados: 31
Autores: Edwards,   Seanicaa; Allen,   Albert J.; Shaik,   Saleem.
Use of efficiency measures as a proxy for performance to test the market structure-conduct-performance (SCP) hypothesis is explored.  Utilizing Battese and Coelli specification, we estimate stochastic frontier production function and SCP equations with output and efficiency measures as endogenous variables.  An empirical application to U.S. trucking carries over the period 1994-2003 with emphasis on the agricultural commodity and refrigerated food products carriers is examined.  Results reveal that the variables average haul, average load and market concentration significantly affected the efficiency of firms with 2-8 number of years within each firm.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21350

Recent Developments in Applying Duality Theory
Provedor de dados: 31
Autores: Lawrence,   Denis.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/12269

ICT industry and resources based analysis of maintenance SME in the Central Europe
Provedor de dados: 31
Autores: Tesar,   Stepan; Havlicek,   Zdenek; Ocenasek,   Vladimir.
Highly competitive situation in Information and Communication technology (ICT) maintenance industry requires a precise analysis of all important factors and carefully defined company strategy which addresses each of these aspects. This paper presents a resource based analysis of family run SME, operating in IT parts and consumables market. In order to understand this complex view, it first describes the company background. It briefly presents the industry key success factors and company strategy of the SME. The value chain analysis helps to name the main organization’s capabilities and evaluates them in terms of costs and customer willingness to pay. Resource audit provides an analysis of key company tangible, intangible and human resources. The outcome of...
Tipo: Journal Article
Palavras-chave: ICT; Resource based analysis; Resources; Capabilities; Strategy; SME; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; GA; IN.
Ano: 2010
URL: http://purl.umn.edu/99228

MATRIX GENERATOR AND OPTIONALS (MGAO): USERS GUIDE
Provedor de dados: 31
Autores: McDowell,   Howard.
Matrix Generator and Optionals (MGAO) is a computer software package developed by Paul Ching and Terry L. Roe. The program is designed to generate input data for a linear programming problem approximating a non-linear programming problem, submit the generated problem to an optimization package, from which the user receives standard computer output.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/13577

A NOTE ON SPURIOUS REGRESSION IN PANELS WITH CROSS-SECTION DEPENDENCE
Provedor de dados: 31
Autores: Su,   Jen-Je.
This paper analyses regression of two independent stationary panels with cross-sectional dependence.  It is shown that the pooling least squares (PLS) estimator converges to zero in probability while the individual OLS estimator converges to a random variable.  However, the PLS-based and the OLS-based t-statistics diverge, so the null hypothesis of no correlation tends to be spuriously rejected.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/23712

Optimal Coverage Level Choice with Individual and Area Plans of Insurance
Provedor de dados: 31
Autores: Bulut,   Harun; Collins,   Keith J.; Zacharias,   Thomas P.
We theoretically examine a farmer’s coverage demand with area and individual insurance plans as either separate or integrated options. The individual and area losses are assumed to be imperfectly and positively correlated. With actuarially fair rates, the farmer will fully insure with the individual plan and demand no area insurance regardless of the plans being separate or integrated. Under separate plans, free area insurance and the fair rate for individual insurance, area insurance replaces a portion of individual insurance demand. Under integrated plans, free area insurance, and the fair rate for individual insurance, the farmer over-insures using both area and individual plans.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural risk; Area plans of insurance; Crop insurance; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Crop Production/Industries; Demand and Price Analysis; Farm Management; Research Methods/ Statistical Methods; Risk and Uncertainty; D81; G22; Q12; Q18.
Ano: 2011
URL: http://purl.umn.edu/98803

Further Evidence of Price Transmission and Asymmetric  Adjustment in the U.S. Beef and Pork Sectors
Provedor de dados: 31
Autores: Boetel,   Brenda L.; Liu,   Donald J.
This paper expands the contributions of Goodwin and Holt (AJAE, 1999) and Goodwin and Harper (J. of Ag. and Appl. Econ., 2000), GHH henceforth, who analyze retail-wholesale-farm price transmissions in the U.S. beef and pork industries using weekly data.  First, in light of advancements in unit root tests, we re-examine in a more comprehensive manner GHH’s conclusion that the weekly U.S. cattle/beef and hog/pork price series are nonstationary.  The conventional augmented Dickey-Fuller test that GHH adopt has low power in discriminating against the unit root null because it does not entertain the possibility of a structure break in the deterministic trend function.  Second, we examine more closely the estimation procedure surrounding the long run price...
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6169

THE ALMOST IDEAL SUPPLY SYSTEM AND AGRICULTURAL PRODUCTION IN THE UNITED STATES
Provedor de dados: 31
Autores: Hilmer,   Christiana E.; Holt,   Matthew T.
This paper estimates an Almost Ideal Supply System using aggregate U.S. agricultural data.  Share equations derived from an indirect production function yield elasticities that are consistent with production theory.  A nested test comparing the Almost Ideal Supply System to the Translog Production Function finds little difference between the two models.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21659

A Monte Carlo Sampling Approach to Testing Separate Families of  Hypotheses: Monte Carlo Results
Provedor de dados: 31
Autores: Coulibaly,   Nouhoun; Brorsen,   B. Wade.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/35879

Product Life Cycles and Innovation in the US Seed Corn Industry
Provedor de dados: 31
Autores: Magnier,   Alexandre; Kalaitzandonakes,   Nicholas G.; Miller,   Douglas J.
The purpose of this study is to evaluate potential changes in the length of product life cycles in the US seed corn industry. We use the observed survival time on the market for hybrids sold during 1997-2009 to conduct a survival analysis. Our empirical results show that the expected lifetimes for corn hybrids with single biotech traits are 5-15% longer than for hybrids with multiple (stacked) traits, and the expected lifetimes for conventional corn are 13-17% longer than stacked hybrids. Also, the product life cycles for all types of hybrids have decreased over the past twelve years (especially after 2004), but the rate of decline is roughly similar across hybrid types. Based on this evidence, we conclude that the shorter product life cycles are closely...
Tipo: Journal Article
Palavras-chave: Accelerated failure time; Biotechnology; Product life cycle; Survival analysis; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/93557

Maintaining Parameter Invariance in Censored Micro-Level Data
Provedor de dados: 31
Autores: Preckel,   Paul V.; Eales,   James S.; Lillywhite,   Jay M.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19108

AN ECONOMETRIC DECOMPOSITION OF AGGREGATE DATA: APPLICATION TO THE EU-15 AVERAGE CATTLE SLAUGHTER WEIGHT
Provedor de dados: 31
Autores: Fabiosa,   Jacinto F.; Premakumar,   V.
Decomposition method was developed to disaggregate EU cattle slaughter weight. Model has good fit, no correlation, significant coefficients, consistent signs, and desirable Theil-validation statistics.  Estimates for calves, cows, and other cattle are very close to reported weights.  Application for New Zealand, Mexico, sheep sector, and dairy-beef calving rates were also successful.
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20830

Ökonometrische Methoden der Politikevaluation: Meilenstein für eine sinnvolle Agrarpolitik der 2. Säule oder akademische Fingerübung?
Provedor de dados: 31
Autores: Henning,   Christian H.C.A.; Michalek,   Jerzy.
Recently the importance of a comprehensive policy evaluation has been increasingly recognized by international organizations, e.g. the World Bank, OECD and FAO as well as especially by the EU. In particular, for agricultural policies of the second pillar a comprehensive evaluation is obligatory. However, presently applied evaluation techniques are clearly lagging behind the ambiguous evaluation targets set by the EU Commission. Given the fact that a comprehensive policy evaluation is a very complex methodological challenge this discrepancy is not really surprising. Thus, nowadays it is still fair to conclude that adequate evaluation tools applicable to EU rural development policies do not exist yet. In this context this paper derives microeconometric...
Tipo: Journal Article
Palavras-chave: Policy evaluation; Propensity score matching; Second pillar of the CAP; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97600

An exact and a Monte Carlo proposal to the Fisher–Pitman permutation tests for paired replicates and for independent samples
Provedor de dados: 31
Autores: Kaiser,   Johannes.
This article concerns the nonparametric Fisher–Pitman tests for paired replicates and independent samples. After outlining the theory of exact tests, I derive Monte Carlo simulations for both of them. Simulations can be useful if one deals with many observations because of the complexity of the algorithms in regard to sample sizes. The tests are designed to be a more powerful alternative to the Wilcoxon signed-rank test and the Wilcoxon–Mann–Whitney rank-sum test if the observations are given on at least an interval scale. The results gained by Monte Carlo versions of the tests are accurate enough in comparison to the exact versions. Finally, I give examples for using both supplemented tests.
Tipo: Article
Palavras-chave: Permtest1; Permtest2; Nonparametric tests; Monte Carlo; Permutation tests; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119284

Economic Impacts of Reduced Delta Exports Resulting from the Wanger Interim Order for Delta Smelt
Provedor de dados: 31
Autores: Sunding,   David L.; Ajami,   Newsha K.; Hatchett,   Steven; Mitchell,   David; Zilberman,   David.
Tipo: Working or Discussion Paper
Palavras-chave: Water transfers; Water supply; Water demand; Water conservation; Water policy; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/51558

From the help desk: Demand system estimation
Provedor de dados: 31
Autores: Poi,   Brian P.
This article provides an example illustrating how to use Stata to estimate systems of household demand equations. More generally, the techniques developed here can be used to estimate any system of nonlinear equations using Stata’s maximum likelihood routines.
Tipo: Journal Article
Palavras-chave: Nonlinear estimation; Maximum likelihood; Demand equations; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116025

Evidence of non-linear price transmission between maize markets in Mexico and the US
Provedor de dados: 31
Autores: Araujo-Enciso,   Sergio Rene.
The present work provides evidence that non linear co-integration between Mexico and the US maize prices exists, at country and regional level. The models suggest that Mexican prices adjust at changes in US prices. Despite asymmetry was statistically rejected, it is likely that it might occur for thriving parameters different that zero in the error correction term. The results suggest on which way the research might be improved in order to assess such co-integration relationship accurately.
Tipo: Conference Paper or Presentation
Palavras-chave: Co-integration; Asymmetric price transmission; Vector error correction model; Error      correction term; Loading parameter; Mexico; US; Maize; Agricultural and Food Policy; Food Security and Poverty; Research Methods/ Statistical Methods; C32; Q11; Q13.
Ano: 2009
URL: http://purl.umn.edu/51366

The Economic Growth Impacts of Sugarcane Expansion In Brazil: An Inter-Regional Analysis
Provedor de dados: 31
Autores: Deuss,   Annelies.
Tipo: Conference Paper or Presentation
Palavras-chave: Brazil; Sugarcane expansion; Economic growth; Propensity score; Ethanol; Agricultural and Food Policy; Crop Production/Industries; International Development; Research Methods/ Statistical Methods; C14; C21; O13; R13.
Ano: 2011
URL: http://purl.umn.edu/103564

The Proportion of the Seasonal Period as a Season Index in Weekly Agricultural Data
Provedor de dados: 31
Autores: Martin-Rodriguez,   Gloria; Caceres-Hernandez,   Jose Juan.
In this paper a seasonal model is proposed to deal with weekly agricultural seasonal patterns in which neither the length of the seasonal period nor the magnitude of the seasonal effects remain the same over time. To model this heterogeneous seasonal behaviour, the seasonal effect at a season is defined as a function of the proportion of the length of the seasonal period elapsed up to this season, and the seasonal pattern is modelled by means of evolving splines. The methodology is illustrated for weekly Canary tomato prices.
Tipo: Conference Paper or Presentation
Palavras-chave: Weekly data; Heterogeneous seasonal patterns; Splines; Demand and Price Analysis; Research Methods/ Statistical Methods; C22; Q17.
Ano: 2009
URL: http://purl.umn.edu/49956

Spatial Shift-Share Analysis of the Leisure and Hospitality Sector on the Gulf Coast following Hurricane Katrina
Provedor de dados: 31
Autores: Evans,   Garen K.
Employment shifts in the Leisure and Hospitality sector along the Gulf coast following Hurricane Katrina were explored using spatial shift-share analysis. Using a spatial weights matrix that incorporated relative employment, and distance measures relative to the track of the storm we calculated classical and spatial shift-share components. Each of the spatial components then was regressed on net employment change, and the results were statistically significant, and similar to results obtained by Marquez and Ramajo (2005). These results suggest that spatial interaction between employment centers as well as with the storm track, was a relevant aspect of the employment shifts that occurred following Hurricane Katrina.
Tipo: Conference Paper or Presentation
Palavras-chave: Labor and Human Capital; Research Methods/ Statistical Methods; R11; R12; J21.
Ano: 2008
URL: http://purl.umn.edu/6744

Development Model of Rural Industrialization in China
Provedor de dados: 31
Autores: Chen,   Weihong; Zhang,   Ruide; Liu,   Guichuan.
With the implementation of the policy of expanding domestic demand, farmers have become the main body of rural economy and rural industrialization. Development of rural industrialization promotes the development of rural economy in China, effectively transfers the surplus labor force in rural areas, continuously optimizes the rural economic structure, improves the living standard of farmers, and has made important contributions to the stability and development of economy and society in China. This paper introduces the connotation of rural industrialization, classifies it into three modes according to the farmer’s investment and economic development, such as exogenous model of rural industrialization, endogenous model of rural industrialization and...
Tipo: Thesis or Dissertation
Palavras-chave: Rural industrialization; Development model; Policy suggestion; China; Community/Rural/Urban Development; Industrial Organization; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/54072

Dynamic Relationships Among Selected U.S. Commodity-Based, Value Added Markets: Applying Directed Acyclic Graphs to a Time Series Model
Provedor de dados: 31
Autores: Babula,   Ronald A.; Bessler,   David A.; Payne,   Warren S.
This paper demonstrates the application of a recently developed methodology, the combination of directed acyclic graphs (DAGs) with Bernanke structural vector autoregression (VAR) models, to model a system of U.S. commodity-related and value-added markets. As an example, the paper applies this methodology to a quarterly system of U.S. markets: the wheat market and a set of downstream milling and bakery markets that use wheat as an input. Analyses of the model's impulse response simulations and forecast error variance decompositions provide updated estimates of market elasticity parameters that drive these markets, and updated policy-relevant information on how these quarterly markets run and dynamically interact. Results suggest that movements in...
Tipo: Working or Discussion Paper
Palavras-chave: Bernanke structural VARs; Directed acyclic graphs; Quarterly wheat-related markets; Industrial Organization; Marketing; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/15879

How robust are indicator based poverty assessment tools over time? Empirical evidence from Central Sulawesi, Indonesia
Provedor de dados: 31
Autores: van Edig,   Xenia; Schwarze,   Stefan; Zeller,   Manfred.
Eradicating poverty is one of the most urgent concerns of development policies. Organisations aiming at reducing poverty need simple and stable tools to detect poor households. Using data from Central Sulawesi, Indonesia, this study aims to test first whether two indicators sets for poverty assessment found in 2005 are still capable in predicting absolute poverty and second, if the indicator composition remains robust over time. Data from two household surveys were used: In 2005 we surveyed 264 households in the vicinity of the Lore Lindu National Park in Central Sulawesi to obtain indicators of poverty and to derive the daily per capita consumption expenditures. In total 280 indicators were sampled. Two different multivariate regression models were fit to...
Tipo: Conference Paper or Presentation
Palavras-chave: Poverty assessment; Poverty indicators; Robustness over time; Indonesia; Food Security and Poverty; Research Methods/ Statistical Methods; I32; R15.
Ano: 2009
URL: http://purl.umn.edu/51674

Speaking Stata: Density probability plots
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Density probability plots show two guesses at the density function of a continuous variable, given a data sample. The first guess is the density function of a specified distribution (e.g., normal, exponential, gamma, etc.) with appropriate parameter values plugged in. The second guess is the same density function evaluated at quantiles corresponding to plotting positions associated with the sample’s order statistics. If the specified distribution fits well, the two guesses will be close. Such plots, suggested by Jones and Daly in 1995, are explained and discussed with examples from simulated and real data. Comparisons are made with histograms, kernel density estimation, and quantile–quantile plots.
Tipo: Journal Article
Palavras-chave: Density probability plots; Distributions; Histograms; Kernel density estimation; Quantile–quantile plots; Statistical graphics; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117517

MS-DOS LINEAR PROGRAMMING BENCHMARKS FOR THE IBM XT, ZENITH 151, IBM AT, AND AT&amp;T 6300
Provedor de dados: 31
Autores: Eldridge,   Charles; Fruin,   Jerry E.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/13416

Empirische Validierung von Realoptionsmodellen
Provedor de dados: 31
Autores: Odening,   Martin; Musshoff,   Oliver; Huettel,   Silke.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/18825

Valuing the Risk of Death and Injury from Landmines in Thailand
Provedor de dados: 31
Autores: Barns,   Sandra A.; Cameron,   Michael P.; Gibson,   John; Lim,   Steven; Marsh,   Dan; Scrimgeour,   Frank G.; Tressler,   John.
This paper presents estimates of the benefits of clearing landmines in rural Thailand using the contingent-valuation (CV) method. The data came from a survey where we asked 341 respondents referendum-type questions that elicit their willingness to pay for landmine clearance. Our estimates imply a value of a statistical life of between US$0.2-0.3 million. The survey also provides estimates of the injury risk-death risk tradeoff and the implicit value of statistical injury. These estimates suggest that the value of lives and injuries saved from mine clearing is likely to be at least an order of magnitude greater than those used in existing studies of mine clearing. Linking a household expenditure survey involving the same sample enables the relationship...
Tipo: Conference Paper or Presentation
Palavras-chave: Benefit-cost analysis; Contingent valuation; Landmines; Value of statistical life; Environmental Economics and Policy; Institutional and Behavioral Economics; International Development; Political Economy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; J17; J28; 022; Q28.
Ano: 2004
URL: http://purl.umn.edu/97797

Environmental Perceptions and Behavioral Change of Hillside Farmers: The Case of Haiti
Provedor de dados: 31
Autores: Bayard,   Budry; Jolly,   Curtis M.
Land degradation is one of the most serious problems facing resource-poor tropical hillside farmers. Studies examining determinants of farmers’ decisions to invest in land improvement technologies have focused on economic and financial factors, neglecting individuals’ perceptions and awareness of the problems and how they affect land use and behavioral change that enhance environmental sustainability. This study examines Haitian peasants’ environmental behavior structure using a structural equation modeling approach. Specifically, the study examines the effects of perceived susceptibility, seriousness, benefits, and barriers to change on attitude, and the causal effect of attitude on behavior. The influence of the level of resources extracted from the land...
Tipo: Journal Article
Palavras-chave: Farmers; Environment; Perception; Behaviour and degradation; Agricultural productivity; Environmental Economics and Policy; Farm Management; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/36804

Stata tip 7: Copying and pasting under Windows
Provedor de dados: 31
Autores: Driver,   Shannon; Royston,   Patrick.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116240

GARCH TIME-SERIES MODELS:  AN APPLICATION TO RETAIL LIVESTOCK PRICES
Provedor de dados: 31
Autores: Aradhyula,   Satheesh V.; Holt,   Matthew T.
This article applies recent developments in time-series modeling to analyze the retail prices of beef, pork, and chicken. Specifically, generalized autoregressive conditional heteroscedasticity (GARCH) models were fitted to these data to determine if, unlike more traditional time-series models, the conditional variances of the underlying stochastic processes are nonconstant. The estimation results indicate that the constant conditional variances assumption can be rejected. Furthermore, ex post forecast intervals generated from the GARCH processes indicate that the forecasting accuracy of the estimated models has varied widely over time with substantial volatility occurring during the 1970s and early 1980s.
Tipo: Journal Article
Palavras-chave: Demand and Price Analysis; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/32111

MODELING COUPON VALUES FOR READY-TO-EAT BREAKFAST CEREALS
Provedor de dados: 31
Autores: Price,   Gregory K.; Connor,   John M.; Fulton,   Joan R.
A theoretical framework is developed to highlight the significant determinants of coupon values.  A fixed effects panel data model is fitted with data from the breakfast cereal industry.  The explanatory variables include own retail price, brand loyalty, brand market share, rival coupon redemptions, and firm and product type indicators.
Tipo: Conference Paper or Presentation
Palavras-chave: Coupons; Ready-to-eat breakfast cereals; Panel data model; Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21553

Governance for Integrated Water Resources Management in a River-Basin Context: Proceedings of a Regional Seminar, Bangkok, May 2002
Provedor de dados: 31
Tipo: Presentation
Palavras-chave: Water resource management; River basins; Governance; Institutional development; Groundwater irrigation; Water policy; Water allocation; Water demand; Irrigation efficiency; Models; Case studies; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2003
URL: http://purl.umn.edu/118402

THE ECONOMIC RECORD VERSUS AER: TWENTY SIX YEARS AHEAD ON THE MONEY-GOODS MODEL
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
We prove that the symmetric and negative semidefinite modified Slutsky matrix derived by Samuelson and Sato (1984) for the money-goods model of the consumer, is identical to that derived by Pearce (1958) a quarter century before and restated sixteen years later by Berglas and Razin (1974).  We also prove that these conditions are only sufficient for the problem at hand and are encompassed by a more general, modified Slutsky matrix that is necessary and sufficient as derived by Paris and Caputo (2001).  These results have crucial relevance for test-ing the implications of consumer behavior.
Tipo: Working or Discussion Paper
Palavras-chave: Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/11949

Markov-Switching Model Selection Using Kullback-Leibler Divergence
Provedor de dados: 31
Autores: Smith,   Aaron D.; Naik,   Prasad A.; Tsai,   Chih-Ling.
In Markov-switching regression models, we use Kullback-Leibler (KL) divergence between the true and candidate models to select the number of states and variables simultaneously. In applying Akaike information criterion (AIC), which is an estimate of KL divergence, we find that AIC retains too many states and variables in the model. Hence, we derive a new information criterion, Markov switching criterion (MSC), which yields a marked improvement in state determination and variable selection because it imposes an appropriate penalty to mitigate the over-retention of states in the Markov chain. MSC performs well in Monte Carlo studies with single and multiple states, small and large samples, and low and high noise. Furthermore, it not only applies to...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/11976

SPATIAL MARKET INTEGRATION IN THE PRESENCE OF THRESHOLD EFFECTS
Provedor de dados: 31
Autores: Goodwin,   Barry K.; Piggott,   Nicholas E.
Threshold cointegration models are used to evaluate spatial price dynamics among regional corn and soybean markets in North Carolina.  Thresholds, reflecting the influences of transactions costs, are confirmed and spatial integration is strongly supported.  Results indicate that equilibrating adjustments to market shocks are generally complete in two weeks.
Tipo: Conference Paper or Presentation
Palavras-chave: Industrial Organization; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21489

THE SINGLE INDEX MARKET MODEL IN AGRICULTURE
Provedor de dados: 31
Autores: Gempesaw,   Conrado M., II; Tambe,   A.M.; Nayga,   Rodolfo M., Jr.; Toensmeyer,   Ulrich C.
This study illustrates the differences in empirical results due to data measurements and estimating procedures when applying the single index market model in agriculture.  Gross and net return betas along with systematic and unsystematic risk proportions are estimated and found to be different.  The stochastic coefficients model is used to show the difference in beta-risk estimates compared with the traditional fixed coefficients OLS procedure.  A third estimating technique, weighted least squares/Prais Winsten method, is also proposed.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/28834

Business Dynamics with Scenarios on Dutch Agriculture and its Institutional Arrangements
Provedor de dados: 31
Autores: Poppe,   Krijn J.
This paper investigates the developments in the Dutch Agri‐Food innovation system. Main components of the system are agriculture and agribusiness, the promotion of interests in the lobby system and the knowledge system. Each has its own dynamics but they are until now tied together by institutional arrangements. Based on a historical description we formulate a simple business dynamics model. The robustness of the system is investigated by a scenario analysis. Results have been checked by interviews with experts.
Tipo: Journal Article
Palavras-chave: Agri‐food innovation system; Business dynamics; Scenario analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/97234

Linking Revealed and Stated Preferences to Test External Validity
Provedor de dados: 31
Autores: Herriges,   Joseph A.; Kling,   Catherine L.; Azevedo,   Christopher D.
A new turn in the research agenda of environmental valuation is under way. Rather than treating stated preference (SP) and revealed preference (RP) as competing valuation techniques, analysts have begun to view them as complementary, where the strengths of each approach can be used to provide more precise and possibly more accurate benefit estimates. In this paper, we reexamine the models and motives for combining revealed and stated preference data. First, we note that because the different kinds of SP data contain different amounts of information, they may indicate different degrees of consistency with RP data. We also reconsider the interpretation of "consistent" or "inconsistent" findings of RP and SP data. We argue that while the conventional approach...
Tipo: Working or Discussion Paper
Palavras-chave: Recreation; Environmental Valuation; Wetlands; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/18602

Extension Educators Collecting Industry-specific Stakeholder Input
Provedor de dados: 31
Autores: Bitsch,   Vera; Ferris,   Ted; Lee,   Katherine L.; McFadden,   Mike; Ross,   Dean.
Extension educators have explored different methods for collecting stakeholder input, but a suitable methodology has not been agreed on.  The Michigan State University Extension dairy team works with an advisory board and also collected formal stakeholder input through ten regional partner group surveys in 1997.  In 2007, the team decided to seek another round of broad-based and inclusive stakeholder input.  The research team decided to employ issue identification groups at different locations throughout the state and a mail survey.  This paper reports on the procedure developed for this purpose and its results.
Tipo: Conference Paper or Presentation
Palavras-chave: Focus group discussion; Formative evaluation; Issue identification; Issue prioritization; Multi-disciplinary teams; Nominal group technique; Agribusiness; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2008
URL: http://purl.umn.edu/43249

Stata tip 35: Detecting whether data have changed
Provedor de dados: 31
Autores: Gould,   William.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117593

USER'S GUIDE TO ORDINARY AND GENERALIZED STOCHASTIC DOMINANCE COMPUTER PROGRAMS
Provedor de dados: 31
Autores: Wilson,   Paul N.; Hwang,   Henry H.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/13277

Logistics demand of agricultural products - A Case of Zhengzhou City of Henan Province
Provedor de dados: 31
Autores: Wang,   Xu-ran; Yao,   Xin-sheng; Wei,   Jian-guang; Fan,   Sha-sha.
We define the category of agricultural products, and introduce the demand standard of population for agricultural products. Furthermore, we adopt the mathematical model to forecast the future population of Zhengzhou City, as well as the demand of agricultural products, the logistics demand and cost of agricultural products in Zhengzhou City in the year 2010.
Tipo: Thesis or Dissertation
Palavras-chave: Agricultural products; Agricultural products logistics; Demand; Forecast; China; Crop Production/Industries; Marketing; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53482

STOCHASTIC EFFICIENCY ANALYSIS USING MULTIPLE UTILITY FUNCTIONS
Provedor de dados: 31
Autores: Schumann,   Keith D.; Richardson,   James W.; Lien,   Gudbrand D.; Hardaker,   J. Brian.
Evaluating the risk of a particular decision depends on the risk aversion of the decision maker related to the underlying utility function.  The objective of this paper is to use stochastic efficiency with respect to a function (SERF) to compare the ranking of risky alternatives using alternative utility functional forms.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19957

A NUMERICAL QUADRATURE APPROACH TO OPTION VALUATION IN WATER MARKETS
Provedor de dados: 31
Autores: Villinski,   Michele T.
The standard Black-Scholes approach to option valuation becomes cumbersome and may fail to yield a solution when applied to non-standard options such as those emerging in water markets.  An alternative tool, numerical quadrature, avoids some restrictive assumptions of the Black-Scholes framework and can more easily price options with complex structures.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21708

Dealing with the tradeoff between water for nature and water for rural livelihoods in the presence of climate uncertainties: lessons for water management
Provedor de dados: 31
Autores: Varela-Ortega,   Consuelo; Blanco-Gutierrez,   Irene; Swartz,   Christopher H.; Downing,   Thomas E.
In arid countries worldwide, social conflicts between irrigation-based human development and the conservation of aquatic ecosystems are widespread and attract many public debates. This research focuses on the analysis of water and agricultural policies aimed to conserve groundwater resources and to maintain rural livelihoods in a basin in Spain’s central arid region. Intensive groundwater mining has caused overexploitation of the basin’s large aquifer and the degradation of internationally reputed wetlands. This has caused notable social conflicts over the years but the  policies implemented have not been able to solve them so far. The methodology consists in the integration of a farm-based economic model and a basin-based hydrology model to analyze the...
Tipo: Conference Paper or Presentation
Palavras-chave: Water policies; Irrigation agriculture; Hydro-economic modeling.; Agricultural and Food Policy; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/51420

Jointly selecting for fibre diameter and fleece weight: A market-level assessment of the QPLU$ Merino breeding project
Provedor de dados: 31
Autores: Mounter,   Stuart W.; Griffith,   Garry R.; Mullen,   John D.
The QPLU$ Merino breeding project began in the early 1990s. The aim of the project was to demonstrate the efficiency of using a selection index to achieve breeding objectives. A number of selection lines were created from three strains of Merino sheep. During the ten-year course of the project, selection of each line was undertaken using an index based on measurements of fleece weight and fibre diameter. Different emphases were placed on each trait in each selected line. This paper estimates the potential aggregate returns of the project to the Australian sheep and wool industries using an equilibrium displacement model.
Tipo: Conference Paper or Presentation
Palavras-chave: Australian sheep and wool industries; Equilibrium displacement model; Cross-commodity relationships; R&amp;D evaluation; Livestock Production/Industries; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6046

The Implications of Skewed Risk Perception for a Dutch Coastal Land Market: Insights from an Agent-Based Computational Economics Model
Provedor de dados: 31
Autores: Filatova,   Tatiana; Parker,   Dawn Cassandra; van der Veen,   Anne.
Dutch coastal land markets are characterized by high amenity values but are threatened by potential coastal hazards, leading to high potential damage costs from flooding. Yet, Dutch residents generally perceive low or no flood risk. Using an agent-based land market model and Dutch survey data on risk perceptions and location preferences, this paper explores the patterns of land development and land rents produced by buyers with low, highly skewed risk perceptions. We find that, compared to representative agent and uniform risk perception models, the skewed risk perception distribution produces substantially more, high-valued development in risky coastal zones, potentially creating economically significant risks triggered by the current Dutch flood...
Tipo: Article
Palavras-chave: Land markets; Risk perceptions; Agent-based modeling; The Netherlands; Survey; Community/Rural/Urban Development; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/120639

Expert opinion and cuisine reputation in the market for restaurant meals
Provedor de dados: 31
Autores: Fogarty,   James Joseph.
As food is an experience good, the market for restaurant meals is a market where the cost of acquiring information regarding quality is relatively high. In such markets consumers often turn to reputation measures to guide purchase decisions. As Australia does not have a longstanding cuisine style of its own, and given Australia has been open to substantial immigration inflows since federation, it represents an especially appropriate market to study regarding the impact of individual restaurant reputation and collective cuisine reputation on meal prices. The following study uses the hedonic price approach to investigate the implicit price of individual reputation indicators, cuisine type reputation indicators, and other objective indicators in the market...
Tipo: Conference Paper or Presentation
Palavras-chave: Expert Opinion; Food; Hedonic Pricing; Research Methods/ Statistical Methods; D12; Q18; Z10.
Ano: 2010
URL: http://purl.umn.edu/59078

Stata tip 30: May the source be with you
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117566

Estimation and inference in dynamic unbalanced panel-data models with a small number of individuals
Provedor de dados: 31
Autores: Bruno,   Giovanni S. F.
This article describes a new Stata routine, xtlsdvc, that computes bias-corrected least-squares dummy variable (LSDV) estimators and their bootstrap variance–covariance matrix for dynamic (possibly) unbalanced panel-data models with strictly exogenous regressors. A Monte Carlo analysis is carried out to evaluate the finite-sample performance of the bias-corrected LSDV estimators in comparison to the original LSDV estimator and three popular N-consistent estimators: Arellano–Bond, Anderson–Hsiao and Blundell–Bond. Results strongly support the bias-corrected LSDV estimators according to bias and root mean squared error criteria when the number of individuals is small.
Tipo: Journal Article
Palavras-chave: Xtlsdvc; Bias approximation; Unbalanced panels; Dynamic panel data; LSDV estimator; Monte Carlo experiment; Bootstrap variance–covariance; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117540

AN ALTERNATIVE SOLUTION TO LINEAR PROGRAMMING PROBLEMS WITH STOCHASTIC INPUT-OUTPUT COEFFICIENTS
Provedor de dados: 31
Autores: Wicks,   John A.; Guise,   John W.B.
Deriving acceptable farm plans where input-output coefficients are stochastic is a complex problem. Previous formulations have required many simplifying assumptions about the stochastic variables in the analysis. This paper presents an alternative approach based on the mean absolute deviation, which permits solution by a conventional linear programming algorithm whilst avoiding some of those assumptions previously required. The formulation also incorporates a stochastic objective function. Examples are provided using the situation of stochastic feed supply with reference to representative sheep-grain farms on the Northern Tablelands of New South Wales. Results from these suggest that this alternative approach is a distinct improvement on earlier stochastic...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/22495

USO DE ANÁLISE ESTATÍSTICA MULTIVARIADA PARA TIPIFICAÇÃO DE PRODUTORES DE LEITE DE MINAS GERAIS
Provedor de dados: 31
Autores: Neto,   Armando Chinelatto; Castro,   Gilmar Pinheiro Cunha; Lima,   Joao Eustaquio de.
The present work had as its main objective to identify and characterize milk production systems through methods of multivaried statistical analysis. Factorial analysis, cluster, discriminant and canonical correlation were utilized. The production gradation and defrayal were the main classification criterium among the productors. Combining the results obtained with the cluster analysis and the canonical correlation analysis, the second classification analysis aggregates the grazing lands and the care with the flock health. Three productors groups were identified, among which the first one is prominent for aggregating about 90% of the total analyzed and is composed by relatively smaller productors. The discriminant analysis and the measuring among financial...
Tipo: Journal Article
Palavras-chave: Multivaried analysis; Milk cattle raising; Minas Gerais.; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/44039

Maximum simulated likelihood estimation of random–effects dynamic probit models with autocorrelated errors
Provedor de dados: 31
Autores: Stewart,   Mark B.
This paper investigates using maximum simulated likelihood (MSL) estimation for random-effects dynamic probit models with autocorrelated errors. It presents and illustrates a new Stata command, redpace, for this estimator. The paper also compares using pseudorandom numbers and Halton sequences of quasirandom numbers for MSL estimation of these models.
Tipo: Journal Article
Palavras-chave: Redpace; Simulation estimation; Maximum simulated likelihood; Halton sequences; Autocorrelated errors; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117576

The welfare impact of targeted transfers to poor households
Provedor de dados: 31
Autores: Pauw,   Kalie.
Despite widespread poverty there is general consensus among policymakers about the preference of targeted welfare transfers over non-targeted grants due to the budgetary implications of the latter. Targeting, however, adds to the administrative complexities of disbursing welfare grants, thus introducing a cost dimension that is as yet largely unexplored. In this paper a series of targeted transfer simulations are run in a general equilibrium model calibrated with a Social Accounting Matrix for South Africa. Deficit financing and tax replacement policies are considered as financing options, assuming a hypothetical budget constraint of R15 billion. The effectiveness of broad targeting and a low per capita transfer value versus narrow targeting and high...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Government Expenditures and Welfare Programs; Consumer/Household Economics; Research Methods/ Statistical Methods; C68; H50.
Ano: 2005
URL: http://purl.umn.edu/58068

Structural choice analysis with nested logit models
Provedor de dados: 31
Autores: Heiss,   Florian.
The nested logit model has become an important tool for the empirical analysis of discrete outcomes. There is some confusion about its specification of the outcome probabilities. Two major variants show up in the literature. This paper compares both and finds that one of them (called random utility maximization nested logit, RUMNL) is preferable in most situations. Since the command nlogit of Stata 7.0 implements the other variant (called non-normalized nested logit, NNNL), an implementation of RUMNL called nlogitrum is introduced. Numerous examples support and illustrate the differences between both specifications.
Tipo: Journal Article
Palavras-chave: Nlogitdn; Nlogitrum; Nested logit model; Discrete choice; Random utility maximization model; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115999

Governance Structure, Perception and Innovation in Credence Food Transactions: The Role of Community Networks
Provedor de dados: 31
Autores: Pascucci,   Stefano.
In this paper we use a combination of behavioral and new institutional economic perspectives to look at the transactions of “sustainable‐oriented” foods (e.g. organic food, fair trade, etc.) which often assume the characteristic of credence goods. When credence attributes are involved in the transaction (e.g. safety, fairness, etc.) information asymmetry and uncertainty tend to reduce the likelihood of different parties to enter in the transaction1. Because spot markets are unlikely to be used in this type of transactions, typical solutions are the use of hybrids, vertical integration and public monitoring (Vetter and Karantininis, 2002; Ménard and Valceschini, 2005). Moreover both consumers and producers (e.g. farmers) look at these products from a more...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100591

Private Requirements by European Retailers: Impact on French Exporters
Provedor de dados: 31
Autores: Latouche,   Karine; Chevassus-Lozza,   Emmanuelle; Persillet,   Vanessa; Harel,   Monique.
Based on recent development of international economics, this paper aims to evaluate in what extent private standards impact trade, and more precisely trade of French agri‐food firms. Our paper explores an original "handmade" database identifying French agri‐food firms which are certified with the International Food Standard – IFS– and/or the British Retail Consortium standard – BRC. From this dataset, one can analyse the characteristics and the export behaviour of certified firms compared to that of the non certified ones. First we look at the productivity of the firms; second, we look at export behaviour of the firms: does a certification such as BRC imply export orientation of the firm? Then we propose the estimation of Chaney’s model (2008) to test for...
Tipo: Conference Paper or Presentation
Palavras-chave: Private standards; IFS/BRC; Trade costs; Productivity; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100457

Some Thoughts on Replication in Empirical Econometrics
Provedor de dados: 31
Autores: Tomek,   William G.
Tipo: Working Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/121349

THE PROBABILITY DISTRIBUTION OF THE AVERAGE MARGINAL PRODUCTS OF COBB-DOUGLAS FACTORS WITH APPLICATIONS
Provedor de dados: 31
Autores: Alaouze,   Chris M.
The comparative productivity of inputs is often the focus of applied studies of production. For example, one might wish to compare the marginal product of water in irrigation districts to provide guidelines for capital investment in new water projects or to assist in water allocation decisions.  The purpose of this note is to illustrate a straightforward econometric method for making such comparisons. It is assumed that panel data are available for T periods on N cross-sectional units and that output is produced according to a stochastic Cobb-Douglas production function. The Cobb-Douglas function was chosen because it has a simple formula for the marginal product and has been found to perform well in studies of agricultural production. The statistical...
Tipo: Journal Article
Palavras-chave: Production Economics; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/22964

A TWO-STAGE MODEL OF THE DEMAND FOR SPECIALTY CROP INSURANCE
Provedor de dados: 31
Autores: Knox,   Lyle; Richards,   Timothy J.
Legislators are considering raising catastrophic (CAT 50% coverage) crop insurance premiums.  However, estimates of a two-stage coverage-choice and participation model using county-level data from California grape growers show that the demand for CAT insurance is price-elastic, therefore, premium increases will worsen the financial performance of the grape-insurance program.
Tipo: Conference Paper or Presentation
Palavras-chave: Crop insurance; Discrete / continuous choice; Grapes; Multinomial logit; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1999
URL: http://purl.umn.edu/21681

Indicators
Provedor de dados: 31
Autores: Kaufman,   Phillip R.; Claassen,   Roger.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121025

A critique of "Identifying structural equations through the nonlinearity of a single price gradient" and "Identifying structural equations with single market data" by Rob Mendelsohn
Provedor de dados: 31
Autores: Hanemann,   W. Michael.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/6283

Stata tip 27: Classifying data points on scatter plots
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117552

Multiple regression analysis of the net income and consumption expenditure of Chinese rural households during 2007
Provedor de dados: 31
Autores: Da,   Wa; Xiao,   Hong; Zhuo,   Ma.
We use the regression analysis method of multivariate statistical analysis to establish a multiple linear regression model about the net income and consumption expenditure of Chinese rural households during the year 2007. This paper analyzes the internal relation between the net income and consumption expenditure of Chinese rural households according to the regression result. Some reasonable suggestions are put forward for raising the income of rural households and stimulating consumption.
Tipo: Thesis or Dissertation
Palavras-chave: Rural households; Income; Expenditure; Regression analysis; China; Consumer/Household Economics; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53439

On Resolving Multiple Optima in Linear Programming
Provedor de dados: 31
Autores: Drynan,   Ross G.
Although the solution to a linear programming problem is not necessarily unique, the theoretical and practical implications of multiple optima have not been thoroughly discussed by agricultural economists. Recently there have been calls for greater recognition, resolution and exploitation of multiplicity. In this note, it is argued that previous recommendations for resolving multiplicity are restrictive both procedurally and conceptually. An alternative and more general approach is outlined.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/12577

A bioeconomic model for determining the optimal response to a new weed incursion in Australian cropping systems
Provedor de dados: 31
Autores: Jayasuriya,   Rohan T.; Jones,   Randall E.
Invasions by non-indigenous plant species pose serious economic threats to Australian agricultural industries. When an invasion is discovered a decision has to be made as to whether to attempt to eradicate it, contain it or do nothing. These decisions should be based on long term benefits and costs. This paper describes a bioeconomic simulation framework with a mathematical model representing weed spread linked to a dynamic programming model to provide a means of determining the economically optimal weed management strategies over time. The modelling framework is used to evaluate case study invasive weed control problems in the Australian grains industry.
Tipo: Conference Paper or Presentation
Palavras-chave: Weeds; Incursion; Bioeconomic model; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6015

Making regression tables simplified
Provedor de dados: 31
Autores: Jann,   Ben.
estout, introduced by Jann (Stata Journal 5: 288–308), is a useful tool for producing regression tables from stored estimates. However, its syntax is relatively complex and commands may turn out long even for simple tables. Furthermore, having to store the estimates beforehand can be cumbersome. To facilitate the production of regression tables, I therefore present here two new commands called eststo and esttab. eststo is a wrapper for official Stata’s estimates store and simplifies the storing of estimation results for tabulation. esttab, on the other hand, is a wrapper for estout and simplifies compiling nice-looking tables from the stored estimates without much typing. I also provide updates to estout and estadd.
Tipo: Article
Palavras-chave: Csv; Estadd; Estimates; Estout; Eststo; Esttab; Excel; Html; Latex; Regression table; Rtf; Word; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119271

FACTORS AFFECTING WHEAT PROTEIN PREMIUMS
Provedor de dados: 31
Autores: Parcell,   Joseph L.; Stiegert,   Kyle W.
This study used Rosen's methodology of deriving a marginal implicit price series from traditional hedonic modeling and then using this series to estimate a demand model.  This procedure was applied to Kansas Hard Red Winter wheat protein.  Results were mixed.  Own-district protein level was not economically significant; however, an increase in other Kansas district's protein level and the North Dakota Hard Red Spring protein level may have a slight economic impact on own-district protein premium.  The results of this study indicate that new varieties of wheat developed that increase protein content without loss of yield and that are regional specific can impact the price or wheat in other areas.
Tipo: Conference Paper or Presentation
Palavras-chave: Wheat; Characteristic Demand Model; Protein; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21524

Social Preferences and Voting: An Exploration Using a Novel Preference Revealing Mechanism
Provedor de dados: 31
Autores: Messer,   Kent D.; Poe,   Gregory L.; Rondeau,   Daniel; Schulze,   William D.; Vossler,   Christian A.
Public referenda are frequently used to determine the provision of public goods. As public programs have distributional consequences, a compelling question is what role if any social preferences have on voting behavior. This paper explores this issue using laboratory experiments wherein voting outcomes lead to a known distribution of net benefits across participants. Preferences are elicited using a novel Random Price Voting Mechanism (RPVM), which is a more parsimonious mechanism than dichotomous choice referenda, but gives consistent results. Results suggest that social preferences, in particular a social efficiency motive, lead to economically meaningful deviations from self-interested voting choices and increase the likelihood that welfare-enhancing...
Tipo: Working or Discussion Paper
Palavras-chave: Institutional and Behavioral Economics; Research Methods/ Statistical Methods; C91; C92; D64; D72; H41.
Ano: 2008
URL: http://purl.umn.edu/51132

A TEST OF CONTINGENT MARKET BID ELICITATION PROCEDURES FOR PIECEWISE VALUATION
Provedor de dados: 31
Autores: Bergstrom,   John C.; Stoll,   John R.
Economists are frequently faced with the task of valuing commodity package components. The valuation of specific impacts of public policies is a case in point. Two contingent market bid elicitation procedures were tested for valuing changes in single components of multicomponent government program. Results of the test suggested that respondents provided more accurate component to piecewise valuation when a two-step bidding approach, rather than a one-step approach was used. Thus, there is evidence that a two-step approach which helps respondents to isolate valuations for package components is perhaps a preferable bid elicitation procedure for piecewise valuation.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/32234

INDIAN STATE-LEVEL RICE PRODUCTIVITY AND ITS IMPACT ON POVERTY ALLEVIATION
Provedor de dados: 31
Autores: Shaik,   Saleem; Dayakar,   Benhur; Janaiah,   Aldas.
This paper has a three fold contribution to the existing literature - 1) Indian state level sorghum input and output data for the period 1970-71 to 2000-01 is collected, 2) non-parametric and parametric productivity measures are estimated, and 3) examine the impact of percent acreage under high yielding varieties and irrigation, state domestic product, productivity and five year plans on poverty alleviation using error component and SUR models.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20228

DOING POLICY IN THE LAB! OPTIONS FOR THE FUTURE USE OF MODEL-BASED POLICY ANALYSIS FOR COMPLEX DECISION-MAKING
Provedor de dados: 31
Autores: Happe,   Kathrin; Balmann,   Alfons.
For models to have an impact on policy-making, they need to be used. Exploring the relationships between policy models, model uptake and policy dynamics is the core of this article. What particular role can policy models play in the analysis and design of policies? Which factors facilitate (inhibit) the uptake of models by policy-makers? What are possible pathways to further develop modelling approaches to better meet the challenges facing agriculture today? In this paper, we address these issues from three different points of view, each of which should shed some light on the subject. The first point of view discusses models in the framework of complex adaptive systems and uncertainty. The second point of view looks at the dynamic interplay between...
Tipo: Conference Paper or Presentation
Palavras-chave: Modelling; Complexity; Participatory modelling; Policy analysis; Model use; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6588

PRONAF A SALVAÇÃO DA LAVOURA OU PROBLEMA? UMA ANÁLISE DO NÍVEL DE SATISFAÇÃO DOS PRODUTORES
Provedor de dados: 31
Autores: Coronel,   Daniel Arruda; Sonaglio,   Claudia Maria; Angelo,   Helena Dezordi; Zamberlan,   Carlos Otavio; Silva,   Angelita Freitas Da.
Este artigo demonstra conceitos e modelos relacionados à mensuração da satisfação de clientes, focando a satisfação dos agricultores do Assentamento Itamarati I, com relação aos financiamentos do Pronaf (Programa de fortalecimento da agricultura familiar) adquiridos no Banco do Brasil de Ponta Porã-MS. Para isso foram entrevistados 179 assentados. A metodologia utilizada envolveu uma fundamentação teórica embasada em pesquisa bibliográfica, que abordou os principais conceitos relacionados ao tema, como Satisfação do Consumidor e Índices de Satisfação do Consumidor, sendo aplicado neste artigo o índice Americano (ACSI). Posteriormente, foi desenvolvida uma pesquisa descritiva de corte transversal, com levantamento dos dados de modo quantitativo. Também foi...
Tipo: Conference Paper or Presentation
Palavras-chave: Pronaf; Satisfação dos produtores; Análise fatorial; Pronaf; Satisfaction of the producers; Factorial analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/108565

Non-Market Values and Optimal Marine Reserve Switching
Provedor de dados: 31
Autores: Yamazaki,   Satoshi; Grafton,   R. Quentin; Kompas,   Tom.
A stochastic bio-economic model is constructed to analyse the effects of marine reserve ‘switching’ between a ‘no take’ area and a harvested area. The model accounts for both market and non-market values of the fishery. Estimated parameters from the red throat emperor fishery from the Great Barrier Reef are used.   Simulations show that an optimal switching strategy is, under a range of scenarios, preferred to fixed reserve and no reserve strategies.  An important outcome is that the non-market values associated with the size of the fishery substantially affect both the returns from switching and the closure time.
Tipo: Report
Palavras-chave: Marine reserves; Stochastic control; Non-market values; Environmental Economics and Policy; Research Methods/ Statistical Methods; C61; Q22.
Ano: 2009
URL: http://purl.umn.edu/94825

TECHNOLOGICAL CHANGE AND WELFARE IN AN ECONOMY WITH DISTORTIONS
Provedor de dados: 31
Autores: Perrin,   Richard K.; Fulginiti,   Lilyan E.
Traditional measures of the benefits of technological change use producer prices.  Consumer-oriented measures are more appropriate but they require knowledge of price impacts.  They may diverge in the presence of distortions.  This paper shows that in general equilibrium they are interrelated differing by the price effect of the technological change.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/21013

TECHNOLOGIES AND LOCALIZED TECHNICAL CHANGE
Provedor de dados: 31
Autores: Morrison Paul,   Catherine J.; Sauer,   Johannes.
D2_3
Tipo: Conference Paper or Presentation
Palavras-chave: Heterogenous Technologies; Transformation Function; Localized Technical Change; Production Economics; Research Methods/ Statistical Methods; Q12; O33; C35.
Ano: 2010
URL: http://purl.umn.edu/93963

Estimation and Inference for Threshold Effects in Panel Data Stochastic Frontier Models
Provedor de dados: 31
Autores: Yelou,   Clement; Larue,   Bruno; Tran,   Kien C.
One of the most enduring problems in cross-section or panel data models is heterogeneity among individual observations. Different approaches have been proposed to deal with this issue, but threshold regression models offer intuitively appealing econometric methods to account for heterogeneity. We propose three different estimators that can accommodate multiple thresholds. The first two, allowing respectively for fixed and random effects, assume that the firms’ specific inefficiency scores are time-invariant while the third one allows for time-varying inefficiency scores. We rely on a likelihood ratio test with m − 1 regimes under the null against m regimes. Testing for threshold effects is problematic because of the presence of a nuisance parameter which...
Tipo: Conference Paper or Presentation
Palavras-chave: Stochastic frontier models; Threshold regression; Technical efficiency; Bootstrap; Dairy production; C12; C13; C23; C52; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/9769

LINEAR PROGRAMMING - AN EVALUATION
Provedor de dados: 31
Autores: Musgrave,   Warren F.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1963
URL: http://purl.umn.edu/23009

TESTING FOR THE MONOTONE LIKELIHOOD RATIO ASSUMPTION
Provedor de dados: 31
Autores: Roosen,   Jutta; Hennessy,   David A.
Monotonicity of the likelihood ratio for conditioned densities is a common technical assumption in economic models. But we have found no empirical tests for its plausibility. This paper develops such a test based on the theory of order-restricted inference, which is robust with respect to the correlation structure of the distributions being compared. We apply the test to study the technology revealed by agricultural production experiments. For the data under scrutiny, the results support the assumption of the monotone likelihood ratio. In a second application, we find some support for the assumption of affiliation among bids cast in a multiple-round Vickrey auction for a consumption good.
Tipo: Working or Discussion Paper
Palavras-chave: Affiliation; Auction; Likelihood ratio; Order-restricted inference; Stochastic order; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/18398

Residual diagnostics for cross-section time series regression models
Provedor de dados: 31
Autores: Baum,   Christopher F.
These routines support the diagnosis of groupwise heteroskedasticity and cross-sectional correlation in the context of a regression model fit to pooled cross-section time series (xt) data.
Tipo: Journal Article
Palavras-chave: Fixed effects; Groupwise heteroskedasticity; Contemporaneous correlation; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115940

Improving Forecast Performance with Reduced Parameter, Large Order AR Models
Provedor de dados: 31
Autores: Ramirez,   Octavio A.; Dorfman,   Jeffrey H.
Tipo: Conference Paper or Presentation
Palavras-chave: Time series; Modelling; Bayesian probability; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/60917

THE IMPACT OF NEGATIVITY ON SEPARABILITY TESTING
Provedor de dados: 31
Autores: Eales,   James S.; Henderson,   Jason R.
While performing separability tests, studies rarely checked negativity to ensure the appropriate curvature of the expenditure function.  The effect of imposing negativity on the results of separability tests is examined. Findings indicate that imposing negativity can affect separability tests in demand systems that do not spontaneously satisfy the curvature restriction.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21817

Valuing international marine resources: A meta-analysis on the Baltic Sea
Provedor de dados: 31
Autores: Ahtiainen,   Heini.
The study uses meta-analysis to provide insights into the value of international marine resources, illustrating the issue with the case of the Baltic Sea. Willingness to pay for water quality improvements varies systematically with factors such as a country’s income level, characteristics of the change in water quality, water body type, study year and methodology. The results of the meta analysis are applied to benefit transfer in order to assess the distribution of the benefits of marine protection measures between the Baltic Sea countries and to compare the results with previous research. The net benefits of protecting the Baltic are positive, but they are asymmetrically distributed between the littoral countries.
Tipo: Working or Discussion Paper
Palavras-chave: Meta-analysis; Water quality valuation; Marine areas; The Baltic Sea; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q26; Q51.
Ano: 2009
URL: http://purl.umn.edu/48915

PESQUISA EM ÍNDICE DE PREÇOS: ANTECEDENTES HISTÓRICOS E PRINCIPAIS ABORDAGENS
Provedor de dados: 31
Autores: Machado,   Andre Grossi; Figueiredo,   Reginaldo Santana.
O presente trabalho objetiva revisar os antecedentes históricos da pesquisa de uma das ferramentas mais utilizadas e divulgadas em estudos econômicos em todo o mundo e de grande atratividade e aplicação no agronegócio: os índices de preços. Observa-se que o volume de trabalhos, discussões e estudos no decorrer do tempo, além de ilustrar a importância do assunto, permitiu o constante melhoramento dos métodos de cálculo e a defesa de diferentes pontos de vistas, levando inclusive à divisão de seu corpo teórico em algumas principais linhas ou correntes de pesquisa. A história da pesquisa tem seus primeiros registros no início do século XVIII, desenvolve-se sob vários enfoques e se enriquece ainda mais a partir do século XX. Esses enfoques gradualmente...
Tipo: Conference Paper or Presentation
Palavras-chave: Índice de preços; Abordagem estatística; Abordagem axiomática; Abordagem econômica; Price indexes; Statistical approach; Axiomatic approach; Economical approach; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/109726

INFORMATION VALUE AND RISK PREMIUM IN AGRICULTURAL PRODUCTION UNDER RISK: THE CASE OF SPLIT NITROGEN APPLICATION FOR CORN
Provedor de dados: 31
Autores: Thomas,   Alban; Bontems,   Philippe.
This paper considers an agricultural production model of sequential nitrogen application under risk. Because of random shocks between successive production stages, optimal fertilization decisions depend on the magnitude of farmers' risk aversion (risk premium), and the possibility for farmers to process information (value of information). We propose a joint estimation procedure of technology and risk aversion parameters, using a structural, simulation-based econometric technique. Parameter estimates for the representative farmer's utility function allow to compute both the value of information and the risk premium for farmers. Those account together for about 30 percent of fertilizer cost for Midwest corn producers.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1998
URL: http://purl.umn.edu/20844

Do-it-yourself shuffling and the number of runs under randomness
Provedor de dados: 31
Autores: Smeeton,   Nigel; Cox,   Nicholas J.
A common class of problem in statistical science is estimating, as a benchmark, the probability of some event under randomness. For example, in a sequence of events in which several outcomes are possible and the length of the sequence and number of outcomes of each type known, the number of runs gives an indication of whether the outcomes are random, clustered, or alternating. This note explains and illustrates a simple method of random shuffling that is often useful. We show how the conditional probability distribution of the number of runs may be derived easily in Stata, thus yielding p-values for testing the null hypothesis that the type of outcome is random. We also compare our direct approach with that using the simulate command.
Tipo: Journal Article
Palavras-chave: Alternation; Categorical data; Clustering; Conditional distribution; Forvalues; P-value; Permutation; Run; Sequence; Simulate; Simulation; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116095

Supply Chain and Network Performance: Metrics for Profitability, Productivity, and Efficiency
Provedor de dados: 31
Autores: Weaver,   Robert D.
The architecture of the firm involves determination of a boundary that encompasses the functions managed by the firm. The past decade has seen substantial reorganization of firms where vertical or horizontal integration has been unbundled into weaker forms of collaborations including value chains and networks. This observation has forced a re‐conceptualization of the boundaries of the firm to incorporate such collaborations. These collaborations are virtual and highly dynamic. They emerge and persist when two conditions are met. First, they must enable generation of greater value than might be attained through independent operation and anonymous transactions through markets. Second, the resulting growth must be shared with members in a way that retains...
Tipo: Journal Article
Palavras-chave: Networks; Collaboration; Metrics; Productivity; Efficiency; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/91142

EU-WIDE FARM TYPES SUPPLY IN CAPRI - HOW TO CONSISTENTLY DISAGGREGATE SECTOR MODELS INTO FARM TYPE MODEL
Provedor de dados: 31
Autores: Gocht,   Alexander; Britz,   Wolfgang.
C3_3
Tipo: Conference Paper or Presentation
Palavras-chave: EU-wide farm supply analysis; Highest posterior density estimator; CAPRI; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93960

Stata tip 10: Fine control of axis title positions
Provedor de dados: 31
Autores: Ryan,   Philip; Winter,   Nicholas J.G.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116254

Markets for ecosystem services: Applying the concepts
Provedor de dados: 31
Autores: Whitten,   Stuart M.; Salzman,   James; Shelton,   Dave; Procter,   Wendy.
In recent times, use of market-based instruments to facilitate enhanced protection or production of ecosystem services has achieved a high public profile. However, much work remains to apply these tools in practice. Particular issues include definition and measurement of ecosystem services, development of institutions and mechanisms to facilitate trade and integration of these instruments into the broader natural resource management agenda and toolbox. In this paper these issues are explored with respect to pilot markets for ecosystem services in three case study catchments. Emphasis is placed on pilot selection rationale and identification of key facilitative mechanisms and institutions.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/58269

CAN ECONOMETRIC ANALYSIS MAKE (AGRICULTURAL) ECONOMICS A HARD SCIENCE? CRITICAL REMARKS AND IMPLICATIONS FOR ECONOMIC METHODOLOGY
Provedor de dados: 31
Autores: Petrick,   Martin.
This paper argues that mainstream economics does not follow the positivist research tradition it (often implicitly) claims to follow and expresses some serious doubt that econometrics in particular can make economics a hard science. Mathematical rigour and sophisticated statistical techniques may be regarded as persuasive analytical tools in economics, but their mere application does not guarantee good research practice. The paper outlines an alternative methodological view of pragmatic instrumentalism in which the well known tools of economic analysis can find a new place. Instead of relying on a narrow rule that purports to produce universal truth, this view encourages to increase the target area for questioning and probing. Much more attention is paid...
Tipo: Working or Discussion Paper
Palavras-chave: Economic method; Econometrics; Philosophy of science; Pragmatic instrumentalism; Research Methods/ Statistical Methods; B41; C10.
Ano: 2004
URL: http://purl.umn.edu/14911

THE EFFECTS OF CAP REFORM ON THE PERIURBAN AGRICULTURAL AREA IN THE PLAIN OF THE CITY OF ASSISI (CENTRAL ITALY)
Provedor de dados: 31
Autores: Torquati,   Biancamaria; Giacche,   Giulia; Taglioni,   Chiara; Musotti,   Francesco.
In periurban areas agriculture can assume a multifunctional role that includes landscape conservation, sustainable resource management, biodiversity conservation, leisure activities, and can also maintain adequate conditions in densely populated areas for a safe and habitable environment. This study investigates the effects of the introduction of single farm payment on the periurban agricultural area in the plain of the City of Assisi, an area with a strong landscape value. A survey was carried out to determine: changes in production, changes on farm incomes, structural adjustments, the level of multifunctionality of periurban agriculture. Moreover, a survey of 355 residents was made to assess their willingness to pay for some positive externalities of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Periurban Agriculture; Cap Reform; Economic Valuation; Contingent Valuation; Assisi; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q10; Q18.
Ano: 2008
URL: http://purl.umn.edu/44803

The Assignment Technique: Some Agricultural Applications of a Simple Optimizing Procedure
Provedor de dados: 31
Autores: Hardaker,   J. Brian.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1967
URL: http://purl.umn.edu/9110

Generalized ordered logit/partial proportional odds models for ordinal dependent variables
Provedor de dados: 31
Autores: Williams,   Richard A.
This article describes the gologit2 program for generalized ordered logit models. gologit2 is inspired by Vincent Fu’s gologit routine (Stata Technical Bulletin Reprints 8: 160–164) and is backward compatible with it but offers several additional powerful options. A major strength of gologit2 is that it can fit three special cases of the generalized model: the proportional odds/parallel-lines model, the partial proportional odds model, and the logistic regression model. Hence, gologit2 can fit models that are less restrictive than the parallel-lines models fitted by ologit (whose assumptions are often violated) but more parsimonious and interpretable than those fitted by a nonordinal method, such as multinomial logistic regression (i.e., mlogit). Other key...
Tipo: Journal Article
Palavras-chave: Gologit2; Gologit; Logistic regression; Ordinal regression; Proportional odds; Partial proportional odds; Generalized ordered logit model; Parallel-lines model; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117557

Speaking Stata: In praise of trigonometric predictors
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Using sine and cosine terms as predictors in modeling periodic time series and other kinds of periodic responses is a long-established technique, but it is often overlooked in many courses or textbooks. Such trigonometric regression is straightforward in Stata through applications of existing commands. I give various examples using classic periodic datasets on the motion of the asteroid Pallas and the daily rhythm of birth numbers. I make a brief connection to polynomial-trigonometric regression.
Tipo: Article
Palavras-chave: Circular regression; Fourier regression; Harmonic regression; Periodic regression; Polynomial-trigonometric regression; Trigonometric regression; Sine; Cosine; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119245

Cycle of Knowledge in the Management of the Supply Chain of Corn for Human Consumption
Provedor de dados: 31
Autores: Martinez Soto,   Moises E.; Rodriguez Monroy,   Carlos; Fuentes-Pila,   Joaquin; Morris,   Anne; Gil‐Araujo,   M.; Velasco,   Julia.
The objective of this study is to characterize the cycle of knowledge in the supply chain of the industry of corn for human consumption. White corn is cultivated almost exclusively for human consumption and it has a significant value in the food supply in countries whose diet has a high proportion of this variety of corn, such as: Venezuela, México and Colombia in America, and the Republic of South Africa and Sahel countries in Africa. Corn is produced in Venezuela, under rainfed conditions and in a highly mechanized production system. The cycle of knowledge is defined as a progressive spiral in which knowledge is created, stored, transferred, applied and preserved, in order to increase the competitiveness and sustainability of organizations and companies...
Tipo: Conference Paper or Presentation
Palavras-chave: Knowledge Cycle; Industry of White Corn; Food Supply Chain; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100510

PRIOR INFORMATION AND HEURISTIC RIDGE REGRESSION FOR PRODUCTION FUNCTION ESTIMATION
Provedor de dados: 31
Autores: Burt,   Oscar R.; Frank,   Michael D.; Beattie,   Bruce R.
A heuristic criterion for choosing an acceptable level of bias in ridge regression is presented. The criterion is based on a noncentral F-test of the stochastic restrictions implicit in the ridge estimator. An appropriate significance level for the test is based on conjunctive use of strong and weak mean square error criteria. The procedure is illustrated in estimating a Cobb-Douglas production function for the Central Valley of California using factor shares as priors rather than the null vector. Preliminary results suggest that a conjunctive SMSE/WMSE criterion with more “reasonable” priors selects an estimator with smaller bias than ridge trace.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/32237

Consequences of Data Error in Aggregate Indicators: Evidence from the Human Development Index
Provedor de dados: 31
Autores: Wolff,   Hendrik; Chong,   Howard; Auffhammer,   Maximilian.
This paper examines the consequences of data error in data series used to construct aggregate indicators. Using the most popular indicator of country level economic development, the Human Development Index (HDI), we identify three separate sources of data error. We propose a simple statistical framework to investigate how data error may bias rank assignments and identify two striking consequences for the HDI. First, using the cutoff values used by the United Nations to assign a country as 'low', 'medium', or 'high' developed, we find that currently up to 45% of developing countries are misclassified. Moreover, by replicating prior development/macroeconomic studies, we find that key estimated parameters such as Gini coefficients and speed of convergence...
Tipo: Working or Discussion Paper
Palavras-chave: Measurement Error; International Comparative Statistics; Research Methods/ Statistical Methods; O10; C82.
Ano: 2008
URL: http://purl.umn.edu/6502

AN ANALYSIS OF FACTORS INFLUENCING ADOPTION OF BMPS AMONG LOUISIANA SUGARCANE PRODUCERS
Provedor de dados: 31
Autores: Henning,   Steven A.; Cardona,   Hugo.
Multivariate probit analysis of BMP adoption, based on Louisiana sugarcane producer data, indicates that education and cost-sharing programs are effective means of increasing adoption rates.  Results also indicate that contemporaneous correlation exists within and between management measures, implying a policy strategy of coordinating education and cost-sharing programs to maximize effectiveness.
Tipo: Conference Paper or Presentation
Palavras-chave: Best management practices; Multivariate probit analysis; Farm Management; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21838

Associations between Poverty and Socio-economic Variables in a Typical Tswana Rural Village: New Insights
Provedor de dados: 31
Autores: Moepeng,   Pelotshweu T.; Tisdell,   Clement A.
This paper reports on and analyzes primary survey data obtained from a survey of household heads on the rural village of Nshakazhogwe, a typical rural village in northeast Botswana. It examines the associations between the incidence of poverty of household heads in this village and the values of several socio-economic variables. The socio-economic variables considered are the age of the household head, the level of their educational attainment, their gender, the number of sources from which they obtain their income, whether or not they have some wage employment, whether they receive income transfers privately or from the government, whether they conduct a home business and whether or not they obtain income from sales of livestock, crops or natural...
Tipo: Working Paper
Palavras-chave: Botswana; Poverty; Incidence of Poverty; Household heads; Gender; Education; Community/Rural/Urban Development; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/123546

OPTIMAL FLUID MILK ADVERTISING IN NEW YORK STATE: A CONTROL MODEL
Provedor de dados: 31
Autores: Liu,   Donald J.; Forker,   Olan D.
Generic dairy promotion is big business. The 1983 Dairy and Tobacco Adjustment Act requires that all dairy farmers pay a promotion assessment of 15 cents per hundredweight on all milk sold commercially. Of the total assessment, up to 10 cents may be retained locally to fund regional or state dairy product advertising. The funding for national and state programs combined totals over $200 million annually. Thus, the program involves high stakes and, if not well conducted, can result in substantial losses in opportunity costs to dairy farmers. The size of the potential losses emphasizes the importance of understanding the economics of dairy promotion and the need to increase the efficiency of promotional efforts.  The purpose of this study is to use a...
Tipo: Working or Discussion Paper
Palavras-chave: Livestock Production/Industries; Marketing; Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/6880

ANALIZING WATER FRAMEWORK DIRECTIVE IMPACTS USING A MULTINOMIAL LOGIT LAND USE MODEL
Provedor de dados: 31
Autores: Fezzi,   Carlo; Bateman,   Ian J.; Day,   Brett H.; Posen,   Paulette; Rigby,   Dan.
We develop a two-stage, multinomial logit model of UK land use to investigate the impact of policy changes upon agriculture. The model utilizes a large panel database covering the entirety of England and Wales for 14 years between 1969 and 2004 integrated with the economic and physical environment determinants of all major agricultural land use types. Our model performs well in out-of-sample prediction of current land use and we use it to assess a proposed implementation of the Water Framework Directive via a tax on fertilizer. Results indicate that such policy change would generate substantial switching from arable to grassland systems, reducing significantly the amount of nitrate leaching into UK water-bodies.
Tipo: Conference Paper or Presentation
Palavras-chave: Water Framework Directive; Land use models; Discrete choice models; Multinomial logit; Agricultural and Food Policy; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6666

Comparisons of LSMS-ISA data collection and dissemination efforts in Central America
Provedor de dados: 31
Autores: Zúniga-González,   Carlos Alberto.
This paper was presented in The Third Wye Global Conference. The Wye City Group on Rural Statistics and Agricultural Household Income is hosting its third global conference on agricultural and rural household statistics. The conference will be hosted by the Economic Research Service of the United States Department of Agriculture and is cosponsored by the Food and Agricultural Organization of the United Nations and the World Bank. Conference objectives Support the U.N. • Global Strategy to Improve Agricultural and Rural Statistics by highlighting international needs and opportunities to improve statistics on rural and farm households, and strengthen the process of collecting and disseminating statistics on rural and farm households in OECD and developing...
Tipo: Conference Paper or Presentation
Palavras-chave: Panel Data; LSMS-ISA; MECOVI.; Research Methods/ Statistical Methods; C83; P52; E61.
Ano: 2010
URL: http://purl.umn.edu/90751

Level Shifts and the Illusion of Long Memory in Economic Time Series
Provedor de dados: 31
Autores: Smith,   Aaron D.
When applied to time series processes containing occasional level shifts, the logperiodogram (GPH) estimator often erroneously finds long memory. For a stationary short-memory process with a slowly varying level, I show that the GPH estimator is substantially biased, and I derive an approximation to this bias. The asymptotic bias lies on the (0,1) interval, and its exact value depends on the ratio of the expected number of level shifts to a user-defined bandwidth parameter. Using this result, I formulate the Modified GPH estimator, which has a markedly lower bias. I illustrate this new estimator via applications to soybean prices and stock market volatility.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/11974

A QUADRATIC INVERSE DEMAND SYSTEM
Provedor de dados: 31
Autores: Moro,   Daniele; Sckokai,   Paolo.
We derive a (quadratic) inverse demand system (IQUAIDS), that generalizes the (almost ideal) inverse demand system.  We discuss how the assumptions of separability and concavity can be simultaneously accommodated within the model, thus giving a (locally) separable and concave quadratic demand system.  An empirical application is provided for illustrative purposes.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21560

SUMMARIZING CURVATURE CONDITIONS FOR FLEXIBLE FUNCTIONAL FORMS
Provedor de dados: 31
Autores: Chen,   Adam Zhuo; Huffman,   Wallace E.
This article suggests that the two current approaches of summarizing curvature conditions for certain flexible function forms are neither intuitive nor robust to skewed distribution of exogenous variables. They also ignore the possible correlation pattern between exogenous variables. Arguing that the purpose of summarizing curvature condition is to provide either the changes of aggregated dependent variable with respect to a change of explanatory variable, or curvature conditions of a representative individual, this article proposes two methods to address this issue.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20013

A Nested Logit Model of Strategic Promotion
Provedor de dados: 31
Autores: Richards,   Timothy J.
Retailers use sales "price promotions" for a number of potential reasons.  There is relatively little research, however, on their strategic role among frequently consumed perishable products.  Using a two-stage, nested logit model of retail equilibrium, we show that promotion will be most effective (ie. increase store-level sales) if products are highly differentiated, but stores are relatively similar.  To test this hypothesis, we an oligopolistic model of promotion rivalry with category-level scanner data from the four largest supermarket retailers in a major U.S. metropolitan market.  The results show that promotion has a greater impact on store share than product share, because the elasticity of substitution among stores is larger than the elasticity...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19336

Data Envelopment Analysis as a Complement to Marginal Analysis
Provedor de dados: 31
Autores: Theodoridis,   A.M.; Psychoudakis,   A.; Christofi,   A.
The consideration in the present study is mainly conceptual. The objective is to show how Data Envelopment Analysis (DEA) can be used to reveal the true input-output relations in an industry. In the estimation of a production function it is assumed that all firms use the existing technology efficiently. However, in the real world the observed firms produce homogeneous outputs with differences in factor intensities and in managerial capacity. Hence, inefficiencies are hidden in the estimated production functions. In order to overcome this drawback of the parametric approach and to reveal the true nature of the input-output relations in production, given the available technology, the DEA approach is applied. In this study DEA is applied in order to select...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/44113

Improving Food Security in Africa: Highlights of 25 Years of Research, Capacity-Building, and Outreach.
Provedor de dados: 31
Autores: Food Security Group at Michigan State University.
Decades of research have led to substantially improved understanding of the nature of food insecurity. A combination of economic growth and targeted programs resulted in a steady fall (until the food crisis of 2007/08) in the percentage of the world’s population suffering from undernutrition (from 20% in 1990/92 to 16% in 2006). Yet over a billion people still face both chronic and/or transitory food insecurity due to long-standing problems of inadequate income, low-productivity in agricultural production and marketing, and related problems of poor health and absence of clean water. Assuring adequate food security for such a large share of the world’s population is increasingly challenging due to continuing resource degradation driven by a combination of...
Tipo: Working or Discussion Paper
Palavras-chave: Africa; Food Security; Research; Capacity building; Outreach; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Demand and Price Analysis; Food Security and Poverty; International Development; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Q10; Q18; Q12; Q13.
Ano: 2009
URL: http://purl.umn.edu/55050

Modeling Spatial Sustainability: Spatial Welfare Economics versus Ecological Footprint
Provedor de dados: 31
Autores: Grazi,   Fabio; van den Bergh,   Jeroen C.J.M.; Rietveld,   Piet.
A spatial welfare framework for the analysis of the spatial dimensions of sustainability is developed. It incorporates agglomeration effects, interregional trade, negative environmental externalities and various land use categories. The model is used to compare rankings of spatial configurations according to evaluations based on social welfare and ecological footprint indicators. Five spatial configurations are considered for this purpose. The exercise is operationalized with the help of a two-region model of the economy that is in line with the ‘new economic geography’. Various (counter) examples show that the footprint method is not consistent with an approach aimed at maximum social welfare.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/12212

Pangloss, Pandora and Pareto for the Aspiring Benefit-Cost Analyst
Provedor de dados: 31
Autores: Sinden,   Jack A.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/9344

Do Farmers Hedge Optimally or by Habit? A Bayesian Partial-Adjustment Model of Farmer Hedging
Provedor de dados: 31
Autores: Dorfman,   Jeffrey H.; Karali,   Berna.
Hedging is one of the most important risk management decisions that farmers make and has a potentially large role in the level of profit eventually earned from farming. Using panel data from a survey of Georgia farmers that recorded their hedging decisions for 4 years on four crops, we examine the role of habit, demographics, farm characteristics, and information sources on the hedging decisions made by 57 different farmers. We find that the role of habit varies widely and that estimation of a single habit effect suffers from aggregation bias. Thus, modeling farmer-level heterogeneity in the examination of habit and hedging is crucial.
Tipo: Journal Article
Palavras-chave: Bayesian econometrics; Habit formation; Hedging decisions; Information sources; Agribusiness; Agricultural Finance; Farm Management; Financial Economics; Labor and Human Capital; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; C11; Q12; Q14.
Ano: 2010
URL: http://purl.umn.edu/100519

The Planting Real Option in Cash Rent Valuation
Provedor de dados: 31
Autores: Du,   Xiaodong; Hennessy,   David A.
After entering into farmland rental contracts in the fall, a tenant farmer has the planting flexibility to choose between corn and soybeans. Failure to account for this switching option will bias estimates of what farmers should pay to rent land. Applying contingent claims analysis methods, this study explicitly derives the real option value function. Comparative statics with respect to the volatilities of underlying state variables and their correlations are derived and discussed. Dynamic hedging deltas in this real option context are also developed. Monte Carlo simulation results show that the average cash rent valuation for the real option approach is 11% higher than that for the conventional net present value (NPV) method. The simulated dynamic hedging...
Tipo: Working or Discussion Paper
Palavras-chave: Cash rent; Delta hedging; Monte Carlo simulation; Multivariate GARCH; Real option; Ricardian rent; Farm Management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6307

Honduras Technical Manual: Conceptual Framework and Software Documentation
Provedor de dados: 31
Autores: Mohanty,   Samarendu; Smith,   Darnell B.; Meyers,   William H.; Batres-Marquez,   S. Patricia.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/18644

EINFLUSS DES SCHWEINEZYKLUS AUF DIE PREISTRANSMISSION ZWISCHEN FERKEL- UND SCHLACHTSCHWEINEPREISEN IN NIEDERSACHSEN
Provedor de dados: 31
Autores: Holst,   Carsten; von Cramon-Taubadel,   Stephan.
C1_1
Tipo: Conference Paper or Presentation
Palavras-chave: Vertikale Preistransmission; Asymmetrie; Schweinezyklus; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93951

A Note on the Reliability Tests of Estimates from ARMS Data
Provedor de dados: 31
Autores: Kim,   C.S.; Hallahan,   Charles B.; Lindamood,   W.A.; Schaible,   Glenn D.; Payne,   James.
USDA uses the concept of "publish-ability" rather than statistical reliability of an estimate for quality validation of USDA estimates, which is solely based on the sample size and the coefficient of variation (CV). We demonstrate conceptually how the reliability of the sample mean can be tested by estimating the upper and lower bounds of the confidence interval for an unknown population mean using the CV. However, the reliability test for the sample mean can be made only under the normality assumption. USDA multiple-way Agricultural Resource Management Survey (ARMS) estimates are used to illustrate the relative measure of precision for sample-based estimators.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/31267

Optimal crop protection against climate risk in a dynamic cost-loss decision-making model
Provedor de dados: 31
Autores: Quiroga,   Sonia; Cerda,   Emilio.
Extreme meteorological events have increased over the last decade and it is widely accepted that it is due to climate change. Some of these extremes like drought or frost episodes largely affect agricultural outputs that could face a serious decline. Therefore, additional efforts on technology and adaptation become crucial to reduce the effect of climate change on agricultural production. Protection against adverse weather extremes is a significant component of risk management and large protection decisions need dynamic treatment, such as the vineyards or citrus protection against frost (Murphy et al., 1985), the water management for cereals irrigation in drought shortage contexts, the “options and futures” exchange markets decisions for major crops in...
Tipo: Conference Paper or Presentation
Palavras-chave: Information value; Cost-loss ratio; Dynamic decision models; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Production Economics; Research Methods/ Statistical Methods; C6; Q1.
Ano: 2009
URL: http://purl.umn.edu/51702

ASSESSMENT OF THE OUTPUT OF A STOCHASTIC DECISION MODEL
Provedor de dados: 31
Autores: Hardaker,   J. Brian; Tanago,   A.G.
The concept of stochastic dominance is described and its use is illustrated in relation to the evaluation of the output of a systems simulation model of lucerne haymaking in south-west Spain. Two alternative machinery systems are ranked for various lucerne areas using the criteria of stochastic dominance, and These results are compared with those obtained using mean-variance analysis.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/22321

Review of Maximum Likelihood Estimation with Stata by Gould, Pitblado, and Sribney
Provedor de dados: 31
Autores: Jenkins,   Stephen P.
This article reviews Maximum Likelihood Estimation with Stata by Gould, Pitblado, and Sribney.
Tipo: Journal Article
Palavras-chave: Maximum likelihood; Stata programming; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116200

ORGANIZING SCAN DATA FOR MARKET RESEARCH
Provedor de dados: 31
Autores: Eastwood,   David B.
Two areas of practical problems in creating scan data sets for demand and marketing research are discussed.  The first pertains to organizing scan data for variable weight items into consumer demand categories.  The second is a set of problems associated with the creation of an advertising data set that can be merged with scan data to assess marketing strategies.
Tipo: Journal Article
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/26536

Nonparametric vs parametric binary choice models: An empirical investigation
Provedor de dados: 31
Autores: Bontemps,   Christophe; Racine,   Jeffrey S.; Simioni,   Michel.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/116005

Indicators
Provedor de dados: 31
Autores: Bagi,   Faqir Singh; Reeder,   Richard J.; Kumcu,   Aylin.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121250

AUSTRALIAN AGRICULTURAL STATISTICS: SOME ASPECTS OF THE CLASSIFICATION OF FARMS BY TYPE and DISCUSSION
Provedor de dados: 31
Autores: Walker,   R.G.; Gruen,   Fred H.G.
The recent application of an experimental type classification of farms in New South Wales is, I think, the most significant development in Australian agricultural statistics since the war. This operation, carried out for the year 1955-56, involved the classification of statistical returns for the 78,000 rural holdings in the State, according to the nature of activity on individual holdings. A great deal of teamwork has gone into the planning and development of this classification, (1) and I believe that it will provide useful and reliable statistical results. The project is still in the experimental stage and much remains to be done before a fully operative classification can be applied in all States.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1958
URL: http://purl.umn.edu/22469

A NEW LOOK AT BUDGETING FROM THE STANDPOINT OF LINEAR PROGRAMMING
Provedor de dados: 31
Autores: Candler,   Wilfred V.
This paper will take a new look at budgeting. It will be argued that with the development of linear programming, budgeting can be seen to have several disadvantages as a research tool. The development of linear programming as an aid to farm management research will then be examined. This examination will lead to the development of a slight refinement of conventional budgeting methods. This refinement may reasonably be termed parametric budgeting.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1959
URL: http://purl.umn.edu/22308

Vector Autoregressions, Policy Analysis, and Directed Acyclic Graphs: An Application to the U.S. Economy
Provedor de dados: 31
Autores: Awokuse,   Titus O.; Bessler,   David A.
The paper considers the use of directed acyclic graphs (DAGs), and their construction from observational data with PC-algorithm TETRAD II, in providing over-identifying restrictions on the innovations from a vector autoregression. Results from Sims’ 1986 model of the US economy are replicated and compared using these data-driven techniques. The directed graph results show Sims’ six-variable VAR is not rich enough to provide an unambiguous ordering at usual levels of statistical significance. A significance level in the neighborhood of 30 % is required to find a clear structural ordering. Although the DAG results are in agreement with Sims’ theory-based model for unemployment, differences are noted for the other five variables: income, money supply, price...
Tipo: Journal Article
Palavras-chave: Vector autoregression; Directed graphs; Policy analysis; Research Methods/ Statistical Methods; C1; E1.
Ano: 2003
URL: http://purl.umn.edu/44001

Analysis of profitability and risk in new agriculture in a Himalayan watershed by using dynamic non-linear programming model
Provedor de dados: 31
Autores: Sharma,   Rakesh Kumar; Sankhayan,   Prem Lall; Singh,   Ranveer.
Cropping pattern in the Himalayan region of India has undergone a significant change in the recent past. Introduction of horticultural crops of vegetables, fruits and flowers have led to more intensive agriculture. Such a change, resulting in higher incomes and improvements of the overall living conditions has, however, been accompanied with increased income risk. This emphasises a need for proper analysis of the cropping pattern, at an appropriate scale, such as, a micro watershed. This was achieved by constructing a dynamic non-linear programming model incorporating appropriate objective function, constraints and crop and livestock activity budgets along with risk component present in the gross returns. The model was then solved under alternate policy...
Tipo: Conference Paper or Presentation
Palavras-chave: Cropping pattern; Gross margins; Himachal Pradesh; Optimization; Covariance; Crop Production/Industries; Farm Management; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; C61; Q12; Q15.
Ano: 2009
URL: http://purl.umn.edu/51404

USING BEST WORST SCALING TO INVESTIGATE PERCEPTIONS OF CONTROL AND CONCERN OVER FOOD AND NON-FOOD RISKS
Provedor de dados: 31
Autores: Erdem,   Seda; Rigby,   Dan.
This research locates a series of risks or hazards within a framework characterized by the level of control respondents believe they have over the risks, and the level of worry the risks prompt. It does this for a set of both food and non-food risks. The means by which this is done is novel and differs from past risk perception analyses in that it asks people directly regarding their relative assessments of the levels of control and worry regarding the risks presented. The cognitive burden associated with people ranking and scaling items in large sets is notoriously heavy and so this study uses an elicitation method designed to make the process intuitive and cognitively manageable for respondents. The substantive analysis of the risk perceptions has 4 main...
Tipo: Conference Paper or Presentation
Palavras-chave: Best-worst scaling; Maximum Difference; Food; Risk; Perception; Novel Technology; E.coli; UK; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Risk and Uncertainty; Q18; Q51; D03; D12.
Ano: 2010
URL: http://purl.umn.edu/61518

Competition In or For the Field: Which Is Better?
Provedor de dados: 31
Autores: Engel,   Eduardo M.R.A.; Fischer,   Ronald; Galetovic,   Alexander.
In many circumstances, a principal, who wants prices to be as low as possible, must contract with agents who would like to charge the monopoly price. This paper compares a Demsetz auction, which awards an exclusive contract to the agent bidding the lowest price (competition for the field) with having two agents provide the good under (imperfectly) competitive conditions (competition in the field). We obtain a simple sufficient condition showing unambiguously which option is best. The condition depends only on the shapes of the surplus function of the principal and the profit function of agents, and is independent of the particular duopoly game played ex post. We apply this condition to three canonical examples-procurement, royalty contracts and...
Tipo: Working or Discussion Paper
Palavras-chave: Demsetz auction; Double marginalization; Franchising; Joint vs. separate auctions; Monopoly; Procurement; Dealerships; Royalty contracts; Research Methods/ Statistical Methods; D44; L12; L92.
Ano: 2002
URL: http://purl.umn.edu/28406

THE EFFECT OF ARMINGTON STRUCTURE ON WELFARE EVALUATIONS IN GLOBAL CGE-MODELS
Provedor de dados: 31
Autores: Kerkela,   Leena.
In this paper, the welfare results in trade liberalisation scenarios in global CGE models (like GTAP) are analysed. The default modeling strategy in trade is the Armington assumption with bilateral trade flows in industries. The negative terms of trade effects that often dominate the negative welfare outcome in simulation experiments are decomposed to imports and exports price effects. The numerical examples show that even in unilateral liberalisation with decreasing import tariffs, the welfare effects are dominated by domestic price level changes that also drive the exports prices. The numerical examples are built around simple GTAP tariff cut experiments with 3x3 country and commodity aggregation. The inherent feature in this type of models is that they...
Tipo: Conference Paper or Presentation
Palavras-chave: CGE Modeling; Trade liberalisation; Terms of trade; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6397

From the help desk: Seemingly unrelated regression with unbalanced equations
Provedor de dados: 31
Autores: McDowell,   Allen.
This article demonstrates how to estimate the parameters of a system of seemingly unrelated regressions when the equations are unbalanced, i.e., when the equations have an unequal number of observations. With estimators that require the data to be in wide format, such as Stata’s sureg, the equations must be balanced. Any additional observations that are available for some equations, but not for all, are discarded, potentially resulting in a loss of efficiency. Reshaping and scaling the data allows us to use Stata’s xtgee command to fit the model and obtain estimates utilizing all the available data. The resulting estimator is potentially more efficient when the equations are unbalanced.
Tipo: Journal Article
Palavras-chave: SUR; Seemingly unrelated regression; Unbalanced equations; Generalized estimating equations; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116272

Estimating a Demand System with Seasonally Differenced Data
Provedor de dados: 31
Autores: Harri,   Ardian; Brorsen,   B. Wade; Muhammad,   Andrew; Anderson,   John D.
Several recent papers have used annual changes and monthly data to estimate demand systems. Such use of overlapping data introduces a moving average error term. This paper shows how to obtain consistent and asymptotically efficient estimates of a demand system using seasonally differenced data. Monte Carlo simulations and an empirical application to the estimation of the U.S. meat demand are used to compare the proposed estimator with alternative estimators. Once the correct estimator is used, there is no advantage to using overlapping data in estimating a demand system.
Tipo: Journal Article
Palavras-chave: Autocorrelation; Demand system; Monte Carlo; Overlapping data; Seasonal differences; Agribusiness; Demand and Price Analysis; Financial Economics; Research Methods/ Statistical Methods; C13; Q11; Q13.
Ano: 2010
URL: http://purl.umn.edu/90679

Theoretical frameworks for a productivity and efficiency analysis of agricultural enterprises
Provedor de dados: 31
Autores: Lissitsa,   Alexej; Babitcheva,   Tamara.
Das Hauptziel des vorliegenden "Discussions Paper" ist es, den russischsprachigen Leser mit den theoretischen Grundlagen der Produktivitäts- und Effizienzanalyse der landwirtschaftlichen Unternehmen vertraut zu machen. In der russischsprachigen Literatur wurden und werden bis zu heutigem Zeitpunkt in der Regel bei der Analyse der Effizienz der Unternehmen, die Kennzahlen der Rentabilität verwendet, deren Bedeutungen nach den einzelnen Unternehmen oder ihren Gruppen verglichen werden. In dieser Arbeit erfolgt eine Darstellung der im englischsprachigem Raum weitverbreiteten Methoden zur Effizienz und Produktivitätsanalyse. Die Arbeit ist so aufgebaut, dass zuerst die Unterschiede zwischen der Produktivität und Effizienz aus theoretischen Sicht erklärt und...
Tipo: Working or Discussion Paper
Palavras-chave: Produktivität; Effizienz; Indexzahlentheorie; Malmquist; Törnkvist; Fisher Index; Productivity; Efficiency; Index Number Theory; Продуктивность; Эффективность; Теория индексов; Малмквист; Торнквист и Фишер индексы.; Agribusiness; Industrial Organization; Productivity Analysis; Research Methods/ Statistical Methods; B4; C6; D2; O3; O4.
Ano: 2003
URL: http://purl.umn.edu/92170

A FLEXIBLE METHOD FOR EMPIRICALLY ESTIMATING PROBABILITY FUNCTIONS
Provedor de dados: 31
Autores: Taylor,   C. Robert.
This paper presents a hyperbolic trigonometric (HT) transformation procedure for empirically estimating a cumulative probability distribution function (cdf), from which the probability density function (pdf) can be obtained by differentiation.  Maximum likelihood (ML) is the appropriate estimation technique, but a particularly appealing feature of the HT transformation as opposed to other zero-one transformations is that the transformed cdf can be fitted with ordinary least squares (OLS) regression.  Although OLS estimates are biased and inconsistent, they are usually very close to ML estimates; thus use of OLS estimates as starting values greatly facilitates use of numerical search procedures to obtain ML estimates.  ML estimates have desirable asymptotic...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/32377

Economic Efficiency of Smallholder Intensive Dairy Farms in Iran: Adjusted for Market Distortion
Provedor de dados: 31
Autores: Bakhshoodeh,   Mohamad; Shahnoushi,   Naser.
The dairy farmers in Iran are faced with milk price distortion due to the market imperfection. To measure an unbiased farm-specific efficiency, prices should be adjusted in an imperfect market. To examine this issue, a shadow-price profit frontier was applied to a sample of 860 Iranian small intensive dairy farms surveyed in 2005-06 in order to calculate profit efficiency of individual dairy farmers. This adjusted measure was then compared with that of unadjusted measure that assumes undistorted market. A multiple general linear model (GLM) technique was applied to the data to examine the multiple effects of pure-bred animals, and the used farm capacity on profit efficiency indices. The mean value of adjusted profit efficiency was 0.40, significantly...
Tipo: Conference Paper or Presentation
Palavras-chave: Profit efficiency; Dairy farms; Iran; Agribusiness; Livestock Production/Industries; Research Methods/ Statistical Methods; C31; N55; Q12.
Ano: 2009
URL: http://purl.umn.edu/52996

Asymmetric Intra-household Allocation of Calories in China: Implication for Demographic Bias and the Need for Demographic Targeting
Provedor de dados: 31
Autores: Shimokawa,   Satoru.
This article questions the assumption of symmetric consumption behavior in the conventional analysis of intra-household calorie allocation. It proposes a framework that takes into account asymmetric consumption behavior due to liquidity constraints or loss aversion. Using panel data from China, we find that intra-household calorie allocation responds asymmetrically to expected declines and increases in household food availability, which is qualitatively consistent with the liquidity constraint model. Clarifying such asymmetric responses enables us to relate calorie elasticity estimates to the status of demographic groups within a household without requiring a full interpretation of the ordering of the estimates across demographic groups. Results also show...
Tipo: Conference Paper or Presentation
Palavras-chave: Intra-household Allocation; Nutrition; Calorie; Targeting; China; Agricultural and Food Policy; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; International Development; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49115

Bayesian and Frequentist Approaches to Hedonic Modeling in a Geo-Statistical Framework
Provedor de dados: 31
Autores: Ghosh,   Gaurav S.; Carriazo,   Fernando.
We compare Least Squares, Maximum Likelihood and Bayesian approaches to estimation in a Hedonic context.  The approaches are compared from theoretical and practical perspectives and from the viewpoint of a policy maker or urban planner.  The approaches are applied to data on the property market in Bogota, Colombia.  We find that no approach is unambiguously better than the others and recommend that choice of estimation technique should be predicated upon the characteristics of the policy problem at hand.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/9916

A USER'S GUIDE TO SMALLP - VERSION 7.0 A MICRO-COMPUTER BASED MATHEMATICAL PROGRAMMING ALGORITHM
Provedor de dados: 31
Autores: Fuller,   Earl I.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/13499

Erratum and discussion of propensity–score reweighting
Provedor de dados: 31
Autores: Nichols,   Austin.
Tipo: Article
Palavras-chave: Xtreg; Psmatch2; Nnmatch; Ivreg; Ivreg2; Ivregress; Rd; Lpoly; Xtoverid; Ranktest; Causal inference; Match; Matching; Reweighting; Propensity score; Panel; Instrumental variables; Excluded instrument; Weak identification; Regression; Discontinuity; Local polynomial; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122619

MEASURING VULNERABILITY
Provedor de dados: 31
Autores: Ligon,   Ethan; Schechter,   Laura.
Traditional poverty measures neglect several important dimensions of household welfare.  In this paper we construct a measure of "vulnerability" which allows us to quantify the welfare loss associated with poverty as well as the loss associated with any of a variety of different sources of uncertainty.  Applying our measure to a panel dataset from Bulgaria in 1994, we find that poverty and risk play roughly equal roles in reducing welfare.  Aggregate shocks are more important than idiosyncratic sources of risk, but households headed by an employed, educated male are less vulnerable to aggregate shocks than are other households.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19899

Appendix: A Brief Review of the Literature by Subject Category; References; Epilogue
Provedor de dados: 31
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/95728

ANALYZING ENVIRONMENTAL POLICY WITH POLLUTION ABATEMENT VERSUS OUTPUT ANALYZING ENVIRONMENTAL REDUCTION: AN APPLICATION TO U.S. AGRICULTURE
Provedor de dados: 31
Autores: Schamel,   Guenter; de Gorter,   Harry.
A model is developed that derives optimal pollution levels and determines the welfare economics of pollution reduction, differentiating between abatement and output reduction. It is suitable to analyze alternative policy instruments aimed to reduce external costs of agricultural production. The model is applied to the U.S. corn sector and we simulate the effects of stylized environmental policies for pesticide use on social welfare and environmental quality. The simulation results indicate that across policy scenarios, fairly modest reductions in output may induce significant gains in social welfare and environmental quality.
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/6853

Institutions and Demographic Responses to Shocks: Wuttemberg, 1634-1870
Provedor de dados: 31
Autores: Guinnane,   Timothy W.; Ogilvie,   Sheilagh.
Simple Malthusian models remain an important tool for understanding pre-modern demographic systems and their connection to the economy. But most recent literature has lost sight of the institutional context for demographic behavior that lay at the heart of Malthus’s own analysis. This paper estimates a short-run version of a Malthusian model for two Württemberg communities from 1646 to 1870. Württemberg differed institutionally from the northwest European societies analyzed in previous studies. The impact of institutional differences shows clearly in differing demographic reactions to economic shocks. Mortality was less sensitive to shocks than one would expect, while nuptiality was especially sensitive.
Tipo: Working or Discussion Paper
Palavras-chave: Malthusian models; Mortality; Fertility; Nuptiality; Guilds; Institutional and Behavioral Economics; Labor and Human Capital; Research Methods/ Statistical Methods; N33; J10.
Ano: 2008
URL: http://purl.umn.edu/5977

Governance Stucture, Perception and Innovation in Credence Food Transactions: The Role of Food Community Networks
Provedor de dados: 31
Autores: Pscucci,   Stefano.
Governance Stucture, Perception and Innovation in Credence Food Transactions: The Role of Food Community Networks
Tipo: Journal Article
Palavras-chave: Credence food; Food community network; Leisure; Involvement; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/97026

Quantitative Analysis of the Impact of Agricultural Management Strategies on Environmental Indicators
Provedor de dados: 31
Autores: Heigh,   Lori; Junkins,   Bruce.
This study uses an integrated economic-environmental modeling system to provide quantitative estimates that were used in the process of setting provincial environmental outcome targets under the APF. The analysis represents a joint effort of the Department's physical scientists, economists and policy analysts. This approach provides the ability to model the impacts of agricultural production and the adoption of Beneficial Management Practices (BMPs) on the Canadian environment. The analysis quantifies the impacts of various management practices on air, soil, and water quality as well as biodiversity through measurable and meaningful indicators. It also assists in identifying appropriate environmental goals by providing an indication of achievable outcomes...
Tipo: Report
Palavras-chave: Sustainability of agriculture; Agricultural policy; Environmental issues; Social issues; Environmental outcome targets; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/53905

Review of An Introduction to Stata for Health Researchers by Juul
Provedor de dados: 31
Autores: Carlin,   John B.
Tipo: Article
Palavras-chave: Learning Stata; Introductory biostatistics; Epidemiological statistics; Health sciences; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119246

Maximum Empirical Likelihood: Empty Set Problem
Provedor de dados: 31
Autores: Grendar,   Marian; Judge,   George G.
In the Empirical Estimating Equations (E^3) approach to estimation and inference estimating equations are replaced by their data-dependent empirical counterparts. It is odd but with E^3 there are models where the E^3-based estimator does not exist for some data set, and does exist for others. This depends on whether or not a set of data-supported probability mass functions that satisfy the empirical estimating equations is empty for the data set. In a finite sample context, this unnoted feature invalidates methods of estimation and inference, such as the Maximum Empirical Likelihood, that operate within E^3. The empty set problem of E^3 is illustrated by several examples and possible remedies are discussed.
Tipo: Working or Discussion Paper
Palavras-chave: Statistical theory; Statistics; Mathematical analysis; Mathematical statistic; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53402

A HEURISTIC FIXED-CHARGE QUADRATIC ALGORITHM
Provedor de dados: 31
Autores: Roe,   Terry L.; Shane,   Mathew.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/13466

Sustaining Small and Medium Enterprises through Financial Service Utilization: Does Financial Literacy Matter?
Provedor de dados: 31
Autores: Nunoo,   Jacob; Andoh,   Francis K.
Promoting a dynamic operating environment for Small Medium scale enterprises (SMEs) is seen as a priority amongst economic development goals, in both developed and emerging economies. SMEs are a primary driver for job creation and GDP growth. They greatly contribute to economic diversification and social stability and they play an important role for private sector development.  It must be emphasized, that the utilization of these financial products does not only promote the growth of the SMEs themselves but also their active participation in the financial services market leads to financial development which is widely recognized as an important determinant of economic growth and also recognized as important for enhancing the social and economic impact of...
Tipo: Presentation
Palavras-chave: Small and medium scale enterprises; Financial literacy; Utilization; Agricultural Finance; Financial Economics; Research Methods/ Statistical Methods; Q14; M20.
Ano: 2011
URL: http://purl.umn.edu/123418

TESTING HYPOTHESIS ON THE RELATIVE SIZE OF THE COEFFICIENTS IN REGRESSION MODELS
Provedor de dados: 31
Autores: Mann,   Jitendar S.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1969
URL: http://purl.umn.edu/14225

Consumption of Pork Products: Now and to the Year 2020
Provedor de dados: 31
Autores: Lin,   Biing-Hwan; Davis,   Christopher G.; Yen,   Steven T.
Data from the U.S. Department of Agriculture’s 1994-96 and 1998 Continuing Survey of Food Intakes by Individuals (CSFII) are used to describe pork consumption patterns as well as to estimate a censored demand system for pork cuts. The descriptive analysis fills the void about basic information on who consumes pork, how much, and where. A censored system of four pork cuts is estimated for adults, using a maximum-likelihood procedure. The estimated system is used to predict consumption of pork products by adults through the year 2020.
Tipo: Journal Article
Palavras-chave: Censored dependent variables; CSFII; Pork consumption; Tobit system; Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/59403

LEAST COST EFFICIENCY OF AGRICULTURAL PROGRAMS: AN EMPIRICAL INVESTIGATION
Provedor de dados: 31
Autores: Salhofer,   Klaus; Schneider,   Friedrich; Streicher,   Gerhard.
The study evaluates the efficiency of government intervention using a vertical structured model including imperfectly competitive agricultural input markets, the bread grains market, and the imperfectly competitive food industry. The actually observed policy is compared to a hypothetical optimal policy of the same policy instruments to test for policy efficiency.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21565

VISIBLE CHOICE SETS AND SCOPE SENSITIVITY IN CONTINGENT VALUES
Provedor de dados: 31
Autores: Bateman,   Ian J.; Cole,   Matthew A.; Cooper,   P.; Georgiou,   Stavros; Hadley,   David; Poe,   Gregory L.
Through a combination of experimental and field analysis, we demonstrate that varying the visible choice set (i.e.,  set of goods which, at any given point in a valuation exercise, the respondent perceives as being the full extent of purchase options which will be made available in the course of that exercise) strongly affects observed scope.  These results challenge the conclusion that contingent values are plagued by embedding and ordering effects, suggesting that such effects can be eliminated when the respondent is completely informed about the entirety of valuation tasks prior to answering the first elicitation question.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/20480

An Analysis of Rank Ordered Data
Provedor de dados: 31
Autores: Paudel,   Krishna P.; Poudel,   Biswo N.; Dunn,   Michael A.; Pandit,   Mahesh.
Many methods are available to analyze rank ordered data. We used a spectral density method to analyze Formosan subterranean termite control options ranked by Louisiana homeowners. Respondents are asked to rank termite control options from the most preferred to the least preferred option. Spectral analysis results indicated that the most preferred termite control choice is a relatively cheap ($0.13 per square foot) option of liquid treatment.
Tipo: Conference Paper or Presentation
Palavras-chave: FST; Rank ordered data; Spectral analysis; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49518

The impact of property rates on agricultural land, focusing on the Eastern Cape
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005. This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the other...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58095

Information Theoretic Estimators of the  First-Order Spatial Autoregressive Model
Provedor de dados: 31
Autores: Perevodchikov,   Evgeniy V.
Information theoretic estimators for the first-order autoregressive model are considered. Extensive Monte Carlo experiments are used to compare finite sample performance of traditional and three information theoretic estimators including maximum empirical likelihood, maximum empirical exponential likelihood, and maximum log Euclidean likelihood. It is found that information theoretic estimators are robust to specification of spatial autocorrelation and dominate traditional estimators in finite samples. Finally, the proposed estimators are applied to an illustrative example of hedonic housing pricing.
Tipo: Working or Discussion Paper
Palavras-chave: Information theoretic estimators; The first-order spatial autoregressive model; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49491

Evaluating concavity for production and cost functions
Provedor de dados: 31
Autores: Baum,   Christopher F.; Linz,   Teresa.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122709

Introducing Imperfect Competition in CGE Models: Technical Aspects and Implications
Provedor de dados: 31
Autores: Roson,   Roberto.
This paper considers the technical aspects and the consequences, in terms of simulation results and policy assessment, of introducing imperfect competition in a CGE model. The modifications to the standard CGE framework needed to model imperfect competition in some industries are briefly discussed. Next, the paper discusses whether, how much and why, those changes may affect the qualitative output of a typical simulation experiment. It is argued that technical choices made in designing the model structure may have a significant impact on the model behavior. This is especially evident when the output of the model, under an imperfect competition closure, is compared with that obtained under a standard closure, assuming perfect competition. As an...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/12061

Empirical properties of duality theory
Provedor de dados: 31
Autores: Lusk,   Jayson L.; Featherstone,   Allen M.; Marsh,   Thomas L.; Abdulkadri,   Abdullahi O.
This research examines selected empirical properties of duality relationships. Monte Carlo experiments indicate that Hessian matrices estimated from the normalised unrestricted profit, restricted profit and production functions yield conflicting results in the presence of measurement error and low relative price variability. In particular, small amounts of measurement error in quantity variables can translate into large errors in uncompensated estimates calculated via restricted and unrestricted profit and production functions. These results emphasise the need for high quality data when estimating empirical models in order to accurately determine dual relationships implied by economic theory.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/118069

Multiple site demand models. Part II: Review of existing models and development of new models
Provedor de dados: 31
Autores: Hanemann,   W. Michael.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1984
URL: http://purl.umn.edu/6208

MODELLING THE MARKET OUTLOOK AND POLICY ALTERNATIVES FOR THE WHEAT SECTOR IN SOUTH AFRICA
Provedor de dados: 31
Autores: Meyer,   Ferdinand H.; Kirsten,   Johann F.; Poonyth,   Daneswar.
In this study, the structure of the South African wheat market is analysed using economic theory and econometric modelling techniques. The developed model is used to make baseline projections regarding the supply and use of wheat in South Africa and to analyse the impacts of various policy alternatives on the wheat sector for the period 2002 – 2008. Results indicate that after an initial decline in the area harvested in 2003, the area harvested will increase over time. Domestic consumption will gradually decrease over time, which will result in lower levels of imports and higher level of exports. Three policy scenarios are analysed, the elimination of the import tariff for wheat, a twelve percent depreciation in the exchange rate, and the convergence of...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/19096

G-estimation of causal effects, allowing for time-varying confounding
Provedor de dados: 31
Autores: Sterne,   Jonathan A.C.; Tilling,   Kate.
This article describes the stgest command, which implements G-estimation (as proposed by Robins) to estimate the effect of a time-varying exposure on survival time, allowing for time-varying confounders.
Tipo: Journal Article
Palavras-chave: G-estimation; Time-varying confounding; Survival analysis; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115959

Stata tip 64: Cleaning up user-entered string variables
Provedor de dados: 31
Autores: Herrin,   Jeph; Poen,   Eva.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122605

EMPIRICAL SUCCESS RATIOS IN USDA AGRICULTURAL UTILIZATION RESEARCH
Provedor de dados: 31
Autores: Jones,   Harold B., Jr.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/29519

Approximating optimal numerical solutions to bio-economic systems: How useful is simulation-optimization?
Provedor de dados: 31
Autores: Börner,   Jan; Higgins,   Steven Ian; Scheiter,   Simon; Kantelhardt,   Jochen.
For applications in agricultural economics, complex ecological systems are often oversimplified to the extent that ecologists rarely consider model results valid. Recursive optimization of complex systems represents an alternative, but requires strong assumptions regarding time preference and uncertainty. In this paper we explore the implications of merely approximating “true” optima of complex dynamic optimization problems using a technique called simulation-optimization. We develop a standard discrete renewable resource use problem and solve it numerically using both simulation-optimization and non-linear mathematical programming. We subsequently introduce non-linearity and uncertainty and graphically compare the performance of simulation-optimization...
Tipo: Conference Paper or Presentation
Palavras-chave: Optimal control; Simulation; Ecological economic systems; Interdisciplinary modeling; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/51407

THE OPERATION OF THE HUNGARIAN BROILER PRODUCT CHAIN
Provedor de dados: 31
Autores: Szollosi,   Laszlo.
The general objective of this paper is to present the inner connections of the broiler product chain and the process of value generation in the economic situation of 2007. I introduce the input-output model of the broiler product chain adapted from macro-economic analysis, in which I calculated the direct connections of the product chain phases and between the national economic branches outside the chain. Then I point to the disproportion of the product chain through the profit distribution. Moreover, to evaluate the process of the value generation I demonstrate the value added generated along the value chain (year 2007). On the basis of the results 825 EUR of value added is realized to one ton of ready product (chicken meat), from which the major portion...
Tipo: Journal Article
Palavras-chave: Broiler; Product chain; Input-output model; Value generation; Value added; Agricultural and Food Policy; Livestock Production/Industries; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/53566

Optimal Information Acquisition under a Geostatistical Model
Provedor de dados: 31
Autores: Pautsch,   Gregory R.; Babcock,   Bruce A.; Breidt,   F. Jay.
Studies examining the value of switching to a variable rate technologies (VRT) fertilizer program assume producers possess perfect soil nitrate information. In reality, producers estimate soil nitrate levels with soil sampling. The value of switching to a VRT program depends on the quality of the estimates and on how the estimates are used. Larger sample sizes, increased spatial correlation, and decreased variability improve the estimates and increase returns. Fertilizing strictly to the estimated field map fails to account for estimation risk. Returns increase if the soil sample information is used in a Bayesian fashion to update the soil nitrate beliefs in non-sampled sites.
Tipo: Conference Paper or Presentation
Palavras-chave: Estimation risk; Geostatistics; Nitrogen fertilizer; Optimal sample sizes; Precision farming; Single rate technology; Variable rate technology; Variogram; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/18358

Current policy and status of DDT use for malaria control in Ethiopia, Uganda, Kenya and South Africa.
Provedor de dados: 31
Autores: Biscoe,   Melanie L.; Mutero,   Clifford M.; Kramer,   Randall A.
Tipo: Working or Discussion Paper
Palavras-chave: Malaria; Waterborne diseases; Disease vectors; Public health; Policy; Ddt; Legal aspects; Pesticide residues; Case studies; Health Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2005
URL: http://purl.umn.edu/92015

A Comparison of Historic and Implied Volatility for Predicting Agricultural Option Premiums
Provedor de dados: 31
Autores: Haeberle,   Carlos G.; Kahl,   Kandice H.; Curtis,   Charles E., Jr.
Tipo: Journal Article
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/60384

Characteristics of Price Fluctuation of Agricultural Products in China
Provedor de dados: 31
Autores: Guo,   Xiao-hui; Ge,   Dang-qiao.
This paper introduces the basic trend of the price of agricultural products in China, and analyzes the causation of rigid rise of agricultural product price. We also study on the fluctuation characteristics of the prices of Chinese and classification agricultural products.
Tipo: Thesis or Dissertation
Palavras-chave: Agricultural product price; Fluctuation characteristics; Trend; China; Agricultural and Food Policy; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53515

ECONOMIES OF THROUGHPUT AND TRANSPORT BOTTLENECKS IN GRAIN DISTRIBUTION SYSTEMS
Provedor de dados: 31
Autores: Brennan,   Donna C.
In this paper, a model is presented which shows the relationship between country grain storage costs and transport bottlenecks that exist in the harvest period. It is shown that transport bottlenecks limit the amount of grain that can be transported from receival points in the peak receival period. This constraint means that the cost of operating country receival points is high because the turnover of storage capacity is limited. However, system costs can be reduced by focusing the peak transport task at sites that are less intensive users of scare transport capacity. This allows more grain to be transported out of the system in the peak period, decreasing the need for costly long term storage at country sites.  In the longer term, differences in the...
Tipo: Journal Article
Palavras-chave: Public Economics; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/22734

Non-Uniqueness of Equilibria in One-Shot Games of Strategic Communication
Provedor de dados: 31
Autores: Valsecchi,   Irene.
The paper shows that Perfect Bayesian equilibria need not be unique in the strategic communication game of Crawford and Sobel (1982). First, different equilibrium partitions of the state space can have equal cardinality, despite fixed prior beliefs. Hence, there can be different equilibrium action profiles with the same size. Second, provided a Perfect Bayesian equilibrium exists, different message rules and beliefs can hold in other equilibria inducing the same action profile.
Tipo: Working or Discussion Paper
Palavras-chave: Sender-Receiver Games; Strategic Information Transmission; Research Methods/ Statistical Methods; D83.
Ano: 2009
URL: http://purl.umn.edu/50404

Initial Endowment Effects in Multi-Unit Vickrey Auctions
Provedor de dados: 31
Autores: Akaichi,   Faiçal; Nayga,   Rodolfo M., Jr.; Gil,   Jose Maria.
We report the result of experiments designed to assess the effect of initial endowments on willingness to pay values elicited from multi-unit Vickrey auctions.  Comparing bids from an “endow and upgrade” approach with the “full bidding” approach, we find that the direction of the endowment effect generally depends on the number of endowed units of the conventional product that subjects are willing to give up in exchange for units of the upgraded product. The endowment effect is “reverse” when the number of units that participants are willing to give up is lower or equal to the number of remaining endowed units. However, we generally find an endowment effect when the number of units a participant is willing to give up is higher than the number of remaining...
Tipo: Conference Paper or Presentation
Palavras-chave: Endowment effect; Number of units of the endowed product; Multi-unit Vickrey auctions.; Agribusiness; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession; C91; D12; D44.
Ano: 2011
URL: http://purl.umn.edu/103041

Comparison of Complete Combinatorial and Likelihood Ratio Tests: Empirical Findings from Residential Choice Experiments
Provedor de dados: 31
Autores: Ohdoko,   Taro.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6139

Estimating irrigation farm production functions using ABARES irrigation survey data
Provedor de dados: 31
Autores: Hughes,   Neal.
The ABARE (now ABARES) survey of irrigation farms in the Murray–Darling Basin began in 2006–07 and provides a comprehensive farm-level panel dataset, which, to date, has seen limited econometric analysis (Ashton et al. 2009). At present, three complete years of irrigation survey data are available: 2006–07, 2007–08 and 2008–09. In each year, approximately 850 farms are sampled. As with the ABARES broadacre surveys, the irrigation survey is a rotating (unbalanced) panel dataset. This study makes use of the irrigation survey data to estimate production functions at both the farm and enterprise (crop/livestock activity) level. In addition to the traditional categories of input use (land, labour, capital and materials), the study incorporates measures of water...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/100564

A KOLOZS MEGYEI VIDÉKI MAGYAR FIATALOK PÁLYAVÁLASZTÁSA
Provedor de dados: 31
Autores: Kerekes,   Kinga.
Individual expectations of the rural young people regarding their future have a great impact on the survival and economical development of the Hungarian rural communities from Romania. This paper tries to answer questions such as: will young ethnic Hungarians facing the first and decisive step in their life regarding their career continue education? What professions will they choose? Where will they look for employment and settle down?  Statistical data show that people living in rural areas are less educated than those from the urban areas. People with low education face more difficulties in finding employment and also earn less  than the better educated ones, therefore it is very important for rural young people to continue education. As continuing...
Tipo: Book
Palavras-chave: Erdély; Pályaválasztás; Továbbtanulás; Vidéki közösségek fejlődése; Transylvania; Choice of profession; Further education; Develpoment of rural communities; Agricultural and Food Policy; Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43410

Review of Generalized Linear Models and Extensions by Hardin and Hilbe
Provedor de dados: 31
Autores: Newson,   Roger.
This article reviews Generalized Linear Models and Extensions by Hardin and Hilbe.
Tipo: Journal Article
Palavras-chave: Generalized linear models; Book review; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115939

MULTIDIMENSIONAL OUTPUT INDICES
Provedor de dados: 31
Autores: Craig,   Barbara J.; Pardey,   Philip G.
This abstract describes alternative output aggregates that provide both cross-sectional and temporal comparisons appropriate for the analysis of panel data sets. Several of these multidimensional output indices are constructed using detailed data on agricultural production to illustrate the effects of fixing price weights over time, employing sample average price weights, and choosing between alternative approximations of Divisia indices.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/13828

SUBJECTIVE DISTRIBUTIONS AS ECONOMETRIC RESPONSE DATA
Provedor de dados: 31
Autores: Griffiths,   William E.; Anderson,   Jock R.; Hamal,   K.B.
Analysis of actual observations of response processes is a routine procedure in applied econometrics but methods of dealing with purely subjective probability distributions as response 'data' have seemingly not hitherto been worked out. The models and methods developed here go some way to filling this void. They are illustrated by using information from a cross-sectional study of sixty Nepalese small-scale farmers. Means and variances of subjective probability distributions for rice paddy yields under different technologies are related to controlled inputs, such as fertiliser levels, and to relevant socio-economic aspects of farmers themselves, such as technological knowledge and farm size.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/22451

Indicators
Provedor de dados: 31
Autores: Andrews,   Margaret S.; Nord,   Mark.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/122158

THE IMPORTANCE  OF FUNCTIONAL FORM IN THE ESTIMATION OF WELFARE
Provedor de dados: 31
Autores: Kling,   Catherine L.
Researchers have recognized the central role that the choice of functional form has on estimated of consumer surplus.  The purpose of this paper is to quantify the magnitude of errors which might arise from the use of incorrect functional forms.  It describes a simulation experiment where estimated consumer surplus, based on simulated data sets, is compared with consumer surplus computed directly from the simulate data.  The errors resulting from the use of mismatching functional forms range from approximately 4% to 107%.
Tipo: Journal Article
Palavras-chave: Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/32452

Programación de la comercialización mensual agraria: el caso de los cultivos hortícolas en la provincia de Almería
Provedor de dados: 31
Autores: Perez-Mesa,   Juan Carlos.
RESUMEN: Este artículo trata sobre la programación de la producción agraria, entendida no sólo como la selección entre varios cultivos sino, también, como la distribución temporal de los mismos. Primero se estudia la programación de la producción para una empresa, donde sus decisiones no afectan a los precios de equilibrio en el mercado: en este caso se propone la utilización de un modelo de Markowitz adaptado a la programación temporal de la comercialización. Posteriormente, se analiza la ordenación de la venta para un operador que tuviese capacidad, por su volumen de comercialización, de alterar el equilibrio de mercado: en este caso se propone la utilización de un modelo de maximización mensual de ingresos y márgenes.  SUMMARY: This article analyses the...
Tipo: Journal Article
Palavras-chave: Exportación; Optimización; Planificación; Programación matemática; Optimization; Planning; Mathematical programming; Export; Community/Rural/Urban Development; International Relations/Trade; Research Methods/ Statistical Methods; C61; Q13.
Ano: 2008
URL: http://purl.umn.edu/37187

Why Value Estimates Generated Using Choice Modelling Exceed Contingent Valuation: Further Experimental Evidence
Provedor de dados: 31
Autores: Boyle,   Kevin J.; Morrison,   Mark; Taylor,   Laura O.
Choice modelling is increasingly being used to generate estimates of the value of changes in environmental quality. This is partly because of the informational efficiencies of the technique, but also because of concern about the accuracy of contingent valuation. Experimental evidence has, however, demonstrated that choice modelling tends to produce much higher valuation estimates than contingent valuation. One possible explanation for the divergence between choice modelling and contingent valuation estimates is the lack of incentive compatibility with the former technique. This potentially has several sources, including having no provision rule (eg a referendum), respondents choosing between more than two alternatives, and repeated choices. We report on...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/58370

Designing choice experiments to incorporate tests for geographic scale and scope differences
Provedor de dados: 31
Autores: Rolfe,   John; Windle,   Jill; Bennett,   Jeffrey W.
Designing a choice modelling (CM) experiment to place a value on increasing protection of the Great Barrier Reef (GBR) raises complex issues. The size and diversity of the GBR, and the number of different pressures impacting on it, mean protection and improvement scenarios can be drafted in several different ways. This report discusses some of the considerations in selecting, describing and combining choice attributes. It also looks at how to incorporate tests for geographic scale (size) and scope (complexity) differences into the design of the CM survey instrument. The potential to include information about management options designed to achieve increased protection, and the associated risk and uncertainty, is also discussed.
Tipo: Report
Palavras-chave: Choice modelling; Scale; Scope; Coral reef; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/94802

Multiple site demand models. Part 1: Some preliminary considerations
Provedor de dados: 31
Autores: Hanemann,   W. Michael.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1984
URL: http://purl.umn.edu/6189

Economic Consequences of Pollinator Declines: A Synthesis
Provedor de dados: 31
Autores: Bauer,   Dana Marie; Sue Wing,   Ian.
This paper surveys the literature on pollinator declines and related concerns regarding global food security. Methods for valuing the economic risks associated with pollinator declines are also reviewed. A computable general equilibrium (CGE) approach is introduced to assess the effects of a global catastrophic loss of pollinators. There appears to be evidence supporting a trend towards future pollinator shortages in the United States and other regions of the world. Results from the CGE model show economic risks to both direct crop sectors and indirect non-crop sectors in the economy, with some amount of regional heterogeneity.
Tipo: Journal Article
Palavras-chave: Ecosystem services; Pollinators; Food security; Valuation; Computable general equilibrium modeling; Environmental Economics and Policy; Food Security and Poverty; International Relations/Trade; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/95903

Analysis of Cardinal and Ordinal Assumptions in Conjoint Analysis
Provedor de dados: 31
Autores: Harrison,   R. Wes; Gillespie,   Jeffrey M.; Fields,   Deacue.
Of twenty-three agricultural economics conjoint analyses conducted between 1990 and 2001, seventeen used interval-rating scales, with estimation procedures varying widely. This study tests cardinality assumptions in conjoint analysis when interval-rating scales are used, and tests whether the ordered probit or two-limit tobit model is the most valid. Results indicate that cardinality assumptions are invalid, but estimates of the underlying utility scale for the two models do not differ. Thus, while the ordered probit model is theoretically more appealing, the two-limit tobit model may be more useful in practice, especially in cases with limited degrees of freedom, such as with individual-level conjoint models.
Tipo: Journal Article
Palavras-chave: Ordered probit; Two-limit probit; Conjoint analysis; Cardinality; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/10238

Calibrating Online Survey Sample for Economic Impact Analysis
Provedor de dados: 31
Autores: Devkota,   Nirmala; Paudel,   Krishna P.; Fannin,   James Matthew; Hall,   Larry M.; Caffey,   Rex H.
Online surveys have emerged as low-cost data collection approach in empirical researches; however, the validity of data remains questionable. Therefore, we employed a stochastic frontier estimation method to calibrate online recreational expenditure. Study results suggested the presence of inefficiency on online surveys. Analysis was extended to estimate economic impact of nature based recreation on a local economy.
Tipo: Conference Paper or Presentation
Palavras-chave: Calibration; Online survey; Onsite survey; Stochastic frontier approach; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/34997

To Target or Not to Target? The cost efficiency of indicator-based targeting
Provedor de dados: 31
Autores: Houssou,   Nazaire; Zeller,   Manfred.
This paper assesses the cost efficiency of indicator-based targeting. Using household survey data from Malawi, we examine whether an indicator-based targeting of the poor is more target- and cost-efficient than the currently used mechanisms for targeting agricultural subsidy programs in the country.  There is compelling evidence in favor of targeting Malawi’s poor based on the newly developed system. An indicator-based targeting system appears to be more target- and cost-efficient than the 2000/01 Starter Pack and the 2006/07 Agricultural Input Subsidy Program (AISP). While the Starter Pack and the AISP transferred about 50% of total transfer, under an indicator-based system, about 73% of transfers are delivered to the poor. Likewise, under an...
Tipo: Conference Paper or Presentation
Palavras-chave: Malawi; Poverty targeting; Validation tests; Cost efficiency; Development policy; Agricultural and Food Policy; Community/Rural/Urban Development; Food Security and Poverty; Political Economy; Research Methods/ Statistical Methods; C01; C13; I32.
Ano: 2010
URL: http://purl.umn.edu/61007

BROADENING THE CONCEPT AND MEASUREMENTS OF EXISTENCE VALUE
Provedor de dados: 31
Autores: Loomis,   John B.
Recent efforts to refine the concept of existence value and to empirically measure it has led to an unnecessary narrowing of the concept of existence value.  This paper uses the literature on public goods to argue that existence value is a much broader concept than proposed by several authors.  Two commonly used but different empirical approaches to measuring existence values are compared and shown to lead to statistically different decompositions of total value between use and existence categories.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/29068

Discrete choice models, which one performs better?
Provedor de dados: 31
Autores: Gallardo,   Rosa Karina; Chang,   Jae Bong.
For over the last thirty years the multinomial logit model has been the standard in choice modeling.  Development in econometrics and computational algorithms has led to the increasing tendency to opt for more flexible models able to depict more realistically choice behavior.  This study compares three discrete choice models, the standard multinomial logit, the error components logit, and the random parameters logit.  Data were obtained from two choice experiments conducted to investigate consumers’ preferences for fresh pears receiving several postharvest treatments. Model comparisons consisted of in-sample and holdout sample evaluations.  Results show that product characteristics hence, datasets, influence model performance. We also found that the...
Tipo: Conference Paper or Presentation
Palavras-chave: Multinomial logit model; Error components; Random parameters; Discrete choice; Research Methods/ Statistical Methods; C25; D12.
Ano: 2010
URL: http://purl.umn.edu/61483

Compétitivité de la filière anacarde au Bénin: une analyse des effets aux prix de référence
Provedor de dados: 31
Autores: Oloukoi,   L.; Adegbola,   Patrice Ygue.
La politique agricole du Bénin connaît depuis quelques années, de profonds changements. En effet, les différentes imperfections du marché et les risques liés à la monoculture ont amené l’Etat à opter pour une diversification agricole. Ainsi, neuf (09) filières dont la filière anacarde sont identifiées comme prioritaires. Cette étude utilise la Matrice d’Analyse des Politiques (MAP) pour évaluer la compétitivité des différents segments de la filière anacarde au Bénin. A cet effet, une enquête quantitative est menée auprès des différents acteurs à savoir 198 producteurs, 61 commerçants et 7 transformateurs. Les résultats issus de l’étude montrent que les systèmes de production, de commercialisation et de transformation de la filière sont tous compétitifs....
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Labor and Human Capital; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/51998

An Analysis of the Pricing of Traits in the U.S. Corn Seed Market
Provedor de dados: 31
Autores: Shi,   Guanming; Chavas,   Jean-Paul; Stiegert,   Kyle W.
This paper investigates the pricing of patented traits in the U.S. hybrid corn seed market under imperfect competition. In a multiproduct context, we first examine how substitution/complementarity relationships among products can affect pricing. This is used to motivate multi-product generalizations of the Herfindahl-Hirschman index (GHHI) capturing cross-market effects of imperfect competition on bundle pricing. The GHHI model is applied to pricing of conventional and patented biotech seeds in the US from 2000-2007. One major finding is that standard component pricing in biotech traits is soundly rejected in favor of subadditive bundle pricing. The econometric estimates show how changes in market structures (as measured by both own- and cross-Herfindahl...
Tipo: Working or Discussion Paper
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/92249

Micro-level Studies and Policy Analysis: Experiences from Tonga and South Kalimantan
Provedor de dados: 31
Autores: Delforce,   Julie C.; Potter,   Lesley M.
Policy-oriented studies at the household and village level are undertaken by researchers from a range of disciplines. In this paper, we focus on two such studies, one conducted in Tonga by agricultural economists, the other in Indonesia by a geographer. While there are differences in disciplinary approach, some fundamental requirements emerge for the successful integration of micro-level research into the policy making process.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/9590

INTERPRETATIONS AND TRANSFORMATIONS OF SCALE FOR THE PRATT-ARROW ABSOLUTE RISK AVERSION COEFFICIENT:  IMPLICATIONS FOR GENERALIZED STOCHASTIC DOMINANCE:  COMMENT
Provedor de dados: 31
Autores: McCarl,   Bruce A.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1987
URL: http://purl.umn.edu/32224

CHOICE OF FLEXIBLE FUNCTIONAL FORMS:  REVIEW AND APPRAISAL
Provedor de dados: 31
Autores: Thompson,   Gary D.
Choice between alternative flexible functional forms has received little explicit treatment in many empirical agricultural studies. Theoretical criteria and empirical techniques for choosing between flexible functional forms are reviewed. Theoretical topics include definitions of flexibility, mathematical expansions, separability, and regular regions. Empirical techniques examined are Monte Carlo analysis, parametric modeling, bayesian inference, and nonnested hypothesis testing. Comparison of the full range of theoretical and empirical aspects may provide more credible and reliable empirical estimates when consumer or producer duality assumptions are appropriate in agricultural applications.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/32127

Using Biomedical Technologies to Inform Economic Modeling: Challenges and Opportunities for Improving Analysis of Environmental Policies
Provedor de dados: 31
Autores: Roe,   Brian E.; Haab,   Timothy C.
Advances in biomedical technology have irrevocably jarred open the black box of human decision making, offering social scientists the potential to validate, reject, refine and redefine the individual models of resource allocation that form the foundation of modern economics.  In this paper we (1) provide a comprehensive overview of the biomedical methods that may be harnessed by economists and other social scientists to better understand the economic decision making process; (2) review research that utilizes these biomedical methods to illuminate fundamental aspects of the decision making process; and (3) summarize evidence from this literature concerning the basic tenants of neoclassical utility that are often invoked for positive welfare analysis of...
Tipo: Conference Paper or Presentation
Palavras-chave: Neuroeconomics; Neuroscience; Brain imaging; Genetics; Welfare economics; Utility theory; Biology; Decision making; Preferences; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; D01; D03; D6; D87.
Ano: 2009
URL: http://purl.umn.edu/49151

LINKING CROSS-COMPLIANCE AND AGRI-ENVIRONMENTAL SCHEMES: A CASE STUDY IN EMILIA ROMAGNA
Provedor de dados: 31
Autores: Bartolini,   Fabio; Gallerani,   Vittorio; Raggi,   Meri; Viaggi,   Davide.
Agri-environmental schemes (AES) have been studied under different perspectives in Europe, since the beginning of the ‘90s. Under regulation 1698/2005, agri-environmental schemes design has been modified with a more clear identification of a baseline for identifying the commitments and the costs of these prescriptions. The link between cross-compliance and agri-environmental schemes can be interpreted as a problem of joint design by the decision maker. From the farmer’s point of view, private costs of participations in agri-environmental schemes shall be added to the cost to be compliant with the mandatory standard defined for each measure if they are not already implemented. This amount of costs arise when mandatory standard are required in the whole...
Tipo: Conference Paper or Presentation
Palavras-chave: Agri-Environmental Schemes; Cross Compliance; Farmers’ Behaviour Modelling; Moral Hazard; Agricultural and Food Policy; Consumer/Household Economics; Research Methods/ Statistical Methods; Q10; Q18.
Ano: 2008
URL: http://purl.umn.edu/44800

An Extension of the Blinder-Oaxaca Decomposition Technique to Logit and Probit Models
Provedor de dados: 31
Autores: Fairlie,   Robert W.
The Blinder-Oaxaca decomposition technique is widely used to identify and quantify the separate contributions of group differences in measurable characteristics, such as education, experience, marital status, and geographical differences to racial and gender gaps in outcomes. The technique cannot be used directly, however, if the outcome is binary and the coefficients are from a logit or probit model. I describe a relatively simple method of performing a decomposition that uses estimates from a logit or probit model. Expanding on the original application of the technique in Fairlie (1999), I provide a more thorough discussion of how to apply the technique, an analysis of the sensitivity of the decomposition estimates to different parameters, and the...
Tipo: Working or Discussion Paper
Palavras-chave: Logit; Probit; Decomposition; Race; Gender; Discrimination; Research Methods/ Statistical Methods; C8; J7.
Ano: 2003
URL: http://purl.umn.edu/28425

A shortcut through long loops: An illustration of two alternatives to looping over observations
Provedor de dados: 31
Autores: Vanlaar,   Ward.
It is well known that looping over observations can be slow and should be avoided. The objective of this article is to discuss two alternative solutions to looping over observations that can be used to overcome a particular data-management problem of merging datasets in which unique key identifiers changed over time. The first alternative, mapch, which is introduced in this article, uses a combination of appending, indexing, and merging to solve the problem, while the second alternative uses repeated merging. Both solutions are much quicker than looping over observations. However, depending on the nature of the problem, one solution may work better than the other. It is argued that the use of such dataset-type manipulations may be suitable to overcome...
Tipo: Article
Palavras-chave: Mapch; Appending; Data management; Indexing; Looping; Merging; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122620

AN OPTIMAL MANAGEMENT MODEL FOR INTENSIVE AQUACULTURE - AN APPLICATION IN ATLANTIC SALMON
Provedor de dados: 31
Autores: Hean,   Robyn L.
In this paper the optimal management strategy for intensive aquaculture is viewed in terms of a combined strategy of releasing the optimal number of recruits and harvesting those recruits at the optimal harvesting time. A model which can be used to determine the optimal management strategy is developed. In the model the optimal harvesting model documented by Bjorndahl (1988, 1990) in which harvesting and feed costs are considered, is extended by including release costs and how they influence the optimal number of recruits. The model forms the basis for an empirical analysis in which the optimal management strategy for a yearclass of Atlantic salmon farmed in Australia during 1989-91 is considered.
Tipo: Journal Article
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/22426

EXAMINATION OF PIG FARM TECHNOLOGY BY COMPUTER SIMULATION
Provedor de dados: 31
Autores: Szoke,   Szilvia; Nagy,   Lajos; Kovacs,   Sandor; Balogh,   Peter.
Agricultural production is among the riskiest production activities. Similarly to other branches of agriculture in animal breeding the finished product is the result of complex procedures. The biological-technological procedure, the creation of the product is affected by an outstanding number of environmental factors which also cause uncertainties. In the North Great Plain Region of Hungary, sows, gilts and slaughter pigs are produced on a corporate farm. The reliable operation data of this company provide a stable basis for and estimating future costs and revenue and their distributions. Monte Carlo methods are one of the generally accepted tools for modeling risks. The significant independent variables, their ranges and probability distributions, and the...
Tipo: Journal Article
Palavras-chave: Pig production; Computer simulation; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53561

Trade Liberalization in the South African Livestock Industry: implications for rural development
Provedor de dados: 31
Autores: Oyewumi,   Olubukola Ayodeju; Jooste,   Andre; Britz,   Wolfgang; van Schalkwyk,   Herman D.
Livestock farming is an important facet of agriculture and livelihood in South Africa. It forms the essence of rural agriculture contributing food, socio-economic stability, employment and income. After the liberalization of the agricultural sector and phasing out of past protection mechanisms South Africa introduced a process of tariff reform. Furthermore, a system of tariff rate quotas was introduced in compliance with WTO regulations. A partial equilibrium comparative static model was used to investigate the impact of further liberalization in the livestock industry of South Africa, particularly in meat products using four policy scenarios. Specific emphasis was given to the liberalization of the current TRQ regime. The implication of the results are...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/51997

Evaluating the Impact on Market Performance of Investments in Market Information Systems: Methodological Challenges
Provedor de dados: 31
Autores: Staatz,   John M.; Kizito,   Andrew M.; Weber,   Michael T.; Dembele,   Niama Nango.
Evaluating the impact on market performance of investments in agricultural market information systems (MIS) face several methodological challenges.  These fall into two broad categories:  (a) defining the dimensions of market performance to measure (which is a function of whom the MIS is designed to serve) and identifying reliable indicators of those performance dimensions, and (b) identifying the causal effects of the MIS.  The determination of causal effects in turn requires establishing a credible baseline, measuring “treatment effects” (i.e., the effects on economic behavior of receiving improved information from an MIS), dealing with problems of endogenous placement of treatment, and interpreting the validity of stakeholders’ statements and...
Tipo: Working or Discussion Paper
Palavras-chave: Market information services; Impact assessment; Market transparency; Food policies; Agricultural and Food Policy; Food Security and Poverty; International Development; Marketing; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; C81; D80; H43; N57; 013; Q13.
Ano: 2011
URL: http://purl.umn.edu/108184

Bayesian Econometrics and How to Get Rid of Those Wrong Signs
Provedor de dados: 31
Autores: Griffiths,   William E.
In many instances, Bayesian Econometrics offers a more natural interpretation of the results of a statistical investigation than does the sampling theory approach. Furthermore, the Bayesian approach provides a formal framework for incorporating prior information which is frequently available from economic theory. Despite these advantages of the Bayesian approach, applied econometric work has generally been dominated by the sampling theory approach. A simple regression example with one coefficient is used to describe the Bayesian approach using three different priors: a natural conjugate informative prior, a non informative prior, and a prior with inequality restrictions on the sign and possibly magnitude of the coefficient. The differences between the...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/9662

Designing Rainfall Insurance Contracts for Pasture, Rangeland, and Forage
Provedor de dados: 31
Autores: Nadolnyak,   Denis A.; Vedenov,   Dmitry V.
In the paper, preliminary results of the analysis of potential use of climate forecast information in designing rainfall index insurance in the southeastern region of the U.S. are reported. Joint distributions of bi-monthly rainfall and El Nino Southern Oscillation (ENSO) indexes are estimated using copula analysis of historical data. The risk reducing effectiveness of introducing premiums conditional on ENSO forecast is evaluated. The results indicate some dependence of the downward volatility of rainfall on the lagged ENSO (forecast) index, particularly in the coastal areas and in the late winter and spring.
Tipo: Conference Paper or Presentation
Palavras-chave: Rainfall index insurance; ENSO; Copulas; Agricultural Finance; Research Methods/ Statistical Methods; Risk and Uncertainty; Q14; Q54.
Ano: 2010
URL: http://purl.umn.edu/56511

MODIFYING A ONE REGION LEONTIEF INPUT-OUTPUT MODEL TO SHOW SECTOR CAPACITY CONSTRAINTS
Provedor de dados: 31
Autores: Petkovich,   Michael D.; Ching,   Chauncey T.K.
A one-region Leontief input-output model may be modified to show sector capacity constraints or 'sector destruction.' The economist must know the degree of sector destruction, level of imports of the destroyed sector's product, and make certain assumptions about the regional economy. Six cases are presented based on the degree of destruction (complete or partial) and level of imports of the destroyed sector's product (none, sufficient to reach original final demands or insufficient to reach original final demands). A linear programming version of the input-output model is suggested for three of the six cases.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/32551

Organic certification systems and international trading of agricultural products in gravity models
Provedor de dados: 31
Autores: Cantore,   Nicola; Canavari,   Maurizio; Pignatti,   Erika.
Recent literature about gravity models points out the importance of institutional frictions in the international market of agricultural products beyond the traditional economics variables as transport costs reducing the mass of trade in bilateral relationships. In particular, previous contributions stress that harmonization of food standards could decrease transaction costs in trading relationships by stimulating international market. In a previous work we hypothesized that the acknowledgment of equivalence in organic standards may represent a reliable signal of affinity in bilateral relationships which may be useful to identify areas in which transaction costs for both conventional and organic standards are lower. This article represents a step forward,...
Tipo: Conference Paper or Presentation
Palavras-chave: Gravity models; Organic standards; Transaction costs; International market; Agricultural trade; Food products; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q11; Q13.
Ano: 2008
URL: http://purl.umn.edu/6159

WHO IS MOST RESPONSIBLE FOR ENSURING  THE MEAT WE EAT IS SAFE?
Provedor de dados: 31
Autores: Erdem,   Seda; Rigby,   Dan; Wossink,   Ada.
We report results of an analysis of the attribution of relative responsibility across the stages of the food chain for ensuring food safety. Specifically, we identify perceptions of the share of the overall responsibility that each stage in the food chain has to ensure that the meat people cook and eat at home does not cause them to become ill. Results are reported for two groups of stakeholders: consumers and farmers, and for two types of meat: chicken and beef. The stakeholders’ opinions regarding the relative degrees of responsibility of the sequential food chain stages (feed supplier, farmer, livestock transportation, abattoir,… consumer) are elicited via surveys using the Maximum Difference technique (best-worst scaling). The data are analyzed using...
Tipo: Conference Paper or Presentation
Palavras-chave: Maximum Difference; Best Worst Scaling; Responsibility; Food Safety; Perception; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; Q18; Q51; D03; D12.
Ano: 2010
URL: http://purl.umn.edu/61642

AGLINK: THE OECD PARTIAL EQUILIBRIUM MODEL
Provedor de dados: 31
Autores: Conforti,   Piero; Londero,   Pierluigi.
The paper presents a general introduction to the structure and the characteristics of AGLINK, in comparison with the other most important global multi-commodity partial equilibrium models. Special reference is made to policy modelling, and particularly to the representation of the most important CAP tools, grouped into four types; direct price support, trade measures, supply management tools, and partially decoupled payments. The model is one of the most interesting efforts, especially in terms of its ability to effectively represent EU agricultural policy tools. The high level of institutional control exerted by the OECD member countries provides AGLINK with a particularly high-level of expertise, and a constant update of information; but it also prevents...
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/14808

Economic difference in Ningbo area of China
Provedor de dados: 31
Autores: Pan,   Hua-ling.
Taking 6 counties and cities in Ningbo Area as the research units, this paper constructs the index system for evaluating the economic differences in Ningbo Area, and uses the principal component analysis method to analyze the economic differences in Ningbo Area.  Result shows that Ningbo economy as a whole is more developed, and there are significant differences among regional economy.  Economic development levels of Fenghua, Xiangshan and Ninghai districts are less developed, compared with those of Yinzhou, Yuyao and Cixi.
Tipo: Thesis or Dissertation
Palavras-chave: Economic differences; Principal component analysis; Ningbo Area; China; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53476

Cereal price instability in Ethiopia: An examination of sources and policy options
Provedor de dados: 31
Autores: Shahidur,   Rashid; Meron,   Assefa.
Managing food price instability is a long standing policy challenge, which, with mixed experiences of agricultural price policy reforms, has re-emerged as a contemporary policy issue. This is particularly true for Ethiopia, where managing food price stability continues to be a formidable policy challenge. The objective of this paper is to examine the underlying causes of cereal price instabilities and to assess the policy options to manage them. It undertakes three tasks: (a) analyzes the sources and degree of cereal price instability, (b) discusses the viability of various policy options, and (c) critically reviews the country’s past, ongoing, and emerging policies for food price stabilization. The results show that the determinants of price...
Tipo: Conference Paper or Presentation
Palavras-chave: Cereal; Policy; Price instability; Ethiopia; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/51999

TWO APPROACHES TO THE MODEL SPECIFICTION PROBLEM IN ECOMONMETMETRICS
Provedor de dados: 31
Contents:    Background of Papers, by George C. Davis  Econometric Methodologies for the Model Selection Problem: An Introduction, by William G. Tomek  The Model Specification Problem from a Probabilistic Reduction Perspective, by Aris Spanos and Anya McGuirk  Bayesian Specification Analysis in Econometrics, by John Geweke and William McCausland  The Model Specification Problem from a Probabilistic Reduction Perspective: Discussion, by George C. Davis  Comments on 'Bayesian Specification Analysis in Econometrics,' by Walter N. Thurman
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/24006

Technical Barriers to Interstate Trade: Noxious Weed Regulations
Provedor de dados: 31
Autores: Gopinath,   Munisamy; Min,   He; Buccola,   Steven T.
We focus on regulations controlling the spread of noxious weeds, especially the trade effects of regulatory differences across U.S. states. We specify a gravity model for each state’s seed, nursery product, and commodity trade with each other state. Within the gravity model, we examine the role of cross-state regulatory congruence arising from ecological and agronomic characteristics and interest-group lobbying. A spatial-autoregressive Tobit model is estimated with a modified expectation-maximization algorithm. Results show that weed regulatory congruence positively affects interstate trade. By fostering cross-state regulatory differences, consumer and commodity-producer lobbying reduce the value of interstate trade by about two percent per annum.
Tipo: Journal Article
Palavras-chave: Interstate trade; Invasive species; Rent-seeking; Agribusiness; Community/Rural/Urban Development; Food Consumption/Nutrition/Food Safety; Land Economics/Use; Political Economy; Public Economics; Research Methods/ Statistical Methods; F1; H7; Q5.
Ano: 2010
URL: http://purl.umn.edu/100527

How Can We Use the Result from a DEA Analysis? Identification of Firm-relevant Reference Units
Provedor de dados: 31
Autores: Mansson,   Jonas.
Two types of guidelines can be obtained from a DEA (data envelopment analysis) analysis. Firstly, the firm can reduce input or increase production according to the DEA results. Secondly, an inefficient firm might be able to identify reference units. This makes it possible for the inefficient firm to, on site, study production that is more efficient, and thereby get information on e.g. efficient organisational solutions. In this study, we focus on how to detect these firm-relevant reference units. While applying the existing methods for identification of reference units, i.e. the intensity variable method and the dominance method, on a data set concerning booking centres in the Swedish taxi market, shortcomings in these methods were identified. This...
Tipo: Journal Article
Palavras-chave: Reference units; Firm-relevant; DEA; Research Methods/ Statistical Methods; D24; L25.
Ano: 2003
URL: http://purl.umn.edu/44072

A Methodological Note on the Estimation of Programming Models
Provedor de dados: 31
Autores: Heckelei,   Thomas; Wolff,   Hendrik.
The paper introduces a general methodological approach for the estimation of constrained optimisation models in agricultural supply analysis. It is based on optimality conditions of the desired programming model and shows a conceptual advantage compared to Positive Mathematical Programming in the context of well posed estimation problems. Moreover, it closes the empirical and methodological gap between programming models and duality based functional models with explicit allocation of fixed factors. Monte Carlo simulations are performed with a maximum entropy estimator to evaluate the functionality of the approach as well as the impact of empirically relevant prior information in small sample situations.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural Supply Analysis; Programming Models; Maximum Entropy Estimation; Prior Information; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/24896

A BAYESIAN ALTERNATIVE TO GENERALIZED CROSS ENTROPY SOLUTIONS FOR UNDERDETERMINED ECONOMETRIC MODELS
Provedor de dados: 31
Autores: Heckelei,   Thomas; Mittelhammer,   Ronald C.; Jansson,   Torbjorn.
This paper presents a Bayesian alternative to Generalized Maximum Entropy (GME) and Generalized Cross Entropy (GCE) methods for deriving solutions to econometric models represented by underdetermined systems of equations. For certain types of econometric model specifications, the Bayesian approach provides fully equivalent results to GME-GCE techniques. However, in its general form, the proposed Bayesian methodology allows a more direct and straightforwardly interpretable formulation of available prior information and can reduce significantly the computational effort involved in finding solutions. The technique can be adapted to provide solutions in situations characterized by either informative or uninformative prior information.
Tipo: Working or Discussion Paper
Palavras-chave: Underdetermined Equation Systems; Maximum Entropy; Bayesian Priors; Structural Estimation; Calibration; Research Methods/ Statistical Methods; C11; C13; C51.
Ano: 2008
URL: http://purl.umn.edu/56973

A Numerical Stochastic Control model of Range Management
Provedor de dados: 31
Autores: Beard,   Rodney.
An optimal stochastic control model of grazing that incorporates both pasture and livestock dynamics is presented. The model is solved numerically using Markov chain approximation methods. Markov chain approximation methods have a number of advantages as a means of solving stochastic optimal control methods compared with the usual alternatives. In particular, optimal control of the approximating Markov chain may be determined using Linear programming methods, thus making optimal stochastic control methods accessible to a wider audience.
Tipo: Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/123643

Stata tip 72: Using the Graph Recorder to create a pseudograph scheme
Provedor de dados: 31
Autores: Crow,   Kevin.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122630

Review of Statistics with Stata (Updated for Version 8) by Hamilton
Provedor de dados: 31
Autores: Williams,   Richard A.
This article reviews Statistics with Stata (Updated for Version 8) by Hamilton.
Tipo: Journal Article
Palavras-chave: Introductory; Teaching; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116239

An Application of Experimental Economics to Agricultural Policies: The Case of U.S. Dairy Deregulation on Farm-Level Markets
Provedor de dados: 31
Autores: Doyon,   Maurice; Novakovic,   Andrew M.
Current dairy regulations in the U.S. are the result of over 80 years of regulatory activities. Through the 1920s and 1930s the U.S. government passed various acts designed to increase the share of market surplus captured by sellers, which at the time was judged insufficient. Lately, budget constraints and commitments to freer trade agreement have let the government and some dairy sector leaders contemplate different levels of dairy deregulation. The elimination of the Federal Milk Marketing Orders (FMMOs), a cornerstone of U.S. dairy regulation, has emerged as a possibility. The thought of eliminating the FMMOs was particularly disturbing to milk producers because of uncertainty regarding what might happen to the farm price, the volume of raw milk...
Tipo: Technical Report
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/122807

Costing water quality improvements with auction mechanisms: case studies for the Great Barrier Reef in Australia
Provedor de dados: 31
Autores: Rolfe,   John; Windle,   Jill.
Australian governments continue to commit significant resources to the protection of the Great Barrier Reef. Funding for the Reef Rescue Programme is focused on reducing the impact of agricultural production on water quality.   Information about the costs and benefits of funding proposals is limited. As a result, the key challenge for policy makers is to identify where funding is most efficiently applied. While there is adequate information about the costs of various inputs for reducing water quality, the costs of achieving various outputs is much more limited.  Water quality tenders show the opportunity costs of changing agricultural practices. They allow policy makers to better understand the potential costs of misallocating public resources. It also...
Tipo: Report
Palavras-chave: Auctions; Conservation tenders; Market based instruments; Water quality; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94884

Mata Matters: Overflow, underflow and the IEEE floating–point format
Provedor de dados: 31
Autores: Linhart,   Jean Marie.
Mata is Stata’s matrix language. The Mata Matters column shows how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. In this quarter’s column, we investigate underflow and overflow and then delve into the details of how floating-point numbers are stored in the IEEE 754 floating-point standard. We show how to test for overflow and underflow. We demonstrate how to use the %21x format to see underflow and the %16H, %16L, %8H, and %8L formats for displaying the byte content of doubles and floats.
Tipo: Article
Palavras-chave: Underflow; Overflow; Denormalized number; Normalized number; Subnormal number; Double precision; Missing values; IEEE 754; Format; Binary; Hexadecimal; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122590

The Impact of Agricultural Growth on Rural Non-Farm Incomes and Employment in Alabama
Provedor de dados: 31
Autores: Brazil,   LaTravis; Bukenya,   James O.
The rural nonfarm economy is the backbone of the economy of numerous small towns scattered throughout the Black Belt region, as well as the primary source of income and employment. Seen in this light, the rural nonfarm economy will play a key role in determining future prospects for employment growth and poverty alleviation in the Alabama Black Belt region. The objective in this paper therefore is to examine the importance of rural-urban growth linkages with a focus on the Black Belt region and estimate agricultural growth multipliers. The analysis uses cross-section data to estimate econometrically the indirect rural employment and income generated by agricultural growth. Two major sections address the study objective. The first examines the importance,...
Tipo: Conference Paper or Presentation
Palavras-chave: Rural-Urban Linkages; Counties; Multipliers; Employment; Agribusiness; Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/56482

CURRENT STATUS OF BENEFITS TRANSFER IN THE U.S.: A REVIEW
Provedor de dados: 31
Autores: Bergstrom,   John C.
Benefits transfer refers to the use of existing benefit estimates in a different, but similar context as compared to the original study which generated the benefit estimates.  Benefits transfer techniques include fixed value transfer, expert opinion, and value estimator models.  Although benefits transfer techniques are subject to a number of conceptual and empirical limitations, these techniques are widely applied in the United States in economic assessments of public policies and projects.  The application of benefits transfer in natural resource damage assessment cases is relatively untested in the United States court system.
Tipo: Working or Discussion Paper
Palavras-chave: Benefits transfer; Conceptual background; United States applications; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/16636

NEW MEMBER STATES AND CROSS COMPLIANCE: THE CASE OF POLAND
Provedor de dados: 31
Autores: Bezlepkina,   Irina V.; Jongeneel,   Roelof A.; Karaczun,   Zbigniew.
The New Member States did not yet have to implement the full cross-compliance package. Currently the GEAC requirements in the conditionality clause for the direct payments. The SMRs will become part of it starting from 2009. This paper looks into the Polish case and looks whether timely implementation is feasible. Several factors are mentioned, indicating that this will be a hard task. The problems with implementation explain why the new member states are advocating a gradual phasing in of the SMRs.
Tipo: Conference Paper or Presentation
Palavras-chave: Cross-compliance; Agricultural policy; Agricultural and Food Policy; Research Methods/ Statistical Methods; C01; C02; Q12; Q13.
Ano: 2008
URL: http://purl.umn.edu/44852

The simulation extrapolation method for fitting generalized linear models with additive measurement error
Provedor de dados: 31
Autores: Hardin,   James W.; Schmiediche,   Henrik; Carroll,   Raymond J.
We discuss and illustrate the method of simulation extrapolation for fitting models with additive measurement error. We present this discussion in terms of generalized linear models (GLMs) following the notation defined in Hardin and Carroll (2003). As in Hardin, Schmiediche, and Carroll (2003), our discussion includes specified measurement error and measurement error estimated by replicate error-prone proxies. In addition, we discuss and illustrate three extrapolant functions.
Tipo: Journal Article
Palavras-chave: Simulation extrapolation; Measurement error; Instrumental variables; Replicate measures; Generalized linear models; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116184

Designing choice experiments to Test for Anchoring and Framing Effects
Provedor de dados: 31
Autores: Kragt,   Marit Ellen; Bennett,   Jeffrey W.
Choice experiments (CE) are increasingly used as a stated preference technique to value changes in non-market goods. Respondents to a CE survey are asked to make repeated choices between alternatives. Each alternative is described by a number of attributes – the attributes levels vary across alternatives and choice sets. A monetary attribute is typically included so that marginal values for changes in the non-market attributes presented can be estimated.   The monetary attribute has central importance. However, there has been limited research on the impacts on respondents’ choices of changing the (range in) levels of the monetary attribute presented in CE surveys. This is known as the ‘anchoring’ effect. The ‘framing’ of non-market attributes may also...
Tipo: Report
Palavras-chave: Choice experiments; Valuation; Anchoring effect; Starting point bias; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/94810

Impacts of Exchange Rate Volatility on the U.S. Cotton Exports
Provedor de dados: 31
Autores: Bajpai,   Siddharth; Mohanty,   Samarendu.
A structural time series approach utilizing the state space model is used to analyze the impact of exchange rate volatility on the bilateral U.S. cotton exports to major export destinations. An EGARCH (Exponential Generalized Autoregressive Conditional Heteroskedasticity) model with normal and non-normal errors is used to estimate the volatility of exchange rate. Monthly data from 1995 to 2006 is utilized for the analysis. The results indicate a negative relationship between exchange rate volatility and U.S. cotton exports for most countries. The stochastic process governing the U.S. cotton exports to different countries is found to be permanent as well as transitory. The results support the view that the impact of exchange rate volatility can be better...
Tipo: Conference Paper or Presentation
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6849

Using Choice Experiment to Estimate Consumer Valuation: the Role of Experiment Design and Attribute Information Loads
Provedor de dados: 31
Autores: Gao,   Zhifeng; Yu,   Xiaohua; House,   Lisa.
Replaced with revised version of paper 09/22/09.
Tipo: Conference Paper or Presentation
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49406

THE ROLE OF SMALL BUSINESS IN ECONOMIC GROWTH AND POVERTY ALLEVIATION IN WEST VIRGINIA: AN EMPIRICAL ANALYSIS
Provedor de dados: 31
Autores: Gebremariam,   Gebremeskel H.; Gebremedhin,   Tesfa G.; Jackson,   Randall W.
In OLS and 2SLS regression analysis a positive relationship exists between small business and economic growth. A strong inverse relationship also exists between the incidence of poverty and small business and economic growth. Thus, the empirical result establishes the linkage between small business, economic growth and the incidence of poverty
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20290

Discussion of George G. Judge's Estimation and Statistical Inference in Economics
Provedor de dados: 31
Autores: Foote,   Richard J.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/96807

Agricultural Trade Flows among Developing Countries: Do Regional Preferential Trade Agreements make a Difference?
Provedor de dados: 31
Autores: Tembo,   Gelson; Jayne,   Thomas S.
Regional integration through trade is recognized as one way to foster economic growth and poverty reduction. This paper uses the gravity model and 11-year panel data (1996-2006) on Southern African Development Community (SADC) member countries to study Zambia’s regional agricultural trade flows and the impact of the SADC Trade Protocol (SADC-TP). Zambia’s volume of trade is significantly related to most of the standard gravity variables. The results indicate that Zambia has been largely trading below potential, especially with respect to exports. There have been improvements in Zambia’s trade flows during the SADC-TP period but only with a few countries. Further improvements will require re-examining protocol implementation and individual countries’...
Tipo: Conference Paper or Presentation
Palavras-chave: Southern Africa; Regional trade; Gravity analysis; Zambia; Agricultural and Food Policy; Food Security and Poverty; International Relations/Trade; Marketing; Research Methods/ Statistical Methods; C23; C51; F12; F14; F15.
Ano: 2009
URL: http://purl.umn.edu/51733

A UNIFIED APPROACH TO SENSITIVITY ANALYSIS IN EQUILIBRIUM DISPLACEMENT MODELS: COMMENT
Provedor de dados: 31
Autores: Griffiths,   William E.; Zhao,   Xueyan.
It is pointed out that the Chebychev confidence intervals and maximum p-values advocated by Davis and Espinoza for sensitivity analysis of equilibrium displacement models are unnecessary. Desired probability intervals and probabilities can be accurately estimated without resorting to gross approximations.
Tipo: Working or Discussion Paper
Palavras-chave: Simulation; Probability distributions; Empirical quantiles; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/12950

SIND ERFOLGREICHE BETRIEBSLEITER TATSÄCHLICH ERFOLGREICH? DAS POTENZIAL FÜR FEHLINTERPRETATIONEN BEI DER KENNZAHL ‚NETTORENTABILITÄT‘
Provedor de dados: 31
Autores: Blanck,   Niklas; Bahrs,   Enno.
B1_2
Tipo: Conference Paper or Presentation
Palavras-chave: Nettorentabilität; Testbetriebsnetz; Bodenbewertung; Betriebsanalyse; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93942

A Nonlinear Generalized Additive Error Model of Production and Cost
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
In 1944, Marschak and Andrews published a seminal paper on how to obtain consistent estimates of a production technology. The original formulation of the econometric model regarded the joint estimation of the production function together with the first-order necessary conditions for profit-maximizing behavior. In the seventies, with the advent of econometric duality, the preference seemed to have shifted to a dual approach. Recently, however, Mundlak resurrected the primal-versus-dual debate with a provocative paper titled “Production Function Estimation: Reviving the Primal.” In that paper, the author asserts that the dual estimator, unlike the primal approach, is not efficient because it fails to utilize all the available information. In this paper we...
Tipo: Working or Discussion Paper
Palavras-chave: Primal; Dual; Cobb-Douglas; Nonlinear errors-in-variables; Productivity Analysis; Research Methods/ Statistical Methods; D0; C3.
Ano: 2004
URL: http://purl.umn.edu/93743

A CRITIQUE OF THE CONSTANT ELASTICITY OF TRANSFORMATION (CET) LINEAR SUPPLY SYSTEM
Provedor de dados: 31
Autores: Shumway,   C. Richard; Powell,   Alan A.
An elusive restriction maintained in earlier CET supply models with three or more products is shown to result in a potentially serious misspecification.  Its impact on empirical estimates is found to be substantial, and an alternative formulation is presented which overcomes the problem while still maintaining the CET hypothesis.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/32129

Analysis of Environmental and Economic Efficiency: Application of the Overseer model and simulated data
Provedor de dados: 31
Autores: Ramilan,   Thiagarajah; Scrimgeour,   Frank G.; Marsh,   Dan.
New Zealand’s success in raising agricultural productivity has been accompanied by higher input use, leading to adverse effects on the environment. Until recently, analysis of farm performance has tended to ignore such negative externalities. The current emphasis on environmental issues has led dairy farmers to target improvements in both environmental performance and productivity. Therefore measuring the environmental performance of farms and integrating this information into farm productivity calculations should assist informed policy decisions which promote sustainable development. However this is a challenging process since conventional environmental efficiency measures are usually based on simple input and output flows but nitrogen discharge is a...
Tipo: Conference Paper or Presentation
Palavras-chave: Data Envelopment Analysis; Economic; Efficiency; Environment; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/97161

Multilingual datasets
Provedor de dados: 31
Autores: Weesie,   Jeroen.
This insert describes a new command mlanguage that facilitates the creation and maintenance of “comprehensive” multilingual datasets. These are datasets with many variables, many of which are value labeled, with labels in different languages, all contained within the dataset. The tools make it easy to add labels in a new language by translating an existing set of labels, to switch between the sets of labels, to verify the integrity of such labels, and to assist in keeping the labels complete.
Tipo: Journal Article
Palavras-chave: Mlanguage; Multilingual datasets; Data integrity; Value labels; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117510

Accounting for Respondent Uncertainty to Improve Willingness-to-Pay Estimates
Provedor de dados: 31
Autores: Moore,   Rebecca; Bishop,   Richard C.; Provencher,   Bill; Champ,   Patricia A.
In this paper we develop an econometric model of willingness to pay that integrates data on respondent uncertainty regarding their own willingness to pay. The integration is utility consistent and does not involve calibrating the contingent responses to actual payment data, and so the approach can “stand alone”. In an application to a valuation study related to whooping crane restoration, we find that this model generates a statistically lower expected WTP than the standard CV model. Moreover, the WTP function estimated with this model is not statistically different from that estimated using actual payment data, suggesting that when properly analyzed using data on respondent uncertainty, contingent valuation decisions can simulate actual payment decisions....
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/92233

Speaking Stata: Correlation with confidence, or Fisher's z revisited
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Ronald Aylmer Fisher suggested transforming correlations by using the inverse hyperbolic tangent, or atanh function, a device often called Fisher’s z transformation. This article reviews that function and its inverse, the hyperbolic tangent, or tanh function, with discussions of their definitions and behavior, their use in statistical inference with correlations, and how to apply them in Stata. Examples show the use of Stata and Mata in calculator style. New commands corrci and corrcii are also presented for correlation confidence intervals. The results of using bootstrapping to produce confidence intervals for correlations are also compared. Various historical comments are sprinkled throughout.
Tipo: Article
Palavras-chave: Corrci; Corrcii; Correlation; Confidence intervals; Fisher's z; Transformation; Bootstrap; Mata; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122603

A conversation with William Gould
Provedor de dados: 31
Autores: Newton,   H. Joseph.
William Gould is President of StataCorp. He was born in Burbank, California, on January 21, 1952. He received a B.A. in economics from UCLA in 1974 and a C.Phil. in economics from UCLA in 1977, after initially majoring in physics and then engineering. He studied economics in the Ph.D. program at UCLA and was simultaneously a Research Fellow at The Rand Corporation. He did not turn in his dissertation in labor economics before becoming a Senior Research Associate at the National Bureau of Economic Research in Stanford, California, in 1977. In 1979, he become a Senior Economist at Unicon Research Corporation in Los Angeles, a company that he helped to found. He cofounded and served as Vice-President of Computing Resource Center in 1982, the company that went...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117492

Anatomy of Stigmatized Behavior: Peer Influence and Relative Concern
Provedor de dados: 31
Autores: Chen,   Xi.
This paper is based on an ongoing joint work with David Sahn and Xiaobo Zhang.
Tipo: Conference Paper or Presentation
Palavras-chave: Social Stigma; Peer Influences; Relative Concern; Blood Donation; China; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Food Security and Poverty; Health Economics and Policy; Institutional and Behavioral Economics; International Development; Labor and Human Capital; Research Methods/ Statistical Methods; Risk and Uncertainty; JEL: I32; J22; D13; D63.
Ano: 2011
URL: http://purl.umn.edu/103644

The Takayama and Judge Price and Allocation Models and its application in non-linear Price Transmission Analysis Approaches
Provedor de dados: 31
Autores: Araujo-Enciso,   Sergio Rene.
Tipo: Working or Discussion Paper
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods; C15; C18; C62.
Ano: 2011
URL: http://purl.umn.edu/103432

A User's Guide to SIDE (Software for Intake Distribution Estimation)
Provedor de dados: 31
Autores: Novenario,   Mary Jane.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/18642

A PROGRAMMING APPROACH TO ESTIMATE PRODUCTION FUNCTIONS USING BOUNDS ON THE TRUE PRODUCTION SET
Provedor de dados: 31
Autores: Lambert,   David K.
Varian (1984) developed procedures to establish bounds on a true convex negative monotonic production set that p-rationalizes a set of data consistent with the weak axiom of profit maximization.  These bounds can provide additional information for estimating parametric production functions.  A mathematical programming procedure is developed to maximize various measures of goodness of fit of alternative parametric specifications relative to the true production set.
Tipo: Working or Discussion Paper
Palavras-chave: Nonparametric technique; Production; Production functions; Production Economics; Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/12956

Modelling Fresh Strawberry Supply “From-Farm-to-Fork” as a Complex Adaptive Network
Provedor de dados: 31
Autores: Engelseth,   Per; Karlsen,   Anniken; Verwaart,   Tim.
The purpose of this study is to model and thereby enable simulation of the complete business entity of fresh food supply. A case narrative of fresh strawberry supply provides basis for this modelling. Lamming et al. (2000) point to the importance of discerning industry-specific product features (or particularities) regarding managing supply networks when discussing elements in “an initial classification of a supply network” while Fisher (1997) and Christopher et al. (2006, 2009) point to the lack of adopting SCM models to variations in products and market types as an important source of SCM failure. In this study we have chosen to move along a research path towards developing an adapted approach to model end-to-end fresh food supply influenced by a...
Tipo: Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Production Economics; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/122012

Business Process Modelling in Demand‐Driven Agri‐Food Supply Chains
Provedor de dados: 31
Autores: Verdouw,   Cor N.; Beulens,   Adriaan J.M.; Trienekens,   Jacques H.; Wolfert,   Sjaak.
Agri‐food companies increasingly participate in demand‐driven supply chains that are able to adapt flexibly to changes in the marketplace. The objective of this presentation is to discuss a process modelling framework, which enhances the interoperability and agility of information systems as required in such dynamic supply chains. The designed framework consists of two parts: an object system definition and a modelling toolbox. The object system definition provides a conceptual definition of business process in demand‐driven supply chains from a systems perspective. It includes an application of the Viable Systems Model of Stafford Beer to supply chains, and classifications of business processes, control systems and coordination mechanisms. The modelling...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100477

Appreciative Inquiry: An approach for learning and change based on our own best practices
Provedor de dados: 31
Autores: Acosta,   Anne Starks; Douthwaite,   Boru.
Since it was conceptualized in the late 1980s as a research methodology and change paradigm, the technique of ‘appreciative inquiry’ (AI) has proved to be highly effective for capturing the positive features of an organization or social system and energizing the members to strive for higher levels of performance. This Brief outlines the basic principles and methods of AI, describes various domains in which it has been undertaken and provides a recent example of its use in a centre affiliated with the Consultative Group on International Agricultural Research (CGIAR).
Tipo: Report
Palavras-chave: Research; Methodology; Inquiry; Social systems; Agricultural and Food Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/52516

AN EXPERIMENT IN MULTIATTRIBUTE UTILITY THEORY
Provedor de dados: 31
Autores: Delforce,   Robert J.; Hardaker,   J. Brian.
A version of multiattribute utility theory is evaluated as an aid to social decision making using an Australian case study. A multiattribute utility function is assessed over the descriptive, discrete decision alternatives of the decision problem rather than over the risky consequences of the attributes as in the standard approach. The evaluation is made first from the perspective of the decision analysts as a test of the feasibility of the method, and second, from the perspective of social decision makers as a test of the value of the analysis to them. Several difficulties arose in administering the procedure, and the decision makers were sceptical about the derived prescriptions. Nevertheless, the research findings appear to support the proposition that...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/22330

From the help desk: Swamy's random-coefficients model
Provedor de dados: 31
Autores: Poi,   Brian P.
This article discusses the Swamy (1970) random-coefficients model and presents a command that extends Stata’s xtrchh command by also providing estimates of the panel-specific coefficients.
Tipo: Journal Article
Palavras-chave: Panel data; Random-coefficients models; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116121

A Limited Information Bayesian Forecasting Model of the Cattle SubSector
Provedor de dados: 31
Autores: Abidoye,   Babatunde O.; Lawrence,   John D.
The first step towards forecasting the price and output of the cattle industry is understanding the dynamics of the livestock production process. This study follows up on the Weimar and Stillman (1990) paper by using data from 1970 to 2005 to estimate the parameters that characterizes the cattle output supply. The model is then used to estimate forecast values for the periods 2006 and 2007. Bayesian limited information likelihood method is used to estimate the parameters when endogeneity exists between these variables. The forecasting ability of the model for a two-step ahead forecast for majority of the variables are relatively good and test statistic of the forecast are reported.
Tipo: Conference Paper or Presentation
Palavras-chave: Cattle; Bayesian; Forecasting; Inventory; Slaughter; Agribusiness; Agricultural Finance; Financial Economics; Livestock Production/Industries; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53051

Econometric models of the demand for quality-differentiated goods
Provedor de dados: 31
Autores: Hanemann,   W. Michael.
This paper presents several models of the demand for quality differentiated goods in which the consumer decides which brand of product to select as well as how many units to buy. The models cover a variety of preference structures and can readily be estimated using standard techniques for switching regressions. From the fitted demand equations, one can calculate monetary measures of the welfare effects of changes in the price, quality, or variety of the brands. The models are then applied to data on households' demands for recreation sites in the Boston area, and the values of the sites are calculated.
Tipo: Working or Discussion Paper
Palavras-chave: Consumer/Household Economics; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1983
URL: http://purl.umn.edu/6294

The Maximal Payoff and Coalition Formation in Coalitional Games
Provedor de dados: 31
Autores: Zhao,   Jingang.
This paper first establishes a new core theorem using the concept of generated payoffs: the TU (transferable utility) core is empty if and only if the maximum of generated payoffs (mgp) is greater than the grand coalition’s payoff v(N), or if and only if it is irrational to split v(N). It then provides answers to the questions of what payoffs to split, how to split the payoff, what coalitions to form, and how long each of the coalitions will be formed by rational players in coalitional TU games. Finally, it obtains analogous results in coalitional NTU (non-transferable utility) games.
Tipo: Working or Discussion Paper
Palavras-chave: Coalition Formation; Core; Maximal Payoff; Minimum No-Blocking Payoff; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; C62; C71.
Ano: 2008
URL: http://purl.umn.edu/6298

Investigating linkages between economic growth, energy consumption and pollutant emissions in Tunisia
Provedor de dados: 31
Autores: Chebbi,   Houssem Eddine.
The aim of this study is to understand long and short-run linkages between economic growth, energy consumption and carbon emission using Tunisian data over the period 1971-2004. Cointegration procedure is used to analyze the time series properties of the series and error-correction terms were considered to test for the direction of Granger causality. Statistical findings indicate that economic growth, energy consumption and CO2 emission are related in the long-run and provide some evidence of inefficient use of energy in Tunisia, since environmental pressure tends to rise faster than economic growth. The short-run analysis, provide support for causality running from CO2 emissions growth to output growth, both in the short-run and the long-run. The results...
Tipo: Conference Paper or Presentation
Palavras-chave: Pollutant emissions; Economic growth; Cointegration; Causality; Tunisia; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/50944

A Comparison of the Effectiveness of Using Futures, Options, LRP Insurance, or AGR-Lite Insurance to Manage Risk for Cow-calf Producers
Provedor de dados: 31
Autores: Feuz,   Dillon M.
A comparative analysis was performed looking at using cash, futures, options, or insurance to manage the price of calves for cow-calf producer. Risk can be reduced with the futures market and with options or LRP insurance. Options and LRP insurance are equivalent in the amount of risk that is reduced. AGR-Lite does not appear to be an effective policy at reducing risk for cow-calf producers.
Tipo: Conference Paper or Presentation
Palavras-chave: Cow-calf risk; Feeder cattle futures; Options; LRP Feeder Cattle; AGR-Lite; Agribusiness; Agricultural Finance; Demand and Price Analysis; Farm Management; Financial Economics; Livestock Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53046

Diseno de un indice sintetico de desarrollo sostenible y aplicacion a la Union Europea
Provedor de dados: 31
Autores: Laxe,   Fernando I. Gonzalez; Palmero,   Federico G. Martin.
En el presente artículo se establecen las bases metodológicas y se diseña un índice sintético global de desarrollo sostenible que cumple tres condiciones: se adapta a los principios de Presión – Estado – Respuesta, adopta los mandatos de la Agenda 21 Local y se adecua a los cuatro componentes o dimensiones básicas de la sostenibilidad: institucional, medioambiental, económica y social. A partir de dicha metodología se construye el índice sintético sobre el cómputo de 78 variables, 37 subindicadores y 13 indicadores, agrupados éstos en las cuatro dimensiones citadas para, a continuación, proceder a su aplicación a  los países de la UE.  Palabras clave: Recursos Naturales, Medio Ambiente, Desarrollo Sostenible, Unión Europea.  SUMMARY  This article...
Tipo: Journal Article
Palavras-chave: Natural Resources; Environment; Sustainable Development; European Union; Research Methods/ Statistical Methods; Q5; R1.
Ano: 2004
URL: http://purl.umn.edu/28728

ESTIMATING THE CHARACTERISTICS OF HOMOGENEOUS FUNCTIONSUSING FLEXIBLE FUNCTIONAL FORMS
Provedor de dados: 31
Autores: O'Donnell,   Christopher J.
A flexible functional form can provide a second-order approximation to an arbitrary unknown function at a single point. Except in special cases, the parameters of flexible forms will vary from one point of approximation to another. I use this property to show that, in general, if an unknown function is homogeneous then i) Euler's Theorem gives rise to linear equality constraints involving both the data and a set of observation-varying flexible form parameters, ii) the common practice of imposing homogeneity on flexible functional forms is unnecessarily restrictive, and iii) it is possible to obtain estimates of the observation-varying parameters of approximating flexible forms using a Singular Value Decomposition (SVD) estimator. Two illustrations are...
Tipo: Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/123713

PROBLEMS WITH THE TREATMENT OF TIME IN THE TRAVEL COST METHOD
Provedor de dados: 31
Autores: Garcia,   Cristina.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/13408

Stata tip 4: Using display as an online calculator
Provedor de dados: 31
Autores: Ryan,   Philip.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116216

TEMPORAL INSENSITIVITY OF PVWTP AND IMPLIED DISCOUNT RATES IN CVM
Provedor de dados: 31
Autores: Kim,   Sooil; Haab,   Timothy C.
The sensitivity of WTP is tested in terms of the present value and the implied discount rates are derived by varying the length of benefit and the temporal payment schedules.  Results show that holding the length of the project constant, the present value of willingness to pay does not vary significantly across payment schemes (one time payment, versus life of the project, versus perpetuity).  Heteroskedasticity of error term over payment schemes fails to be accepted. Holding the payment scheme constant, the present value of WTP is insensitive to the life of the project (5 or 10 years). The implied discount rates are high as previous literatures.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/21921

Die monetäre Bewertung von Naturgütern zwischen ökonomischer Theorie und politischer Umsetzung
Provedor de dados: 31
Autores: Hampicke,   Ulrich.
During the past 15 or so years, a considerable number of valuation studies have been published in German language concerning nature conservation mostly in the agrarian countryside, using the Contingent Valuation Method (CVM). These are documented here and briefly commented on. In the sequel, well-known objections in the literature against this method are discussed and rejected or at least attenuated, thereby referring to more comprehensive literature. Upon careful design, the results from CVM studies bear closer examination as to their reliability. It seems doubtful, however, and must even be regarded as refuted in some special cases that their very objective, as formulated from a rigorous microeconomic position, is achieved, that is the disclosure of the...
Tipo: Journal Article
Palavras-chave: Nature conservation; Contingent Valuation Method (CVM); Compensating Variation (CV); Equivalent Variation (EV); Application of CVM results; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/98085

NONCONCAVE, NONMONOTONIC NETWORK EXTERNALITIES
Provedor de dados: 31
Autores: Yang,   Yi-Nung; Barrett,   Christopher B.
Tipo: Working or Discussion Paper
Palavras-chave: Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/28350

Geography and Economic Transition: Global Spatial Analysis at the Grid Cell Level
Provedor de dados: 31
Autores: Motamed,   Mesbah J.; Florax,   Raymond J.G.M.; Masters,   William J.
This paper addresses the timing of historical transition from rural to urban activity. In our model, rural production has constant returns and meets subsistence needs, while urban production has scale economies and meets the demands of higher-income consumers. Urbanization occurs sooner when rural or urban productivity is higher or transport costs are lower. We test the model on worldwide data that divides the earth's surface at half-degree intervals into over 60,000 cells. From an independent estimate of each cell's rural and urban population history, we identify the date at which each cell achieves various thresholds of urbanization. Controlling for country fixed effects and neighbors' urbanization using spatial techniques, we find that the date at which...
Tipo: Conference Paper or Presentation
Palavras-chave: Economic growth; Economic geography; Urbanization; Agriculture; Community/Rural/Urban Development; Research Methods/ Statistical Methods; C21; N50; O11; O18; R1.
Ano: 2009
URL: http://purl.umn.edu/49589

Strategic response to a sequence of discrete choice questions
Provedor de dados: 31
Autores: McNair,   Ben J.; Bennett,   Jeffrey W.; Hensher,   David A.
According to neoclassical economic theory, the only stated preference elicitation format that can feasibly be employed in field studies to which truthful response can be the dominant strategy for all respondents is a single binary choice between the status quo and one alternative. In studies where the objective is estimation of preferences for multiple attributes of a good, it is preferred (and, in some cases, necessary) based on econometric considerations, to present respondents with a sequence of choice tasks. Economic theory predicts that utility-maximising respondents may find it optimal to misrepresent their preferences in this elicitation format. In this paper, the effect on stated preferences of expanding the number of choice tasks per respondent...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice experiments; Willingness to pay; Incentive compatibility; Strategic behaviour; Order effects; Underground electricity; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/59102

Stata tip 19: A way to leaner, faster graphs
Provedor de dados: 31
Autores: Royston,   Patrick.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117519

Estimation of Consumer Demand Functions When the Observed Prices Are the Same for All Sample Units
Provedor de dados: 31
Autores: Paris,   Quirino.
With the advent of the almost ideal demand system (AIDS) of Deaton and Muellbauer, the estimation of consumer demand functions revolves around specifications that use flexible functional forms of the indirect utility function. This dual approach has put on the backburner the traditional primal approach because the direct utility function exists only in a latent state. The lack of explicit, analytical invertibility of either system, however, is an indication that focusing exclusively on the dual side of the consumer problem is equivalent to disregard potentially important and independent information residing with the primal side. This paper suggests that efficient estimates (in the sense of using all the available information) of the demand functions...
Tipo: Working or Discussion Paper
Palavras-chave: Consumer demand functions; Primal; Dual; Nonlinear errors-in-variables; Demand and Price Analysis; Research Methods/ Statistical Methods; D0.
Ano: 2003
URL: http://purl.umn.edu/93739

Efficiency benefits of choice model experimental design updating: a case study
Provedor de dados: 31
Autores: Kerr,   Geoffrey N.; Sharp,   Basil M.H.
Efficient experimental designs offer the potential to reduce confidence intervals for parameters of interest in choice models, or to reduce required sample sizes. C-efficiency recognises the salience of willingness to pay estimates rather than utility function parameters. This study reports on a choice model application that incorporated updated statistical designs based on initial responses in order to maximise C-efficiency. The revised design delivered significant improvements.
Tipo: Conference Paper or Presentation
Palavras-chave: Experimental design; Choice experiment; Efficiency; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/47623

Driving Factors and Model of Change in Arable Land Area in China
Provedor de dados: 31
Autores: Lei,   Zhanbo; Du,   Haowen.
We analyze the characteristics of the change in arable land area in China according to the change data of arable land area and other relevant data from the year 1996 to 2006, and adopt Factor Analysis Method and Stepwise Regression Method to carry out quantitative analysis on the driving factors of arable land change of China. We also establish the regression model of driving factors and arable land area. Finally, some corresponding suggestions are put forward.
Tipo: Thesis or Dissertation
Palavras-chave: Arable land; Driving factor; Factor analysis; Regression analysis; China; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53592

Optimal Sampling Under a Geostatistical Model
Provedor de dados: 31
Autores: Pautsch,   Gregory R.; Babcock,   Bruce A.; Breidt,   F. Jay.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/18424

A PRIMAL-DUAL ESTIMATOR OF PRODUCTION AND COST FUNCTIONS WITHIN AN ERRORS-IN-VARIABLES CONTEXT
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
In 1944, Marschak and Andrews published a seminal paper on how to obtain consistent estimates of a production technology. The original formulation of the econometric model regarded the joint estimation of the production function together with the first-order necessary conditions for profit-maximizing behavior. In the seventies, with the advent of econometric duality, the preference seemed to have shifted to a dual approach. Recently, however, Mundlak resurrected the primal-versus-dual debate with a provocative paper titled “Production Function Estimation: Reviving the Primal.” In that paper, the author asserts that the dual estimator, unlike the primal approach, is not efficient because it fails to utilize all the available information. In this paper we...
Tipo: Working or Discussion Paper
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/11975

Stata tip 29: For all times and all places
Provedor de dados: 31
Autores: Franklin,   Charles H.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117565

Calculating Murphy–Topel variance estimates in Stata: A simplified procedure
Provedor de dados: 31
Autores: Hole,   Arne Risa.
Building on the work by Hardin (Stata Journal 2: 253–266), this note shows how the calculation of the Murphy–Topel variance estimator for two-step models can be simplified in Stata by using the scores option of predict.
Tipo: Article
Palavras-chave: Two-step estimation; Murphy–Topel estimator; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119242

Does ignoring multidestination trips in the travel cost method cause a systematic bias?
Provedor de dados: 31
Autores: Kuosmanen,   Timo; Nillesen,   Eleonora; Wesseler,   Justus.
The present paper demonstrates that treating multidestination trips (MDT) as single‐destination trips does not involve any systematic upward or downward bias in consumer surplus (CS) estimates because the direct negative effect of a price increase (treating MDT as a single‐destination trip) is offset by a shift in the estimated demand curve. Still, ignoring MDT can greatly underestimate or overestimate the CS. In addition, we demonstrate that there is a sound theoretical basis for using preference information for allocating travel costs between different sites included in the MDT package. A novel extreme value approach is proposed, which does not require any overly restrictive assumptions about consumer preferences. This approach is applied to the zonal...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/117997

GIBRAT'S LAW REVISITED IN A TRANSITION ECONOMY. THE HUNGARIAN CASE
Provedor de dados: 31
Autores: Bakucs,   Lajos Zoltan; Ferto,   Imre.
The paper investigates the validity of Gibrat's Law in Hungarian agriculture. Employing various specifications including OLS, two-step Heckman model and quantile regressions our results strongly reject Gibrat’s Law for full sample. Estimations suggest that small farms tend to grow faster than larger ones. However, splitting the sample into two subgroups (corporate and family farms) we found different results. For family farms however, only OLS regression results reject Gibrat's Law, whilst the two-step Heckman models and quantile regression estimates support it. Finally, for corporate farms our results support the Law regardless of the method or size measure used. Our results indicate that there is no difference between family farms and corporate farms...
Tipo: Conference Paper or Presentation
Palavras-chave: Gibrat's Law; Selection bias; Quantile regression; Transition agriculture; Farm Management; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/7813

Instrumental variables and GMM: Estimation and testing
Provedor de dados: 31
Autores: Baum,   Christopher F.; Schaffer,   Mark E.; Stillman,   Steven.
We discuss instrumental variables (IV) estimation in the broader context of the generalized method of moments (GMM), and describe an extended IV estimation routine that provides GMM estimates as well as additional diagnostic tests. Stand-alone test procedures for heteroskedasticity, overidentification, and endogeneity in the IV context are also described.
Tipo: Journal Article
Palavras-chave: Instrumental variables; Generalized method of moments; Endogeneity; Heteroskedasticity; Overidentifying restrictions; Clustering; Intra-group correlation; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116029

TOWARDS MEASURING PRODUCER WELFARE UNDER OUTPUT PRICE UNCERTAINTY AND RISK NON-NEUTRALITY
Provedor de dados: 31
Autores: Bullock,   David S.; Shin,   Kie-Yup; Garcia,   Philip.
We combine theory with numerical integration methods to show that for any form of uncompensated supply, compensating variation of a change in higher moments of an output price distribution can be numerically derived.
Tipo: Conference Paper or Presentation
Palavras-chave: Producer welfare; Price uncertainty; Risk; Demand and Price Analysis; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1999
URL: http://purl.umn.edu/21713

fuzzy: A program for performing qualitative comparative analyses (QCA) in Stata
Provedor de dados: 31
Autores: Longest,   Kyle C.; Vaisey,   Stephen.
Qualitative comparative analysis (QCA) is an increasingly popular analytic strategy, with applications to numerous empirical fields. This article briefly discusses the substantive motivation and technical details of QCA, as well as fuzzy-set QCA, followed by an in-depth discussion of how the new program fuzzy performs these techniques in Stata. An empirical example is presented that demonstrates the full suite of tools contained within fuzzy, including creating configurations, performing a series of statistical tests of the configurations, and reducing the identified configurations.
Tipo: Article
Palavras-chave: Fuzzy; Cmvom; Cnfgen; Coincid; Coverage; Fzplot; Mavmb; Reduce; Setgen; Suffnec; Truthtab; Yavyb; Yvn; Yvo; Yvv; Yvy; Qualitative comparative analysis; QCA; Fuzzy sets; Boolean logic; Boolean data; Postestimation command; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120930

Derived Demand for Cattle Feeding Inputs
Provedor de dados: 31
Autores: Arnade,   Carlos Anthony; Mathews,   Kenneth H., Jr.; Jones,   Keithly G.
Derived demand relationships among four weight categories of feeder cattle entering Texas feedlots and feed were examined using a Generalized McFadden dual cost function specified as an error correction model.  Relationships among own- and cross-price elasticities provide evidence for at least two cattle feeding enterprises, feeding lightweight feeder cattle (calves) and feeding heavier cattle.  These results indicate systematic differences in demand relationships among the different weight classes, providing explanation and insight into mixed results from earlier studies.  Seasonality differed across weight categories, providing additional support for multiple cattle feeding enterprises.  A third step was added to the Engle-Granger two-step estimation...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19454

Key issues of linking models for policy impact assessment in agriculture
Provedor de dados: 31
Autores: Offermann,   Frank.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97706

OPTIMAL STRUCTURE OF AN AGRIBUSINESS FIRM CONSIDERING THE ECONOMICS OF MAJOR, LINKED COMPONENTS
Provedor de dados: 31
Autores: Ward,   Ruby A.; McCarl,   Bruce A.; Rister,   M. Edward; McCorkle,   Dean A.; Long,   Charles R.
An optimization model is used to evaluate the economics of various components of a large agribusiness.  The benefits of using interger programming are contrasted to traditional linear programming analysis in conjunction with outside-the-model budgeting analysis.
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20963

Hedging Effectiveness in a Vertical Marketing Channel for Two Periods
Provedor de dados: 31
Autores: Baldwin,   E. Dean; Irwin,   Scott H.; Ahmed,   Hassan; Rye,   Rob.
Tipo: Journal Article
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/60385

Valuing Western Australia’s Recreational Fisheries
Provedor de dados: 31
Autores: Zhang,   Jing; Hertzler,   Greg; Burton,   Michael P.
Australia by using the data from the newly finished National Survey of Recreational Fishing (2000/2001)(NSRF). There are a number of findings. 1. Socio-economic characteristics of anglers didn’t affect their catch of high quality fish (prize fish, reef fish or key-sport fish) as much as their catch of low quality fish (table fish and butter fish). 2. For a given trip, anglers were willing to pay $1.63, $26.03, $1.03 and $0.53 for the first prize fish, reef fish, key-sport fish or butter fish caught, respectively. 3. The top four valuable fishing sites in the survey period were Geraldton, Esperance, Albany and Broome, with annual access values of $6.45 million, $4.52 million, $3.47 million and $2.47 million, respectively. 4. The per trip estimates are of...
Tipo: Conference Paper or Presentation
Palavras-chave: Recreational fishing; Random utility model; Non-market valuation; Production Economics; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/58275

Deciding with long-term environmental impacts: what role for discounting?
Provedor de dados: 31
Autores: Schilizzi,   Steven.
The problem of how to discount values in the far future is reviewed, and shown to lead down a blind alley. An alternative is proposed that allows long term consequences to be addressed by decisions using a relatively short term time horizon. A simple model investigating the optimal containment of radioactive waste in a deterministic world is used to show that current generations can indeed cater for the interests of the far future while optimising over the short term; however, this is not always possible. The proposed method seems to address most of the critiques of long term discounting found in the literature.
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/58206

Should We Expect Government Policy to Be Pareto Efficient?: The Consequences of an Arrow-Debreu Economy with Violable Property Rights
Provedor de dados: 31
Autores: Bullock,   David S.
To address the question, "Should we expect government policy to be  efficient?" at its roots, I modify the well-known Arrow-Debreu  private ownership economy, allowing property rights to be violable.  The result is that equilibria tend to be Pareto inefficient.
Tipo: Conference Paper or Presentation
Palavras-chave: Pareto efficiency; Property rights; Research Methods/ Statistical Methods; D72; D78.
Ano: 2005
URL: http://purl.umn.edu/19444

Distinguishing Different Industry Technologies and Localized Technical Change
Provedor de dados: 31
Autores: Morrison Paul,   Catherine J.; Sauer,   Johannes.
When different technologies are present in an industry, assuming a homogeneous technology will lead to misleading implications about technical change and inefficient policy recommendations. In this paper a latent class modelling approach and flexible estimation of the production structure is used to distinguish different technologies for a representative sample of E.U. dairy producers, as an industry exhibiting significant structural changes and differences in production systems in the past decades. The model uses a transformation function to recognize multiple outputs; separate technological classes based on multiple characteristics, a flexible generalized linear functional form, a variety of inputs, and random effects to capture firm heterogeneity; and...
Tipo: Conference Paper or Presentation
Palavras-chave: Production Economics; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61146

Positive Mathematical Programming: a Comparison of Different Specification Rules
Provedor de dados: 31
Autores: Fragoso,   Rui Manuel de Sousa; Carvalho,   Maria Leonor da Silva; Henriques,   Pedro Damiao de Sousa.
In this paper, the prescriptive capacity of different types of positive mathematical programming models applied to the Alentejo agricultural sector is analysed. Model results are compared for 2000 and 2004 agricultural price and subsidies scenarios, regarding optimal combination of activities. Thus, it is tested, on one hand, models capacity to reproduce Alentejo agricultural sector behaviour, and by the other hand, their response and adjustment capacities to changes in prices and in agricultural policy.
Tipo: Conference Paper or Presentation
Palavras-chave: Positive mathematical programming; Agricultural supply; Alentejo; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/44242

Emission Permits Trade of Carbon Based on the Game Theory of Double Auction
Provedor de dados: 31
Autores: Liu,   Na; He,   Jixin; Hou,   Ning; Gu,   Kaiping.
As the world's largest carbon resources country with relatively great carbon emission, China in has just started its carbon trade. China is only a passive participant in international carbon trading market, rarely participating in the project of Clean Development Mechanism (CDM). Therefore, trade market of emission permits can be divided into first and second trade markets. During the definition of emission right, we found out that the ways of emission trade at second carbon trade market is the key to the research on carbon trade, which can realize the allocation efficiency and utilization efficiency of resources. Then, feasibility of implementing auction system of emission permits trade in China is analyzed from the aspects of legal protection, technical...
Tipo: Thesis or Dissertation
Palavras-chave: Carbon emission permits; Game theory; Nash Equilibrium; Allocation efficiency; China; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/56347

Evidence of Scope Economies in Australian Agriculture
Provedor de dados: 31
Autores: Villano,   Renato A.; Fleming,   Pauline; Fleming,   Euan M.
Scope economies can be used in studies of farming systems to provide a measure of synergies between different farm enterprises and between activities within farm enterprises. In this paper, they are reported for farms in three benchmarking groups in Australia by estimating stochastic input distance functions and calculating an 'economies of scope parameter'. Evidence of significant scope economies between sheep and crop enterprises, and between beef and crop enterprises, is presented and discussed. Similar evidence is reported between wool and lamb activities and wool and mature sheep trading activities within the sheep enterprise.
Tipo: Conference Paper or Presentation
Palavras-chave: Australia; Crops; Livestock; Sheep; Scope Economics; Crop Production/Industries; Livestock Production/Industries; Research Methods/ Statistical Methods; Industrial Organization.
Ano: 2008
URL: http://purl.umn.edu/5996

SEQUENTIAL INVESTMENT IN SITE-SPECIFIC CROP MANAGEMENT UNDER OUTPUT PRICE UNCERTAINTY: IMPLICATIONS FOR NITROGEN POLLUTION CONTROL
Provedor de dados: 31
Autores: Isik,   Murat; Khanna,   Madhu; Winter-Nelson,   Alex.
This paper develops an option value model to examine the extent to which output price uncertainty creates incentives to adopt two interrelated components of site-specific technologies sequentially. It analyzes how the impact of uncertainty on the sequential adoption decision differs across heterogeneous soil conditions, and examines the implications of adoption for nitrogen pollution generation and for the design of a cost-share subsidy policy.
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21875

Matching Diverse (Quality of) Supply with Market Differentiation Opportunities in the Pork Chain
Provedor de dados: 31
Autores: Trienekens,   Jacques H.
Currently, in most pork chains there is still a mismatch between delivered quality and expected quality, leading to unsatisfied customers and value losses because products are not sold against the best possible price. Differentiation of quality of pork starts already in the breeding stage, depends on feeding and living conditions of the animals at the farmer stage and is also influenced by the way the animals are transported and slaughtered. At the breeding stage a lot of research is being done that will eventually make it possible to use DNA technology to help guide breeding programs and to better predict the quality of animals and meat. However, because pigs are living creatures with a natural variation, 100% prediction accuracy is not to be expected and...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100470

Stata tip 14: Using value labels in expressions
Provedor de dados: 31
Autores: Higbee,   Kenneth.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116282

Capacity building for participatory irrigation management in Sindh Province of Pakistan.
Provedor de dados: 31
Autores: Memon,   Yameen; Talpur,   Mustafa; Murray-Rust,   Hammond.
Tipo: Working or Discussion Paper
Palavras-chave: River basins; Institutions; Organizations; Private sector; Public sector; Local government; Mapping; Water resource management; Water policy; Legislation; Rural women; Constraints; Groundwater; Surface water; Water quality; Water use; Water users; Dams; Reservoirs; Large-scale systems; Irrigation management; Industrialization; Case studies; Operations; Maintenance; Canals; Conflict; Farmer-agency interactions; Policy; Water supply; Rural development; Community/Rural/Urban Development; Farm Management; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2001
URL: http://purl.umn.edu/92769

After They Graduate: An Overview of the Iowa State University Alumni Survey
Provedor de dados: 31
Autores: Jolly,   Robert W.; Yu,   Li; Orazem,   Peter F.
Tipo: Working or Discussion Paper
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/48532

A BRIEF OVERVIEW OF NONPARAMETRIC METHODS IN ECONOMICS
Provedor de dados: 31
Autores: Hallam,   Arne.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/29001

Estimation of Asymmetric Price Adjustment in the U.S. Soybean Trade Using Rolling TAR: The Relation with Market Structure
Provedor de dados: 31
Autores: Nakajima,   Toru.
The threshold autoregressive (TAR) model by Enders and Granger (1998) and Enders and Siklos (2001) is a popular econometric model that estimates asymmetric price transmission (APT) with non-stationary time series data. However, empirical studies have not considered much the arbitrariness of sample period selection and possible temporal variation of parameters or asymmetry. The purpose of this study is to estimate the APT from the U.S. domestic soybean prices to the export prices using the TAR model, and to trace the changes of APT using rolling woindow methodology of TAR. Another purpose is to analyze the relation between the APT and the market structure in the world soybean trade. The hypothesis is that the APT was positive, which means that the U.S....
Tipo: Conference Paper or Presentation
Palavras-chave: Asymmetric price transmission; TAR model; Rolling window; U.S. soybeans; Market structure; Demand and Price Analysis; Industrial Organization; International Relations/Trade; Marketing; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103403

A New Approach to Correct for Hypothetical Bias in Stated Preference Models
Provedor de dados: 31
Autores: Davies,   Stephen P.; Loomis,   John B.
Many times economists are asked to estimate the demand for new consumer goods or services for which no market data exists. Typically market researchers and economists answer this challenge using surveys that ask about intended purchases (Louviere, et al. 2000) or what has become known as stated preference (SP) data.  Tying this data to revealed preference (RP), or actual behavior, has been a target in a number of studies.  Simplistic calibrations have been investigated in past RP-SP studies, such as Loomis, et al. 2001. This paper offers an alternative solution that allows the magnitude of the calibration correction to vary based on Klein and Sherman's (1997) Orbit procedure.  This paper extends the original Orbit procedure of Klein and Sherman by...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21204

Modeling Yeah- and Nay-Saying to Alternatives in Conjoint Experiments
Provedor de dados: 31
Autores: Hu,   Wuyang.
Using a series of hurdle choice models, this study considers both nay-saying and yeah-saying to alternatives offered in a conjoint experiment.  These behaviors are characterized by respondents persistently choosing the no-choice alternative or choosing at least one of the non-empty options offered in a survey.  Results show that jointly consider nay-saying and yeah-saying in a two-hurdle model drastically improves model fit; welfare implications based on hurdle models are also different from those based on models without hurdle specification.
Tipo: Conference Paper or Presentation
Palavras-chave: Conjoint experiment; Hurdle choice model; Yeah and nay-saying; Research Methods/ Statistical Methods; D12; C25.
Ano: 2008
URL: http://purl.umn.edu/6346

The impact of property rates on agricultural land, focusing on the Western Cape
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005.  This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58091

Returns to Scale of Production Function: Pooled, Within and Between Quantile Regression Approach
Provedor de dados: 31
Autores: Reimbaeva,   Maya; Shaik,   Saleem; Mishra,   Ashok K.
Tipo: Conference Paper or Presentation
Palavras-chave: Production function; Pooled; Between and Within Quantile Regression; Panel data; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/56563

The Effect of Increased Energy Prices on Agriculture: A Differential Supply Approach
Provedor de dados: 31
Autores: Moss,   Charles B.; Livanis,   Grigorios T.; Schmitz,   Andrew.
The increase in energy prices between 2004 and 2007 has several potential consequences for aggregate agriculture in the U.S. We estimate the derived input demand elasticities for energy as well as capital, labor, and materials using the differential supply formulation. Given that the derived input demand for energy is inelastic, it is more price-responsive than the other inputs. The results also indicate that the U.S. aggregate agricultural supply function is responsive to energy prices.
Tipo: Journal Article
Palavras-chave: Differential input demand; Concavity constrained; Energy; Agribusiness; Agricultural Finance; Demand and Price Analysis; Financial Economics; Industrial Organization; Labor and Human Capital; Land Economics/Use; Marketing; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; C30; Q11; Q42.
Ano: 2010
URL: http://purl.umn.edu/100514

EXPERIMENTAL METHODS IN AGRICULTURAL AND RESOURCE ECONOMICS: HOW USEFUL ARE THEY?
Provedor de dados: 31
Autores: Fisher,   Ann; Wheeler,   William J.; Zwick,   Rami.
Experimental economics has the potential to fill some of the gaps in the economist's tool kit.  This article describes experimental economics, its advantages and disadvantages, and why this tool might be a good choice in some situations.  The article summarizes the history of its use by agricultural and resource economists.  An illustrative example compares laboratory experiment data with survey data.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/31550

U.S. Import Demand for Tilapia from Selected FTAA Countries
Provedor de dados: 31
Autores: Ligeon,   Carel; Bayard,   Budry; Clark,   Joy M.; Jolly,   Curtis M.
Seafood consumption in the U.S. has increased over the period 1990 to 2003.  A large percentage of the seafood consumed in the U.S. is imported. The most important seafood products imported to the U.S. are shrimp, Atlantic salmon, tilapia, catfish, crayfish, mussels and a mixture of mollusks.  In 2003, the U.S. imported 199 million pounds of tilapia and tilapia products, at a value of $241.2 million, a 38% increase from the previous year.  The seafood market has been considered an important foreign exchange earner for the Caribbean Common Market (CARICOM), and Free Trade Area of the Americas (FTAA) member countries. Jamaica is the only CARICOM country that exports tilapia products from aquaculture sources to the U.S.  In 2003, Jamaica exported 39,950...
Tipo: Journal Article
Palavras-chave: Tilapia; Sea-food; Almost-Ideal-Demand-System; Import; FTAA countries; Agribusiness; Agricultural and Food Policy; Food Security and Poverty; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/36805

THE FUTURE OF THE WORLD SUGAR MARKET--A SPATIAL PRICE EQUILIBRIUM ANALYSIS
Provedor de dados: 31
Autores: Nolte,   Stephan.
A spatial price equilibrium (SPE) model of the world sugar market is programmed. The model covers more than hundred regions and contains sugar in as a sole product. It has a detailed coverage of policies and bilateral trade agreements. It is programmed as a mixed complementarity problem (MCP) in GAMS and uses the PATH solver. The SPE framework offers considerable advantages over other model approaches applied to the sugar market before. Four scenarios are simulated: A baseline scenario until 2015/16, accounting for implementation of the EU reform and market access commitments already decided upon. The liberalization scenarios include an implementation of the Falconer proposal for the current round of WTO negotiations, a full liberalization by the EU and a...
Tipo: Conference Paper or Presentation
Palavras-chave: Sugar; Partial Equilibrium Model; Spatial Price Equilibrium Model; MCP; Crop Production/Industries; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6663

EMPIRICAL MODELS, RULES, AND OPTIMIZATION: TURNING POSITIVE ECONOMICS ON ITS HEAD
Provedor de dados: 31
Autores: Cattaneo,   Andrea; Robinson,   Sherman.
This paper considers supply decisions by firms in a dynamic setting with adjustment costs and compares the behavior of an optimal control model to that of a rule-based system which relaxes the assumption that agents are explicit optimizers. In our approach, the economic agent uses believably simple rules in coping with complex situations. We estimate rules using an artificially generated sample obtained by running repeated simulations of a dynamic optimal control model of a firm’s hiring/firing decisions. We show that (i) agents using heuristics can behave as if they were seeking rationally to maximize their dynamic returns; (ii) the approach requires fewer behavioral assumptions relative to dynamic optimization and the assumptions made are based on...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/16270

predict and adjust with logistic regression
Provedor de dados: 31
Autores: Buis,   Maarten L.
Within Stata there are two ways of getting average predicted values for different groups after an estimation command: adjust and predict. After OLS regression (regress), these two ways give the same answer. However, after logistic regression, the average predicted probabilities differ. This article discusses where that difference comes from and the consequent subtle difference in interpretation.
Tipo: Article
Palavras-chave: Adjust; Predict; Logistic regression; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119270

DOES CONSISTENT AGGREGATION REALLY MATTER?
Provedor de dados: 31
Autores: Shumway,   C. Richard; Davis,   George C.
Consistent aggregation assures that behavioral properties, which apply to disaggregate relationships also, apply to aggregate relationships.  The agricultural economics literature is reviewed which has tested for consistent aggregation or measured statistical bias and/or inferential errors due to aggregation.  Tests for aggregation bias and errors of inference are conducted using indices previously tested for consistent aggregation. Failure to reject consistent aggregation in a partition did not entirely mitigate erroneous inference due to aggregation.  However, inferential errors due to aggregation were small relative to errors due to incorrect functional form or failure to account for time series properties of data.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/12966

Bernoulli Regression Models: Re-examining Statistical Models with Binary Dependent Variables
Provedor de dados: 31
Autores: Bergtold,   Jason S.; Spanos,   Aris.
The classical approach for specifying statistical models with binary dependent variables in econometrics using latent variables or threshold models can leave the model misspecified, resulting in biased and inconsistent estimates as well as erroneous inferences. Furthermore, methods for trying to alleviate such problems, such as univariate generalized linear models, have not provided an adequate alternative for ensuring the statistical adequacy of such models. The purpose of this paper is to re-examine the underlying probabilistic foundations of statistical models with binary dependent variables using the probabilistic reduction approach to provide an alternative approach for model specification. This re-examination leads to the development of the Bernoulli...
Tipo: Conference Paper or Presentation
Palavras-chave: Bernoulli Regression Model; Logistic regression; Generalized linear models; Discrete choice; Probabilistic reduction approach; Model specification; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19282

Generalized Lorenz curves and related graphs: an update for Stata 7
Provedor de dados: 31
Autores: Van Kerm,   Philippe; Jenkins,   Stephen P.
The glcurve command is updated to a Stata 7 version, glcurve7, which is described and illustrated.
Tipo: Journal Article
Palavras-chave: Generalized Lorenz curves; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115942

A Dynamic Approach to the FDI-Environment Nexus: The Case of China and India
Provedor de dados: 31
Autores: Baek,   Jungho; Koo,   Won W.
The cointegration analysis and a vector error-correction (VEC) model are applied to examine the short- and long-run relationships among foreign direct investment (FDI), economic growth, and the environment in China and India. The results show that FDI inflow plays a pivotal role in determining the short- and long-run movement of economic growth through capital accumulation and technical spillovers in the two countries. However, FDI inflow in both countries is found to have a detrimental effect on environmental quality in both the short- and long-run, supporting pollution haven hypothesis. Finally, it is found that, in the short-run, there exists a unidirectional causality from FDI inflow to economic growth and the environment in China and India - a change...
Tipo: Conference Paper or Presentation
Palavras-chave: China; Cointegration analysis; Environment; FDI; India; Vector error-correction; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6508

NONPARAMETRIC KERNEL ESTIMATION OF MULTIPLE HEDGE RATIOS
Provedor de dados: 31
Autores: Kim,   MinKyoung; Leuthold,   Raymond M.
It is possible for the traditional hedge ratio estimation to produce erroneous guidance to risk managers because of the restrictive assumptions.  This study adopts nonparametric locally polynomial kernel estimation to exclude the assumptions.  Results from the hog complex find that hedge ratios estimated by local polynomial kernel regression outperform naïve and GARCH models.  Because of the potential assumption violations associated with the estimation and implementation of hedge ratios by GARCH models, LPK is a reasonable alternative for estimating hedge ratios to manage price risks.
Tipo: Conference Paper or Presentation
Palavras-chave: Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/21737

Weather derivative design in agriculture – a case study of barley in the Southern Moravia Region
Provedor de dados: 31
Autores: Spicka,   Jindrich.
The aim of this paper is to point out some problems of index estimation for the purposes of weather derivative valuation considering the particularities of agriculture. The assessment of the sensitivity of barley to weather over 40 years has been the basis for the design and valuation of weather derivative in the Czech Republic (The Southern Moravia Region). The analysis is based on regression modeling using temperature index and barley yield. The burn analysis based on parametric bootstrap is used as the method for the valuation of weather derivative contract. With the effective bootstrap tool, the burn analysis may easily be processed and the uncertainty about the pay-off, option price and statistics of probability distribution of revenues can be...
Tipo: Journal Article
Palavras-chave: Weather derivative valuation; Agriculture; Risk management; Basis risk; Burn analysis; Agricultural and Food Policy; Research Methods/ Statistical Methods; Risk and Uncertainty; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/116383

MODELING MULTIVARIATE CROP YIELD DENSITIES WITH FREQUENT EXTREME EVENTS
Provedor de dados: 31
Autores: Chen,   Shu-Ling; Miranda,   Mario J.
Measuring the lower tail of a crop yield distribution is important for managing agricultural production risk and rating crop insurance.  Common parametric techniques encounter difficulties when attempting to model extreme yield events.  We evaluate and compare alternative models based on our candidate distributions for high risk counties.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19970

The regression-calibration method for fitting generalized linear models with additive measurement error
Provedor de dados: 31
Autores: Hardin,   James W.; Schmiediche,   Henrik; Carroll,   Raymond J.
This paper discusses and illustrates the method of regression calibration. This is a straightforward technique for fitting models with additive measurement error. We present this discussion in terms of generalized linear models (GLMs) following the notation defined in Hardin and Carroll (2003). Discussion will include specified measurement error, measurement error estimated by replicate error-prone proxies, and measurement error estimated by instrumental variables. The discussion focuses on software developed as part of a small business innovation research (SBIR) grant from the National Institutes of Health (NIH).
Tipo: Journal Article
Palavras-chave: Regression calibration; Measurement error; Instrumental variables; Replicate measures; Generalized linear models; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116180

Stata tip 13: generate and replace use the current sort order
Provedor de dados: 31
Autores: Newson,   Roger.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116281

A STATISTICAL ANALYSIS OF A PILOT SURVEY OF SALT-AFFECTED DAIRY FARMS
Provedor de dados: 31
Autores: Alaouze,   Chris M.; Read,   Michael; Sturgess,   Neil H.
A small stratified sample was drawn from irrigated dairy farms judged to exhibit two degrees (high and low) of salting in the soil. Cobb-Douglas production functions were fitted to time series and cross sectional data for each stratum. The results support the conclusion that the data from the two strata can be pooled and that the quality of the soil in this area can be modelled using an analysis of covariance approach. A preliminary confidence interval for the geometric mean of the ratio of the shadow price of water to the price of butterfat for farms in the sample was also calculated. This interval supports the hypothesis that rationed irrigation water is worth more to these farms than the price paid.
Tipo: Journal Article
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/22512

SIMULATED MAXIMUM LIKELIHOOD FOR DOUBLE-BOUNDED REFERENDUM MODELS
Provedor de dados: 31
Autores: Riddel,   Mary C.
Although joint estimation of referendum-type contingent value (CV) survey responses using maximum-likelihood models is preferred to single-equation estimation, it has been largely disregarded because estimation involves evaluating multivariate normal probabilities.  New developments in the construction of probability simulators have addressed this problem, and simulated maximum likelihood (SML) for multiple-good models is now possible.  This analysis applies SML for a three-good model under a double-bounded questioning format.  Results indicate joint estimation substantially improves the variances of the parameters and willingness-to-pay estimates.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/31040

Rural Broadband Internet Access Supply and Demand
Provedor de dados: 31
Autores: Stenberg,   Peter L.; Morehart,   Mitchell J.
Internet use has grown rapidly over the last 15 years and so has its integration into the rural economy. Connecting to the Internet via high-speed technology such as DSL lines, cable, satellite, and wireless networks increases bandwidth and makes the Internet much more useful to businesses, households, and governments. Rural households are almost as likely as urban households to use the Internet.  Broadband Internet access in rural areas has been less prevalent than in much more densely populated areas of the country.  Evidence suggests that the difference may lie in the higher cost or less availability of broadband Internet access in rural areas.   The paucity of national geographically-specific data, however, presents a challenge in trying to analyze...
Tipo: Conference Paper or Presentation
Palavras-chave: Broadband Internet access; Rural communities; Farm communities; Community/Rural/Urban Development; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; O33; R0.
Ano: 2009
URL: http://purl.umn.edu/49361

Multivariate probit regression using simulated maximum likelihood
Provedor de dados: 31
Autores: Cappellari,   Lorenzo; Jenkins,   Stephen P.
We discuss the application of the GHK simulation method for maximum likelihood estimation of the multivariate probit regression model and describe and illustrate a Stata program mvprobit for this purpose.
Tipo: Journal Article
Palavras-chave: Maximum likelihood estimation; Multivariate probit regression model; GHK; Mvprobit; Mvppred; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116115

Two Sides of the Same Coin? Analysis of the Web-Based Social Media with Regard to the Image of the Agri-Food Sector in Germany
Provedor de dados: 31
Autores: Boehm,   Justus; Kayser,   Maike; Spiller,   Achim.
Never before has food been as safe and secure as it is today, but simultaneously, society has become increasingly critical towards agricultural and food related issues. This two-sided development between society and agribusiness will be analyzed using Framing Theory. A quantitative semantic analysis was applied to evaluate the web-based social media in Germany. 50,931 web posts were collected covering 21 issues identified as relevant for the agri-food sector. The results show that all contentious issues are mainly framed in a two-sided way. The modern productivity-driven industry is judged as a negative development, trends returning to a more natural food production are seen as positive.
Tipo: Journal Article
Palavras-chave: Agri-food industry; Framing; Image; Issue management; Social media; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/97029

Farm Cost Allocation Based on the Maximum Entropy Methodology - The Case of Saskatchewan Crop Farms
Provedor de dados: 31
Autores: Peeters,   Ludo; Surry,   Yves R.
Agriculture and Agri-Food Canada (AAFC) has an ongoing research program to provide information on the effect of potential agricultural policy and technology scenarios on the environment and the economic conditions, behavior and performance in the agriculture sector. Included in this work program is a project to improve our farm level data on cost of production and farm management practices for economic and environmental analysis. As part of this effort to improve our data, this report evaluates an analytical method, called Maximum Entropy (ME), for its effectiveness in extracting detailed, enterprise level, cost of production information from whole-farm data. The ME method has been shown to be a promising and cost-effective option for obtaining these...
Tipo: Report
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/54461

ESTIMATION OF EXTERNAL COSTS OF ELECTRICITY GENERATION USING EXTERNE MODEL
Provedor de dados: 31
Autores: Molnar,   Sandor; Debrecin,   N.; Kovacevic,   T.; Molnar,   Melinda.
The external costs of electricity generation can be characterised by the resulting social and environmental impacts. The most significant impacts are the air pollutions impact on health, built in environment, crops, forests, agricultural areas and on global warming. The primary impact considered is the air pollution’s effect on human health. The monetised value of the health impact, the external costs are calculated for two regional coal power plants, the effects are examined on the EU level with the ExternE methodology.
Tipo: Journal Article
Palavras-chave: External costs; Human health; Monetized environmental impacts; Energy production; Coal power plants; Air pollution; Environmental Economics and Policy; Health Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/47553

strbee: Randomization-based efficacy estimator
Provedor de dados: 31
Autores: White,   Ian R.; Walker,   Sarah; Babiker,   Abdel.
strbee analyzes a two-group clinical trial with a survival outcome, in which some subjects may “crossover” to receive the treatment of the other arm. Adjustment for treatment crossover is done by a randomization-respecting method that preserves the intention-to-treat p-value.
Tipo: Journal Article
Palavras-chave: Clinical trials; Treatment changes; Randomization-respecting; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115957

LINEAR PROGRAMMING AS A TOOL FOR AGRICULTURAL SECTOR ANALYSIS
Provedor de dados: 31
Autores: Walker,   Neal; Monypenny,   Richard.
As sector programming models have increased in number, they have also increased, individually, in size and complexity. This increased sophistication has presented to researchers well-defined and difficult choices, the resolution of which usually involves compromise of either model generality or theoretical rigor. This paper discusses problems typical of those encountered in construction of large-scale programming models, and presents an overview of the goals of such models and the uses to which they have been applied.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1976
URL: http://purl.umn.edu/9167

What's the Use? Welfare Estimates from Revealed Preference Models when Weak Complementarity does not Hold
Provedor de dados: 31
Autores: Herriges,   Joseph A.; Kling,   Catherine L.; Phaneuf,   Daniel J.
The focal point of the revealed preference (RP) valuation literature, including recreation demand and random utility maximization (RUM) models, has been on eliciting the "use" value associated with environmental amenities; i.e., that portion of value associated with direct use of a resource. Maler's (1974) concept of weak complementarity is typically invoked to justify this focus. Indeed, weak complementarity explicitly or implicitly underlies most of the RP literature. In this paper, we consider the measurement of welfare in RP models when weak complementarity does not hold. In particular, the Kuhn-Tucker (KT) framework (e.g., Phaneuf et al. 2000) does not impose weak complementarity a priori, raising the possibility of rejecting weakly complementary in...
Tipo: Working or Discussion Paper
Palavras-chave: Revealed preference; Valuation; Weak complementarity; Use value; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/18341

AN EXPERIMENTAL EXAMINATION OF COMMON AGENCY
Provedor de dados: 31
Autores: Alevy,   Jonathan E.
An equilibrium solution is developed for a common-agency game that is used to study the structure of regulatory bureaucracy. Contrary to existing results, this equilibrium maintains powerful incentives for the agent.  An experiment is conducted to test the competing hypotheses. The implications of common-agency on reciprocity are also examined.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19876

THE 'MILK QUOTAS RENT PUZZLE' IN THE EU: ECONOMIC SIGNIFICANCE, REVIEW, AND POLICY RELEVANCE
Provedor de dados: 31
Autores: Jongeneel,   Roelof A.; Tonini,   Axel.
In the so-called Common Agricultural Policy (CAP) 'Health Check' the European Commission has recently proposed gradual transitional measures to allow a 'soft landing' of the milk sector to quota expiry. The aim of this paper is to support policy makers to get better insights in the implications of some of the most important economic assumptions and empirical choices made in partial equilibrium models focusing on dairy. Three partial equilibrium models are considered: the Agricultural Member states MODeling (AGMEMOD) model, the Common Agricultural Policy SIMulation (CAPSIM) model, and the European Dairy Industry Model (EDIM). The paper analyzes how the most important economic supply components, as they are part of the three key dairy models, affect milk...
Tipo: Conference Paper or Presentation
Palavras-chave: Milk quota rents; Supply response; Shifters; Dairy policy; Equilibrium models.; Agricultural and Food Policy; Political Economy; Research Methods/ Statistical Methods; C01; C02; Q12; Q13.
Ano: 2008
URL: http://purl.umn.edu/44796

A VERSENYKÉPESSÉG ELMÉLETE ÉS GYAKORLATA
Provedor de dados: 31
Autores: Jambor,   Attila.
Nowadays libraries are full of books on the theory of competitiveness and its measurement possibilities. There is even no accordance, however, among scientists regarding definition and measurement. Large number of approaches and hundreds of measures show the difficulty to exactly define what we mean by competitiveness. Moreover, works summarizing and grouping briefly main lines and measures in the literature are scarce. The aim of this study is to fill this gap, that is, to create a comprehensive report on traditional and innovative theories and measures of competitiveness. The study would like to serve as a theoretical background for enquirers of the topic and for those like to use theoretical approaches in practice when making their own analysis.
Tipo: Book
Palavras-chave: Tradícionális és innovative mutatószám rendszer; Pozitív és negatív megközelítés; Traditioanl and innovative measuring methods; Pozitive and negative attitudes; Financial Economics; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43314

Bootstrapping a conditional moments test for normality after tobit estimation
Provedor de dados: 31
Autores: Drukker,   David M.
Categorical and limited dependent variable models are routinely estimated via maximum likelihood. It is well-known that the ML estimates of the parameters are inconsistent if the distribution or the skedastic component is misspecified. When conditional moment tests were first developed by Newey (1985) and Tauchen (1985), they appeared to offer a wide range of easy-to-compute specification tests for categorical and limited dependent variable models estimated by maximum likelihood. However, subsequent studies found that using the asymptotic critical values produced severe size distortions. This paper presents simulation evidence that the standard conditional moment test for normality after tobit estimation has essentially no size distortion and reasonable...
Tipo: Journal Article
Palavras-chave: Conditional moment tests; Bootstrap; Tobit; Normality; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115956

ENTROPY-BASED SEEMINGLY UNRELATED REGRESSION
Provedor de dados: 31
Autores: Harmon,   Alice; Preckel,   Paul V.; Eales,   James S.
We adapt the classical SUR procedure to a minimum cross entropy approach to estimate linear systems of equations where the errors across equations are correlated.  We conclude that our entropy-based approach may provide a reasonable substitute for SUR in cases where classical methods may not be applied due to shortages of data.
Tipo: Working or Discussion Paper
Palavras-chave: Entropy; Econometrics; Seemingly unrelated regression; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/28682

A Better Approach to Resolving Variable Selection Uncertainty in Meta Analysis for Benefits Transfer
Provedor de dados: 31
Autores: Randall,   Alan; Chen,   Ding-Rong.
Because original high-quality non-market valuation studies can be expensive, perhaps prohibitively so, benefits transfer (BT) approaches are often used for valuing, e.g., the outputs of multifunctional agriculture. Here we focus on the use of BT functions, a preferred method, and address an under-appreciated problem – variable selection uncertainty – and demonstrate a conceptually superior method of resolving it. We show that the standard method of value-function BT, using the full estimated model, may generate BT values that are too sensitive to insignificant variables, whereas models reduced by backward elimination of insignificant variables pay no attention to insignificant variables that may in fact have some influence on values. Rather than searching...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/114788

DEVELOPING A DEMAND REVEALING MARKET CRITERION FOR CONTINGENT VALUATION VALIDITY TESTS
Provedor de dados: 31
Autores: Rondeau,   Daniel; Poe,   Gregory L.; Schulze,   William D.
Past research suggests that contingent valuation overstates demand for public goods. These estimates of hypothetical bias are probably invalid since they rely on voluntary contributions mechanisms which fail to reveal demand. An improved mechanism is shown to reveal aggregate demand in controlled experiments. However, individual contributions deviate from induced value.  Key Words: contingent valuation, voluntary contributions, provision point, experiments JEL Codes: H41, C92, Q20
Tipo: Working or Discussion Paper
Palavras-chave: Contingent valuation; Voluntary contributions; Provision point; Experiments; Research Methods/ Statistical Methods; H41; C92; Q20.
Ano: 1996
URL: http://purl.umn.edu/6856

On the Use of Multi-Unit Auctions in Measuring Consumers’ Willingness to Pay for Food Products
Provedor de dados: 31
Autores: Akaichi,   Faiçal; Nayga,   Rodolfo M., Jr.; Gil,   Jose Maria.
This paper proposes the use of multi-unit auctions in studying consumers’ willingness to pay (WTP) for food products in a multi-unit shopping scenario. We show how this method can overcome the limitations of single-unit experimental auctions in obtaining useful information related to WTP for not just the first unit but also subsequent units of a product, the demand curve, consumer surplus, the determinants of consumers’ WTP for each auctioned unit, and the effect of potential price discount strategies.
Tipo: Conference Paper or Presentation
Palavras-chave: Multi-unit auctions; Willingness to pay; Demand curve; Consumer surplus; Price discounts.; Agribusiness; Consumer/Household Economics; Marketing; Research Methods/ Statistical Methods; C91; D12; D44; M31.
Ano: 2010
URL: http://purl.umn.edu/60983

Generality of the relationship between attributions and depression across attributional dimensions and across samples
Provedor de dados: 31
Autores: Persons,   Jacqueline B.; Perloff,   Jeffrey M.
Two hypotheses implicit in the use of composite measures of attributions in tests of learned helplessness theory (but not implicit in the theory itself) were tested: the hypotheses that relationships between depression and the three types of attributions are equal in magnitude, and linear. To test these hypotheses, data from three published studies of the reformulated learned helplessness theory of depression (Abramson, Seligman, &amp; Teasdale, 1978) were reanalyzed. The hypothesis that internal, stable, and global attributions are equally related to depression was tested and rejected. Increases in internal attributions were related to depression in one sample: increases in global attributions for negative events were related to depression in two samples:...
Tipo: Working or Discussion Paper
Palavras-chave: Mathematical models; Sociology; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/47042

Location differences in communities’ preferences for environmental improvements in selected NSW catchments: A Choice Modelling approach
Provedor de dados: 31
Autores: Mazur,   Kasia; Bennett,   Jeffrey W.
To elicit household willingness to pay (WTP) for improvements in environmental quality in three NSW catchments (Lachlan, Namoi and Hawkesbury-Nepean), a choice modelling (CM) study was conducted.  This report presents results of research designed to investigate variations in WTP across different communities. The communities included local residents, distant/urban and distant/rural residents. Nine split samples were established to test for ‘location effects’. The analysis involved both conditional logit and random-parameters logit models.   Natural resource management (NRM), including Catchment Management Authorities (CMAs), can use the non-market values obtained from this study to guide their investment decisions.
Tipo: Report
Palavras-chave: Choice modelling; Location effects; Non-market valuation; Catchment planning; Environment; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94821

Identifying barriers and opportunities for transitions towards more sustainable agriculture through system analysis. The case of Vereda La Hoya, Colombia
Provedor de dados: 31
Autores: Feola,   Giuseppe; Schoell,   Regina; Binder,   Claudia R.
9th European International Farming System Association Symposium
Tipo: Conference Paper or Presentation
Palavras-chave: Pesticide use; Personal protective equipment; Sustainability transition; Structural Mental Model Approach; Integrative Agent‐Centred framework; Colombia; Crop Production/Industries; Environmental Economics and Policy; Health Economics and Policy; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/117781

FORECASTING MODELS IN MANAGEMENT
Provedor de dados: 31
Autores: Sindelar,   Jiri.
This article deals with the problems of forecasting models. First part of the article is dedicated to definition of the relevant areas (vertical and horizontal pillar of definition) and then the forecasting model itself is defined; as article presents theoretical background for further primary research, this definition is crucial. Finally the position of forecasting models within the management system is identified. The paper is a part of the outputs of FEM CULS grant no. 1312/11/3121.
Tipo: Book
Palavras-chave: Management tools; Subjective and objective methods; Managerial process; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43331

COMMODITY PRICES AND UNIT ROOT TESTS
Provedor de dados: 31
Autores: Wang,   Dabin; Tomek,   William G.
Endogenous variables in structural models of agricultural commodity markets are typically treated as stationary.  Yet, tests for unit roots have rather frequently implied that commodity prices are not stationary.  This seeming inconsistency is investigated by focusing on alternative specifications of unit root tests. We apply various specifications to Illinois farm prices of corn, soybeans, barrows and gilts, and milk for the 1960 through 2002 time span.  The preponderance of the evidence suggests that nominal prices do not have unit roots, but under certain specifications, the null hypothesis of a unit root cannot be rejected, particularly when the logarithms of prices are used.  If the test specification does not account for a structural change that...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20141

COMBINING ANNUAL ECONOMETRIC FORECASTS WITH QUARTERLY ARIMA FROECASTS:  A HEURISTIC APPROACH
Provedor de dados: 31
Autores: Myer,   Gordon L.; Yanagida,   John F.
Data limitations often limit the time framework in which agricultural commodities are modeled and prices forecasted.  Our research provides a technique to alleviate this constraint.  By combining an annual econometric model with a quarterly ARIMA model, quarterly forecasts can be made which utilize the theoretical and structural foundations in econometric modeling.
Tipo: Journal Article
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/32375

Principais pesquisas agropecuárias por amostragem probabilística no IBGE desde 1971: Histórico e perspectivas.
Provedor de dados: 31
Autores: Guedes,   Carlos Alfredo Barreto; Perruso,   Julio Cesar; Lauria,   Carlos Alberto; Bolliger,   Flavio Pinto.
Este trabalho tem como objetivos o levantamento de todas as pesquisas agropecuárias por amostragem probabilística implantadas no IBGE, discutindo-se os sucessos e fracassos ocorridos, sobretudo quanto aos aspectos gerenciais, bem como projetar perspectivas futuras. A data início de referência deste trabalho é coincidente com a criação da CEPAGRO (Comissão Especial de Planejamento, Controle e Avaliação das Estatísticas Agropecuárias) em 1971, um marco histórico para as estatísticas agropecuárias no IBGE. Neste período, ocorreram 15 eventos (11 pesquisas e 4 tentativas) ligados a investigações por amostragem probabilística do setor agropecuário no IBGE, o que não é, em absoluto, algo desprezível. Sob esta ótica, foi possível constatar que a falta de recursos...
Tipo: Conference Paper or Presentation
Palavras-chave: Amostragem probabilística; Estatística; Pesquisa agropecuária; IBGE; Probabilistic sampling; Statistics; Agricultural surveys; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/109753

Foreword and Introduction
Provedor de dados: 31
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/95542

A Comparison of Approaches to Mitigate Hypothetical Bias
Provedor de dados: 31
Autores: Champ,   Patricia A.; Moore,   Rebecca; Bishop,   Richard C.
We compare two approaches to mitigating hypothetical bias. The study design includes three treatments: an actual payment treatment, a contingent valuation (CV) treatment with a follow-up certainty question, and a CV treatment with a cheap talk script. Our results suggest that both the follow-up certainty treatment and the cheap talk treatment produce willingness-to-pay (WTP) estimates consistent with the actual payment treatment. However, the follow-up certainty treatment provides response distributions at all offer amounts that are statistically similar to the actual payment treatment, while the cheap talk treatment provides similar responses only at some offer amounts. Furthermore, the cheap talk treatment is effective only for inexperienced individuals....
Tipo: Journal Article
Palavras-chave: Contingent valuation; Hypothetical bias; Follow-up certainty; Cheap talk; Nonmarket valuation; Environmental Economics and Policy; Public Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/55867

Prices versus Quantities Reconsidered
Provedor de dados: 31
Autores: Brozovic,   Nicholas; Sunding,   David L.; Zilberman,   David.
In comparing second-best prices and quantities, studies assume that quantities bind with probability one.  We present a more general and realistic model of second-best regulation where quantity instruments can bind with probability less than one.  This additional flexibility of quantity instruments makes them much more efficient than previously realized.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20257

Local Food Marketing: Factors for Growth of Small Agri‐food Businesses in the UK
Provedor de dados: 31
Autores: Hingley,   Martin; Boone,   Julie; Haley,   Simon.
This study aims to understand local food and explore the barriers to development for small innovative food businesses. Research was conducted through depth interviews and a survey in North‐West England. Results indicate that small business success can be subjective and performance dependent on business aims. Identified were issues concerning access to finance, burden of regulations and the need for support from industry networks and government. Lack of an official and recognised definition of the term “local food” had implications for marketing strategy. Small businesses recognise that customers are increasingly concerned with food provenance and traceability, but that they and their representative associations need to do more to make these links.
Tipo: Conference Paper or Presentation
Palavras-chave: Local; Food; Small‐business; Growth; UK; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100458

COMPARISON OF AGRICULTURAL FARM EFFICIENCY IN SLOVAK REGIONS BEFORE AND AFTER EU ACCESSION
Provedor de dados: 31
Autores: Sojkova,   Z.; Kropkova,   Z.; Kovae,   S.
This paper presents results of stochastic parametric approach used in estimation of farm technical efficiency. The estimation of output oriented technical efficiency was based on Stochastic Frontier analysis with Cobb-Douglas production function. Model specification for empirical application were employed Battese and Coelli 1995 model specification, where technical inefficiency effects are explicitly expressed as a function of a vector of firm-specific variables and random error and integrated in the stochastic frontier model. Model also included dummy variable which expressed production conditions in which Slovak farms are operating. We divided farms into two groups of production conditions: productive regions (PR) and less favorable area (LFA) regions....
Tipo: Conference Paper or Presentation
Palavras-chave: Less favorable area (LFA); Subsidy; Stochastic production frontier; Panel data; Output – oriented technical efficiency; Cobb-Douglas production function; Production Economics; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6462

ADAPTIVE TRUNCATED ESTIMATON APPLIED TO MAXIMUM ENTROPY
Provedor de dados: 31
Autores: Marsh,   Thomas L.; Mittelhammer,   Ronald C.
An adaptive estimator is proposed to optimally estimate unknown truncation points of the error support space for the general linear model.  The adaptive estimator is specified analytically to minimize a risk function based on the squared error loss measure.  It is then empirically applied to a generalized maximum entropy estimator of the linear model using bootstrapping, allowing the information set of the model itself to determine the truncation points.  Monte Carlo simulations are used to demonstrate performance of the adaptive entropy estimator relative to maximum entropy estimation coupled with alternative truncation rules and to ordinary least squares estimation. A food demand application is included to demonstrate practical implementation of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/36169

The Structure Model Based Determinants of Capital Structure: A Seemingly Unrelated Regression Model
Provedor de dados: 31
Autores: Yan,   Yan; Shi,   Xiangdong; Barry,   Peter J.; Paulson,   Nicholas D.; Sherrick,   Bruce J.
This study proposed a seemingly unrelated regression model to investigate the predicting capability of the structure model and test the capital structure theories. The model considered dynamic property of the structure model and characteristics of farm records. FBFM data are used in empirical analysis. The regression results provide new supportive evidence on capital theories.
Tipo: Conference Paper or Presentation
Palavras-chave: Structure Model; Capital Structure; Seemingly Unrelated Regression; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6171

Applying Geographically Weighted Regression to Conjoint Analysis: Empirical Findings from Urban Park Amenities
Provedor de dados: 31
Autores: Tanaka,   Katsuya; Yoshida,   Kentaro; Kawase,   Yasushi.
The objective of this study is to develop spatially-explicit choice model and investigate its validity and applicability in CA studies. This objective is achieved by applying locally-regressed geographically weighted regression (GWR) and GIS to survey data on hypothetical dogrun facilities (off-leash dog area) in urban recreational parks in Tokyo, Japan. Our results show that spatially-explicit conditional logit model developed in this study outperforms traditional model in terms of data fit and prediction accuracy. Our results also show that marginal willingness-to-pay for various attributes of dogrun facilities has significant spatial variation. Analytical procedure developed in this study can reveal spatially-varying individual preferences on attributes...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice experiments; Conjoint analysis; Dogrun; Geographically weighted regression; Spatial econometrics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6233

Exploring Scope and Scale Issues in Choice Modelling Design
Provedor de dados: 31
Autores: Rolfe,   John; Wang,   Xuehong.
The key tasks in the design of a choice modelling (CM) experiment are to define the scope, scale and frame of the tradeoffs presented to respondents. This study explores the scale and scope of choice tasks and then develops definitions of these terms. The scope of a good in a stated preference experiment refers to the dimensions used to define the good as well as the tradeoffs involved. The scale refers to the quantities involved. The framing refers to the context in which the choices are made. The discussion helps identify issues when setting the contingent market for a choice experiment.
Tipo: Report
Palavras-chave: Choice modelling; Scale; Scope; Framing; Embedding; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/94806

Pricing Games in Poultry Markets: The Cases of Eggs in Australia and Chicken in Canada
Provedor de dados: 31
Autores: Shank,   Benjamin; Goddard,   Ellen W.; Freebairn,   John W.; Griffith,   Garry R.
Given the increasing concentration in numerous markets recent interest in market structure and performance has grown dramatically. The empirical research revolves around theories of industrial organization and non-cooperative game theory. Research in this area uses participant strategic action not only to define market structure but also participant conduct. In the Australian egg market and Canadian fresh chicken market we reject the more competitive assumption of Bertrand-Nash behavior in favor of Stackelberg/leader-follower relationships. In Australia Pace Farms emerges as the industry leader while in Canada generic product overwhelmingly controls the market.
Tipo: Conference Paper or Presentation
Palavras-chave: Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/59707

Public vs. Private Good Research at Land-Grant Universities
Provedor de dados: 31
Autores: Rausser,   Gordon C.; Simon,   Leo K.; Stevens,   Reid.
The basic concern of this paper is the effect of private sponsorship of university research on the allocation of expenditures between public good research and commercial applications. Throughout the land-grant university system, there is much concern that as a result of reduced government funding, fundamental research will be neglected at the expense of research that is geared toward commercial applications. This paper attempts to shed some light on the relationship between research priorities and the availability of public funding for university research. In particular, we use both a static and a dynamic model to investigate the conditions under which university/private research partnerships can "crowd-in" or "crowd-out" basic science research as public...
Tipo: Working or Discussion Paper
Palavras-chave: Land-grant colleges; Land-grant university; Research; Government aid; Scientific research; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43794

Organic Farming and the New CAP - Results for the Austrian Agricultural Sector
Provedor de dados: 31
Autores: Schmid,   Erwin; Sinabell,   Franz.
In 2003, the Common Agricultural Policy (CAP) has been reformed and decoupling direct payments from farm output is one of its core elements. We estimate the likely responses in organic product supply due to the reform at regional and sectoral levels. In addition, we analyse how the new programme for rural development, to be implemented in 2007, might affect organic farming. Our results show that organic farming will become more attractive after the 2003 CAP reform in Austria. Our results support the view that interactions among agri-environmental measures affect farmers' choice to maintain, abandon or adopt organic farming practices.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural sector modelling; Common Agricultural Policy; Organic farming; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q11; Q18; Q21.
Ano: 2005
URL: http://purl.umn.edu/24671

MOVING BEYOND CHALK AND TALK: USING PROBLEM-BASED-LEARNING IN A RESEARCH METHODS COURSE SEQUENCE
Provedor de dados: 31
Autores: Aull-Hyde,   Rhonda L.; Ilvento,   Thomas W.
The average adult can concentrate for only about eight to ten minutes during an hour-long lecture. Thus, students' ability to absorb information may be seriously impeded if we college professors talk nonstop. One alternative to the traditional "chalk and talk" instructional method is problem-based learning (PBL) - an instructional approach using real world problems as a format for students to acquire critical thinking, problem solving and group interaction skills. We describe how we transformed a two-course sequence in research methods into a problem-based-learning format. Student-reported benefits of the PBL approach include the need for higher-order thinking, improved group interaction skills, relevance of course material to real world situations, higher...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2002
URL: http://purl.umn.edu/15832

Incentive Compatibility in an Attribute-Based Referendum Model
Provedor de dados: 31
Autores: Racevskis,   Laila A.; Lupi,   Frank.
The manner in which WTP survey responses are elicited has received much attention in the nonmarket valuation literature because of the potential bias that may be introduced via alternate response formats.  One issue of particular concern is that of incentive compatibility. Several studies have concluded that response formats that present a series of valuation questions are not incentive compatible.  While the single dichotomous choice elicitation format reduces the amount of information collected, multiple-bounded elicitation formats may yield biased, unreliable results.  Understanding this trade-off can help provide better information on response formats that will elicit incentive compatible responses and therefore provide realistic and policy-relevant...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6477

Investigation of the factors influencing adoption of GM crops at country level
Provedor de dados: 31
Autores: Hall,   Clare; Toma,   Luiza; Moran,   Dominic.
With the possible exception of nuclear technology, few scientific breakthroughs have generated the level of emotive debate that has surrounded the roll-out of agricultural biotechnology. Initial discussion about the environmental impacts of agricultural genetic modification, are now frequently juxtaposed with counter-claims that the technologies could actually be part of a wider global environmental solution in relation to climate change mitigation and food shortages. This study tests whether there are any consistent messages on why some countries seem to be advancing adoption of the technology, while others are not. We consider the range of claims in existing literature on adoption tendencies and then use structural equation modelling to test and estimate...
Tipo: Conference Paper or Presentation
Palavras-chave: Genetically modified crops; Structural equation model; Global adoption.; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Institutional and Behavioral Economics; International Relations/Trade; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/50366

FINITE SAMPLE PROPERTIES OF NONSTATIONARY BINARY RESPONSE MODELS: A MONTE CARLO AND RESPONSE SURFACE ANALYSIS
Provedor de dados: 31
Autores: Riddel,   Mary C.
This paper investigates the finite sample distributions of maximum likelihood estimators for nonstationary probit models.  We find that, analogous to standard OLS models, commonly used tests statistics almost always reject the null hypothesis of no relationship between xt and a latent yt, even when they are, in fact, generated by independent random walks.  However, if cointegrating relationships are present in the model, parameter distributions are better behaved and standard z and Wald test statistics are consistent.
Tipo: Conference Paper or Presentation
Palavras-chave: Binary choice; Probit models; Nonstationay processes; Research Methods/ Statistical Methods; C250.
Ano: 2000
URL: http://purl.umn.edu/21821

Control of Newcastle Disease in Village Chickens
Provedor de dados: 31
Autores: Centre for International Economics.
Between 1983 and 1992, the Australian Centre for International Agricultural Research (ACIAR) invested A$3 million in research to find a vaccine that could provide protection from Newcastle disease in chickens and be applied in village environments in developing countries. A further $160 000 was invested in follow up projects which ended in 1996. Village chickens often provide the only source of protein to poor villagers living in remote areas and Newcastle disease frequently devastates unvaccinated village flocks. The ACIAR-sponsored research was highly successful in developing a heat resistant vaccine (HRV4) which could be readily used in the field by coating it onto chicken feed. The vaccine was commercialised by an Australian company which subsequently...
Tipo: Book
Palavras-chave: Newcastle disease; Chickens; Poultry; Vaccine; Malaysia; Vietnam; ACIAR; Australia; Developing country; Village; Africa; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; International Development; Livestock Production/Industries; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/47190

Dynamic Contingent Valuation and Choice Modelling for Ecosystem Services
Provedor de dados: 31
Autores: Hertzler,   Greg.
Non market valuation and bio economic modelling are combined in a dynamic model of ecosystem services. A mathematical proof demonstrates that the imputed price of natural capital contains all non market values and that scarcity rent is the total value of ecosystem services. A dynamic demand system, including characteristics is derived. New methods are developed for dynamic welfare analysis and both revealed and stated preference methods are proposed for estimating the price of natural capital. Estimation is simple if we avoid surveying consumers who degrade the ecosystem and instead consult owners who accrue the scarcity rent and conserve for the future.
Tipo: Conference Paper or Presentation
Palavras-chave: Non market valuation; Ecosystem services; Lancaster demand; Welfare analysis; Analytical solutions; Demand and Price Analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q57; Q51; Q56.
Ano: 2008
URL: http://purl.umn.edu/6024

SURVEYING FARMERS: A RESEARCH NOTE
Provedor de dados: 31
Autores: Pennings,   Joost M.E.; Irwin,   Scott H.; Good,   Darrel L.
Mail surveys are a very popular instrument for researchers as well as government agencies and commercial firms to obtain information about farmers.  A large percentage of farmers do not respond to these mail surveys.  To gain insight into why farmers do not respond and their preferences regarding mail surveys, farmers who did not respond to a mail survey were interviewed.  From our field study it appears that a large proportion does not even read the questionnaire.  Furthermore, the period in which the survey is sent along with the form and amount of compensation, the sender of the questionnaire, and the length of the questionnaire has a crucial impact on the willingness to participate.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/14781

The birth of the bulletin
Provedor de dados: 31
Autores: Hilbe,   Joseph M.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117496

A Framework for Assessing of the Impact of Capacity Building
Provedor de dados: 31
Autores: Templeton,   Deborah J.
Capacity building is widely recognised as an important component of most research-for-development activities. However despite the fact that around $15 billion is spent annually on capacity building activities, there has been limited assessment of the economic returns to that investment. In recent years, the Impact Assessment Program of the Australian Centre for International Agricultural Research has turned its attention to quantifying the benefits from capacity-building. This paper sets out a framework for assessing of the impact of capacity building and presents four case studies. It does not purport to be a definitive paper by any means. Rather, it is an account of just one organisations experience. It is hoped that as work on this important area...
Tipo: Conference Paper or Presentation
Palavras-chave: Capacity building; Impact assessment; Attribution; International Development; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/51716

Stata tip 59: Plotting on any transformed scale
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120939

Using Surveys to Compare the Public's and Decision-makers' Preferences for Urban Regeneration: The Venice Arsenale
Provedor de dados: 31
Autores: Alberini,   Anna; Longo,   Alberto; Riganti,   Patrizia.
In this paper, we illustrate how surveys can be used to elicit the preferences of the public and of policymakers and city officials for regeneration projects at urban sites. Our methodology uses rating exercises, coupled with conjoint-choice stated preferences for the general public and with ranking exercises for the public officials and other stakeholders, and is then applied to investigate alternative reuses of the Venice Arsenale, Italy, and their economic, environmental and social impacts. One interesting feature of the conjoint choice questions for members of the public is that the responses to these questions can be used to estimate the social benefits of regeneration projects, i.e., how much people are willing to pay for these urban transformations....
Tipo: Working or Discussion Paper
Palavras-chave: Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/12221

CLIMATE CHANGE AND AGRICULTURAL PRODUCTIVITY IN SUB-SAHARAN AFRICA: A SPATIAL SAMPLE SELECTION MODEL
Provedor de dados: 31
Autores: Ward,   Patrick S.; Florax,   Raymond J.G.M.; Flores-Lagunes,   Alfonso.
Using data at a high spatial resolution, we estimate a cereal yield response function conditional upon climatological and topographical features using a recently developed estimator for spatial process models when sample selection is of concern. We control for localized spatial correlation in unobserved disturbances affecting both the selection to plant cereals as well as in the resulting conditional yield response. We find that cereal yields across Sub-Saharan Africa will decline with increasing temperatures resulting from global climate change, and that failing to control for sample selection leads to underestimation of these adverse effects.
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural productivity; Climate change; Spatial econometrics; Sample selection; Generalized method of moments; Land Economics/Use; Productivity Analysis; Research Methods/ Statistical Methods; C31; Q18; C50.
Ano: 2011
URL: http://purl.umn.edu/116182

MISSPECIFICATION IN SIMULTANEOUS SYSTEMS: AN ALTERNATIVE TEST AND ITS APPLICATION TO A MODEL OF THE SHRIMP MARKET
Provedor de dados: 31
Autores: Lea,   J.D.; Shonkwiler,   John Scott.
Concern over the effects of public policies based on misspecified econometric models motivates interest in a procedure to test, diagnose, and improve the specification of models that have been estimated with three-stage least squares.  A test of system-wide specification based on Hausman's specification test is employed in a test of the a priori restrictions placed on the parameters of a structural model of the U.S. shrimp market.  The null hypothesis of proper specification is rejected.  After diagnosis via a comparison of unrestricted and restricted reduced forms and respecification, the null hypothesis cannot be rejected.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/29267

OS PILARES DA QUALIDADE: O PROCESSO DE IMPLEMENTAÇÃO DO PROGRAMA DE QUALIDADE DO CAFÉ (PQC)
Provedor de dados: 31
Autores: Montagnana Vicente Leme,   Paulo Henrique; Machado,   Rosa Teresa Moreira.
The present study had as major objective to analyze the implementation process of the coffee quality program (CQP) and its implications on the roasted and ground coffee companies in Brazil. Firstly, the philosophy and the objectives of CQP were described in the construction of a theoretical analysis model, the “quality pillars”. The marketing strategies of thirteen roasters were analyzed. Research data were analyzed with the support of the “quality pillars” model: product quality, process quality, and the quality signal. As main results, it was possible to imply that quality was the main factor that increased the vertical coordination between the researched companies. Therefore, CQP implementation leads companies to the adoption of vertical coordination...
Tipo: Journal Article
Palavras-chave: Café; Qualidade; Certificação; Padronização; Coffee; Quality; Certification; Standardization; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2010
URL: http://purl.umn.edu/102013

Forecasting with X-12-ARIMA: International tourist arrivals to India and Thailand
Provedor de dados: 31
Autores: Balogh,   Peter; Kovacs,   Sandor; Chaiboonsri,   Chukiat; Chaitip,   Prasert.
Forecasting is an essential analytical tool in tourism policy and planning. This paper focuses on forecasting methods based on X-12-ARIMA seasonal adjustment and this method was developed by the Census Bureau in the United States. It has been continually improved since the 1960s, and it is used by many statistics agencies and central banks. The secondary data were used to produce forecasts of international tourist arrivals to India for 2007-2010 and also these data were used to produce forecasts of international tourist arrivals to Thailand for 2006-2010. From these period the results confirm that the best forecasting method based on the X-12-ARIMA seasonal adjustment is X-12-ARIMA(0,1,2)(0,1,1), X-12-ARIMA(0,1,1)(0,1,1) and X-12-ARIMA(2,1,0)(0,1,1) for...
Tipo: Journal Article
Palavras-chave: India; Thailand; International tourism; X-12-ARIMA; The best forecasting methods; Agricultural and Food Policy; International Development; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49226

Estimating Crop Rotations as Dynamic Cycles using Field Data
Provedor de dados: 31
Autores: MacEwan,   Duncan; Howitt,   Richard E.
Replaced with revised version of paper 07/24/11.
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; Production Economics; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103635

Benefits to Regional Pest Management: Estimating the Spatial Externalities of Conventional Pesticide Use On Beneficial Insects in the California Citrus Industry
Provedor de dados: 31
Autores: Grogan,   Kelly A.
Replaced with revised version of paper 08/06/10.
Tipo: Conference Paper or Presentation
Palavras-chave: Pesticide choice; Spatial externalities; Spatial econometrics; Agricultural and Food Policy; Crop Production/Industries; Production Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/61254

THE EFFECT OF THE NUMBER OF CHOICE SETS ON RESPONSES IN A STATED CHOICE SURVEY
Provedor de dados: 31
Autores: Heberling,   Matthew; Shortle,   James S.; Fisher,   Ann.
An important issue for the stated choice method is the effect of the number of choice sets on responses. Based on a study of this issue in a mailed survey, results indicate that the number of choice sets does not affect survey response rates or item non-response rates.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21832

APPROXIMATION APPROACHES TO PROBABILISTIC CHOICE SET MODELS FOR LARGE CHOICE SET DATA
Provedor de dados: 31
Autores: Kuriyama,   Koichi; Hanemann,   W. Michael; Pendleton,   Linwood.
Tipo: Working or Discussion Paper
Palavras-chave: Random utility model; Travel cost method; Recreation; Environmental valuation; Research Methods/ Statistical Methods; Q26.
Ano: 2003
URL: http://purl.umn.edu/6867

Conclusive Evidence on the Benefits of Temporal Disaggregation to Improve the Precision of Time Series Model Forecasts
Provedor de dados: 31
Autores: Ramirez,   Octavio A.
Simulation methods are used to measure the expected differentials between the Mean Square Errors of the forecasts from models based on temporally disaggregated versus aggregated data. This allows for novel comparisons including long-order ARMA models, such as those expected with weekly data, under realistic conditions where the parameter values have to be estimated. The ambivalence of past empirical evidence on the benefits of disaggregation is addressed by analyzing four different economic time series for which relatively large sample sizes are available. Because of this, a sufficient number of predictions can be considered to obtain conclusive results from out-of-sample forecasting contests. The validity of the conventional method for inferring the order...
Tipo: Presentation
Palavras-chave: Data Aggregation; Efficient Forecasting; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/123470

Black Sea Wheat Market Integration with the International Wheat Markets: Some Evidence from Co-integration Analysis
Provedor de dados: 31
Autores: Goychuk,   Kateryna; Meyers,   William H.
Replaced with revised version of paper 07/19/11.
Tipo: Conference Paper or Presentation
Palavras-chave: Price transmission; Market integration; Ukraine; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103894

Right-to-Choose Auctions: A Field Study of Water Markets in the Limari Valley of Chile
Provedor de dados: 31
Autores: Alevy,   Jonathan E.; Cristi,   Oscar; Melo,   Oscar.
Field experiments were conducted with farmers in the Limarí Valley of Chile to test extant theory on right-to-choose auctions. Water volumes that differed by reservoir source and time of availability were offered for sale by the research team. The auctions were supplemented by protocols to elicit risk and time preferences of bidders. We find that the right-to-choose auctions raise significantly more revenue than the benchmark sequential auction. Risk attitudes explain a substantial amount of the difference in bidding between auction institutions, consonant with received theory. The auction bidding revealed distinct preferences for water types, which has implications for market re-design.
Tipo: Journal Article
Palavras-chave: Water market; Field experiment; Auction design; Farm Management; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/90821

Energy Use in Agriculture: A Modeling Approach to Evaluate Energy Reduction Policies
Provedor de dados: 31
Autores: Kempen,   Markus; Kraenzlein,   Tim.
Agricultural production requires significant input of fossil fuels and other energy sources leading to negative external effects like emissions of CO2. Measures to discourage energy consumption in the agricultural sector are contemplated upon and might increase costs of production activities. At the same time, energy cost rise due to market developments, also affecting the relative competitiveness of agricultural activities in favor of low energy input sub-sectors. Increasing energy related cost could reduce total energy consumption, but the extent of the reduction is uncertain. The effects of increasing energy costs in EU27 on market quantities and prices as well as energy use in the agricultural sector will be investigated using the agricultural sector...
Tipo: Conference Paper or Presentation
Palavras-chave: Energy Use in Agriculture; Energy Cost; Agricultural Sector Model; Production Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6652

Running to Stand Still: Challenges Economists Face with Imperfect Data
Provedor de dados: 31
Autores: Kemper,   Nathan; Popp,   Jennie S. Hughes; Miller,   Wayne P.; Goodwin,   Harold L., Jr.
Some suggest that land application of phosphorus rich poultry litter has negatively affected area waters' recreational value.  However, key data are unavailable to conduct thorough economic analysis to aid in policy development.  This paper examines the challenges associated with using limited economic analyses to construct policy to address this situation.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/35315

Operational Models for Improving the Targeting Efficiency of Agricultural and Development Policies: A systematic comparison of different estimation methods using out-of-sample tests
Provedor de dados: 31
Autores: Houssou,   Nazaire; Zeller,   Manfred.
Accurate targeting is key for the success of any development policy. While a number of factors might explain low targeting efficiency such as governance failure, political interference or lack of political will, this paper focuses on improving indicator-based models that identify poor households and smallholder farmers more accurately.    Using stepwise regressions along with out-of-sample validation tests and receiver operating characteristic curves, this paper develops proxy means tests models for rural and urban Malawi. The models developed have proved their validity in an independent sample and therefore, can be used to target a wide range of development policies to the poor. This makes the models a potentially interesting policy tool for the country.
Tipo: Conference Paper or Presentation
Palavras-chave: Malawi; Poverty targeting; Predictions; Proxy means tests; Out-of-sample tests; ROC curve; Bootstrap; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Food Security and Poverty; International Development; Political Economy; Research Methods/ Statistical Methods; C01; C13; C51; C52; I3; I32; Q14.
Ano: 2009
URL: http://purl.umn.edu/51454

Getting Implicit Shadow Prices Right for the Estimation of the Malmquist Index: The Case of Agricultural Total Factor Productivity in Developing Countries
Provedor de dados: 31
Autores: Nin Pratt,   Alejandro; Yu,   Bingxin.
The Malmquist index has become extensively used in international comparisons of agricultural productivity since it does not require prices for its estimation, which are normally not available. However, the DEA approach used to estimate this index still uses implicit price information. This entails potential problems because these methods are susceptible to the effect of data noise, and shadow prices can prove to be inconsistent with prior knowledge on cost shares. In this paper we analyze implicit input shadow shares used in the DEA approach to estimate agricultural productivity using the Malmquist index for 72 developing countries. We then set bounds to the implicit input shares introducing information on their likely value and compare constrained and...
Tipo: Conference Paper or Presentation
Palavras-chave: Malmquist; Shadow prices; Total factor productivity; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; D2.
Ano: 2009
URL: http://purl.umn.edu/51797

The Dual Approach to Research Evaluation:A Simplified Empirical Illustration
Provedor de dados: 31
Autores: Hill,   Debbie J.; O'Donnell,   Christopher J.; Piggott,   Roley R.; Griffith,   Garry R.
In this paper, the dual approach to ex ante research evaluation in a multiple-input, multiple-output industry is explained and demonstrated. A simplified, illustrative model is developed based on a number of fundamental characteristics of the Australian wool industry and output-augmenting technical change. A normalised quadratic restricted profit function of Australian wool production is specified in terms of effective rather than actual prices. The estimated short-run supply elasticities are quite inelastic. The results of the simplified model show that the development and adoption of a 10 per cent yield-increasing wool technology would result in a 19.6 per cent fall in the actual price of wool and a 9.8 per cent increase in the actual quantity of wool...
Tipo: Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/123661

MENUING SOFTWARE: APPLICATION TO THE GENERAL MANAGER'S NEED
Provedor de dados: 31
Autores: Fuller,   Earl I.
This paper demonstrates a robust approach to general manager computer use.  The approach is shown to systematically integrate a diverse collection of user selected applications. It is implemented through the use of currently available shareware and public domain software at low cost.  The developed prototype follows accepted psychological choice, Management Information System (MIS) and/or Decision Support System (DDS) principles. It is easily modified by a user, said to be any general management team member, as the environment changes.  Team member roles, concerns, styles, and interests can be accommodated in the design or re-design.  The prototype and approach is friendly to occasional users.  One basic installation can serve several users.  It will work...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/14022

Maximum likelihood with estimating equations
Provedor de dados: 31
Autores: Grendar,   Marian; Judge,   George G.
Methods, like Maximum Empirical Likelihood (MEL), that operate within the Empirical Estimating Equations (E3) approach to estimation and inference are challenged by the Empty Set Problem (ESP). We propose to return from E3 back to the Estimating Equations, and to use the Maximum Likelihood method. In the discrete case the Maximum Likelihood with Estimating Equations (MLEE) method avoids ESP. In the continuous case, how to make ML-EE operational is an open question. Instead of it, we propose a Patched Empirical Likelihood, and demonstrate that it avoids ESP. The methods enjoy, in general, the same asymptotic properties as MEL.
Tipo: Working or Discussion Paper
Palavras-chave: Maximum likelihood; Estimating equations; Empirical likelihood; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/56691

Large Deviations Approach to Bayesian Nonparametric Consistency: the Case of Polya Urn Sampling
Provedor de dados: 31
Autores: Grendar,   Marian; Judge,   George G.; Niven,   R.K.
The Bayesian Sanov Theorem (BST) identifies, under both correct and incorrect specification of infinite dimensional model, the points of concentration of the posterior measure. Utilizing this insight in the context of Polya urn sampling, Bayesian nonparametric consistency is established. Polya BST is also used to provide an extension of Maximum Non-parametric Likelihood and Empirical Likelihood methods to the Polya case.
Tipo: Working or Discussion Paper
Palavras-chave: Polya L-divergence; Bayesian maximum (A posterior); Probability method; Maximum Non-Parametric Likelihood method; Empirical likelihood method; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/6056

Agritourism flows to Italy: an analysis of determinants using the gravity model approach
Provedor de dados: 31
Autores: Santeramo,   Fabio G.; Seccia,   Antonio; De Blasi,   Giuseppe; Carlucci,   Domenico.
Tourism represents one of the most important income sources for Italy. In recent years, apart from “traditional” destinations, tourism supply is widely changing in order to satisfy the customers “love for variety” and valorise marginal resources, then new formulas are emerging (e.g. agritourism). This work aims to elaborate and estimate an econometric model able to adequately explain the size of agritourists flows to Italy from main partner countries using the gravity model approach that has been broadly applied to the analysis of international flows. In this work, the “basic” model has been enlarged and improved with the introduction of other explicative variables. The results has allowed to confirm empirical validity of the gravity model in studying...
Tipo: Conference Paper or Presentation
Palavras-chave: Gravity Model; Agritourism; Rural tourism; Tourism flows; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6623

Creating print-ready tables in Stata
Provedor de dados: 31
Autores: Lokshin,   Michael; Sajaia,   Zurab.
This article describes the new Stata command xml_tab, which outputs the results of estimation commands and Stata matrices directly into tables in XML format. The XML files can be opened with Microsoft Excel or OpenOffice Calc, or they can be linked with Microsoft Word files. By using XML, xml_tab allows Stata users to apply a rich set of formatting options to the elements of output tables.
Tipo: Article
Palavras-chave: Xml_tab; Estimates; Regression; Matrices; Xml; Excel; Word; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122600

Data, Information and Knowledge in Agricultural Decision-Making
Provedor de dados: 31
Autores: Houskova Berankova,   Martina; Houska,   Milan.
It is very important to work with data, information and knowledge correctly, when a decision model is used as a support for managerial decision-making. Unfortunately, these terms are understood differently in various branches; particularly, the definitions of knowledge are very different. It causes problems in praxis; it is not clear, in which case data processing, information or knowledge/expert systems are appropriate to use. In this paper we introduce modern approaches to indentifying these terms. The objective of the paper is to identify data, information and knowledge in decision-making process, particularly in multiple-criteria decision-making model, to help users of such models to better understand it. To reach this objective, we need to provide...
Tipo: Journal Article
Palavras-chave: Data; Information; Knowledge; Multiple-Criteria Decision-Making Model; Grain Dryers; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/109740

Comprehensive evaluation on urban competitiveness - A Case of Xinjiang Province
Provedor de dados: 31
Autores: Wan,   Qiu-cheng.
This paper constructs the index system and econometric model of comprehensive evaluation on urban competitiveness, then adopts the factor analysis method to measure the urban competitiveness of 22 prefecture-level cities in Xinjiang Province. The 22 prefecture-level cities are divided into four levels according to the measurement result. Comprehensive analysis of the advantages and disadvantages of the cities in each level is carried out. And related countermeasures and proposals on how to improve the urban competitiveness of the 22 cities are put forward.
Tipo: Thesis or Dissertation
Palavras-chave: Urban competitiveness; Factor analysis; Xinjiang province; China; Community/Rural/Urban Development; Financial Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/53483

INDUCED INNOVATION TESTS ON WESTERN AMERICAN AGRICULTURE: A COINTEGRATION ANALYSIS
Provedor de dados: 31
Autores: Liu,   Qinghua; Shumway,   C. Richard.
The Induced Innovation Hypothesis (IIH) is tested for Western US agriculture by means of a cointegration test. An ECM model is used to separate the short-run and long-run effects of relative price changes. A difference in the elasticities of factor substitution along the isoquant curve and the innovation possibility curve implies IIH. The estimated results showed that the induced innovation hypothesis was supported for the three regions of Washington, PNW, and the West, but not for the nation.  However, while changes in relative input prices induced innovation, changes in output level or R&amp;E investments did not.  The empirical tests failed to find any significant impact of changes in the latter variables on agricultural technology in any of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22237

Estimating the Link Function in Multinomial Response Models under Endogeneity and Quadratic Loss
Provedor de dados: 31
Autores: Judge,   George G.; Mittelhammer,   Ronald C.
This paper considers estimation and inference for the multinomial response model in the case where endogenous variables are arguments of the unknown link function.   Semiparametric estimators are proposed that avoid the parametric assumptions underlying the likelihood approach as well as the loss of precision when using nonparametric estimation.  A data based shrinkage estimator that seeks an optimal combination of estimators and results in superior risk performance under quadratic loss is  also developed.
Tipo: Working or Discussion Paper
Palavras-chave: Multinomial Process; Endogeneity; Empirical likelihood procedures; Quadratic loss; Semiparametric estimation and inference; Data dependent shrinkage; Asymptotic and finite sample risk; Research Methods/ Statistical Methods; C10; C24.
Ano: 2004
URL: http://purl.umn.edu/25095

Stata tip 42: The overlay problem: Offset for clarity
Provedor de dados: 31
Autores: Cui,   James.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119263

THEORETICAL AND POLICY BACKGROUND TO THE TOP-MARD PROJECT (TOWARDS A POLICY MODEL OF MULTIFUNCTIONAL AGRICULTURE AND RURAL DEVELOPMENT)
Provedor de dados: 31
Autores: Bryden,   John Marshall; Arandia Miura,   Amaia; Johnson,   Thomas G.
The TOP-MARD project is a 3-year, 11 country, project supported by the EU’s Framework 6 Programme for Research and Technology Development1. The aim of the research project was to build a policy model of multifunctional agriculture and rural development which would link the multiple functions of agriculture with the development and quality of life of rural regions, and explore the influence of different policies on rural development outcomes. In order to deal with both market and non-market outputs, and to explore dynamics over time, a systems modelling approach was adopted.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6396

Murray Darling Basin Irrigation Adaptation to Drought: A Statistical Evaluation
Provedor de dados: 31
Autores: Connor,   Jeffery D.; Ahmad,   Mobin-ud-Din; King,   Darran; Banerjee,   Onil; Mainuddin,   Mohammed; Gao,   Lei.
Tipo: Presentation
Palavras-chave: Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/124266

UTILIZATION OF RELATIVE LAND ALLOCATION IN THE CALIBRATION OF AGRICULTURE SUPPLY MODELS BY THE PMP APPROACH
Provedor de dados: 31
Autores: Barkaoui,   Ahmed.
This poster proposes a new procedure in agriculture supply modelling by the positive mathematical programming (PMP) approach. This approach is now widely used in last CAP reform simulations. However, simulation behaviour and performances of PMP procedures depend of the way parameters of the non linear total cost function in the objective function are recovered. We propose a new specification of the total cost function where land is explicitly considered as a fixed input. By using relative parts of land of the different activities this new PMP procedure permits to better capture production behaviour when economic conditions. It also permits to avoid a drawback of the early procedures concerning marginal activities
Tipo: Conference Paper or Presentation
Palavras-chave: Positive Mathematical Programming; CAP; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q10; Q18.
Ano: 2008
URL: http://purl.umn.edu/44859

CLASSIFICATION OF RISK PREFERENCES WITH ELICITED UTILITY DATA:  DOES FUNCTIONAL FORM MATTER?
Provedor de dados: 31
Autores: Musser,   Wesley N.; Wetzstein,   Michael E.; Reece,   Susan Y.; Musser,   Lynn M.; Varca,   Philip E.; Chou,   Charlene C.J.
Recently, several problems with elicited utility functions have emerged.  This paper concerns a fundamental problem in risk preference classification with elicited data.  For the sample in this research, different functional forms resulted in reversals in preference classifications.  This paper suggests that preference classifications must be interpreted with caution.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/32133

Financing threatened species management: the costs of single species programmes and the budget constraint
Provedor de dados: 31
Autores: Moran,   Emma; Cullen,   Ross; Hughey,   Kenneth F.D.
In New Zealand total annual funding allows 15 percent of the 2,400 threatened species to be targeted for management. Although management costs are crucial to a conservation organisation's ability to achieve its goals, estimates of costs are not usually included in applications for funding or the preparation of recovery plans. Cost is also not generally a factor in priority ranking systems and cost-effectiveness analysis is rarely conducted. Using the results of analysis of 11 single species programmes for 2003-2012, this paper investigates the costs of management. It also considers the impact of the budget constraint on outcomes, cost-effectiveness, and investment.
Tipo: Conference Paper or Presentation
Palavras-chave: Threatened species; Management; Cost; Budget constraint; Agricultural and Food Policy; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98498

MAXIMUM SIMULATED LIKELIHOOD: A BRIEF INTRODUCTION FOR PRACTITIONERS
Provedor de dados: 31
Autores: Arias,   Carlos; Cox,   Thomas L.
This paper discusses the increasing importance of probability simulation methods in the context of Maximum Simulated Likelihood. Three probability simulators are analyzed following their chronological order of appearance. This analysis provides an intuitive approach to the basic idea behind probability simulation, the successive improvements and probable future developments. The paper pays special attention to the role of simulation noise in Maximum Simulated Likelihood.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/12662

Price Volatility, Nonlinearity, and Asymmetric Adjustments in Corn, Soybean, and Cattle Markets: Implications of Ethanol-Driven (Market) Shocks
Provedor de dados: 31
Autores: Tejeda,   Hernan A.; Goodwin,   Barry K.
Grain prices have risen sharply since 2005 and 2006 affecting livestock markets by increasing feed prices and leading to significant volatility shocks. The high price levels and magnitude of sustained high volatilities has raised concerns for many sectors of the economy, in particular those with direct relation to these markets. Policy makers are analyzing the interrelationships among these markets, and the effects of energy market shocks on agricultural markets. This study considers a threshold structure in a multivariate time-series model that evaluates these market linkages, capturing asymmetric correlations between grain and livestock prices, including volatility spillovers. We empirically study the impact of corn usage for ethanol production in the...
Tipo: Conference Paper or Presentation
Palavras-chave: Price volatility; Market linkages; Thresholds; Ethanol-driven shocks; Asymmetric correlations; Spillovers; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Demand and Price Analysis; Farm Management; Financial Economics; Public Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53039

Investigating the Effects of Attribute Level Framing and Changing Cost Levels in Choice Experiments
Provedor de dados: 31
Autores: Kragt,   Marit Ellen; Bennett,   Jeffrey W.
Choice experiments (CE) are increasingly used to estimate the values of non-market goods and services. A cost attribute is typically included in a CE questionnaire to estimate monetary values for changes in the non-market attributes presented. Although the cost attribute is centrally important, there has been limited research into the impacts of varying cost attribute levels on respondents’ choices in CE surveys. The context in which non-market attributes are presented to respondents (the ‘attribute frame’) may also affect value estimates. The challenge for CE practitioners is to identify the ‘appropriate’ attribute frames and cost level range.   Results from a CE study in Tasmania show that respondents’ preferences are not impacted by describing an...
Tipo: Report
Palavras-chave: Choice experiments; Mixed Logit models; Environmental valuation; Attribute framing; Cost bias; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94817

DIE LOGIK DES ENTSCHEIDENS IM EU-SYSTEM
Provedor de dados: 31
Autores: Henning,   Christian H.C.A.; Pappi,   Franz Urban.
Theoretical conception and empirical application to the European Union
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/24407

NON-PARAMETRIC APPROACHES TO ENVIRONMENTALLY SENSITIVE ANALYSIS OF ECONOMIC PERFORMANCE: TECHNICAL CHANGE AND PRODUCTIVITY GROWTH IN THE CANADIAN PULP AND PAPER INDUSTRY, 1959-1994
Provedor de dados: 31
Autores: Hailu,   Atakelty; Veeman,   Terrence S.
This study proposes non-parametric techniques for environmentally sensitive analysis of economic performance. The techniques are implemented using Canadian pulp and paper industry data covering the period from 1959 to 1994. The results indicate that productivity improvement has been more successful than conventional measures would suggest.
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Production Economics; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20813

Estimation of Stocking Rates by Multiple Regression Analysis
Provedor de dados: 31
Autores: Parish,   Ross M.; Dillon,   John L.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1956
URL: http://purl.umn.edu/8831

Nonparametric vs parametric binary choice models: An empirical investigation
Provedor de dados: 31
Autores: Bontemps,   Christophe; Racine,   Jeffrey S.; Simioni,   Michel.
The estimation of conditional probability distribution functions (PDFs) in a kernel nonparametric framework has recently received attention. As emphasized by Hall, Racine and Li (2004), these conditional PDFs are extremely useful for a range of tasks including modelling and predicting consumer choice. The aim of this paper is threefold. First, we implement nonparametric kernel estimation of PDF with a binary choice variable and both continuous and discrete explanatory variables. Second, we address the issue of the performances of this nonparametric estimator when compared to a classic on-the-shelf parametric estimator, namely a probit. We propose to evaluate these estimators in terms of their predictive performances, in the line of the recent "revealed...
Tipo: Conference Paper or Presentation
Palavras-chave: Binary choice models; Nonparametric estimation; Specification test; Tap water demand; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49286

Impacts of climate change on water resources and agriculture in Sri Lanka: a review and preliminary vulnerability mapping
Provedor de dados: 31
Autores: Eriyagama,   Nishadi; Smakhtin,   Vladimir U.; Chandrapala,   Lalith; Fernando,   Karin.
There is ample evidence to suggest that Sri Lanka’s climate has already changed. However, the bigger question of national importance is what Sri Lanka’s climate will look like in 50 or 100 years and how prepared the country is to face such changes. This report reviews the status of climate change (CC) research/activities in Sri Lanka in terms of observed and projected climatic changes, their impacts on water resources and agriculture, CC mitigation and adaptation, and research needs. The study also developed a pilot level CC Vulnerability Index, which was subsequently mapped at district level. The maps indicate that typical farming districts such as Nuwara Eliya, Badulla, Moneragala, Ratnapura and Anuradhapura are the most vulnerable to CC due to their...
Tipo: Report
Palavras-chave: Climate change; Rain; Water resource management; Crops; Mapping; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/94787

The role of intangible assets in value creation: case of Russian companies
Provedor de dados: 31
Autores: Garanina,   Tatiana.
The paper is devoted to the question of the role of intangible assets in value creation of companies in the economy of the XXI century. The main research objective is to define the impact of fundamental value of both tangible and intangible assets on the market value of companies. Evaluation of intangible assets is based on residual operating income (REOI) model. In the focus of the research there is a sample of Russian companies. The model was tested on the whole sample of the companies, and then separately on each of five industries: mechanical engineering, extractive industry, power engineering, communication services, and metallurgy.
Tipo: Journal Article
Palavras-chave: Intangible assets; Value-based management; Residual operating income; Management.; Industrial Organization; Research Methods/ Statistical Methods; M10.
Ano: 2009
URL: http://purl.umn.edu/94590

Competitiveness and revealed comparative advantage in the SADC maize industry
Provedor de dados: 31
Autores: Mutambatsere,   Emelly.
This paper evaluates the production and trade trends for maize and maize products in southern Africa, individual countries’ revealed comparative advantages in producing these products, and the expected implications of freer trade in this sector. The analysis employs mainly annual bilateral trade data for the period 1996-2004, evaluated using comprehensive descriptive measures and the Revealed Comparative Advantage index. Results indicate that at least half of the countries in the SADC region are deficit producers of maize and maize products, and that only South Africa is a net exporter of all products considered. Substantial cross-hauling is observed, and the bulk of locally produced products are traded regionally, with over 90% regional bias for half of...
Tipo: Conference Paper or Presentation
Palavras-chave: Community/Rural/Urban Development; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Industrial Organization; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/51996

ECONOMETRIC METHODOLOGY II : STRENGTHENING TIME SERIES ANALYSIS
Provedor de dados: 31
Autores: Townsend,   Rob F.
This article reviews some of the recent methodology developed for the analysis of time series data stressing that the statistical properties of the individual series need to be analysed to avoid spurious regressions. A convergence of econometric methodology is entertained with specific focus on cointegration and error correction models which allows the testing of long run relationships between variables and allows for a more dynamic structure than some of the previous models that appear in the literature. An example of this is the commonly used partial adjustment model in supply analysis which is nested in the less restrictive error correction model. Tests can be performed on the validity of these restrictions. These models have a wide application in...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/54908

SELECTION OF AGRICULTURAL LAND FOR MULTIFUNCTIONAL AGRICULTURE - QUANTITATIVE MODEL
Provedor de dados: 31
Autores: Novkovic,   Nebojsa; Somodji,   Sandor; Matkovic,   Milenko.
The modern concept of rural development implies the use of agricultural resources, primarily agricultural land, for other (non-agricultural) activities besides its agricultural purpose. The integral aim of this concept of rural development is the maximization of economic results, besides the sustainable development of rural areas, environmental protection and the production of strategic (staple) agricultural products. The objective of this paper is to define the general, theoretical, quantitative model for the determination of the size and quality of agricultural land which, considering the above-mentioned demands (criteria) is optimal for the utilization in agricultural production in certain regions. The remaining agricultural land would be available for...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural land; Optimization model; Use for non-agricultural purpose; Agribusiness; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/57504

INVESTIGATING RAPESEED PRICE VOLATILITIES IN THE COURSE OF THE FOOD CRISIS
Provedor de dados: 31
Autores: Busse,   Stefan; Brümmer,   Bernhard; Ihle,   Rico.
C2_3
Tipo: Conference Paper or Presentation
Palavras-chave: Multivariate GARCH; MATIF; Rapeseed; Crude oil; Volatilities; Food crisis; Demand and Price Analysis; Research Methods/ Statistical Methods; C32; E44; G1; Q11; Q13; Q49.
Ano: 2010
URL: http://purl.umn.edu/93957

Patterns of Pass-through of Commodity Price Shocks to Retail Prices
Provedor de dados: 31
Autores: Berck,   Peter; Leibtag,   Ephraim S.; Villas-Boas,   Sofia Berto; Solis,   Alex.
Commodity prices have been rising at unprecedented rates over the last two years.  The primary objective of this paper is to assess if and how firms pass through upstream cost increases to final good prices.  First, we investigate what happens to the shelf prices (the regular prices) of goods that contain significant amounts of a commodity whose price has changed.  The objective is to document patterns of price rigidity depending on the share of the commodity in the final good that is sold to consumers.  For example, given an abnormal commodity price change in wheat, what happens to the shelf regular price of bread, wheat cereals, and other goods that contain wheat?  Commodity pass-through patterns for ready to eat cereal (smallest share of commodity in...
Tipo: Working or Discussion Paper
Palavras-chave: Commodity prices; Retail prices; Statistical analysis; Consumer/Household Economics; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/51600

Adjustment Capacity of Korean Farm Household
Provedor de dados: 31
Autores: Kim,   Hanho; Kim,   Jae-Kyung.
Structural adjustment is defined as the farm household’s behavior of changing its existing farm asset distribution toward more specialized or diversified directions. Farm households are classified into agricultural or non-agricultural based ones. Estimated expected income through switching regression model reveals that higher revenue is expected when adjustment paths toward more specialization and more non-agricultural based activities are chosen.
Tipo: Conference Paper or Presentation
Palavras-chave: Trade policy reform; Structural adjustment; Expected income; Switching regression model; Farm household; Agricultural and Food Policy; Consumer/Household Economics; Research Methods/ Statistical Methods; Q100; Q180.
Ano: 2009
URL: http://purl.umn.edu/52839

Value label utilities: labeldup and labelrename
Provedor de dados: 31
Autores: Weesie,   Jeroen.
I describe two utilities dealing with value labels. labeldup reports and optionally removes duplicate value labels. labelrename renames a value label. Both utilities, of course, preserve the links between variables and value labels and support multilingual datasets.
Tipo: Journal Article
Palavras-chave: Labeldup; Labelrename; Value labels; Data integrity; Multilingual datasets; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117509

Die Expertenbewertung als Alternative zur Kontingenzbewertung
Provedor de dados: 31
Autores: Mann,   Stefan.
A lot of research is carried out on the Contingent Valuation Method to assess environmental goods. However, the method is rarely applied to quantify reimbursements for agri-environmental policy. In this paper, this contradiction is explained by conceptual shortcomings of the Contingent Valuation. It is suggested to discuss the utility of agri-environmental programs among experts. For that, a three-step methodology including a possible monetary evaluation is developed. The method is applied on agri-environmental programs in Switzerland.
Tipo: Journal Article
Palavras-chave: Contingent valuation; Experts; Agri-environmental policy; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/98084

Stata tip 36: Which observations? Erratum
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119251

An Outcome-Oriented Theory of Choice and Empirical Paradoxes in Expected Utility Theory
Provedor de dados: 31
Autores: Kaneko,   Fumihiro.
I analyze observed choice between lotteries from an outcome-oriented point of view in the framework of choice between random variables.  I characterize a choice maker, who faces a choice situation between lotteries, by (1) a surmising process that associates, with a pair of lotteries, a set of well-defined choice situations between random variables, and (2) a choice set that is a collection of well-defined choice situations.  I give a partial axiomatic foundation of the theory.  The theory is applied to explain the well-known paradoxes in expected utility theory.
Tipo: Working or Discussion Paper
Palavras-chave: Expected utility theory; SSA representation; SSB representation; Prospect theory; Choice under uncertainty; Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/28418

Decision Support System for Soybean Rust (Phakopsora pachyrhizi) Management using QnD
Provedor de dados: 31
Autores: Kiker,   Greg; Ranjan,   Ram.
The objective of this project is to design a decision support system for soybean rust management using gaming software that incorporates farmer’'s decision making in the face of risks from soybean rust.  Learning from past actions and neighbor’'s actions are also incorporated.  Farmers observe rust outbreak in the current and past periods and decide over how much of land to allocate between soybean, corn and other crops.  This decision is influenced by maximization of expected profits criterion which entails crop rotation choices that are based upon perceived risks, yield drags and input costs from altering optimum rotation patterns.  Adoption of new technology in terms of selecting better rust management practices is also analyzed in an adaptive...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21248

A Comparison of Methods for Imposing Curvature on the Normalized Quadratic Indirect Profit Function
Provedor de dados: 31
Autores: Featherstone,   Allen M.; Burbidge,   Linda D.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61661

POTENTIAL OF AGRICULTURAL DEVELOPMENT TO INCREASE RURAL EMPLOYMENT
Provedor de dados: 31
Autores: Pemberton,   Carlisle A.; Mgonja,   Mary A.
The paper examined whether increasing agricultural output would lead to an expansion of employment in rural areas in the Caribbean and Sub-Saharan Africa (SSA). The paper found that the agricultural development problems in the Caribbean and SSA are very similar, especially, declining export demand for products, adverse trade policies and the actions of nature, causing damage to  agricultural production.  The simulations performed showed that  in both regions, even a 4% annual increase in agricultural output has the potential for annually increasing agricultural employment by over 6%, even with an annual technical progress of 1.5% in the case of SSA and 2% in the case of the Caribbean.  Expanding rural employment through expansion of agricultural output is...
Tipo: Conference Paper or Presentation
Palavras-chave: Increasing rural employment; Rural Development; Agricultural Development in Caribbean and Sub-Saharan Africa; Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Financial Economics; Labor and Human Capital; Marketing; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/36972

Stata tip 60: Making fast and easy changes to files with filefilter
Provedor de dados: 31
Autores: Riley,   Alan R.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122592

INCORPORATING BIOFUELS INTO A PARTIAL EQUILIBRIUM MODEL OF THE EU AGRICULTURAL SECTOR
Provedor de dados: 31
Autores: Binfield,   Julian C.R.; Westhoff,   Patrick C.; Le Cadre,   Elodie.
The impact of increased consumption of biofuels on agricultural markets has already been substantial, and will increase further as countries around the world seek to expand the proportion of their energy that they get from renewable sources. Models of the agricultural sector must therefore include some consideration of the demand for agricultural products for biofuels and the byproducts that are produced as part of the production process that are returned to the agricultural sector. In this paper the method of introducing biofuels into the FAPRI GOLD (grains, oilseeds, livestock and dairy) model is discussed. A scenario is run whereby the EU is assumed to introduce a binding 10% target by 2020 and the results are discussed in order to illustrate the...
Tipo: Conference Paper or Presentation
Palavras-chave: Biofuels; Partial equilibrium model; Agricultural sector; EU policy; Agricultural and Food Policy; Crop Production/Industries; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6680

Can Subjective Measures for Rapid Assessment of Rural Poverty and Inequality be Useful in Botswana?
Provedor de dados: 31
Autores: Moepeng,   Pelotshweu T.; Tisdell,   Clement A.
Although middle income countries such as Botswana are credited with reliable data that are used in poverty measures, it is sometimes argued that the time lags between data generations or surveys are too wide. The Household Income and Expenditure Survey (HIES) in Botswana takes place every 10 years.  The major constraints are capacity and budget considerations. In this article, we propose two subjective measures that have been successfully used elsewhere for adaptation in Botswana. We use data from Nshakazhogwe village case study to test whether these alternative measures of poverty and deprivation are correlated with objective measures of economic deprivation. The Pearson Chi-square tests of independence are applied to examine the independence and the...
Tipo: Working Paper
Palavras-chave: Botswana; Rural Poverty; Chi square test; Heads of Household; Community/Rural/Urban Development; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/123547

A Pilot Study of the Quality of European Commission Extended Impact Assessment
Provedor de dados: 31
Autores: Lee,   Norman; Kirkpatrick,   Colin.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/30580

The Effects of the Micro-Market Structure for Kansas Grain Elevators on Spatial Grain Price Differentials
Provedor de dados: 31
Autores: O'Brien,   Daniel M.
Corn and wheat cash prices in Kansas are affected by a number of local supply-demand, market structure, transportation access and other factors. Kansas corn prices in 2008 were affected by form of business organization, local feedgrain production and livestock feed usage, elevator storage capacity, access to railroad grain handling facilities, and to a limited degree by the number of competitors in local markets. Geographic proximity to grain ethanol plants did not have a positive impact on local corn prices, although a number of mitigating factors may exist. Kansas wheat prices in 2008 were affected by local wheat production, elevator storage capacity, the number of competitors in local markets, and by location relative to flour mills. Evidence of...
Tipo: Conference Paper or Presentation
Palavras-chave: Grain markets; Market structure; Grain ethanol; Wheat flour; Monopsonistic competition; Agribusiness; Agricultural Finance; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53041

MULTIPLE COMPARISONS WITH THE BEST: BAYESIAN PRECISION MEASURES OF EFFICIENCY RANKINGS
Provedor de dados: 31
Autores: Dorfman,   Jeffrey H.; Atkinson,   Scott E.
A large literature exists on measuring the allocative and technical efficiency of a set of firms. A segment of this literature uses data envelopment analysis (DEA), creating relative efficiency rankings that are nonstochastic and thus cannot be evaluated according to the precision of the rankings. A parallel literature uses econometric techniques to estimate stochastic production frontiers or distance functions, providing at least the possibility of computing the precision of the resulting efficiency rankings. Recently, Horrace and Schmidt (2000) have applied sampling theoretic statistical techniques known as multiple comparisons with control (MCC) and multiple comparisons with the best (MCB) to the issue of measuring the precision of efficiency rankings....
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19800

Review of Statistics for Epidemiology by Jewell
Provedor de dados: 31
Autores: Bellocco,   Rino.
This article reviews Statistics for Epidemiology by Jewell.
Tipo: Journal Article
Palavras-chave: Epidemiology; Biostatistics; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117533

Determining Returns to Storage:  USDA Data versus Micro Level Data
Provedor de dados: 31
Autores: Klumpp,   Joni M.; Brorsen,   B. Wade; Anderson,   Kim B.
USDA data are commonly used to determine producers' returns to storage.  Aggregating data may result in a loss of information, leading to underestimated returns.  This study compares USDA and elevator data from Oklahoma to determine how much USDA data underestimates returns.  Results indicate USDA data only slightly underestimate returns to storage.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19523

Social benefit evaluation on regional land consolidation based on social security function of land - A Case of Nanjing City
Provedor de dados: 31
Autores: Yao,   Jun.
Quantitative method for social benefit evaluation on land consolidation is put forward based on social security function of land. It has broken through the limitation of current social benefit evaluation on land consolidation, which can only carry out qualitative assessment. Social security of land consolidation includes three aspects of the old-age security, medical security and unemployment security. Functional values of social security, such as the old-age security, medical security and unemployment security, for three types of population (basic population, dependent population and maintenance population) are calculated according to the effective area and original production of arable land. Research result shows that the implementation of land...
Tipo: Thesis or Dissertation
Palavras-chave: Land consolidation; Social benefit; Evaluation; China; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53485

Unit Roots, TV-STARs, and the Commodity Terms of Trade: A Further Assessment of the Prebisch-Singer Hypothesis
Provedor de dados: 31
Autores: Balagtas,   Joseph Valdes; Holt,   Matthew T.
Replaced with revised version of paper 06/27/06.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21405

ESTIMATING WILLINGNESS-TO-PAY USING A POLYCHOTOMOUS CHOICE FUNCTION: AN APPLICATION TO PORK PRODUCTS WITH ENVIRONMENTAL ATTRIBUTES
Provedor de dados: 31
Autores: Hurley,   Sean P.; Miller,   Douglas J.; Kliebenstein,   James B.
This paper utilizes a polychotomous choice function to investigate the relationship between socioeconomic characteristics and willingness-to-pay for embedded environmental attributes.  Specifically, a two-stage estimation procedure with an ordered probit selection rule is used to predict the premium payers and the magnitude of the premium they are willing to pay.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19924

LINEAR RESPONSE STOCHASTIC PLATEAU FUNCTIONS
Provedor de dados: 31
Autores: Tembo,   Gelson; Brorsen,   B. Wade; Epplin,   Francis M.
A method of estimating a linear response stochastic plateau function is developed and used to determine optimal levels of nitrogen fertilization for wheat.  Under the stochastic plateau model, optimizing behavior implies different nitrogen levels than the linear plateau model, depending on the output/input price ratio relative to a threshold level.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35217

The Effect of Market Structure on Pest Resistance Buildup
Provedor de dados: 31
Autores: Alix-Garcia,   Jennifer Marie; Zilberman,   David.
In this paper we present a continuous time optimal control analysis of resistance buildup in agricultural chemicals when the supplier is a monopolist. We compare the monopolistic, competitive and socially optimal solutions after establishing the stability of each equilibrium. The central finding is that with a monopolistic supplier, resistance buildup is lower than socially optimal. This directly opposes the standard result in the resistance literature. This implies that policies to manage resistance should vary with the age of the chemical, with no intervention during the lifetime of a patent and an optimal tax once the patent expires.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20273

Analysis of ranked ordered data when there are complete and partial ranking
Provedor de dados: 31
Autores: Pandit,   Mahesh; Paudel,   Krishna P.; Dunn,   Michael A.
Many methods are available to analyze rank ordered data. We used a spectral density analysis to identify most preferred options of Formosan Subterranean Termites (FST) control as ranked by Louisiana homeowners. Respondents are asked to rank four termite control methods form the most preferred option to the least preferred option. Spectral analysis of both complete and partial ranked data indicates that the most preferred termite control choice is a relatively cheap ($0.13 per square foot) option of a Liquid treatment.
Tipo: Conference Paper or Presentation
Palavras-chave: Complete and Partial ranked data; FST; Spectral analysis; Research Methods/ Statistical Methods; C65.
Ano: 2010
URL: http://purl.umn.edu/56430

Information and Communication Technologies for Regional Development in the Czech Republic – Broadband Connectivity in Rural Areas
Provedor de dados: 31
Autores: Vanek,   Jiri; Jarolimek,   Jan; Vogeltanzova,   Tereza.
The present paper introduces chosen results of an ICT development survey in the regions of the Czech Republic. The survey was primarily focused on broadband connectivity and its adoption by agricultural enterprises operating in rural areas. The survey was conducted in the context of both the EU strategy "Digital Agenda for Europe" and the national program document "National Policy in Electronic Communications - Digital Czech Republic". It stems from the enquiries that the situation is not – in spite of a certain improvement – satisfactory and the digital divide remains highly topical in rural areas of the Czech Republic. Broadband connectivity reaches practically 100% in urban areas and more than 85% in suburban areas whereas the rural areas show only...
Tipo: Journal Article
Palavras-chave: ICT adoption; Broadband; Digital Agenda for Europe; ADSL; FTTx; Wi-Fi.; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/116385

Does Futures Price Volatility Differ Across Delivery Horizon?
Provedor de dados: 31
Autores: Karali,   Berna; Dorfman,   Jeffrey H.; Thurman,   Walter N.
We study the difference in the volatility dynamics of CBOT corn, soybeans, and oats futures prices across different delivery horizons via the smoothed Bayesian estimator of Karali, Dorfman, and Thurman (2010). We show that the futures price volatilities in these markets are affected by the inventories, time to delivery, and the crop progress period. Some of these effects vary across delivery horizons. Further, it is shown that the price volatility is higher before the harvest starts in most of the cases compared to the volatility during the planting period. These results have implications for hedging, options pricing, and the setting of margin requirements.
Tipo: Conference Paper or Presentation
Palavras-chave: Bayesian econometrics; Futures markets; Seasonality; Theory of storage; Volatility; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Consumer/Household Economics; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53036

Optimal response to periodic shortage: engineering/economic analysis for a large urban water district
Provedor de dados: 31
Autores: Fisher,   Anthony C.; Fullerton,   David; Hatch,   Nile W.; Reinelt,   Peter.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1992
URL: http://purl.umn.edu/6097

A Comparison of RAS and Entropy Methods in Updating IO Tables
Provedor de dados: 31
Autores: Ahmed,   Syud Amer; Preckel,   Paul V.
Since the first half of the 20th century, the input-output (IO) table has been the backbone of much empirical work used to support policy analysis and develop economy-wide models. The need for accurate, up-to-date IO tables is thus essential for establishing the validity of the empirical work that follows from them. However, the construction of an IO table for any given country is an expensive and time-consuming endeavor. Current and accurate IO tables for many countries are thus often difficult to obtain on a regular basis. Once an initial IO table has been constructed, a common workaround is to collect partial information for subsequent periods, such as final demands for commodities within the economy, and then employ a Bayesian parameter estimation...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/9847

PRICE-LINKED FARM AND SPATIAL EQUILIBRIUM MODELS
Provedor de dados: 31
Autores: Batterham,   Robert L.; MacAulay,   T. Gordon.
The integration of detailed farm supply models with the basic spatial equilibrium model, is outlined. The direct linking of farm linear programming models with the spatial equilibrium model is achieved so that both prices and quantities are endogenous. Both the farm model and the spatial equilibrium model must be specified in primal-dual form to make the linkages. Limited details of the use of such a model in a study of a segment of the grain handling system in New South Wales are presented along with conclusions relating to the pricing of grain handling services.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/22953

Improving Agronomic Structure in Econometric Models of Climate Change Impacts
Provedor de dados: 31
Autores: Ortiz-Bobea,   Ariel.
Economists are relying on agronomic concepts to construct weather or climate independent variables and improve the reliability and efficiency of econometric models of climate change impact on U.S. agriculture. The use of cumulative heat measures in agronomy (growing degree-days), has recently served as a basis for the introduction of plurimonthly calendar heat variables in these models. However, season-long weather conditions seem at odds with conventional agronomic wisdom that emphasizes crucial differences in crop stage sensitivity to environmental stress. In this paper I show that weather variables matched to key corn development stages provide an enhanced and more stable fit than their calendar counterparts. More importantly, the proposed...
Tipo: Conference Paper or Presentation
Palavras-chave: Agriculture; Climate change; Corn; Degree-days; Phenology; Proxy; Yield; Production Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Q54; C23.
Ano: 2011
URL: http://purl.umn.edu/103656

Agricultural Inter-Sectoral Linkages and Its Contribution to Economic Growth in the Transition Countries
Provedor de dados: 31
Autores: Subramaniam,   Vijay; Reed,   Michael R.
This study estimates an econometric model that incorporates the linkages among agriculture, manufacturing, service and trade sectors using a vector error correction model for Poland and Romania. Three cointegrating vectors for Poland and one for Romania confirm that the different sectors in the Poland and Romania moved together over the sample period, and for this reason, their growth rates are interdependent. The long-run relationship of industrial, service and trade sectors to agricultural sector were established, and the results show that the industrial sector in Poland contributes positively to the agricultural sector while the growing service sector shows mixed results. The results of Romania indicate that the industrial sector is detrimental to...
Tipo: Conference Paper or Presentation
Palavras-chave: Transition economy; Inter-sectoral growth linkages; Cointegration analysis; International Development; Research Methods/ Statistical Methods; P20; 041; C32.
Ano: 2009
URL: http://purl.umn.edu/51586

Product Information and Willingness-to-Pay: A Case Study of Fair Trade Coffee on Chinese Market
Provedor de dados: 31
Autores: Yang,   Shang-Ho; Guan,   Huanda; Hu,   Wuyang; Liu,   Yun.
Poster Presentation
Tipo: Presentation
Palavras-chave: Product information; Willingness-to-pay; Fair trade coffee; Chinese market; Agribusiness; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods; D12; Q13.
Ano: 2012
URL: http://purl.umn.edu/124360

Effects of Endogenous Task Complexity and the Endowed Bundle on Stated Choice
Provedor de dados: 31
Autores: Hu,   Wuyang.
Conventionally, studies examining the impacts of choice complexity only consider complexity introduced exogenously from the tasks respondents face.  In the context of a stated conjoint survey, this article establishes endogenous complexity measures through decision-makers’' experience known as the endowed bundle before the survey.  Results show that complexity should not only be defined exogenously.  Endogenous complexity measures are important in determining the utility associated with an alternative and the decision of whether to participate in the market.  In addition, some of these complexity effects are nonlinear.  We also show that exogenous complexity simultaneous affects the choice consistency.
Tipo: Conference Paper or Presentation
Palavras-chave: Complexity; Endowed Bundle; Random Utility; Stated Choice; Research Methods/ Statistical Methods; C81; D12.
Ano: 2006
URL: http://purl.umn.edu/21437

DEA based yardstick competition in natural resource management
Provedor de dados: 31
Autores: Bogetoft,   Peter; Nielsen,   Kurt.
In this paper, we discuss the pros and cons of using Data Envelopment Analysis (DEA) to evaluate and enhance the efficiency of natural resource management. The need for a multidimensional production frontier approach is sketched, along with examples from other regulated multi-output industries, Also, reviews of the basic properties of DEA and DEA based yardstick competition are provided. Finally, we discuss the use of DEA based yardstick to evaluate bids in multi-dimensional procurement auctions.
Tipo: Conference Paper or Presentation
Palavras-chave: Regulation; Incentives; Performance evaluation; Yardstick competition; Data envelopment analysis (DEA); Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2003
URL: http://purl.umn.edu/57928

Un sistema de indicadores líderes del nivel de actividad para la economía peruana
Provedor de dados: 31
Autores: Escobal D'Angelo,   Javier; Torres,   Javier.
El propósito de este trabajo es presentar una metodología para construir un Indicador Líder Compuesto del Producto Bruto Interno (PBI). El indicador agrega un conjunto de variables asociadas a la evolución futura del PBI, las que han sido previamente filtradas para evitar que incorporen relaciones espurias con la variable objetivo. Las ponderaciones han sido escogidas, luego de analizar varias opciones, asegurando que minimicen el error cuadrático medio de la predicción. Luego de analizar las propiedades estadísticas de cerca de 200 indicadores económicos, se identificó a 14 variables como aquellas que en conjunto pueden permitir una buena predicción del PBI con una anticipación de hasta 6 meses. Entre estas variables destacan el crédito del sistema...
Tipo: Working or Discussion Paper
Palavras-chave: Producto bruto interno; Indicadores económicos; Perú; Gross domestic product; Economic  indicators; Peru; Research Methods/ Statistical Methods; C4.
Ano: 2002
URL: http://purl.umn.edu/37754

Review of A Visual Guide to Stata Graphics, Second Edition by Michael N. Mitchell
Provedor de dados: 31
Autores: Merryman,   Scott.
This article reviews A Visual Guide to Stata Graphics, Second Edition by Michael N. Mitchell.
Tipo: Article
Palavras-chave: Graphics; Stata texts; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122604

Opportunity and Choice in Social Networks
Provedor de dados: 31
Autores: Pin,   Paolo; Franz,   Silvio; Marsili,   Matteo.
Our societies are heterogeneous in many dimensions such as census, education, religion, ethnic and cultural composition. The links between individuals - e.g. by friendship, marriage or collaboration - are not evenly distributed, but rather tend to be concentrated within the same group.  This phenomenon, called imbreeding homophily, has been related to either (social) preference for links with own--type individuals ( choice-based homophily) or to the prevalence of individuals of her same type in the choice set of an individual ( opportunity-based homophily). We propose an indicator to distinguish between these effects for minority groups. This is based on the observation that, in environments with unbiased opportunities, as the relative size of the minority...
Tipo: Working or Discussion Paper
Palavras-chave: Social Networks; Choice-Based and Opportunity-Based Homophily; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; D85; J11; J12.
Ano: 2008
URL: http://purl.umn.edu/6232

Farm Productivity and Household Market Participation: Evidence from LSMS Data
Provedor de dados: 31
Autores: Rios,   Ana R.; Shively,   Gerald E.; Masters,   William A.
We analyze the correlation between farm productivity and market participation using comparable household data from Tanzania, Vietnam and Guatemala. Each farm’s input use and output levels provide a within-sample measure of relative productivity, which we relate to that household’s level of participation in local markets using a wide range of agricultural, demographic and infrastructural variables as controls and as instruments in two-stage regressions.  Results indicate that, controlling for differences in market access and the underlying determinants of market participation, households with higher productivity have greater participation in agricultural markets. In contrast, households with greater rates of market participation do not consistently...
Tipo: Conference Paper or Presentation
Palavras-chave: Market participation; Productivity; Multi-country sample; Household surveys; Consumer/Household Economics; International Development; Productivity Analysis; Research Methods/ Statistical Methods; O13; Q12; Q13.
Ano: 2009
URL: http://purl.umn.edu/51031

Modelling Policies for Multifunctional Agriculture and Rural Development – a Norwegian Approach
Provedor de dados: 31
Autores: Refsgaard,   Karen; Prestegard,   Sjur Spildo.
This paper outlines the development and use of a policy model for multifunctional agriculture and rural development. The model is an important part of the EU research project, TOP-MARD (Towards a Policy Model for Multifunctional Agriculture and Rural Development).. It sets the discourse on multifunctional agriculture in the context of what OECD calls the ‘New Rural Paradigm’, and explores the ways in which both market and non-market ‘functions’ of agriculture and farm households link with economic development and quality of life in different rural territories, and how different kinds of policies influence these linkages. We develop a policy model based on an approach closer to ecological economics, adopting a systems analytic approach.We seek to capture...
Tipo: Conference Paper or Presentation
Palavras-chave: Multifunctionality; Agriculture; Rural development; Dynamic simulation modeling; Territorial approach; Policy scenario; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6487

Stata tip 2: Building with floors and ceilings
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116202

Partial equilibrium model of Czech beef trade
Provedor de dados: 31
Autores: Maly,   Michal; Mala,   Zdenka; Sobrova,   L.; Halova,   P.
The paper is focused on the modeling of a partial equilibrium on the beef market in the Czech Republic. The goal of the paper is a construction and a quantification of a partial equilibrium model of mentioned trade, used for simulation purpose and enabling delimitation of main determinants of beef supply and demand. Data was gained from standard statistical reports of the Ministry of Agriculture and from Statistics of Households Accounts from the year 1995 – 2009. Proposed model respects three levels of beef chain – farmer, processer and consumer. Simultaneously, it respects trade flows on an open market. From the functional point of view, it respects nonlinearity of suppose relationships. The model was quantified by OLS with respects of recursive...
Tipo: Journal Article
Palavras-chave: Beef; Partial Equilibrium Model; Czech Republic; Time Series; Panel Data; Agribusiness; Agricultural and Food Policy; Production Economics; Research Methods/ Statistical Methods; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/109736

SENSITIVITY OF THE GME ESTIMATES TO SUPPORT BOUNDS
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
The claim has been made that the Generalized Maximum Entropy (GME) estimator of Golan, Judge and Miller is not sensitive to variations in the support bounds of either the parameters or the error terms. In this paper, we scrutinized this claim by means of Monte Carlo experiments and found that the parameter estimates are impacted in a substantial way by these changes. We also analyzed the famous data sample on the US manufacturing industry used by Cobb and Douglas in 1934 and found that the GME estimator is very sensitive to changes in support bounds. We conclude with a general result by Caputo and Paris according to which any support bound variation produces unexpected responses in the parameter estimates.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/11966

Entwicklung eines Modells zur Projektion des Wirtschaftswachstums und der langfristigen Nachfrage nach Produktionsfaktoren in Deutschland: unter besonderer Berucksichtigung des informations- technologischen Innovationsprozesses
Provedor de dados: 31
Autores: Danckwerts,   Rudolf-Ferdinand; Grossmann,   Wolf Dieter; Henne,   Wolfgang.
Es wird das Konzept für ein makroökonomisches Strukturmodell mit integriertem Innovationsprozesskern zur Analyse und Projektion der Wirtschaftsentwicklung in Deutschland vorgestellt. Das geplante Modell soll explizit die Auswirkungen des immer bedeutsamer werdenden IuK-technologischen Innovationsprozesses auf das Wirtschaftswachstum erfassen. Das Modell besteht aus einem makroökonometrischen Teil zur Darstellung der gesamtwirtschaftlichen Entwicklung und einem systemdynamischen Teil zur Erfassung des Innovationsprozesses auf mikroökonomischer Ebene. Als Modellteile sind zwei bereits existierende Modelle, das HWWA-Modell und das ISIS-Modell, nach ihrer Erweiterung und Anpassung vorgesehen. Die erforderlichen Modifizierungen, das Verfahren zur Kopplung der...
Tipo: Working or Discussion Paper
Palavras-chave: Zeitreihenmodelle; Dynamische Analyse; Prognose und Simulation; Neue Ökonomie; Technischer Wandel; Research Methods/ Statistical Methods; C32; C53; C61; E17; O33.
Ano: 2003
URL: http://purl.umn.edu/26166

Stata tip 48: Discrete uses for uniform()
Provedor de dados: 31
Autores: Buis,   Maarten L.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119286

Depending on conditions: a tutorial on the cond() function
Provedor de dados: 31
Autores: Kantor,   David; Cox,   Nicholas J.
This is a tutorial on the cond() function, giving explanations and examples and assessing its advantages and limitations.
Tipo: Journal Article
Palavras-chave: Cond(); Functions; If command; If qualifier; Generate; Replace; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117530

Application of decision support methods in preparation for a Hungarian bio-fuel programme
Provedor de dados: 31
Autores: Lakner,   Zoltan; Vizvari,   Bela.
Under current market circumstances and those predictable in the near future, further increasing agricultural production seems to be rather groundless. By utilising agro-ecological conditions more efficiently, one eighth of Hungary’s gasoline demand could be satisfied from maize production, without considerably decreasing current agricultural production for human and animal consumption. For realisation of biofuel programmes a relatively stable socio-economic environment is essential. There is considerable pressure on government from different stakeholders to shift the risks of large-scale investments to the state budget. In the long-run, under the conditions of a liberalised world market the feasibility of biofuel-programmes based on European raw materials,...
Tipo: Journal Article
Palavras-chave: Agro-ecological potential; Land usage; Linear programming; Deterministic modelling; Multi-issue actor analysis; Agricultural and Food Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/48087

Measurement of Farm Credit Risk: SUR Model and Simulation Approach
Provedor de dados: 31
Autores: Yan,   Yan; Barry,   Peter J.; Paulson,   Nicholas D.; Schnitkey,   Gary D.
The study addresses problems in measuring credit risk under the structure model, and then proposes a seemingly unrelated regression model (SUR) to predict farms’ ability in meeting their current and anticipated obligations in the next 12 months. The empirical model accounts for both the dependence structure and the dynamic feature of the structure model, and is used for estimating asset correlation using FBFM data for 1995-2004. Farm credit risk is then predicted by copula based simulation process with historical default rates as benchmark. Results are reported and compared to previous studies on farm default.
Tipo: Conference Paper or Presentation
Palavras-chave: Credit Risk Measurement; Seemingly Unrelated Regression Model; Simulation; Agribusiness; Agricultural Finance; Farm Management; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/49222

MULTICOLLINEARITY IN REGRESSION WITH QUADRATIC REGRESSORS
Provedor de dados: 31
Autores: Griffiths,   William E.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1971
URL: http://purl.umn.edu/13441

Stata tip 71: The problem of split identity, or how to group dyads
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122628

Stata tip 74: firstonly, a new option for tab2
Provedor de dados: 31
Autores: Gutierrez,   Roberto G.; Lachenbruch,   Peter A.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122712

A New Measure of the Producer Welfare Effects of Technological Change
Provedor de dados: 31
Autores: Bullock,   David S.
It is well recognized that the statistical reliability of the conventional method of estimating the effects of technological change on producer welfare is often quite poor.  I present a method that enhances the statistical reliability of such estimates.  I emphasize that when measuring the welfare effects of technological change, valuable information can be gleaned from data on input prices and quantities.  This type of data is often available, but the conventional measure typically does not take full advantage of its availability.  Letting T0 be some initial level of technology and T1 be a subsequent level, the conventional measure of producer welfare change due to a technology change is the change in the “triangle” area under the price and behind the...
Tipo: Conference Paper or Presentation
Palavras-chave: Technological change; Producer welfare; Applied welfare economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; O30; O33.
Ano: 2011
URL: http://purl.umn.edu/103834

MODELLING THE IMPACTS OF MACROECONOMIC AND TRADE POLICIES ON THE SOUTH AFRICAN AGRICULTURAL SECTOR
Provedor de dados: 31
Autores: Letsoalo,   Anthony; Kirsten,   Johann F.
The purpose of this paper is to investigate the importance of macroeconomic and trade policies on the agricultural sector in South Africa. Macroeconomic and trade policies are determined outside the agricultural sector and since the 1990s South Africa has been moving towards deregulation and trade liberalization. Structural econometric model was applied to determine the impacts of changes in macroeconomic and trade policies on the agricultural sector. Two Stage Least Squares (TSLS) was the technique used because of the simultaneous nature of the equations in the model. The results of the study shows that 10 percent reduction in import tariffs will lead to 11.44 percent increase in the degree of openness of the South African economy. Furthermore, the...
Tipo: Conference Paper or Presentation
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/19085

AN INTEGRATED TERRITORIAL SIMULATION MODEL TO EVALUATE CAP REFORM ON MEDITERRANEAN AGRICULTURE. METHODOLOGICAL PROPOSAL AND FIRST APPLICATIONS IN APULIA REGION (SOUTHERN ITALY)
Provedor de dados: 31
Autores: Scardigno,   Alessandra; Bazzani,   Guido Maria.
The implementation of most recent CAP and water policy reforms calls for simulation analytical tools able to quantify socio-economic and environmental impacts that can be different in terms of regions and farm type. This work proposes a territorial mathematical programming model that integrates hundreds of farm models clustered in a single meta-model at regional level that can be easily standardized having the FADN as the main data source. The tool has been experimentally applied to Apulia region and several simulations have been conducted in scenarios differing in terms of agricultural policies (total decoupling, increase of the modulation rate and introduction of a flat rate system for the Single Farm Payment), price of the water resource, market...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural policies; Water policy reforms; Territorial mathematical programming model.; Agricultural and Food Policy; Political Economy; Research Methods/ Statistical Methods; Q18; Q25; Q51.
Ano: 2008
URL: http://purl.umn.edu/44799

Tools for analyzing multiple imputed datasets
Provedor de dados: 31
Autores: Carlin,   John B.; Li,   Ning; Greenwood,   Philip; Coffey,   Carolyn.
The method of multiple imputation (MI) is used increasingly for analyzing datasets with missing observations. Two sets of tasks are required in order to implement the method: (a) generating multiple complete datasets in which missing values have been imputed by simulating from an appropriate probability distribution and (b) analyzing the multiple imputed datasets and combining complete data inferences from them to form an overall inference for parameters of interest. An increasing number of software tools are available for task (a), although this is difficult to automate, because the method of imputation should depend on the context and available covariate data. When the quantity of missing data is not great, the sensitivity of results to the imputation...
Tipo: Journal Article
Palavras-chave: Missing data; Multiple imputation; Rubin's rule of combination; Overall estimates; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116087

Improving the Use of Experimental Auctions in Africa: Theory and Evidence
Provedor de dados: 31
Autores: Morawetz,   Ulrich B.; De Groote,   Hugo; Kimenju,   Simon Chege.
Experimental auctions have not been widely used in Africa. However, auctions are important tools for evaluating new products and technologies. To increase the quality of these experiments, we explore an alternative first-price bidding mechanism that is more similar to African market exchanges and we analyze factors likely to affect bidding. Experiments with African consumers show that the proposed first-price mechanism has no advantage over conventional second-price mechanisms. Results show high and significant cash-in-hand, experimenter, and time of day effects in main rounds, and significant ordering effects in test rounds. These effects need to be carefully considered when applying the Becker-DeGroot-Marschak mechanism in Africa.
Tipo: Journal Article
Palavras-chave: Africa; BDM mechanism; Experimenter effect; First-price auction; Income effect; Order effect; Time of day effect; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/117161

Effects of agri-environmental measures and changes in EU single farm payments on Dutch agriculture
Provedor de dados: 31
Autores: Helming,   John F.M.; Schrijver,   R.A.M.
Part of the Health check of the Common Agricultural Policy (CAP) of the European Union in 2008, will be a discussion of the linkage between direct payments to farmers and the contribution of agricultural production to social important values. The objective of this paper is to analyse the economic and environmental effects of extra region specific environmental measures and a redistribution of direct payments to the Dutch agricultural sector in 2020. In doing so a chain of models is used from the dairy farm level to the regional sector level in the Netherlands to the European sector level. From the dairy farm model it is found that the extra-environmental measures result in a decrease in the number of dairy cows per ha and a decrease in the gross margin per...
Tipo: Conference Paper or Presentation
Palavras-chave: Economic models; Model linking; Policy; Regions; Dairy farming; Environment and nature; Agricultural and Food Policy; Agricultural Finance; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6602

PARTICIPATORY RESEARCH METHODS FOR TECHNOLOGY EVALUATION: A MANUAL FOR SCIENTISTS WORKING WITH FARMERS
Provedor de dados: 31
Autores: Bellon,   Mauricio R.
This manual presents methods that enable agricultural scientist and farmers to evaluate technologies/practices jointly. The methods are specifically designed for participatory research on germplasm and soil fertility technologies, and they are illustrated with actual examples from three research projects. The manual begins by reviewing conceptual issues that are important in participatory research and presents information to assist researchers in selecting research sites and fieldwork participants. Next, the manual describes the rationale and associated methods for each major activity in farmer participatory research: diagnosing farmers' conditions, evaluating current and new technologies/practices, and assessing their impact. Goals, procedures,...
Tipo: Book Chapter
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/23717

Bounded Recursive Stochastic Simulation - A Simple and Efficient Method for Pricing Complex American Type Options
Provedor de dados: 31
Autores: Musshoff,   Oliver; Hirschauer,   Norbert; Palmer,   Ken.
This paper gives an overview of simulation based procedures, which have proved to be efficient in valuing American options and therefore real options. Many of them integrate sequential stochastic simulations in the backward recursive programming approach to determine the early-exercise frontier. They subsequently value the option by initiating a Monte-Carlo simulation from the valuation date of the option. It turns out that one approach (Grant et al., 1997) is especially simple. We are able to enhance its efficiency by stripping it of some time consuming but unnecessary simulation steps. Our simplified approach could be called "Bounded Recursive Stochastic Simulation".
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/18823

On the creation and destruction of public goods : the matter of sequencing
Provedor de dados: 31
Autores: Carson,   Richard T.; Flores,   Nicholas; Hanemann,   W. Michael.
We consider sequences where a subset of public goods are systematically being created or destroyed. For the case of strict Hicksian substitutes between all pairs of this subset of public goods, we show that willingness to pay for an increase in a particular public good is strictly decreasing the farther out in a sequence it is valued. For the destruction of public goods the reverse is true for willingness to accept compensation. Thus, sequencing has opposite implications for the assessment of the benefits of providing public goods and for the assessment of the damages from destroying them.
Tipo: Working or Discussion Paper
Palavras-chave: Public Economics; Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/6103

Cairo Evaluation Clinic: Thoughts on Randomized Trials for Evaluation of Development
Provedor de dados: 31
Autores: Karlan,   Dean S.
We were asked to discuss specific methodological approaches to evaluating three hypothetical interventions. This article uses this forum to discuss three misperceptions about randomized trials.  First, nobody argues that randomized trials are appropriate in all settings, and for all questions.  Everyone agrees that asking the right question is the highest priority.  Second, the decision about what to measure and how to measure it, i.e., through qualitative or participatory methods versus quantitative survey or administrative data methods, is independent of the decision about whether to conduct a randomized trial.  Third, randomized trials can be used to evaluate complex and dynamic processes, not just simple and static interventions.  Evaluators should aim...
Tipo: Working or Discussion Paper
Palavras-chave: Program evaluation; Randomized control trial; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; Labor and Human Capital; Public Economics; Research Methods/ Statistical Methods; B41; O12; H43; J08; H54; D73; D12.
Ano: 2009
URL: http://purl.umn.edu/51913

STATISTICAL FARM REGISTER IN THE EU ACCEDING COUNTRIES - A CONCEPTUAL APPROACH
Provedor de dados: 31
Autores: Turtoi,   Crina; Akyildirim,   Oguzhan; Petkov,   Plamen.
Professional paper
Tipo: Article
Palavras-chave: Statistical farm register; Agricultural husbandries; Labor and Human Capital; Research Methods/ Statistical Methods; C10; C44; Q10.
Ano: 2012
URL: http://purl.umn.edu/123966

APPLICATION OF SAMPLING SURVEY IN ESTIMATING AGRICULTURAL STATISTICS OF THAILAND
Provedor de dados: 31
Autores: Buasri,   Prajiad.
Thailand is an essentially agricultural country.  Agriculture provides direct employment to 81 percent of the nation's population.  Approximately one third of the Gross Domestic Product originates in the agricultural sector, including agricultural crops, livestock, fisheries, and forestry.  Substantially more income is earned in the marketing and processing of agricultural commodities.  The major exports of Thailand continue to be primary agricultural products such as rice, rubber, teak, corn, kenaf, cassava, oil seeds, and other upland crops.  These account for 90 percent of total foreign exchange earnings.  Since Thailand has a prosperous agrarian economy, and agriculture continues to be the main economic activity despite the growing importance of other...
Tipo: Thesis or Dissertation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1971
URL: http://purl.umn.edu/10976

Climate Change and Greenhouse Gas Awareness Study
Provedor de dados: 31
Autores: Aubin,   Pierre; Auger,   Genevieve; Perreault,   Claude.
This study falls within the enhancing awareness and understanding theme of the National Climate Change Strategy. It was conducted by Agriculture and Agri-Food Canada in January/February 2001 and involved   1,643 farming operation, feeder cattle, dairy cattle, hogs and poultry producers.  The purpose of this study is to assess producers' level of awareness of climate change and greenhouse gas (GHG) emissions as well as their understanding of the role of agriculture in the emissions of GHG. This   study also establishes a baseline measurement that will be used to evaluate the success of the awareness and public education effort regarding climate change and GHG.
Tipo: Report
Palavras-chave: Climate change; Greenhouse gas emissions; Emission targets; Kyoto protocol; National climate change process; Survey; Farm Management; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/53932

Inventory and Methodology for Assessing the Impacts of Environmental Regulations in the Agricultural Sector
Provedor de dados: 31
Autores: Nolet,   Jean; Sauve,   Claude; Geoffroy,   Amelie; Sanchez,   Richard.
There is a growing concern about the impact and effectiveness of environmental regulations, specifically impact on the competitiveness of primary agriculture.  The objective of this report is to discuss different methodologies and assessment criteria for the evaluation of the impacts of environmental regulations in the agricultural sector; to identify the relevant environmental regulations administered at the federal, provincial and local levels; and an analytical framework to evaluate the future role of regulations and other policy instruments in achieving the desired social, environmental and economic outcomes. This study is a foundation piece for later phases of multi-year research project to develop strategic environmental policy for sustainable...
Tipo: Report
Palavras-chave: Environmental issues; Competitiveness of primary agriculture; SMART Regulation; Agri-environmental regulations; Environmental regulatory constraints; Agricultural and Food Policy; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/53770

Compiling National, Multiregional and Regional Social Accounting Matrices for South Africa
Provedor de dados: 31
Autores: van Schoor,   Melt; Punt,   Cecilia; McDonald,   Scott.
This report provides a technical description of the development of a set of Social Accounting Matrices (SAMs) for South Africa for the base year 2000. The set of SAMs consists of a national SAM, four regional SAMs and a multiregional SAM. The point of departure is a National Accounting Matrix (NAM) for South Africa. The report discusses the structure of each type of SAM, the main data sources that were used and the way in which different sets of data were organised for inclusion in the SAM. Entropy techniques were used to estimate missing information in order to derive complete and consistent SAMs. The theory and practical implementation of the entropy techniques are discussed in this report. The large number of accounts included in the SAMs warranted that...
Tipo: Working or Discussion Paper
Palavras-chave: General Equilibrium and Disequilibrium; Research Methods/ Statistical Methods; D5.
Ano: 2006
URL: http://purl.umn.edu/58067

Insights from the Guatemalan food system: an application of exploratory spatial data analysis techniques for food security analysis
Provedor de dados: 31
Autores: Alcaraz V.,   Gabriela; Zeller,   Manfred.
The achievement of food security for all remains one of the main development objectives worldwide. Most commonly, non-spatial models are developed for either explaining the underlying determinants of food insecurity and undernourishment or for predicting their changes, so as for identifying vulnerable groups for targeting support. Such approach ignores geographic determinants and the spatial dependency of food security and nutrition outcomes. This paper seeks to address this issue. We use nationally representative data from Guatemala, which faces high and rising rates of undernourishment and child stunting in spite of the efforts engaged on their reduction. Through exploratory spatial data analysis and overlay techniques, some elements embedded in the food...
Tipo: Conference Paper or Presentation
Palavras-chave: Food-system; Spatial; Guatemala; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/51488

A State Dependent Regime Switching Model of Dynamic Correlations
Provedor de dados: 31
Autores: Tejeda,   Hernan A.; Goodwin,   Barry K.; Pelletier,   Denis.
Replaced with revised version of paper 07/29/09.
Tipo: Conference Paper or Presentation
Palavras-chave: Dynamic correlations; Regime switching; State dependent probabilities; Thresholds; Spillovers; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49370

FARM-LEVEL DATA MODEL FOR AGRICULTURAL POLICY ANALYSIS: A TWO-WAY ECM APPROACH
Provedor de dados: 31
Autores: Sckokai,   Paolo; Moro,   Daniele; Platoni,   Silvia.
Econometric models wishing to estimate relevant parameters for agricultural policy analysis are increasingly relying on unbalanced panels of farm-level data. Since in the agricultural economics literature such models have often been estimated through simplified approaches, in this paper we try to verify whether the adoption of more sophisticated panel data techniques may impact the estimation results. For this reason, the policy model by Moro and Sckokai (1999) has been re-estimated using techniques recently developed in the econometric literature. The preliminary results show a strong impact on the estimations. This seems to suggest that the adoption of proper panel-data techniques is likely to be very important in order to obtain reliable estimates of...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural policy; Panel data; Systems of equations; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6693

Coordination after gains and losses: Is prospect theory’s value function predictive for games?
Provedor de dados: 31
Autores: Schade,   Christian; Schroeder,   Andreas; Krause,   Kai Oliver.
We analyze the effects of prior gain and loss experiences on individuals’ behavior in two coordination games: battle of the sexes and simultaneous market entry. We propose subjectively transformed games that integrate elements of prospect theory, aggregation of prior and subsequent payoffs, and social projection. Mathematical predictions of behavior are derived based on equilibrium selection concepts. Males’ behavior in our experimental studies is largely consistent with our predictions. However, the behavior of many female respondents appears to be rather consistent with interpreting the initial random lottery outcomes used to manipulate prior experiences as a signal for the players’ abilities to compete. This could be related to females’ known uneasiness...
Tipo: Working or Discussion Paper
Palavras-chave: Prospect Game Theory; Prior Outcomes; Coordination; Equilibrium Selection; Economic Experiment; Agribusiness; Agricultural and Food Policy; Financial Economics; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/59524

The Establishment of an Organic Farmers’ Market as a Training Case Study and Research for Graduate Students of Organic Agriculture at the University of Palermo
Provedor de dados: 31
Autores: Schifani,   Giorgio; Inglese,   Paolo; Noto,   Francesca; Migliore,   Giuseppina.
Despite the modest regional consumption of organic products, Sicily is one of the most important European regions in surface area per number of companies active in organic farming. The University of Palermo, as early as 2000, to promote the development and success in this industry, the Faculty of Agriculture, introduced two major degree programs in "Organic Farming". The objective of these courses is to train graduates who are technically capable of supporting the organic farmers market, to promote and facilitate the expansion of the consumption of organic products, and to create employment opportunities for young graduates. At the end of 2009, in the area of these activities, a training and research program involved numerous students in the creation of an...
Tipo: Article
Palavras-chave: Sustainability; Critical consumption; Solidarity Purchase Groups; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121949

The Regional Multi-Agent Simulator (RegMAS): assessing the impact of the "Health Check" in an Italian region
Provedor de dados: 31
Autores: Lobianco,   Antonello; Esposti,   Roberto.
Agent-based models (AMB) allow to conceive social systems as the result of individually-acting agents. When they are applied to agriculture, they can simulate the fundamental behaviour at the micro-level of the individual farmers, without the need of aggregating them in “representative” agents. RegMAS (Regional Multi Agent Simulator) is an open-source spatially explicit multi-agent model framework specifically designed for long-term simulations of effects of policies on agricultural systems. Using iterated conventional optimisation problems as agents' behavioural rules, it allows for a bidirectional integration between geophysical and social models where spatially distributed characteristics are taken into account in the linear programming problem of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Agent based model; Health check; Regional economics; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/44865

Demographic and Economic Profiling of U.S. Demand for Non-Alcoholic Beverages 1998-2003: A Household Level Two-Step Analysis
Provedor de dados: 31
Autores: Dharmasena,   Senarath; Capps,   Oral, Jr.
Tipo: Conference Paper or Presentation
Palavras-chave: Non-alcoholic beverages; Heckman two-step analysis; Demographic profiling; Probability of consumption; Level of consumption; Nielsen HomeScan data; Agricultural and Food Policy; Consumer/Household Economics; Research Methods/ Statistical Methods; D11; D12.
Ano: 2010
URL: http://purl.umn.edu/56257

AJAE Appendix: Estimability and Identifying the Estimability Status of a System of Restrictions
Provedor de dados: 31
Autores: Atwood,   Joseph A.; Robison-Cox,   James F.; Shaik,   Saleem.
The material contained herein is supplementary to the article named in the title and published in the American Journal of Agricultural Economics, Volume 88, Number 2, May 2006.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/7401

Confronting Uncertainty and Missing Values in Species Conservation Investment with Environmental Value Transfer
Provedor de dados: 31
Autores: Akter,   Sonia; Grafton,   R. Quentin.
Decision tools for species conservation, such as benefit cost analysis (BCA) and project prioritization protocol (PPP) use monetary values to measure benefits or to assign priorities across species. Non-use (or passive) values are an important, yet difficult to quantify, category of benefits. When not estimated they may be assigned a zero value by decision makers. This results in the under-provision of conservation dollars to substantial non-use values generating projects and actions.  To overcome the problem, we provide a guide to environmental value transfer (EVT) that allows decision makers to derive indirect estimates of non-use values. Environmental value transfer, together with consideration of estimated benefits uncertainty, promise better decision...
Tipo: Report
Palavras-chave: Environmental value transfer; Species conservation; Non-use values; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94826

A standard computable general equilibrium (CGE) model in GAMS
Provedor de dados: 31
Autores: Lofgren,   Hans; Harris,   Rebecca Lee; Robinson,   Sherman.
Over the past decade, the increasing power and reliability of microcomputers and the development of sophisticated software designed specifically for use with them has led to significant changes in the way quantitative food policy analysis is conducted. These changes cover most aspects of the analysis, ranging from the collections and analysis of socioeconomic data to the conduct of model-based policy simulations. The venue of the computations has shifted from off-site mainframes dependent on highly trained operators and significant capital investment in supporting equipment, to desktop and laptop computers dependent only on the occasional availability of electricity. This means that it is now feasible to quickly transfer new techniques between IFPRI and...
Tipo: Book
Palavras-chave: Agriculture; Economic aspects; Mathematical models; Food supply; Mathematical models; Equilibrium (Economics); Mathematical models; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/42483

Combining Consumer Valuation Research with Sensory Science Techniques: A Laboratory Experiment
Provedor de dados: 31
Autores: Gustafson,   Christopher R.; Lybbert,   Travis J.; Sumner,   Daniel A.
In this research, we integrated an experimental auction with sensory science techniques—namely, trained sensory panels used to analyze the sensory attributes of wines—to examine the effects of objective and sensory information in the market for California-produced Cabernet Sauvignons. The experiment permitted observation of consumer valuation for sensory attributes of wine, appellations, expert ratings, and wineries.  Participants submitted bids each time they received new information about the wines.  The balanced experimental design permits evaluation of the effects of consumer characteristics on attribute valuation.  We had 236 people participate in the research, which consisted of nine rounds of bidding and one round of hedonic liking scores. Rounds...
Tipo: Conference Paper or Presentation
Palavras-chave: Experimental Economics; Willingness to Pay; WTP; Wine; Consumer Valuation; Hedonic Pricing; Sensory Analysis; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103430

HYPOTHETICAL BIAS IN DICHOTOMOUS CHOICE CONTINGENT VALUATION STUDIES
Provedor de dados: 31
Autores: Ash,   Michael; Murphy,   James J.; Stevens,   Thomas H.
This paper uses a meta-analysis to explore the relationship between hypothetical bias and the price respondents are asked to pay.  For public goods, the results clearly indicate a difference in the price elasticity between hypothetical and actual payment conditions.  Since the bias increases for larger dollar amounts, any simple guidelines, such as NOAA's "divide by two" rule of thumb, could be misleading. Future attempts to calibrate contingent valuation responses should reflect this price sensitivity.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/14506

EFFICIENT ESTIMATES OF A MODEL OF PRODUCTION AND COST
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
In 1944, Marschak and Andrews published a seminal paper on how to obtain consistent estimates of a production technology.  The original formulation of the econometric model regarded the joint estimation of the production function together with the first-order necessary conditions for profit-maximizing behavior. In the seventies, with the advent of econometric duality, the preference seemed to have shifted to a dual approach. Recently, however, Mundlak resurrected the primal-versus-dual debate with a provocative paper titled “"Production Function Estimation: Reviving the Primal."” In that paper, the author asserts that the dual estimator, unlike the primal approach, is not efficient because it fails to utilize all the available information.  In this paper...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20358

Review of Multilevel and Longitudinal Modeling Using Stata, Second Edition, by Sophia Rabe-Hesketh and Anders Skrondal
Provedor de dados: 31
Autores: Horton,   Nicholas J.
This article reviews Multilevel and Longitudinal Modeling Using Stata, Second Edition, by Sophia Rabe-Hesketh and Anders Skrondal.
Tipo: Article
Palavras-chave: Multilevel; Longitudinal; Rabe-Hesketh; Skrondal; Mlmus2; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122625

Validating Hypothetical Surveys Using Binding Public Referenda: Implications for Stated Preference Valuation
Provedor de dados: 31
Autores: Johnston,   Robert J.; Joglekar,   Deepak P.
This study presents a criterion validity test in which stated choices are compared to subsequent binding referendum votes.  The study is distinguished by identical hypothetical and actual choice contexts, and results that show no evidence of hypothetical bias. Results suggest a number of possibilities for amelioration of hypothetical bias.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19519

Social Networks as an Integration Tool in Rural Areas – Agricultural Enterprises of the Czech Republic
Provedor de dados: 31
Autores: Cervenkova,   Eva; Simek,   Pavel; Vogeltanzova,   Tereza; Stoces,   Michal.
Social networks have been growing at a rapid pace. Social media represent one of the most significant phenomena of today's world and are more and more integrated from the private sphere into the commercial one (e.g. into marketing where social media already play a substantial role). The present paper is aimed at introducing an initial study on the use of social media in agricultural enterprises. The study was thus targeted at agricultural enterprises – both legal entities (public limited companies, limited liability companies and last but not least cooperatives) and natural persons (farmers) that farm the total area of more than 100 hectares (a basic selection criterion of the survey). This interesting study was conducted by means of a questionnaire survey...
Tipo: Journal Article
Palavras-chave: Social media; Social network; Facebook; Twitter; Google Buzz; Agrarian sector; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/102494

Facilitating access to rural services in Vietnam: The invisible social capital link
Provedor de dados: 31
Autores: Quoc,   Hoang Dinh; Dufhues,   Thomas; Buchenrieder,   Gertrud.
This paper investigates the effects of individual social capital on the access of rural households to services. In the context of agriculture economics, an innovative data collection approach is used to determine social capital. The approach originates from the field of sociology and entails a personal network survey. We define four social capital variables according to tie strength (bonding/bridging) and social distance (bondinglink/bridginglink) between the respondent and his/her network member. The econometric results suggest that social capital with weaker ties in combination with socially distant ties (bridginglink social capital) can potentially improve households’ access to rural services.
Tipo: Presentation
Palavras-chave: Consumer/Household Economics; Research Methods/ Statistical Methods; Rural services; Social capital; Rural households; Vietnam.
Ano: 2012
URL: http://purl.umn.edu/123402

Spatial Pricing Patterns of Cellulosic Biomass under Oligopsony – A Multi-agent Simulation Model
Provedor de dados: 31
Autores: Kumarappan,   Subbu.
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Industrial Organization; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/103623

Stata tip 58: nl is not just for nonlinear models
Provedor de dados: 31
Autores: Poi,   Brian P.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120938

Meta–regression in Stata
Provedor de dados: 31
Autores: Harbord,   Roger M.; Higgins,   Julian P.T.
We present a revised version of the metareg command, which performs meta-analysis regression (meta-regression) on study-level summary data. The major revisions involve improvements to the estimation methods and the addition of an option to use a permutation test to estimate p-values, including an adjustment for multiple testing. We have also made additions to the output, added an option to produce a graph, and included support for the predict command. Stata 8.0 or above is required.
Tipo: Article
Palavras-chave: Metareg; Meta-regression; Meta-analysis; Permutation test; Multiple testing; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122617

STATLAB ANNUAL REPORT, 2002
Provedor de dados: 31
Autores: Rejto,   Lidia; Cho,   Seoae; Ilvento,   Thomas W.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/15822

What are the social impacts of land use restrictions on local communities? Empirical evidence from Costa Rica
Provedor de dados: 31
Autores: Andam,   Kwaw S.; Ferraro,   Paul J.; Holland,   Margaret B.
Global efforts to reduce deforestation rely heavily on protected areas and land use restrictions.  The effect of these restrictions on local communities is currently the subject of heated debate among conservation and development experts.  Measuring the social impacts of protected areas is difficult because the effects cannot be isolated from other factors, given the nonrandom placement of protection.  We address this problem by applying a quasi-experimental approach to establish the counterfactual (“what would have been the socioeconomic outcome if a protected area had not been established?”).  We use matching methods to measure the impacts of pre-1980 protected areas in Costa Rica on socioeconomic outcomes in 2000.  In 2000, neighboring communities near...
Tipo: Conference Paper or Presentation
Palavras-chave: Forest conservation; Social impacts; Quasi-experimental methods; Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Food Security and Poverty; International Development; Land Economics/Use; Research Methods/ Statistical Methods; C14; O13; Q23.
Ano: 2009
URL: http://purl.umn.edu/51783

Contracting with Smallholders under Joint Liability
Provedor de dados: 31
Autores: Kaminski,   Jonathan.
Replaced with revised version of paper Jan. 11, 2012
Tipo: Working or Discussion Paper
Palavras-chave: Contract farming; Moral hazard; Joint liability; Peer monitoring; Agricultural Finance; Consumer/Household Economics; Farm Management; Financial Economics; Public Economics; Research Methods/ Statistical Methods; D82; L14; 013; Q13.
Ano: 2009
URL: http://purl.umn.edu/93128

A VÁLLALKOZÁSOK EGYENSÚLYI HELYZETÉNEK VÁLTOZÁSKÖVETŐ VIZSGÁLATA
Provedor de dados: 31
Autores: Reke,   Barnabas.
The publicity of annual reports enable competition by providing the inputs and outputs that can be analysed by simple as well as sophisticated methods Several of my studies showed the quality of the financial balance of enterprises based on financial reports using factoranalytics, clusteranalytics etc. [Reke, 1997] Market participants required a simple method that indicates changes based on these balance indicators. In my opinion the answer is the longitude-panel examination method, which is able to show changes during a longer period relatively easily supporting the controlling of enterprises.
Tipo: Book
Palavras-chave: Versenyhelyzet; Éves beszámolók; Longitudinális vizsgálatok; Változáskövetés; Competitveness; Yearly financial report; Longitudinal analyses; Agribusiness; Agricultural Finance; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43330

Stata tip 28: Precise control of dataset sort order
Provedor de dados: 31
Autores: Schumm,   L. Philip.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117564

Efficient Estimates of a Model of Production and Cost
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
In 1944, Marschak and Andrews published a seminal paper on how to obtain consistent estimates of a production technology. The original formulation of the econometric model regarded the joint estimation of the production function together with the first-order necessary conditions for profit-maximizing behavior. In the seventies, with the advent of duality theory, the preference seemed to have shifted to a dual approach. Recently, however, Mundlak resurrected the primal-versus-dual debate with a provocative paper titled “Production Function Estimation: Reviving the Primal.” In that paper, the author asserts that the dual estimator, unlike the primal approach, is not efficient because it fails to utilize all the available information. In this paper we argue...
Tipo: Working or Discussion Paper
Palavras-chave: Primal; Dual; Cobb-Douglas; Nonlinear errors-in-variables; Productivity Analysis; Research Methods/ Statistical Methods; D0; C3.
Ano: 2004
URL: http://purl.umn.edu/93742

VALUATION OF EXTERNALITIES IN WATER, FORESTS AND ENVIRONMENT FOR SUSTAINABLE DEVELOPMENT
Provedor de dados: 31
Autores: Verghese,   Shalet K.; Manjunatha,   A.V.; Poornima,   K.N.; Akarsha,   B.M.; Rashmi,   N.; Tejaswi,   Pillenahalli Basavarajappa; Saikumar,   B.C.; Jeevarani,   A.K.; Accavva,   M.S.; Amjath Babu,   T.S.; Suneetha,   M.S.; Unnikrishnan,   P.M.; Deshpande,   R.S.; Nagaraj,   N.; Chandrashekar,   H.; Bhat,   Mahadev G.; Chengappa,   P.G.; Mundinamani,   S.M.; Shanmugam,   T.R.; Chandrakanth,   Mysore G.
Paper presented at EAAE 2008 Congress
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer/Household Economics; Demand and Price Analysis; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Externalities; Environmental services; Sustainable development.
Ano: 2008
URL: http://purl.umn.edu/43617

AN ASSESSMENT OF DYNAMIC BEHAVIOR IN THE U.S. CATFISH MARKET: AN APPLICATION OF THE GENERALIZED DYNAMIC ROTTERDAM MODEL
Provedor de dados: 31
Autores: Muhammad,   Andrew; Jones,   Keithly G.
Dynamic demand systems have been employed in a number of studies to account for habit formation and inventory adjustments in demand. Few studies have attempted to provide a theoretical foundation for the dynamic demand structures employed. Recently, Bushehri (2003) showed how a generalized dynamic Rotterdam model could be derived from the neoclassical intertemporal utility maximization problem; however, no empirical application is provided in his study. This paper provides an empirical application of the generalized dynamic Rotterdam model to the demand for processed catfish products in the U.S. The two-period dynamic Rotterdam model explained a significant amount of the variation in U.S. catfish demand and was preferred to the one-period and static...
Tipo: Conference Paper or Presentation
Palavras-chave: Dynamic; Rotterdam model; Catfish; Demand; Partial adjustment; Demand and Price Analysis; Research Methods/ Statistical Methods; Q11; Q13.
Ano: 2008
URL: http://purl.umn.edu/45912

Modern Supply Chains and Product Innovation: How Can Smallholder Farmers Benefit?
Provedor de dados: 31
Autores: Schipmann,   Christin; Qaim,   Matin.
There is an emerging body of literature analysing how smallholder farmers in developing countries can benefit from modern supply chains. However, most of the available studies concentrate on export markets and fail to capture spillover effects that modern supply chains may have on local markets. Here, we analyse the case of sweet pepper in Thailand, which was initially introduced as a product innovation in modern supply chains, but which is now widely traded also in more traditional markets. Using survey data from smallholder farmers and econometric techniques, we show that sweet pepper cultivation contributes significantly to higher household incomes. Strikingly, at this stage, participation in modern supply chains does not lead to higher incomes than...
Tipo: Conference Paper or Presentation
Palavras-chave: Adoption; Duration analysis; Impact assessment; Modern supply chains; Product innovation; Sweet pepper; Thailand; Community/Rural/Urban Development; Marketing; Research Methods/ Statistical Methods; C21; C25; C41; Q13.
Ano: 2009
URL: http://purl.umn.edu/51046

Parameters behind “nonparametric” statistics: Kendall's tau, Somers' D and median differences
Provedor de dados: 31
Autores: Newson,   Roger.
So-called “nonparametric” statistical methods are often in fact based on population parameters, which can be estimated (with confidence limits) using the corresponding sample statistics. This article reviews the uses of three such parameters, namely Kendall’s τα Somers’ D, and the Hodges–Lehmann median difference. Confidence intervals for these are demonstrated using the somersd package. It is argued that confidence limits for these parameters, and their differences, are more informative than the traditional practice of reporting only p-values. These three parameters are also important in defining other tests and parameters, such as the Wilcoxon test, the area under the receiver operating characteristic (ROC) curve, Harrell’s C, and the Theil median slope.
Tipo: Journal Article
Palavras-chave: Confidence intervals; Gehan test; Harrell's C; Hodges–Lehmann median difference; Kendall's tau; Nonparametric methods; Rank correlation; Rank-sum test; ROC area; Somers' D; Theil median slope; Wilcoxon test; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115950

Visualizing main effects and interactions for binary logit models
Provedor de dados: 31
Autores: Mitchell,   Michael N.; Chen,   Xiao.
This paper considers the role of covariates when using predicted probabilities to interpret main effects and interactions in logit models. While predicted probabilities are very intuitive for interpreting main effects and interactions, the pattern of results depends on the contribution of covariates. We introduce a concept called the covariate contribution, which reflects the aggregate contribution of all of the remaining predictors (covariates) in the model and a family of tools to help visualize the relationship between predictors and the predicted probabilities across a variety of covariate contributions. We believe this strategy and the accompanying tools can help researchers who wish to use predicted probabilities as an interpretive framework for...
Tipo: Journal Article
Palavras-chave: Logistic regression; Predicted probabilities; Main effects; Interactions; Covariate contribution; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117500

RETURNS TO SCALE AND SIZE IN AGRICULTURAL ECONOMICS
Provedor de dados: 31
Autores: McClelland,   John W.; Wetzstein,   Michael E.; Musser,   Wesley N.
Differences between the concepts of returns to size and returns to scale are systematically reexamined in this paper.  Specifically, the relationship between returns to scale and size are examined through the use of the envelope theorem.  A major conclusion of the paper is that the level of abstraction in applying a cost function derived from a homothetic technology within a relevant range of the expansion path may not be severe when compared to the theoretical, estimative, and computational advantages of these technologies.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/32252

The Economics of Inaction on Climate Change: A Sensitivity Analysis
Provedor de dados: 31
Autores: Ackerman,   Frank; Finlayson,   Ian J.
Economic models of climate change often take the problem seriously, but paradoxically conclude that the optimal policy is to do almost nothing about it. We explore this paradox as seen in the widely used DICE model. Three aspects of that model, involving the discount rate, the assumed benefits of moderate warming, and the treatment of the latest climate science, are sufficient to explain the timidity of the model's optimal policy recommendation. With modifications to those three points, DICE shows that the optimal policy is a much higher and rapidly rising marginal carbon price; that higher carbon price has a greater effect on physical measures of climate impacts. Our modifications exhibit nonlinear interactions; at least at low discount rates, there is...
Tipo: Working or Discussion Paper
Palavras-chave: Demand and Price Analysis; Environmental Economics and Policy; Financial Economics; Political Economy; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2006
URL: http://purl.umn.edu/37277

Energy efficiency, innovation, and job creation in California
Provedor de dados: 31
Autores: Roland-Holst,   David W.
Global climate change poses significant risks to the California economy. Recognizing and responding to these threats, Governor Schwarzenegger signed Executive Order #S-3-05 (Schwarzenegger 2005) which called for a 30 percent reduction below business-as-usual of greenhouse gas emissions by 2020 and 80 percent below 1990 levels by 2050. In September 2006, the California legislature passed and Governor Schwarzenegger signed into law the historic Global Warming Solutions Act (AB 32), which mandates a first-in-the-nation limit on emissions that cause global warming. In June 2006, the California Air Resources Board (CARB) released a “Draft Scoping Plan” – the policy roadmap to meet the emissions reduction target of 169 Million Metric Tons of Carbon (MMTCO2)...
Tipo: Working or Discussion Paper
Palavras-chave: Energy; Sustainability; Climate change; Economic policy; Energy policy; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2008
URL: http://purl.umn.edu/46718

Exogenous Targeting Instruments under Differing Information Conditions
Provedor de dados: 31
Autores: Spraggon,   John M.
This paper tests the ability of an exogenous targeting instrument to induce compliance when the principal cannot observe the actions of individual agents. A number of papers show that although these instruments are able to induce groups to the target outcome, they are not able to induce individuals to make socially optimal decisions in a number of different controlled laboratory experiments. This study investigates whether the information individuals have about others’ payoffs affects how they make their decisions in this environment. Ledyard (1995) suggests that when subjects have less information in public goods experiments they are more likely to choose the Nash equilibrium decision. However, as he points out, this effect differs between groups with...
Tipo: Working or Discussion Paper
Palavras-chave: Moral Hazard in Groups; Exogenous Targeting Instruments; Experiments; Information; Research Methods/ Statistical Methods; C72; C92; D70.
Ano: 2007
URL: http://purl.umn.edu/7383

A Dynamic Optimal Crop Rotation Model in Acreage Response
Provedor de dados: 31
Autores: Cai,   Ruohong; Bergstrom,   John C.; Mullen,   Jeffrey D.; Wetzstein,   Michael E.
This paper presents a dynamic crop rotation model that shows how crop yield and price volatility could impact crop mix and acreage response under crop rotation considerations. Specifically, a discrete Markov decision model is utilized to optimize producers’ crop rotation decision within a finite horizon. By maximizing net present value of expected current and future profits, a modified Bellman equation helps develop optimum planting decisions. This model is capable of simulating crop rotations with different lengths and structures. Specifically, the corn-soybeans rotations were simulated using the crop rotation model.
Tipo: Working or Discussion Paper
Palavras-chave: Crop rotation; Acreage response; Bellman equation; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103949

EFFEKTE EINER EU-AGRARMARKTLIBERALISIERUNG AUF BETRIEBSEBENE: SIMULATIONEN ANHAND EINES EUROPÄISCHEN AGRARSEKTORMODELLS UND EINES ANGEBOTSMODELLS FÜR DEN DEUTSCHEN AGRARSEKTOR
Provedor de dados: 31
Autores: Deppermann,   Andre; Grethe,   Harald; Offermann,   Frank.
C3_1
Tipo: Conference Paper or Presentation
Palavras-chave: Verlinkung von Modellen; Politikfolgenabschätzung; Einkommenswirkung; Agricultural Finance; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93958

Taste Indicators and Heterogeneous Revealed Preferences for Congestion in Recreation Demand
Provedor de dados: 31
Autores: Lavin,   Felipe Vasquez; Hanemann,   W. Michael.
Researchers using revealed preference data have mostly relied on the Mixed Logit (ML) framework to model unobserved heterogeneity. In this paper, we suggest an extension of this model where we integrate direct measures of taste and revealed preferences, under a unified econometric setting, to describe heterogeneous preferences for congestion in recreation demand. ML is a random parameter discrete choice model, which decomposes the coefficients of the regression equation into a mean effect shared by all individuals in the sample, and a deviation with respect to this mean, specific to each individual. Within this structure, heterogeneity is summarized using a parametric density function for the coefficients of the model. From this distribution one can...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/47041

NAREA Awards
Provedor de dados: 31
NAREA Outstanding Master's Thesis Award, NAREA Master's Thesis Award of Merit, NAREA Distinguished Member Awards, NAREA Award for Outstanding Public Service Through Economics, and NAREA's Journal Article of the Year for 2008
Tipo: Journal Article
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Industrial Organization; Institutional and Behavioral Economics; International Development; International Relations/Trade; Labor and Human Capital; Land Economics/Use; Livestock Production/Industries; Marketing; Political Economy; Production Economics; Productivity Analysis; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/55555

GENERALIZED LEAST SQUARES WITH AN ESTIMATED COVARIANCE MATRIX -- A SAMPLING EXPERIMENT
Provedor de dados: 31
Autores: Griffiths,   William E.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1971
URL: http://purl.umn.edu/13370

Graphing confidence ellipses: An update of ellip for Stata 8
Provedor de dados: 31
Autores: Alexandersson,   Anders.
This paper describes an update of the ellip command for graphing confidence ellipses in Stata 8. Two of the most notable new features are the option to graph confidence ellipses around variable means and the ability to add inscribed lines. These features allow a geometric characterization of linear regression with unequal error variances, as in McCartin (2003).
Tipo: Journal Article
Palavras-chave: Ellip; Confidence ellipse; Error-variance regression; Elliptical distribution; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116245

MODELING HETEROGENEITY IN PRODUCTION MODELS: EMPIRICAL EVIDENCE FROM INDIVIDUAL FARMING IN POLAND
Provedor de dados: 31
Autores: Hockmann,   Heinrich; Pieniadz,   Agata; Goraj,   Lech.
This discussion paper deals with the estimation of a random coefficient model. The virtue of this approach is that it considers firm heterogeneity, which conventional SFA models do not. Applying the model to Polish farms, the results indicate that the conventional random and fixed effect models overestimate the inefficiency score. In addition, the reasons for inefficiency are analyzed. It is shown that despite the fragmentation of Polish agriculture, there is no evidence for scale inefficiency. Moreover, inefficiency could partly be attributed to factors, which affect the management input and requirements on farms.
Tipo: Working or Discussion Paper
Palavras-chave: SFA; Random component model; Poland; Management.; Agribusiness; Farm Management; Productivity Analysis; Research Methods/ Statistical Methods; Q12; D24.
Ano: 2007
URL: http://purl.umn.edu/91733

Two Sides of the Same Coin? Analysis of the Web‐based Social Media with Regard to the Image of the Agri‐food Sector in Germany
Provedor de dados: 31
Autores: Kayser,   Maike; Boehm,   Justus; Spiller,   Achim.
The agri‐food industry has improved its productivity, especially in developed countries, in an unparalleled way. This development has, however, estranged the agri‐food sector in parts from society over the years. Never before has food been as safe and secure, but simultaneously, society has become increasingly critical towards agricultural and food related issues. In the following, this two‐sided development between society and agribusiness ‐ the existence of two sides of the same coin ‐ will be analyzed using framing theory, which is based on media research that complex issues are simplified and reduced in order to improve understanding. An innovative technique was applied, analyzing the web‐based social media in Germany. 50,931 web posts were collected...
Tipo: Conference Paper or Presentation
Palavras-chave: Agri‐Food Industry; Framing; Image; Issue Management; Social Media; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100587

Estimation and Statistical Inference in Economics
Provedor de dados: 31
Autores: Judge,   George G.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/95543

India’s Agrarian Crisis and Corporate-Led Contract Farming: Socio-economic Implications for Smallholder Producers
Provedor de dados: 31
Autores: Sharma,   Vijay Paul.
The paper discusses India’s agrarian crisis and the role of corporate-led contract farming in addressing these crisis. A two-stage Heckman model was used to explain determinants of participation in contract farming, and whether participation in contract farming affects farm income. The results indicate that contract farming has a positive impact on crop productivity and farm income. The socio-economic factors that influenced participation in contract farming were education, age, farm size, access to institutional credit, source of off-farm income and membership to an organization. Factors related to the likelihood of participation in contract farming slightly differed from the factors affecting farm income.
Tipo: Journal Article
Palavras-chave: Agrarian crisis; Smallholder producer; Corporate-led contract farming; Agricultural Produce Marketing (APMC) Act; Heckman model; Institutional and Behavioral Economics; Marketing; Research Methods/ Statistical Methods; Q10; Q13.
Ano: 2008
URL: http://purl.umn.edu/53735

Maximum likelihood estimation of endogenous switching and sample selection models for binary, ordinal, and count variables
Provedor de dados: 31
Autores: Miranda,   Alfonso; Rabe-Hesketh,   Sophia.
Studying behavior in economics, sociology, and statistics often involves fitting models in which the response variable depends on a dummy variable—also known as a regime-switch variable—or in which the response variable is observed only if a particular selection condition is met. In either case, standard regression techniques deliver inconsistent estimators if unobserved factors that affect the response are correlated with unobserved factors that affect the switching or selection variable. Consistent estimators can be obtained by maximum likelihood estimation of a joint model of the outcome and switching or selection variable. This article describes a “wrapper” program, ssm, that calls gllamm (Rabe-Hesketh, Skrondal, and Pickles, GLLAMM Manual [University...
Tipo: Journal Article
Palavras-chave: Endogenous switching; Sample selection; Binary variable; Count data; Ordinal variable; Probit; Poisson regression; Adaptive quadrature; Gllamm; Wrapper; Ssm; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117582

An Analysis of Food Grain Consumption in Urban Jiangsu Province of China
Provedor de dados: 31
Autores: Zheng,   Zhihao; Henneberry,   Shida Rastegari.
The impacts of economic and demographic variables on the demand for food grain commodities in urban Jiangsu province of China are estimated, using both the QUAIDS and the AIDS models. Results show that the demands for wheat flour and coarse grains are price-elastic while the demands for rice and grain products are price-inelastic. Certain demographic variables show as having a significant impact on food grain demand. Finally, a decomposition of causes of changes in rice consumption over the period of 1995–2007 is performed.
Tipo: Journal Article
Palavras-chave: AIDS model; China food grain demand; China urban household demand; Agribusiness; Community/Rural/Urban Development; Crop Production/Industries; Demand and Price Analysis; Farm Management; Food Consumption/Nutrition/Food Safety; International Development; Production Economics; Public Economics; Research Methods/ Statistical Methods; D12; Q18; Q13.
Ano: 2010
URL: http://purl.umn.edu/90677

Haplotype analysis in population-based association studies
Provedor de dados: 31
Autores: Mander,   Adrian P.
This paper describes how to use the command hapipf and introduces the command profhap written for Stata that analyzes population-based genetic data. For these studies, association can be linkage disequilibrium within a set of loci or allelic/haplotype association with disease status. Confidence intervals for odds ratios are calculated with or without adjustment for possible factors that are confounding the relationship. Additionally, this command allows the specification of many models of association that are not widely implemented.
Tipo: Journal Article
Palavras-chave: Haplotype analysis; Association tests; Profile likelihood; Odds ratio; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115936

A Semi-Parametric Basis for Combining Estimation Problems Under Quadratic Loss
Provedor de dados: 31
Autores: Judge,   George G.; Mittelhammer,   Ronald C.
When  there  is  uncertainty  concerning  the  appropriate  statistical  model  to  use  in  representing the data sampling process and corresponding estimators, we consider a basis for optimally combining estimation  problems.    In the context of the multivariate linear  statistical model, we consider a semi-parametric  Stein-like (SPSL) estimator, ...that shrinks to a random data-dependent vector and, under quadratic loss, has superior performance relative to the conventional least squares estimator. The relationship of the SPSL estimator to the family of Stein estimators is noted and risk dominance extensions between correlated estimators are demonstrated.  As an application we consider the problem of a possibly ill-conditioned design matrix and devise...
Tipo: Working or Discussion Paper
Palavras-chave: Stein-like shrinkage; Quadratic loss; Ill-conditioned design; Semiparametric estimation and inference; Data dependent shrinkage vector; Asymptotic and finite sample risk.; Research Methods/ Statistical Methods; Cl0; C24.
Ano: 2003
URL: http://purl.umn.edu/25103

European Preferences for Pork Product and Process Attributes: A Generalized Random Utility Model for Ranked Outcome
Provedor de dados: 31
Autores: Caracciolo,   Francesco; Cembalo,   Luigi; Cicia,   Gianni; Del Giudice,   Teresa.
The agri‐food sector and food consumption models have experienced both worldwide and in Europe a process of change that still appears ongoing. The main effects of this change are clearly visible in a whole series of new developments. The most interesting of these appears to be the role played by food product quality as a basis on which to implement modern marketing policies targeting an increasingly segmented market. This obviously makes it necessary for food consumption analysts to shed light on what it means, within today’s European and world consumption scenarios, to produce quality goods. On this point, in recent years the concept of quality may be said to have undergone rapid evolution. Quality has gone from meaning only intrinsic product attributes,...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100466

GIS as spatial decision support system
Provedor de dados: 31
Autores: Halbich,   Cestmir; Vostrovsky,   Vaclav.
This paper describes the possibility of the Geographic Information Systems (GIS) as a means to support decision making in solving spatial problems. Spatial problems accompany every human activity, of which agriculture is no exception. The solutions to these problems requires the application of available knowledge in the relevant decision-making processes. GISs integrate hardware, software, and data for capturing, managing, analyzing, and displaying all forms of geographically referenced information. Coupled with GISs, geography helps to better understand and apply geographic knowledge to a host of global problems (unemployment, environmental pollution, the loss of arable land, epidemics etc.). The result may be a geographical approach represents a new way...
Tipo: Journal Article
Palavras-chave: Knowledge; Semi-structural spatial decision problem; Spatial decision support system; Geographic Information System; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/109739

MELE: MAXIMUM ENTROPY LEUVEN ESTIMATORS
Provedor de dados: 31
Autores: Paris,   Quirino.
Multicollinearity hampers empirical econometrics. The remedies proposed to date suffer from pitfalls of their own. The ridge estimator is not generally accepted as a vital alternative to the ordinary least-squares (OLS) estimator because it depends upon unknown parameters. The generalized maximum entropy (GME) estimator of Golan, Judge and Miller depends upon subjective exogenous information that affects the estimated parameters in an unpredictable way.  This paper presents novel maximum entropy estimators inspired by the theory of light that do not depend upon any additional information. Monte Carlo experiments show that they are not affected by any level of multicollinearity and dominate OLS uniformly. The Leuven estimators are consistent and...
Tipo: Working or Discussion Paper
Palavras-chave: Multicollinearity; Mean squared error; Ordinary least squares; Generalized maximum entropy; Research Methods/ Statistical Methods; C2.
Ano: 2001
URL: http://purl.umn.edu/11991

Is Choice Modelling Really Necessary? Public versus expert values for marine reserves in Western Australia
Provedor de dados: 31
Autores: Rogers,   Abbie A.
One of the motivations for choice modelling is to provide values that can be used to inform decisionmakers about the non-market costs and benefits of proposed projects or policies. However, the question must be asked as to whether decision-makers consider choice modelling to be a policy relevant tool. There may be more cost-effective and convenient means of providing comparable policy guidance than commissioning a choice modelling study. For example, advice on decision options may be sought from experts, such as scientists. However, expert advice may not accurately reflect the value judgements of the public. The aim of this study is to investigate whether public and expert preferences diverge, using the choice modelling technique. Two case studies are...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice modelling; Valuation; Experts; Public; Marine parks; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/100704

2nd Forum on Irrigation and water for sustainable development: 15 –16 December, 2008 Ghion Hotel, Addis Ababa, Ethiopia
Provedor de dados: 31
Autores: Awulachew,   Seleshi Bekele; Erkossa,   Teklu; Balcha,   Yodit.
Tipo: Presentation
Palavras-chave: Sustainable development; Irrigation management; Irrigation water; Irrigated farming; Irrigation systems; Supplemental irrigation; Land management; Land use; Investment; Case studies; Government policy; Rural poverty; Groundwater; Small scale systems; Socioeconomic development; Economic aspects; Economic growth; Income; Water management; Water resources development; Water harvesting; Water supply; Public policy; Agricultural production; Developing countries; Public-private cooperation; History; Case studies; River basins; Crop production; Agricultural and Food Policy; Agricultural Finance; Crop Production/Industries; Farm Management; Financial Economics; Food Security and Poverty; Institutional and Behavioral Economics; Land Economics/Use; Production Economics; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/118411

Revised empirical likelihood
Provedor de dados: 31
Autores: Grendar,   Marian; Judge,   George G.
Empirical Likelihood (EL) and other methods that operate within the Empirical Estimating Equations (E3) approach to estimation and inference are challenged by the Empty Set Problem (ESP). ESP concerns the possibility that a model set, which is data-dependent, may be empty for some data sets. To avoid ESP we return from E3 back to the Estimating Equations, and explore the Bayesian infinite-dimensional Maximum A-posteriori Probability (MAP) method. The Bayesian MAP with Dirichlet prior motivates a Revised EL (ReEL) method. ReEL i) avoids ESP as well as the convex hull restriction, ii) attains the same basic asymptotic properties as EL, and iii) its computation complexity is comparable to that of EL.
Tipo: Working or Discussion Paper
Palavras-chave: Empirical estimating equations; Generalized minimum contrast; Empirical likelihood; Generalized empirical likelihood; Empty set problem; Convex hull restriction; Estimating equations; Maximum aposteriori probability; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/91799

The impact of property rates on agricultural land, focusing on the KwaZulu-Natal
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005. This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the other...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58096

Agricultural Production Function Studies
Provedor de dados: 31
Autores: Woodworth,   Roger C.
Tipo: Book
Palavras-chave: Production Economics; Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/96820

RESERVATION PRICE ANNOUNCEMENT IN SEALED BID AUCTIONS: COMMENT
Provedor de dados: 31
Autores: Schroeter,   John R.
This comment corrects some errors of analysis contained in a 1993 paper by Carey in the Journal of Industrial Economics.
Tipo: Working or Discussion Paper
Palavras-chave: Auction; Reservation price; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/18261

CONSUMERS’ WILLINGNESS TO PAY FOR MILK QUALITY ATTRIBUTES
Provedor de dados: 31
Autores: Berges,   Miriam E.; Casellas,   Karina S.
This study was financed by Project ALCUE-FOOD. Work package 3 (INTA, COPAL, EMBRAPA, CIRAD, CECYT, INIA, INAP). “From European fork to Latin American farm”: an innovative networking platform for EU–LAC partnerships in food quality and safety R&amp;D
Tipo: Conference Paper or Presentation
Palavras-chave: Willingness to pay; Quality attributes; Fluid milk; Contingent Valuation; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; C25; D13.
Ano: 2009
URL: http://purl.umn.edu/51746

The use of an integrated model of pest spread and commodity markets to estimate the cost of a pest outbreak
Provedor de dados: 31
Autores: Hafi,   Ahmed.
There are significant benefits in integrating a biological spread model into economic assessment of the cost of pest incursions (such as varroa mite or Mexican feather grass) on agricultural industries. To illustrate the potential usefulness of an integrated approach, a generic bioeconomic model is developed by linking a simple stochastic pest spread module, built around a set of logistic spread equations, and a partial equilibrium module of the market for an affected agricultural industry. The pest spread module estimates the damage over time, while the partial equilibrium module estimates the resultant effect of a reduction in supply on the commodity market. The estimated effects on market variables are then used to estimate the cost of a pest outbreak....
Tipo: Conference Paper or Presentation
Palavras-chave: Pest spread; Logistic functions and partial equilibrium model; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/100554

Stata and the WeeW information system
Provedor de dados: 31
Autores: Vittorini,   Pierpaolo; Necozione,   Stefano; di Orio,   Ferdinando.
The need for timely collection and analysis of epidemiological data is becoming of primary importance, e.g., for bioterrorism detection or epidemiological surveillance. Web-based information systems (WISs) may provide the needed technological support. Thus we present the WeeW (workflow-enabled epidemiological WIS) system—i.e., a WIS that helps epidemiologists, through workflow management, to effectively select remote centers, collect, and process the received data to produce conclusive technical reports. In detail, we show the functionalities of the WeeW system, its architecture, and particularly Stata’s role in executing statistical analyses and producing graphs. Furthermore, we discuss the performance of the WeeW–Stata interface. Finally, we outline...
Tipo: Article
Palavras-chave: WeeW; Web-based information systems; Epidemiology; Web development; Benchmarks; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119256

The Transfer of Benefit Measures: The Applicability Conditions and the Results
Provedor de dados: 31
Autores: Stellin,   Giuseppe; Candido,   Alice.
The benefit transfer refers to the use and adaptation of benefit measures obtained for a specific site (study site), to assess the benefits in another site (policy site), for which no original valuation is possible. Relying on relatively simplicity of application, and allowing saving time and money for the implementation, it represents a ‘second best’ solution and a valid alternative to the disregarding environmental economic values. The literature broadly agrees in considering two main approaches to benefit transfer: the transfer of a value or of a benefit function. The choice of the more suitable approach relies on the number of potential primary studies, the similarity degree between the study and the policy sites, on the purposes of the assessment and...
Tipo: Conference Paper or Presentation
Palavras-chave: Benefit measures; Transfer; Similarity conditions; Validity tests; Transfer error; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/6627

The application of multivariate statistical methods for understanding food consumer behaviour
Provedor de dados: 31
Autores: Lakner,   Zoltan; Hajdu,   Istvanne; Banati,   Diana; Szabo,   Erzsebet; Kasza,   Gyula.
Understanding consumer behaviour is a necessary precondition for a targeted communication strategy. The behaviour is a complex phenomenon and research needs to undertake a rigorously apply sophisticated methods. This article entails the combined utilisation of categorical principal component analysis and cluster analysis to determine the major, relatively homogenous consumer groups and this is coupled with confirmatory factor analysis and structural model building to understand consumer behaviour, based on Fishbein and Ajzent’s theoretic model.
Tipo: Journal Article
Palavras-chave: Categorical principal component analysis; Cluster analysis; Confirmatory factor analysis; Consumers’ segmentation; Structural model building; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/107651

Review of A Short Introduction to Stata For Biostatistics by Hills and De Stavola
Provedor de dados: 31
Autores: McGready,   John.
This article reviews A Short Introduction to Stata for Biostatistics by Hills and De Stavola.
Tipo: Journal Article
Palavras-chave: Biostatistics; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116036

A Note on the Use of a Logarithmic Time Trend
Provedor de dados: 31
Autores: Watts,   Geof; Quiggin,   John C.
It is shown that parameter estimates in a regression with a logarithmic time trend are not invariant to the choice of the starting point of that time trend. Possible solutions to this problem are discussed and applied to data from a recent article in this Review where a logarithmic time trend was included. It is suggested that the appropriate course is either to estimate the starting date directly or to adopt a functional form invariant to the choice of starting date.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/12259

Fear or greed? Duty or solidarity? Motivations and the development of sociocognitive and moral reasoning: experimental evidences from public-goods provision dilemmas
Provedor de dados: 31
Autores: Meyer,   Leandro Fredrico Ferraz; Braga,   Marcelo Jose.
The paper presents results connecting the participant’s motivations and behaviors in a step-level give some dilemma with the constructs in a selected theory of adult personality systems development including value judgment and moral reasoning.
Tipo: Conference Paper or Presentation
Palavras-chave: Public-goods; Experimental economics; Psychosocial development; Community/Rural/Urban Development; Environmental Economics and Policy; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; C72; C92; D74.
Ano: 2009
URL: http://purl.umn.edu/51339

HOMOGENEITY AND SUPPLY
Provedor de dados: 31
Autores: LaFrance,   Jeffrey T.; Pope,   Rulon D.
Supply functions in the ubiquitous Gorman class are examined for their homogeneity properties. Homogeneity places surprisingly strong restrictions on functional forms. These forms facilitate testing of aggregability given homogeneity or homogeneity given aggregability or testing both.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/6863

THE INFLUENCES OF PERCEIVED FOOD ATTRIBUTES ON CONSUMER PREFERENCES FOR ORGANIC AND GMO FOODS
Provedor de dados: 31
Autores: Tavernier,   Edmund M.; Onyango,   Benjamin M.; Pray,   Carl E.
This paper uses a logistic regression model to examine consumer willingness to buy organic and/or GM food products in the context of food attributes that are considered important in the consumption decision.  That model is chosen for its mathematical simplicity and because its asymptotic characteristic constrains the predicted probabilities to a range between zero and one.  In particular, the model examines the process that shapes food preferences in the absence or presence of specific food attributes.  The paper finds that food attributes related to health, naturalness, familiarity, vegetarian-vegan, production location, and availability are critical in the acceptance of the organic and/or GM foods. The results show that food naturalness is pivotal to the...
Tipo: Conference Paper or Presentation
Palavras-chave: Organic food; Consumer willingness; Food naturalness. GMO. Food attributes; Agribusiness; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/36969

Bayesian analysis in Stata with WinBUGS
Provedor de dados: 31
Autores: Thompson,   John M.; Palmer,   Tom M.; Moreno,   Santiago G.
WinBUGS is a program for Bayesian model fitting by Gibbs sampling. WinBUGS has limited facilities for data handling, whereas Stata has no routines for Bayesian analysis; therefore, much can be gained by running Stata and WinBUGS together. We present a set of ado-files that enable data to be processed in Stata and then passed to WinBUGS for model fitting; finally, the results are read back into Stata for further processing.
Tipo: Article
Palavras-chave: Wbarray; Wbdata; Wbscalar; Wbstructure; Wbvector; Wbrun; Wbscript; Wbcoda; Wbac; Wbbgr; Wbgeweke; Wbintervals; Wbsection; Wbtrace; Wbstats; Wbdensity; Wbdic; Wbbull; Wbdecode; Bayesian methods; MCMC; Gibbs sampling; WinBUGS; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119243

Simple Computational Methods for Measuring the Difference of Empirical Distributions: Application to Internal and External Scope Tests in Contingent Valuation
Provedor de dados: 31
Autores: Poe,   Gregory L.; Giraud,   Kelly L.; Loomis,   John B.
Tipo: Working Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/121130

Network of Commons
Provedor de dados: 31
Autores: Ylkilic,   Rahmi.
A tragedy of the commons appears when the users of a common resource have incentives to exploit it more than the socially efficient level. We analyze the situation when the tragedy of the commons is embedded in a network of users and sources. Users play a game of extractions, where they decide how much resource to draw from each source they are connected to. We show that if the value of the resource to the users is linear, then each resource exhibits an isolated problem. There exists a unique equilibrium. But when the users have concave values, the network structure matters. The exploitation at each source depends on the centrality of the links connecting the source to the users. The equilibrium is unique and we provide a formula which expresses the...
Tipo: Working or Discussion Paper
Palavras-chave: Tragedy of the Commons; Networks; Nash Equilibrium; Efficiency; Centrality Measures; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C62; C72; D85; Q20.
Ano: 2008
URL: http://purl.umn.edu/6221

Modelling Pricing Behavior with Weak A‐Priori Information: Exploratory Approach
Provedor de dados: 31
Autores: Russo,   Carlo; Sabbatini,   Massimo.
In the absence of reliable a priori information, choosing the appropriate theoretical model to describe an industry’s behavior is a critical issue for empirical studies about market power. A wrong choice may result in model misspecification and the conclusions of the empirical analysis may be driven by the wrong assumption about the behavioral model. This paper develops a methodology aimed to reduce the risk of misspecification bias. The approach is based on the sequential application of a sliced inverse regression (SIR) and a nonparametric Nadaraya‐Watson regression (NW). The SIR‐NW algorithm identifies the factors affecting pricing behavior in an industry and provides a nonparametric characterization of the function linking these variables to price. This...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100478

DYNAMIC ANALYSIS WITH TIME SERIES MODELS: SIMULATION AND EMPIRICAL EVIDENCE
Provedor de dados: 31
Autores: Robledo,   Carlos W.; Zapata,   Hector O.
The performance of the FPE, AIC, HQ and SC criteria in choosing lag-length, and the effect on the impulse-response functions, are studied in a Monte Carlo simulation.  The experiments include stationary, cointegrated, and mixed unit root VAR and MA cases.
Tipo: Conference Paper or Presentation
Palavras-chave: Statistical selection criteria; Cointegration; Mixed unit roots; Impulse response functions; Small sample properties; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21526

A dynamic model of oligopoly in the coffee export market
Provedor de dados: 31
Autores: Karp,   Larry S.; Perloff,   Jeffrey M.
A linear-quadratic, dynamic feedback oligopoly model that nests various market structures is used to estimate the degree of competitiveness and the adjustment paths of the two largest coffee exporters, Brazil and Colombia. Their estimated behavior is relatively competitive. This subgame perfect dynamic model is-compared to a standard static oligopoly model and the open-loop model (the dynamic generalization of the standard static model). Both classical and Bayesian tests of open-loop and feedback dynamic models are reported.
Tipo: Working or Discussion Paper
Palavras-chave: Coffee; Dynamic oligopoly; Econometric; Subgame perfect Nash; Industrial Organization; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/6093

Estimating variance components in Stata
Provedor de dados: 31
Autores: Marchenko,   Yulia V.
This article gives a brief overview of the popular methods for estimating variance components in linear models and describes several ways to obtain such estimates in Stata for various experimental designs. The article’s emphasis is on using xtmixed to estimate variance components. Prior to Stata 9, loneway could be used to estimate variance components for one-way random-effects models. For other experimental designs, variance components could be computed manually using saved results after anova. The latter approach is viable but requires tedious computations for complicated experimental designs. Instead, as of Stata 9, variance components are easily obtained by using xtmixed.
Tipo: Journal Article
Palavras-chave: Variance components; Experimental design; ANOVA; REML; ML; Multilevel; Random coefficients; Mixed models; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117553

BEYOND THE MODEL SPECIFICATION PROBLEM: MODEL AND PARAMETER AVERAGING USING BAYESIAN TECHNIQUES
Provedor de dados: 31
Autores: Bryant,   Henry L.; Davis,   George C.
The model specification problem is perhaps the Achilles heel of applied econometrics. Rather than test down to a single model as is usually done, we estimate 72 different demand systems and use Bayesian averaging procedures over all 72 systems to generate meta estimates of the parameters (e.g., elasticities) of interest.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/20689

Hyperbolic discounting in analyzing investment in groundwater irrigation in India
Provedor de dados: 31
Autores: Chandrakanth,   Mysore G.; Rashmi,   N.; Chandrashekar,   H.; Nagaraj,   N.
Researchers are often confronted with the choice of discount rate as well as the method of discounting for estimating the amortized cost of long-term investment in agriculture including groundwater irrigation. The obvious choice is to use the opportunity cost of capital, which is the prevailing interest rate of around 9 percent (compounded – exponential basis), charged on longterm agriculture loans. However, using the ‘exponential’ basis does not provide a realistic amortized cost of irrigation as it over estimates the value of investment due to ‘exponential’ basis as demonstrated above. In order to obtain an empirical estimate of this interest rate, using field data from farmers three dry agro-climatic zones of Karnataka (Shamsundar (1996), Sripadmini...
Tipo: Working or Discussion Paper
Palavras-chave: Hyperbolic discounting; Groundwater; Exponential; Environmental Economics and Policy; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; D9; Q25; M4.
Ano: 2006
URL: http://purl.umn.edu/43626

Efficiency of selected risk management instruments. An empirical analysis of risk reduction in Kazakhstani crop production
Provedor de dados: 31
Autores: Heidelbach,   Olaf.
Kazakhstan’s agricultural sector plays an important role in the country's economy. Not only does it function as an economic output producer, it also serves as a social buffer in times of transition to a market economy. The restructuring process had a strong impact on the economic performance of agricultural enterprises. As the state no longer functions as a back-up financier in times of economic downturn, farmers have to find their own sustainable instruments to manage business risks, which are significant in Kazakhstan due to the acute continental climate and the resulting revenue fluctuations. This thesis is an integral part of the research project "Crop Insurance in Kazakhstan – Options for Building a Sound, Institution Promoting Agricultural...
Tipo: Thesis or Dissertation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Industrial Organization; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/92323

From the help desk: Bootstrapped standard errors
Provedor de dados: 31
Autores: Guan,   Weihua.
Bootstrapping is a nonparametric approach for evaluating the distribution of a statistic based on random resampling. This article illustrates the bootstrap as an alternative method for estimating the standard errors when the theoretical calculation is complicated or not available in the current software.
Tipo: Journal Article
Palavras-chave: Bootstrap; Cluster; Nl; Instrumental variables; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116034

A MULTIPLE ORGANIC POLLUTANT SIMULATION/OPTIMIZATION MODEL OF INDUSTRIAL AND MUNICIPAL WASTEWATER LOADING TO A RIVERINE ENVIRONMENT
Provedor de dados: 31
Autores: Carmichael,   Jeffrey J.
A multiple organic pollutant simulation/optimization model is developed to aid policy analysis of least cost approaches to wastewater management.  Downstream impacts vary non-linearly with pollution loads due to non-linear constituent interactions.  An iterative solution method is necessary.  The model is demonstrated using a case study of the Nitra River Basin in Slovakia.
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20995

MARKET AND POLICY ISSUES IN MICRO-ECONOMETRIC DEMAND MODELING
Provedor de dados: 31
Autores: Moro,   Daniele.
Micro-econometric demand modelling has been receiving an increasing attention in empirical research, mainly due to the increasing availability of micro-data. In this paper we provide a review of some relevant market and policy issues that can be analysed with the use of micro-data on demand. Problems arising from the treatment of micro-data are revised, mainly with reference to the standard neo-classical framework, although other approaches are also sketched. Finally, building on previous research, a dynamic model accounting for health issues, mainly obesity, is proposed for future research.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Health Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6500

Speaking Stata: Problems with lists
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Various problems in working through lists are discussed in view of changes in Stata 8. for is now undocumented, which provokes a detailed examination of ways of processing lists in parallel with foreach, forvalues, and other devices, including new, concise ways of incrementing and decrementing macros and evaluating other expressions to do with macros in place. New features for manipulating lists held in macros and the new levels command are also reviewed.
Tipo: Journal Article
Palavras-chave: Lists; For; Foreach; Forvalues; Levels; Macros; Tokenize; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116073

Die Berücksichtigung von Unsicherheit und Flexibilität in der Investitionsplanung – dargestellt am Beispiel einer Vertragsinvestition für Roggen
Provedor de dados: 31
Autores: Musshoff,   Oliver; Hirschauer,   Norbert.
Investment decisions are, as a rule, characterized by uncertainty, irreversibility and flexibility. Simple net present value calculations will not account for these features. In many situations even flexible investment planning with decision trees, which represents the most advanced method of traditional investment appraisal, does not have the capacity to solve practical decision problems adequately. One handicap is a realistic and manageable representation of stochastic variables. It has long been known that stochastic simulation procedures offer a nearly unlimited capacity to represent distributions and stochastic processes. However, a standard simulation will not allow for the consideration of flexibility. The problem is that with a simple forward...
Tipo: Journal Article
Palavras-chave: Investment; Uncertainty; Flexibility; Stochastic simulation; Dynamic programming; Sales contracts with fixed prices; Farm Management; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2004
URL: http://purl.umn.edu/97437

Media Analysis on Volatile Markets’ Dynamics and Adaptive Behavior for the Agri-Food System
Provedor de dados: 31
Autores: von Davier,   Zazie; Heyder,   Matthias; Theuvsen,   Ludwig.
The volatility of agricultural markets has increased remarkably in recent years. In spite of this, the way in which supply chain actors perceive market volatility has only rarely been analyzed. This paper seeks to close this research gap by presenting empirical findings about how the volatility of agricultural markets is perceived, how increasing market volatilities are being explained, and what adaptations to the volatile external environments are being suggested. Based on a large-scale media analysis, we have identified perceptions, which vary greatly over time, especially with regard to the perception of the threats and opportunities volatility creates for farms and firms and the most frequently identified reasons for volatile prices
Tipo: Journal Article
Palavras-chave: Agriculture; Media analysis; Public discourse; Shared assumptions; Volatility; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/97024

An Application of Target-MOTAD Programming to the Analysis of Downside Business and Financial Risk on Farms
Provedor de dados: 31
Autores: Parton,   Kevin A.; Cumming,   Robert J.
In this paper a description is provided of the development and use of a target-MOTAD model for use in consultative work with farmers who are under financial pressure. The analysis of downside risk and introduction of a trade-off between financial and business risks are key features of this model that make it especially applicable to such situations.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1990
URL: http://purl.umn.edu/12286

POLICY IMPACT ON PRODUCTION STRUCTURE AND INCOME RISK ON POLISH DAIRY FARMS
Provedor de dados: 31
Autores: Was,   Adam; Malak-Rawlikowska,   Agata.
Likely policy changes leading towards further liberalisation of the Common Agricultural Policy would certainly influence farmers’ income and revenue risks. Thus, a question arises both for farmers and for policy makers about possible effects and necessary adjustments that should be made to face such changes. The paper examines long-term impacts of changes of key policy factors on income risk in Polish dairy farms. Deterministic linear programming farm model was used to estimate farm incomes and likely changes in production pattern, while stochastic simulation farm model was applied for examining income risk. The main results of this model chain are optimal production structures for farm types modelled in a set of assumed policy conditions as well as farm...
Tipo: Conference Paper or Presentation
Palavras-chave: Milk quota; Direct payment; Income risk; Farm model; Policy changes; Agricultural and Food Policy; Consumer/Household Economics; Research Methods/ Statistical Methods; Q10; Q18.
Ano: 2008
URL: http://purl.umn.edu/44842

Stata tip 75: Setting up Stata for a presentation
Provedor de dados: 31
Autores: Crow,   Kevin.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122713

A NUMERICAL EXAMPLE OF THE PRACTICAL USE OF DUMMY VARIABLES
Provedor de dados: 31
Autores: Sappington,   Charles B.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1970
URL: http://purl.umn.edu/29874

Fishing for Understanding: A Mixed Logit Model of Freshwater Angler Preferences
Provedor de dados: 31
Autores: Beville,   Stephen; Kerr,   Geoffrey N.
Freshwater fisheries management requires knowledge of not only the resource but angler preferences and the extent to which preferences vary. This paper reports results from an internet-based stated preference survey of anglers in the North Canterbury region. Discrete choice models are used to investigate how the quality of fishery attributes impact anglers’ selection of fishing sites. The models reveal significant preference heterogeneity between anglers for particular fishing site attributes. Furthermore, anglers’ preference intensities for identical attributes vary between sites. Consequently, efficient allocation of resources entails spatial and social components.
Tipo: Conference Paper or Presentation
Palavras-chave: Discrete choice analysis; Latent class; Mixed logit; Angler heterogeneity; New Zealand recreational trout fisheries; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/96446

BEHAVIOR AND PRODUCTIVITY IMPLICATIONS OF INSTITUTIONAL AND PROJECT FUNDING OF RESEARCH
Provedor de dados: 31
Autores: Bredahl,   Maury E.; Bryant,   W. Keith; Ruttan,   Vernon W.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1979
URL: http://purl.umn.edu/14058

EMPIRICAL TESTS OF HYPOTHETICAL BIAS IN CONSUMERS' SURPLUS SURVEYS
Provedor de dados: 31
Autores: Sinden,   Jack A.
Questionnaire surveys are an established economic research method for eliciting consumers' surplus values. However, the necessarily hypothetical nature of surveys may not promote truthful responses. In 17 empirical tests, actual money donations were elicited and compared to hypothetical donations elicited previously. In all 17, there was no statistical difference between the actual and hypothetical willingness to pay. Hypothetical bias was therefore absent in all these tests.
Tipo: Journal Article
Palavras-chave: Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/22956

Friction and the Multiplicity of Equilibria
Provedor de dados: 31
Autores: Karp,   Larry S.; Paul,   Thierry.
In familiar models, a decrease in the friction facing mobile factors (e.g., lowering their adjustment costs) increases a coordination problem, leading to more circumstances where there are multiple equilibria. We show that a decrease in friction can decrease coordination problems if, for example, a production externality arises from a changing stock of knowledge or a changing environmental stock. In general, the relation between the amount of friction that mobile factors face and the likelihood of multiple equilibria is non-monotonic.
Tipo: Working or Discussion Paper
Palavras-chave: Indeterminacy; Multiple equilibria; Coordination games; Factor reallocation; Environmental externality; Learning-by-doing; Costs of adjustment; Research Methods/ Statistical Methods; C61; J21; O13; R23.
Ano: 2005
URL: http://purl.umn.edu/25120

TRUNCATED REGRESSION IN EMPIRICAL ESTIMATION
Provedor de dados: 31
Autores: Marsh,   Thomas L.; Mittelhammer,   Ronald C.
In this paper we illustrate the use of alternative truncated regression estimators for the general linear model. These include variations of maximum likelihood, Bayesian, and maximum entropy estimators in which the error distributions are doubly truncated. To evaluate the performance of the estimators (e.g., efficiency) for a range of sample sizes, Monte Carlo sampling experiments are performed. We then apply each estimator to a factor demand equation for wheat-by-class.
Tipo: Conference Paper or Presentation
Palavras-chave: Doubly truncated samples; Bayesian regression; Maximum entropy; Wheat-by-class; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/36391

Combination of the Swiss agrarian sector model SILAS-dyn with the life cycle assessment tool SALCA
Provedor de dados: 31
Autores: Zimmermann,   Albert.
The agricultural sector model SILAS-dyn has been used by Agroscope ART for 10 years for the political advisory of the Swiss agricultural administration. To evaluate the environmental effects of different policy scenarios, a LCA module has been developed, connecting a hierarchical linkage to an existing LCA calculating tool. This lowers the formulation input and simplifies the adaptation of updated environmental models. The results of four scenarios show, through the example of energy use as an environmental impact, that indirect effects, such as energy use in the context of imported concentrates, can influence conclusions significantly. The scenario suggesting an increase of fertiliser prices does not change the results significantly, whereas higher energy...
Tipo: Conference Paper or Presentation
Palavras-chave: Sector model; LP; Political advisory; LCA; Income; Agricultural and Food Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6603

Super Efficiency Evaluations Based on Potential Slack
Provedor de dados: 31
Autores: Bogetoft,   Peter; Hougaard,   Jens Leth.
Super efficiency evaluations are introduced along the lines of the potential improvements approach in Bogetoft and Hougaard (1999).  Both a reference selection and a related super efficiency index is defined.  The new (potential slack) super efficiency index is compared to a Farrell-based super efficiency index (as in Andersen and Petersen 1993) with respect to convex envelopment technologies.
Tipo: Working or Discussion Paper
Palavras-chave: Super efficiency; Potential slack; Reference selection; Efficiency index; DEA; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/24194

Commodity Price Volatility and Nutrition Vulnerability
Provedor de dados: 31
Autores: Verma,   Monika; Hertel,   Thomas W.
In this paper we examine the impact of commodity price volatility on nutritional attainment of households at the nutritional poverty line in Bangladesh. We focus on the first two moments of the distribution of nutrition and consider the differential impacts across socio-economic groups within the country. We also examine the direction and magnitude of the shift in these moments as a result of implementation of special safeguards measures aimed at preventing import surges.
Tipo: Conference Paper or Presentation
Palavras-chave: Price volatility; Calories; Vulnerability; Food consumption; Poverty; Household data; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49344

A Hedonic Price Analysis for the New Zealand Wine Industry: Preliminary Results
Provedor de dados: 31
Autores: Bicknell,   Kathryn; Friesen,   Lana; MacDonald,   Ian.
This paper presents preliminary results from a hedonic price analysis of premium wines in New Zealand over the vintages 1994 – 2003. Implicit prices are presented for a sensory quality rating, as well as wine variety and regional reputation. Results show that the price premium associated with Michael Cooper's five-star quality rating is highly significant and increasing in magnitude over the study period. Trends in regional and varietal preferences are also explored.
Tipo: Conference Paper or Presentation
Palavras-chave: Hedonic pricing; New Zealand wine; Quality; Agribusiness; Agricultural and Food Policy; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98502

Smallholder marketed surplus and input use under transactions costs: maize supply and fertilizer demand in Kenya
Provedor de dados: 31
Autores: Arega,   D.A.; Manyong,   Victor M.; Omanya,   G.; Mignouna,   H.D.; Bokanga,   M.; Odhiambo,   George D.
This paper assessed the effects of transactions costs—relative to price and non-price factors—on smallholder marketed surplus and input use in Kenya. A selectivity model was used that accounts not only for the effects of fixed and variable transactions costs but also for the role of assets, technology, and support services in promoting input use and generating a marketable surplus. Output supply and input demand responses to changes in transactions costs and price and non-price factors were estimated and decomposed into market entry and intensity. The results showed that while transactions costs indeed have significant negative effects on market participation, cost-mitigating innovations—such as group marketing—are also emerging to mitigate the costs of...
Tipo: Conference Paper or Presentation
Palavras-chave: Commercialization; Marketed surplus; Fertilizer use; Transactions cost; Kenya; Agricultural and Food Policy; Agricultural Finance; Consumer/Household Economics; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/52074

Comparison of Land Use Area Estimates from Three Different Data Sources for the Upper Mississippi River Basin
Provedor de dados: 31
Autores: Chinnisamy,   Santhi; Gassman,   Philip W.; Secchi,   Silvia; Srinivasan,   Raghavan.
This study presents the results of comparing land use estimates between three different data sets for the Upper Mississippi River Basin (UMRB). The comparisons were performed between the U.S. Department of Agriculture (USDA) Natural Resource Conservation Service (NRCS) National Resource Inventory (NRI), the U.S. Geological Survey (USGS) National Land Cover Data (NLCD) database, and a combined USDA National Agricultural Statistics Service (NASS) Agricultural Census – NLCD dataset created to support applications of the Hydrologic Unit Model for the U.S. (HUMUS). The comparison was performed for 1992 versions of the datasets because that was the only consistent year available among all three data sources. The results show that differences in land use area...
Tipo: Report
Palavras-chave: Agricultural land; Cropland; HUMUS; Land use area estimates; NLCD; Non-agricultural land; NRI; UMRB; Water quality modeling.; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6332

FORECASTING LIMITED DEPENDENT VARIABLES:  BETTER STATISTICS FOR BETTER STEAKS
Provedor de dados: 31
Autores: Lusk,   Jayson L.; Norwood,   F. Bailey; Brorsen,   B. Wade.
Little research has been conducted on evaluating out-of-sample forecasts of limited dependent variables.  This study describes the large and small sample properties of two forecast evaluation techniques for limited dependent variables: receiver-operator curves and out-of-sample-log-likelihood functions.  The methods are shown to provide identical model rankings in large samples and similar rankings in small samples.  The likelihood function method is slightly better at detecting forecast accuracy in small samples, while receiver-operator curves are better at comparing forecasts across different data.  By improving forecasts of fed-cattle quality grades, the forecast evaluation methods are shown to increase cattle marketing revenues by $2.59/head.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/34612

NOTES ON THE USE OF SUBSECTOR ANALYSIS AS A DIAGNOSTIC TOOL FOR LINKING INDUSTRY AND AGRICULTURE
Provedor de dados: 31
Autores: Staatz,   John M.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/11803

Extreme coefficients in Geographically Weighted Regression and their effects on mapping
Provedor de dados: 31
Autores: Cho,   Seong-Hoon; Lambert,   Dayton M.; Kim,   Seung Gyu; Jung,   Suhyun.
This study deals with the issue of extreme coefficients in geographically weighted regression (GWR) and their effects on mapping coefficients using three datasets with different spatial resolutions. We found that although GWR yields extreme coefficients regardless of the resolution of the dataset or types of kernel function, 1) the GWR tends to generate extreme coefficients for less spatially dense datasets, 2) coefficient maps based on polygon data representing aggregated areal units are more sensitive to extreme coefficients, and 3) coefficient maps using bandwidths generated by a fixed calibration procedure are more vulnerable to the extreme coefficients than adaptive calibration.
Tipo: Conference Paper or Presentation
Palavras-chave: Extreme coefficient; Fixed and adaptive calibrations; Geographically weighted regression; Mapping; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49117

Who cares about food origin?  A comparison of hypothetical survey responses and actual shopping behavior
Provedor de dados: 31
Autores: Grebitus,   Carola; Colson,   Gregory; Menapace,   Luisa; Bruhn,   Maike.
This paper explores the relevance of food origin to consumers when making product purchase decisions.  We use data from a survey of pork shoppers at the point of sale of five food retailers in Germany. Participants engaged in both a hypothetical survey eliciting evaluations of the importance of different pork attributes and a series of questions related to their knowledge about the attributes of their actual purchase of pork. This enables us to compare hypothetical responses with actual purchase behavior.  The results show that origin indeed is a relevant attribute to a subset of consumers. A share of consumers does pay attention to origin labels and is willing to undertake costly search for origin information. Furthermore, the data give evidence that...
Tipo: Conference Paper or Presentation
Palavras-chave: Hypothetical survey responses; Actual shopping behavior; Pork; Origin labeling; Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61344

DC Optimal Power Flow Formulation and Solution Using QuadProgJ
Provedor de dados: 31
Autores: Sun,   Junjie; Tesfatsion,   Leigh.
Replaced with revised version of paper 06/21/06.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/18221

EVALUATING THE LEVEL AND DISTRIBUTION OF BENEFITS FROM DAIRY INDUSTRY RESEARCH
Provedor de dados: 31
Autores: Freebairn,   John W.
A model and associated formulae are developed to estimate the size and distribution of benefits generated by different types of research for the Australian dairy industry. Particular attention is given to the influence of policy interventions on the estimates. The estimates of aggregate research benefits differ for free market assumptions versus current policy assumptions, but quantitatively the differences are small. By contrast, estimates of the distribution of benefits between different groups of consumers and farmers are significantly altered by the policy interventions.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/22507

Numerical Analysis of Non-Constant Discounting with an Application to Renewable Resource Management
Provedor de dados: 31
Autores: Fujii,   Tomoki; Karp,   Larry S.
The possibility of non-constant discounting is important in environmental and resource management problems where current decisions affect welfare in the far-distant future, as with climate change. The difficulty of analyzing models with non-constant discounting limits their application. We describe and provide software to implement an algorithm to numerically obtain a Markov Perfect Equilibrium for an optimal control problem with non-constant discounting. The software is available online. We illustrate the approach by studying welfare and observational equivalence for a particular renewable resource management problem.
Tipo: Working or Discussion Paper
Palavras-chave: Non-constant discounting; Numerical methods; Non-renewable resources; Observational equivalence; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C63; Q20.
Ano: 2006
URL: http://purl.umn.edu/7199

A Mixed Geographically Weighted Approach to Decoupling and Rural Development in the EU-15
Provedor de dados: 31
Autores: Pecci,   Francesco; Sassi,   Maria.
The CAP reform and the recent EC communication aimed at preparing its Health Check emphasise the need for interventions locally based where agricultural policy integrates with a broader policy for rural areas growth. In this context, the paper investigates the possible different sets policy indicators affecting agricultural productivity at the regional level considering spatial heterogeneity by means of a Mixed Geographically Weighted Regression approach. The analysis is based on a set of policy sensitive indicators selected according to the key component of the CAP reform and referred to a sample of 164 EU-15 regions at NUTS2 level. The methodology adopted, new for the empirical literature on the topic, allows for a more accurate understanding of spatial...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP reform; Agricultural productivity; Spatial analysis; Cluster analysis; Agricultural and Food Policy; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6625

MODEL TREE: AN APPLICATION IN REAL ESTATE APPRAISAL
Provedor de dados: 31
Autores: Acciani,   Claudio; Fucilli,   Vincenzo; Sardaro,   Ruggiero.
In the last twenty years in real estate appraisal there has been a growing interest for new and reliable assessment techniques essentially through the introduction of pluriparametric estimate, in particular of linear regression. However, also these techniques seem having not a great deal of adherence to very complex markets, for which the detection of best suited techniques to investigate market segments is necessary. The aim of the research is to test the applicative possibilities of model tree to land market, in order to highlight possible market segments in the original data set not detectable a priori.
Tipo: Conference Paper or Presentation
Palavras-chave: Data mining; Model tree; Multiple regression analysis; Land market appraisal; Research Methods/ Statistical Methods; C01.
Ano: 2008
URL: http://purl.umn.edu/44853

Is Unlevered Firm Volatility Asymmetric?
Provedor de dados: 31
Autores: Daouk,   Hazem; Ng,   David T.C.
Asymmetric volatility refers to the stylized fact that stock volatility is negatively correlated to stock returns. Traditionally, this phenomenon has been explained by the financial leverage effect. This explanation has recently been challenged in favor of a risk premium based explanation. We develop a new, unlevering approach to document how well financial leverage, rather than size, beta, book-to-market, or operating leverage, explains volatility asymmetry on a firm-by-firm basis. Our results reveal that, at the firm level, financial leverage explains much of the volatility asymmetry. This result is robust to different unlevering methodologies, samples, and measurement intervals. However, we find that financial leverage does not explain index-level...
Tipo: Working or Discussion Paper
Palavras-chave: Volatility asymmetry; Financial leverage; Financial Economics; Research Methods/ Statistical Methods; G12.
Ano: 2009
URL: http://purl.umn.edu/51182

CAPITAL BUDGETING, INTERTEMPORAL PROGRAMMING MODELS, WITH PARTICULAR REFERENCE TO AGRICULTURE
Provedor de dados: 31
Autores: Rae,   Allan N.
Investment decision processes typically involve the selection of projects, the timing of their initiation and the determination of the amount to be invested in each time period. A linear programming model considered appropriate for solving such models is described, in which the multi-dimensional criterion function is expressed as a linear combination of the appropriately-weighted objectives. An empirical application is then discussed, the objectives of the firm being the maximization of tax-free cash and assets on hand at the end of the planning period. Finally, the appropriate length of the planning horizon, and some approaches to capital budgeting under non-certainty, are discussed.
Tipo: Journal Article
Palavras-chave: Agricultural Finance; Research Methods/ Statistical Methods.
Ano: 1970
URL: http://purl.umn.edu/22812

Integration of Agricultural Information Resources in Western China
Provedor de dados: 31
Autores: Zhou,   Lei; Wen,   Shuping.
The essence and significance of integrating agricultural information resources in western China were summarized. The integration methods were introduced from the following four aspects: agricultural information infrastructure, database, collaborative management and service application. The integration technologies were discussed, the core of which lies in integrating distributed application via software and realizing the trans-departmental and trans-system exchange and share of information through controlling information. Based on the introduction of several frequently-used intelligence terminals, the approaches of realizing the transmission of agricultural information resources in western China were analyzed. And the integration measures were put forward...
Tipo: Thesis or Dissertation
Palavras-chave: Western China; Agricultural information resources; Integration; China; Community/Rural/Urban Development; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/54033

Statistical software certification
Provedor de dados: 31
Autores: Gould,   William.
In the first part (sections 1 and 2), this article describes the automated process that is used to certify Stata prior to shipment of new releases or updates. The second part (section 3) describes how these techniques can be adopted to your own work.
Tipo: Journal Article
Palavras-chave: Certification scripts; Ado-files; Cscript; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115933

Model Selection in Stochastic Frontier Analysis: Maize Production in Kenya
Provedor de dados: 31
Autores: Liu,   Yanyan.
We demonstrate how a recently developed model selection procedure can be used to choose among competing stochastic frontier models where inefficiency depends on firm characteristics. We provide evidence on the power of this procedure. Moreover, we examine the effects of model choice on estimation results. We find that different models can lead to rather different magnitudes of the partial effects of the exogenous factors. However, because the model selection procedure gives an unambiguous choice of best model, and because bootstrapping indicates that the procedure is reliable, we conclude that it does not matter whether other models give different results.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21281

Stata tip 66: ds—A hidden gem
Provedor de dados: 31
Autores: Weiss,   Martin.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122607

NONMARKET VALUATION UNDER PREFERENCE UNCERTAINTY: ECONOMETRIC MODELS AND ESTIMATION
Provedor de dados: 31
Autores: Hanemann,   W. Michael; Kristrom,   Bengt; Li,   Chuan-Zhong.
This paper makes an attempt to introduce preference uncertainty into discrete choice models used in contingent valuation experiments. We develop an econometric model which may characterize the degree of the uncertainty and provide an empirical illustration of the suggested model.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1996
URL: http://purl.umn.edu/6858

Stata tip 54: Post your results
Provedor de dados: 31
Autores: Van Kerm,   Philippe.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119298

Examination of the value system and food preferences in the institutional catering market in light of primary research carried out in Békés county
Provedor de dados: 31
Autores: Fodor,   Monika.
In my present paper I try to characterise the differences present at the level of food preferences by means of examining the value system as, in my opinion, differences in the value system are reflected in concrete product choices and thus also in food selection. By using factor and cluster analysis I have proven that consumer groups formed alongside the value system also differ regarding food consumption viewpoints. Furthermore, in my paper I also aim to characterise food preference as a determining factor of modes of daily eating. Based on the results, I have concluded that the impact of time-related preferences on food selection can be felt in consumers’ opinions, but cannot be regarded as dominant. In the system of food selection viewpoints, internal...
Tipo: Journal Article
Palavras-chave: Food consumption preferences; Value system; Factor analysis; Cluster analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/48095

Delimiting the Household Unit and Defining Agricultural Households - Issues Faced in the Methodology of Eurostat's Income of Agricultural Households Sector (IAHS) Statistics
Provedor de dados: 31
Autores: Hill,   Berkeley; Cook,   Edward.
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/15714

DYNAMICS AND UNCERTAINTY IN ENVIRONMENTAL AND NATURAL RESOURCE MANAGEMENT UNDER SCARCITY: THE CASE OF IRRIGATION
Provedor de dados: 31
Autores: Bontemps,   Christophe; Couture,   Stephane.
The objective of this paper is to study the problem of management of irrigation water. We analyse farmers' economic rules of tactical irrigation scheduling in a certain or uncertain environment under water scarcity. The optimal plans depend on uncertain weather conditions and expectations.  We develop a dynamic economic model of irrigation water applications under certain or uncertain weather conditions and in the context of a limited total quantity of water. We program this economic model, introducing the agronomic model EPIC, which is used to obtain information on the crop yield. The model is used to explain the optimal irrigation management plan of corn in the area of Toulouse (France). This model improves water management and leads to substantial...
Tipo: Conference Paper or Presentation
Palavras-chave: Dynamic optimization; Irrigation management; Agroeconomic modeling; Uncertainty; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 1999
URL: http://purl.umn.edu/21504

A Robust Study of Regression Methods for Crop Yield Data
Provedor de dados: 31
Autores: Zhu,   Ying; Ghosh,   Sujit K.
The objective of this study is to evaluate the robust regression method when detrending the crop yield data. Using a Monte Carlo simulation method, the performance of the proposed Time-Varying Beta method is compared with the previous study of OLS, M-estimator and MM-estimator in an application of crop yield modeling. We analyze the properties of these estimators for outlier-contaminated data in both symmetric and skewed distribution case. The application of these estimation methods is illustrated in an agricultural insurance analysis. The consequence of obtaining more accurate detrending method will offer the potential to improve the accuracy of models used in rating crop insurance contracts.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/103426

PRESENCE OF STOCHASTIC ERRORS IN THE INPUT DEMANDS: ARE DUAL AND PRIMAL ESTIMATIONS EQUIVALENT?
Provedor de dados: 31
Autores: Bittencourt,   Maurício Vaz Lobo.
This study verifies the primal and dual approaches in presence of stochastic errors in output and input demands, and policy implications when such errors are not taken into account. A data set based on a representative agent behavior is created through Monte Carlo simulation and used to estimate econometrically the primal and dual functions associated to the technology chosen. Results show that both formulations are unbiased, consistent, and efficient. No consideration of these errors can lead to wrong policy recommendations in a productive sector. Any kind of policy created to improve the total production of a particular sector has to consider the issues so far discussed to avoid such bias problems and inefficiency before be applied to the real world.
Tipo: Conference Paper or Presentation
Palavras-chave: Stochastic errors; Input demands; Dual; Primal; Policy implication; Monte Carlo simulation.; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22096

MONTE CARLO EVIDENCE ON COINTEGRATION AND CAUSATION
Provedor de dados: 31
Autores: Zapata,   Hector O.; Rambaldi,   Alicia N.
The small sample performance of Granger causality tests under different model dimensions, degree of cointegration, direction of causality, and system stability are presented.  Two tests based on maximum likelihood estimation of error-correction models (LR and WALD) are compared to a Wald test based on multivariate least squares estimation of a modified VAR (MWALD).  In large samples all test statistics perform well in terms of size and power.  For smaller samples, the LR and WALD tests perform better than the MWALD test. Overall, the LR test outperforms the other two in terms of size and power in small samples.
Tipo: Working or Discussion Paper
Palavras-chave: Causality tests; Cointegration; Likelihood ratio; Wald statistic; Monte Carlo Experiments; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/31690

A GENERALISED MAXIMIN APPROACH TO IMPRECISE OBJECTIVE FUNCTION COEFFICIENTS IN LINEAR PROGRAMS
Provedor de dados: 31
Autores: Drynan,   Ross G.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/22522

Does the environment in which ICT-based market information services (MIS) projects operate affect their performance? Experiences from Kenya
Provedor de dados: 31
Autores: Okello,   Julius Juma; Ndirangu,   Lydia K.
The need to provide agricultural information to farmers has led to emergence of numerous ICTbased MIS projects in developing country. These projects aim at promoting commercialization of smallholder agriculture and subsequently their welfare. This study examines the how the environment in which such ICT-based MIS affect their performance. It specifically uses the DrumNet project, an ICT-based MIS, to assess how the socio-economic, physical, political and physical environment in the project areas affected its performance. The study finds that those transaction-related problems, especially strategic default, deriving from these environmental factors greatly undermined the performance of DrumNet forcing it to relocate severally. It discusses policy...
Tipo: Journal Article
Palavras-chave: ICT-based MIS projects; The DrumNet model; Operational environment; Performance; Kenya; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/96193

THRESHOLD MODELS IN THEORY AND PRACTICE
Provedor de dados: 31
Autores: Zapata,   Hector O.; Gauthier,   Wayne M.
Threshold models have gained much recent attention in applied economics for modeling nonlinear behavior. The appeal for these models is due in part to the observable pattern that many economic variables follow, such as asymmetric adjustment towards equilibrium. This paper reviews the literature and provides links to software programs.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35147

APPLYING A METHOD OF PAIRED COMPARISONS TO MEASURE ECONOMIC VALUES FOR MULTIPLE GOODS SETS
Provedor de dados: 31
Autores: Rosenberger,   Randall S.; Peterson,   George L.; Loomis,   John B.
A method of paired comparison is adapted for use in estimating economic measures of value.  The method elicits multiple binary choices for paired items in a choice set.  Probability distributions and economic values are estimated nonparametrically and parametrically.  The method is applied in an experimental context with a choice set composed of four private goods and several sums of money.  The sample's median value estimtes for the goods are generally not different than the market prices for these goods.  People who are in the market for a good value it higher than those not in the market for the good.
Tipo: Journal Article
Palavras-chave: Alternative gains; Economic valuation; Hypothetical market; Paired comparisons; Stated choice method; Research Methods/ Statistical Methods; C51; C80; D12; Q26.
Ano: 2002
URL: http://purl.umn.edu/15516

MODELING SPATIAL ACCESSIBILITY WITHIN DISCRETE CHOICE FRAMEWORK
Provedor de dados: 31
Autores: Ulimwengu,   John M.; Guo,   Xiaoqi.
Spatial accessibility is concerned with the opportunity that an individual at a given location possesses to participate in a particular activity or set of activities. The main objective of this paper is to highlight the shortcomings of traditional accessibility measures and provide some appropriate methodological suggestions for their improvement. Traditional measures derived from cumulative opportunities and gravity models focus on physical proximity leaving out individual and spatial attributes as potential explanatory variable. The improvement through random utility theory relies mainly on Multinomial logit models under Independently and Identically Distributed (IID) and individual response homogeneity assumptions that often do not hold in case of...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20170

PRODUCTION PLANNING DEVELOPMENT AND PARADIGMS INTEGRATION
Provedor de dados: 31
Autores: Shmakov,   Vladimir; Salganik,   Viktor; Pesin,   Alexander; Jludov,   Viktor; Ledneva,   Galina.
The paper reviews principles of different concepts of enterprise management including a theory of constrains, a Balanced Scorecard, lean production, Six Sigma.  The authors believe that creating some mix or integration of these paradigms can bring extraordinary effect for production management. As example the modified Balanced Scorecard based on constraints and its application on Magnitorsk metallurgical enterprise in Russia is described.
Tipo: Journal Article
Palavras-chave: Theory of constrains; Balanced Scorecard; Limiting factors; Planning of production program.; Production Economics; Research Methods/ Statistical Methods; M11; M21.
Ano: 2009
URL: http://purl.umn.edu/94594

South Korean Millers’ Preferences for the Quality Characteristics of Hard White Wheat that is Used in Producing All-purpose Flour
Provedor de dados: 31
Autores: Park,   Jaehong; Henneberry,   Shida Rastegari.
Using the choice-based conjoint analysis and self explicated approach, I elicited South Korean millers’ preference and willingness to pay for the quality characteristics of hard white wheat that is used in producing all-purpose flour. In specified seven attributes, test weight, moisture, and price significantly affect to South Korean millers’ utility but protein contents, ash, dockage, and falling number does not. South Korean millers are more willing to pay to change the quality characteristics related to the milling yields and profitability, such as test weight, moisture and dockage. But their willingness-to-pay for protein content is not as big as common expectation. Along with the research of Srinivasan (1997), we found that the self-explicated...
Tipo: Conference Paper or Presentation
Palavras-chave: Hard White Wheat; South Korean wheat market; Choice-based conjoint analysis; Self-explicated approach; Conditional logit model; Willingness-to-pay; Agribusiness; Agricultural and Food Policy; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; International Relations/Trade; Marketing; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/56327

How Can Impact Assessment Take Into Account Wider Social and Economic Impacts?
Provedor de dados: 31
Autores: McGregor,   J. Allister; Mosley,   Paul; Johnson,   Susan; Simanowitz,   Anton.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/23747

Relationship Quality and Innovation Capacity of Chains: The Case of the Traditional Food Sector in the EU
Provedor de dados: 31
Autores: Gellynck,   Xavier; Kuhne,   Bianka; Weaver,   Robert D.
The purpose of the paper is to explore how the perceived relationship quality is related to the innovation capacity in chains of the traditional food sector. Based on suggestions from theory and previous studies, empirical evidence is drawn from a survey of 90 traditional food chains including 270 companies from 3 European countries in 6 traditional food product categories. Heterogeneity across these chains is first examined based on cluster analysis that identifies three distinct clusters interpreted as reflecting three levels of intensity in innovation capacity: high, medium, and low. Next, we define measures of the chain relationship quality through characteristics such as trust, conflict and reputation. The quality of the chain relationship is then...
Tipo: Conference Paper or Presentation
Palavras-chave: Innovation capacity; Chain relationship quality; Traditional food products; SMEs; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100498

Stainability of Cultivated Land in Henan Province Based on Ecological Footprint
Provedor de dados: 31
Autores: Li,   Ying-chao.
This paper summarizes the regional situation of Henan Province of China, and introduces the principle of ecological footprint mode, as well as computing formulas of ecological footprint and ecological capacity. According to the related data of Henan Province from 1998 to 2007, this paper firstly calculates the per capita ecological footprint and per capita ecological capacity of Henan Province. Result indicates that cultivated land in Henan Province shows ecological surplus with sustainable land use. And ecological surplus has increased since the year 2003. Secondly, dynamic analysis of ecological footprint of arable land is carried out in Henan Province. Thirdly, this paper also studies on the per capita ecological demand and supply in 18 districts and...
Tipo: Thesis or Dissertation
Palavras-chave: Ecological footprint; Cultivated land; Sustainable utilization; China; Community/Rural/Urban Development; Environmental Economics and Policy; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53591

Identifying Threshold Effects and Typologies in Economic Growth: A Panel Approach
Provedor de dados: 31
Autores: Hong,   Yongmiao; Wang,   Dabin; Zhang,   Xiaobo.
In the paper, we use a panel data approach to study the threshold effects and nonlinearity in economic growth instead of the cross-sectional approach commonly used in previous studies. The methodologies developed by Hansen (2000) and Caner and Hansen (2004) are applied to identify threshold variables. The analysis reveals many threshold variables, in particular for short lengths of panels. However, the results vary according to the number of observations included. To reduce the large number of potential threshold variables, principle component analyses are used to create a smaller number of composite factors and test the threshold effects. Using a five-year panel, we show how to classify countries into different growth typologies. Finally, a local linear...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19163

Dairy Supply Response under Stochastic Trend and Seasonality: A Structural Time Series Analysis
Provedor de dados: 31
Autores: Paudel,   Laxmi; Houston,   Jack E.; Devkota,   Nirmala.
A structural time series methodology was used to examine the role of stochastic trend and seasonality in dairy supply response model.  In our analysis, the dairy supply model with stochastic seasonality and deterministic trend performs best in terms of diagnostic tests, goodness-of-fit measures, and forecasting accuracy.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/35531

Hedonic Housing Prices and Agricultural Pollution: An Empirical Investigation on Semiparametric Models
Provedor de dados: 31
Autores: Bontemps,   Christophe; Simioni,   Michel; Surry,   Yves R.
Many empirical studies challenged the parametric approach to estimate nonlinear house price models and to use instead nonparametric or semiparametric model specifications. In the area of environmental analysis using house price models,  Stock (1991) and McMillen and Thorsen (2000) applied semi-parametric models to estimate the impact of hazardous wastes on house prices. Furthermore, estimating nonparametricaly house price models is gaining now additional momentum because  Ekeland et al. (2002) provided a theoretical justification to use such an empirical approach to estimate hedonic price  models. The objective of this paper is to assess the impact of agricultural pollution in a livestock intensive region of France  using alternative non-parametric and...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19547

A COMMENT ON KLIEVE-MACAULAY'S SOUTHERN BLUEFIN TUNA GAME
Provedor de dados: 31
Autores: Simmons,   Phil; Wallace,   Lee.
Klieve and MacAulay (1993) (KM) analyse bargaining between the Australian and Japanese Southern Bluefin Tuna (SBT) industries using game theory. The KM model is a Nash equilibrium with symmetrical information, threat functions and a set of biological constraints. When we attempted to include the New Zealand SBT industry as a player in the KM model, we discovered important shortcomings in it. In this comment, we outline three major shortcomings in the KM model and propose an alternative model of a Nash equilibrium for the SBT industry.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/22675

Institutional arrangements for land drainage in developing countries
Provedor de dados: 31
Autores: Freisem,   Claudia; Scheumann,   Waltina.
Tipo: Working or Discussion Paper
Palavras-chave: Drainage; Infrastructure; Irrigable land; Farmer participation; Financing; Land reclamation; Flood control; Irrigated farming; Social aspects; Economic aspects; Environment; Case studies; Operations; Maintenance; Waterlogging; Salinity; Productivity; Food security; Institutional constraints; Communal irrigation systems; Water users' associations; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; Land Economics/Use; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2001
URL: http://purl.umn.edu/92776

Demand System Analysis of the South Korean Beef Market with the Free Trade Demand Model
Provedor de dados: 31
Autores: Lee,   Young-Jae; Kennedy,   P. Lynn.
In this study a demand system analysis for beef in South Korea is constructed. A free trade demand system was used in which the economic welfare of market participants are maximized. Recognizing implicit discrimination about non-locally sourced beef products, this study deduces market demand equations with respect to consumer preference in order to identify the marginal effect of change consumer preference has on market demand.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6825

RANGE AND NUMBER-OF-LEVELS EFFECTS IN DERIVED AND STATED MEASURES OF ATTRIBUTE IMPORTANCE
Provedor de dados: 31
Autores: Verlegh,   Peeter W.J.; Schifferstein,   Hendrik N.J.; Wittink,   Dick R.
We study how the range of variation and the number of attribute levels affect five measures of attribute importance: full profile conjoint estimates, ranges in attribute level attractiveness ratings, regression coefficients, graded paired comparisons, and self-reported ratings. We find that all importance measures are affected by the range manipulation. The number of attribute levels affects only two measures. The results allow us to benchmark the magnitude of the number-of-levels effect against the range effect: conjoint importance estimates were approximately equally affected by a threefold increase in the range of attribute variation and by the insertion of two intermediate attribute levels. Our findings show that the number-of-levels effect is most...
Tipo: Working or Discussion Paper
Palavras-chave: Attribute importance; Context effects; Conjoint analysis; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/46449

The Risk Averting WTP of Visitors to the East Coast of Korea
Provedor de dados: 31
Autores: Shin,   Hio-Jung; Meister,   Anton D.; Choi,   Ik-Chang.
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer/Household Economics; Environmental Economics and Policy; International Relations/Trade; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/97793

Network Governance at the Firm and Network Level: Goals, Routines, and Social Mechanisms
Provedor de dados: 31
Autores: Ziggers,   Gerrit Willem; Gagalyuk,   Taras; Hanf,   Jon Henrich.
This article contributes to the general understanding of governance in networks and the achievement of private and common goals. Integrating transaction costs and social network theory, a simple integrated framework is provided for understanding why firms collaborate and under which conditions they establish durable networks that succeed in achieving goals. Network theory is extended by explicitly distinguishing between firm and network level governance, and by identifying governance mechanisms that adapt, coordinate, and safeguard customized exchanges. This way issues as how networks evolve, how they are governed, and ultimately, how collective outcomes might be generated can be better comprehended. This is especially relevant to policy planners and those...
Tipo: Journal Article
Palavras-chave: Network governance; Social network theory; Governance mechanisms.; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/101286

Semiparametric analysis of case–control genetic data in the presence of environmental factors
Provedor de dados: 31
Autores: Marchenko,   Yulia V.; Carroll,   Raymond J.; Lin,   Danyu Y.; Amos,   Christopher I.; Gutierrez,   Roberto G.
In the past decade, many statistical methods have been proposed for the analysis of case–control genetic data with an emphasis on haplotype-based disease association studies. Most of the methodology has concentrated on the estimation of genetic (haplotype) main effects. Most methods accounted for environmental and gene–environment interaction effects by using prospective-type analyses that may lead to biased estimates when used with case–control data. Several recent publications addressed the issue of retrospective sampling in the analysis of case–control genetic data in the presence of environmental factors by developing efficient semiparametric statistical methods. This article describes the new Stata command haplologit, which implements efficient...
Tipo: Article
Palavras-chave: Haplologit; Haplotype-based analysis; Haplotype–environment independence; Case–control data; Hardy–Weinberg equilibrium; Profile likelihood; Retrospective study; Single nucleotide polymorphisms (SNPs); Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122596

Avoiding biases from data-dependent specification search: an application to a tillage choice model
Provedor de dados: 31
Autores: Sengupta,   Sanchita; Kurkalova,   Lyubov A.; Kling,   Catherine L.
The study evaluates the gains of avoiding data-dependent specification search on an estimation sample in an application to discrete choice models. We incorporate data splitting, the process by which the total available sample is randomly split in two or more sub-samples with the first (specification) sub-sample used for specification search, and the second (estimation) sub-sample used for obtaining clean estimates using the model chosen on the specification sub-sample according to a set criterion. We estimate 14 binary Logit models of the adoption of conservation tillage corresponding to the major sub-watersheds of the Upper Mississippi River Basin. For each of the sub-watershed models, we use the specification sub-sample to choose the explanatory...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21399

Parma Agrifood Research Management Knowledge Network: PARMa KN
Provedor de dados: 31
Autores: Braga,   Francesco S.; Baker,   Gregory A.
The case focuses on the proposed development of the Parma Agrifood Research Management Knowledge Network (PARMa KN). The PARMa KN is intended to be a global network of leading professionals drawn from academia, industry, and the public sector. The proposal is for the group to be funded by the City of Parma and corporate, foundation, and individual donors. Its main objective would be to build value for society through the development of cutting-edge research, educational programs, and service activities for firms in the food and agribusiness sector. It is hoped that the new foundation will bring international expertise to food and agribusiness firms in Parma to help them to expand and remain globally competitive.
Tipo: Journal Article
Palavras-chave: Consulting; Trade association; Industry association; SWOT; Industry research; Industrial Organization; International Relations/Trade; Research Methods/ Statistical Methods; Q10; Q17.
Ano: 2008
URL: http://purl.umn.edu/53730

Stings in the tails: Detecting and dealing with censored data
Provedor de dados: 31
Autores: Conroy,   Ronan M.
Variables often show evidence of clustering at extreme values and of graininess, that is, of a limited number of distinct values. Scores on two subscales of a quality-of-life measure, traditionally analyzed with OLS regression or ANOVA models, provide examples. Ignoring or failing to detect such features of the data will result in poor estimates of effect size.
Tipo: Journal Article
Palavras-chave: Censored data; Diagnostic plots; Intreg; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117528

ENTROPY-BASED ESTIMATION AND INFERENCE IN BINARY RESPONSE MODELS UNDER ENDOGENEITY
Provedor de dados: 31
Autores: Miller,   Douglas J.; Mittelhammer,   Ronald C.; Judge,   George G.
This paper considers estimation and inference for the binary response model in the case where endogenous variables are included as arguments of the unknown link function.  Semiparametric estimators are proposed that avoid the parametric assumptions underlying the likelihood approach as well as the loss of precision when using nonparametric estimation.  Suggestions are made for how the utility maximization decision model can be altered to permit attributes to vary across alternatives.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20319

What Can Be Learned from Calculating Value-Added?
Provedor de dados: 31
Autores: Stanton,   Bernard F.
Tipo: Working Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/121485

A Stochastic Differential Equation for Modeling the “Classical” Probability Distributions
Provedor de dados: 31
Autores: Hertzler,   Greg.
Stochastic differential equations are a flexible way to model continuous probability distributions. The most popular differential equations are for non-stationary Lognormal, non-stationary Normal and stationary Ornstein-Uhlenbeck distributions. The probability densities are known for these distributions and the assumptions behind the differential equations are well understood. Unfortunately, the assumptions do not fit most situations. In economics and finance, prices and quantities are usually stationary and positive. The Lognormal and Normal distributions are nonstationary and the Normal and Ornstein-Uhlenbeck distributions allow negative prices and quantities. This study derives a stochastic differential equation that includes most of the classical...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/57891

Two Ways of Estimating a Transport Model
Provedor de dados: 31
Autores: Jansson,   Torbjorn.
In this article, it is shown how the parameters of a transport model can be estimated in a way that, in contrast to previously used methods, utilizes observations of regional prices as well as of trade costs. The proposed method uses bi-level programming to minimize a weighted least squares’ criterion under the restriction that the estimated parameters satisfy the Kuhn-Tucker conditions for an optimal solution of the transport model. We use Monte-Carlo simulations to trace out some properties of the estimator and compare it with a traditional calibration method. The analysis shows that the proposed technique estimates prices as well as trade costs more efficiently.
Tipo: Working or Discussion Paper
Palavras-chave: Spatial equilibrium; Transport model; Bi-level programming; Research Methods/ Statistical Methods; C15; F11.
Ano: 2005
URL: http://purl.umn.edu/18787

IMPACTS OF CAP REFORM ON RURAL EMPLOYMENT: A MULTIMODELING CROSS COUNTRY APPROACH
Provedor de dados: 31
Autores: Mattas,   Konstadinos; Arfini,   Filippo; Midmore,   Peter; Schmitz,   P. Michael; Surry,   Yves R.
Expected impacts due to recently introduced CAP reforms can be felt beyond the agricultural sector affecting the entire regional economy. Employment levels will be affected within the farming sector and probably non-agricultural sector will feel the pinch too. Policies influencing employment levels attract the attention of the media and the public. Therefore, policy makers are more sensitive on employment issues than rural and agricultural policies as it is widely admitted that no vibrant regions in Europe can be envisioned without enhancing job opportunities. The influence of CAP reform on employment has not been thoroughly studied within a comprehensive approach, accounting for agricultural and non-agricultural effects and covering the diversity of EU...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP reform; Rural employment; I/O analysis; PMP; Qualitative analysis.; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q12; Q18; R15.
Ano: 2008
URL: http://purl.umn.edu/44801

Stata tip 1: The eform() option of regress
Provedor de dados: 31
Autores: Newson,   Roger.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116201

Making the world market price endogenous within the AGMEMOD modelling framework: an econometric solution
Provedor de dados: 31
Autores: Listorti,   Giulia; Esposti,   Roberto.
This paper aims at making the world price endogenous within the AGMEMOD modelling approach. This approach constructs country-level commodity market models where supply and demand sides are equalized on the basis of the observed domestic prices. These prices are endogenous as they depend (price transmission equation) on a EU key-price, which is, in turn, endogenously determined by the world price (price formation equation). The world prices, however, are assumed to be exogenous. To make the world price endogenous, we propose a system of equations where the EU key-price and the world price are simultaneously determined. This system of equations, written in a dynamic and error-correction form (VECM), substitutes the usual price-formation equation, while price...
Tipo: Conference Paper or Presentation
Palavras-chave: Price Formation and Transmission; Commodity Market Models; VECM; Demand and Price Analysis; Research Methods/ Statistical Methods; Q110; Q170.
Ano: 2008
URL: http://purl.umn.edu/6659

A Bayesian Large Deviations Probabilistic Interpretation and Justification of Empirical Likelihood
Provedor de dados: 31
Autores: Grendar,   Marian; Judge,   George G.
In this paper we demonstrate, in a parametric Estimating Equations setting, that the Empirical Likelihood (EL) method is an asymptotic instance of the Bayesian non-parametric Maximum-A-Posteriori approach. The resulting probabilistic interpretation and justifcation of EL rests on Bayesian non-parametric consistency in L-divergence.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/7191

Cost-Effectiveness Evaluation of Swiss Agri-Environmental Measures on Sector Level
Provedor de dados: 31
Autores: Schader,   Christian; Sanders,   Jurn; Offermann,   Frank; Lampkin,   Nicolas; Stolze,   Matthias.
This paper focuses on non-linear programming models and their suitability for ex-ante evaluations of agri-environmental policies on sector level. An approach is presented to compare organic farming payments as a multi-objective policy, with other, more targeted agri-environmental policies in Switzerland. The Swiss version of the comparative static sector-consistent farm group model FARMIS is able to group the sector’s farms into organic and non-organic farms and optimise them separately. CH-FARMIS is expanded with three modules particularly for this study: a) allowing for the simulation of uptake; b) integrating life cycle assessment data for energy use, eutrophication and biodiversity; and c) estimating the policy and farm-group-specific public...
Tipo: Conference Paper or Presentation
Palavras-chave: Positive mathematical programming; Life cycle assessment; Organic farming; Environmental indicators; Economic efficiency; Agricultural and Food Policy; Farm Management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6604

ESTIMATING DYNAMIC RECREATIONAL DEMAND BY THE HEDONIC TRAVEL COST METHOD
Provedor de dados: 31
Autores: Yeh,   Chia-Yu; Sohngen,   Brent.
This research explores how recreational values change over time. Hedonic functions linking travel costs to site amenities are estimated using data on nearly 70,000 visitors to Ohio State Parks from 1997 to 2002. The results suggest substantial changes in recreational values over time. Effects are estimated to show the importance of capturing changes in the hedonic prices.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20165

Incorporating issues of risk and uncertainty into Choice Modelling experiments
Provedor de dados: 31
Autores: Wang,   Xuehong; Rolfe,   John.
Many policy issues, as well as policy funding and management choices, have elements of risk and uncertainty. This means that choice experiments, such as those used in choice modelling (CM), may need to frame trade-offs so that risk and uncertainty are included.  This research aims to explore some methodological approaches to identify and treat uncertainty in CM experiments. A review of theoretical models, as well as a case study application in the CM technique reported by Roberts et al. (2008), suggests that including uncertainty information in the choice sets should influence responses significantly. However, key challenges remain to define and describe the elements of risk and uncertainty that are to be included in a choice experiment, to communicate the...
Tipo: Report
Palavras-chave: Choice experiments; Risk; Uncertainty; Information; Framing.; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94812

THE EFFECTS OF SINGLE FARM PAYMENTS ON SCOTTISH AGRICULTURE: A CGE MODELING APPROACH
Provedor de dados: 31
Autores: Gelan,   Ayele; Schwarz,   Gerald.
Using a CGE model calibrated on Scottish data, this paper examines two important issues related to evaluating impacts of the Single Farm Payment. These are specification of product transformation functions and investigation into supply elasticity parameter. Simulation results from a standard CGE were compared with those from an alternative optimisation framework proposed in this study. The latter yielded a policy effect that is likely to represent behaviour of a profit maximising farmer. The parameter sensitivity analysis showed the important role differences in supply conditions can play; which implied a need for further econometric studies to estimate supply parameters.
Tipo: Conference Paper or Presentation
Palavras-chave: Single farm payments; Decoupling; Multi-output farming; Farm types; CET function; CGE modelling; Agricultural Finance; Demand and Price Analysis; Farm Management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6470

Adoption and Profitability of Breeding Technologies on United States Dairy Farms
Provedor de dados: 31
Autores: Khanal,   Aditya R.; Gillespie,   Jeffrey M.
Adoption decisions and profitability of advanced breeding technologies are analyzed for U.S. dairy farms. The bivariate probit with selection model is used. Results show that specialized, younger, more educated farmers with longer planning horizons are more likely to adopt the technologies, with positive impacts on profitability and negative influences on cost of production.
Tipo: Conference Paper or Presentation
Palavras-chave: Breeding technologies; Dairy; Profitability; Bivariate probit; Selection; Artificial insemination; Sexed semen; Embryo transfer; Farm Management; Livestock Production/Industries; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/98574

Maximum likelihood estimation of endogenous switching regression models
Provedor de dados: 31
Autores: Lokshin,   Michael; Sajaia,   Zurab.
This article describes the movestay Stata command, which implements the maximum likelihood method to fit the endogenous switching regression model.
Tipo: Journal Article
Palavras-chave: Movestay; Endogenous variables; Maximum likelihood; Limited dependent variables; Switching regression; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116249

Making regression tables from stored estimates
Provedor de dados: 31
Autores: Jann,   Ben.
Organizing and archiving statistical results and processing a subset of those results for publication are important and often underestimated issues in conducting statistical analyses. Because automation of these tasks is often poor, processing results produced by statistical packages is quite laborious and vulnerable to error. I will therefore present a new package called estout that facilitates and automates some of these tasks. This new command can be used to produce regression tables for use with spreadsheets, LaTeX, HTML, or word processors. For example, the results for multiple models can be organized in spreadsheets and can thus be archived in an orderly manner. Alternatively, the results can be directly saved as a publication-ready table for...
Tipo: Journal Article
Palavras-chave: Estout; Estoutdef; Estadd; Estimates; Regression table; Latex; Html; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117522

Measuring the Effects of Environmental Regulations: The Critical Importance of a Spatially Disaggregated Analysis
Provedor de dados: 31
Autores: Auffhammer,   Maximilian; Bento,   Antonio M.; Lowe,   Scott E.
We examine the effects of the 1990 Clean Air Act Amendments (CAAA) on ambient concentrations of PM10 in the United States between 1990 and 2005. Consistent with prior literature, we find that non-attainment designation has no effect on the average monitor in non-attainment counties, after controlling for weather, socioeconomic characteristics at the county level and lagged concentrations. In sharp contrast, if we allow for heterogeneous treatment by type of monitor and county, we do find that the 1990 CAAA produced substantial effects. Our estimation results suggest that non-attainment counties with single monitors experienced a drop in concentrations of 10.5% relative to attainment counties. In non-attainment counties with multiple monitors, the overall...
Tipo: Working or Discussion Paper
Palavras-chave: Air Pollution; Clean Air Act; Spatial Modeling; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q53; Q58.
Ano: 2007
URL: http://purl.umn.edu/6088

Structural Estimation of Rank-Order Tournament Games with Private Information
Provedor de dados: 31
Autores: Vukina,   Tomislav; Zheng,   Xiaoyong.
In this paper we propose a game-theoretic model of a rank-order tournament with private information and characterize its equilibrium solution. The model captures many important features of the production contracts once observed in the poultry industry. We use the contract settlement data from a poultry company who used rank-order tournaments to remunerate their contract growers and estimate a fully structural model of a symmetric Nash-equilibrium of this game. We show that growers' equilibrium effort depends on three factors: the spread in piece rates between the performance brackets, the number of players in each tournament, and the number of performance brackets used. We use the estimates of the productivity shocks density to simulate how changes in...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21059

Revisiting Cheap Talk with New Evidence from a Field Experiment
Provedor de dados: 31
Autores: Silva,   Andres; Nayga,   Rodolfo M., Jr.; Campbell,   Benjamin L.; Park,   John L.
We assess the reduction of hypothetical bias in consumers’ willingness to pay (WTP) for products by applying a generic, short, and neutral cheap talk script in a retail setting. Using an open-ended elicitation mechanism with non-hypothetical, hypothetical, and hypothetical with cheap talk treatments, our results indicate that the hypothetical WTP values are higher than the nonhypothetical values, but the hypothetical with cheap talk values are not significantly different from non-hypothetical estimates.
Tipo: Journal Article
Palavras-chave: BDM; Cheap talk; Field experiment; Hypothetical bias; Willingness-to-pay; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/117168

Assessing the marginal dollar value losses to an estuarine ecosystem from an aggressive alien invasive crab
Provedor de dados: 31
Autores: Bell,   Brian A.; Menzies,   Sharon; Yap,   Michael; Kerr,   Geoffrey N.
This paper reports on a case study to establish dollar values for loss of biodiversity in the New Zealand coastal marine environment. The study uses the European Shore Crab (Carcinas maenas) as the example alien invasive species and the Pauatahanui Inlet, Wellington, New Zealand, as the ecosystem representative of the coastal marine environment. Choice modelling is the stated preference tool used to elicit marginal dollar values for these various attributes of the inlet. Reallocation of existing government expenditure is used as the payment mechanism. Results indicate a wide range of dollar values for the marginal losses to the environment, with no clear trend on a distance-decay relationship. The probability distributions of the dollar values of the...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice modelling; Tax reallocation; Biosecurity; Coastal marine; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/5978

THE EVOLUTION OF AGRICULTURAL SOIL QUALITY: A METHODOLOGY FOR MEASUREMENT AND SOME LAND MARKET IMPLICATIONS
Provedor de dados: 31
Autores: Kim,   Kwansoo; Barham,   Bradford L.; Coxhead,   Ian A.
We apply two innovative econometric approaches to crop trials data to examine effects of rotations and fertilizer use on dynamics of soil quality and corn yields.  First, we develop a random coefficients model of yield responses to nitrogen fertilizer and rotations to evaluate both short- and long-run substitutability of N fertilizer for rotation.  Second, we construct a dynamic structural model to explicitly recover an indirect but general measure of soil quality.  The results yield insights about optimal soil-conserving investments under asymmetric information.
Tipo: Conference Paper or Presentation
Palavras-chave: Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20889

Consumer Perceptions of Sustainable Farming Practices: A Best-Worst Scenario
Provedor de dados: 31
Autores: Sackett,   Hillary M.; Shupp,   Robert S.; Tonsor,   Glynn T.
This paper uses data collected in the summer and fall of 2010 from a national, web-based survey of 1002 households to initiate the process of examining consumer inferences and valuations of food products making "sustainably produced” claims. A Best-Worst scaling framework was implemented to identify what consumers believe “sustainably produced” labels mean and their preferences for each of the individual sustainable farming practices. The best-worst survey method forces respondents to make trade-offs by simultaneously choosing the most and least preferred attributes. The measured level of concern is then applied to a ratio scale. The ability of a firm to differentiate their product hinges critically on an accurate understanding of the perceptions consumers...
Tipo: Conference Paper or Presentation
Palavras-chave: Sustainably Produced Food; Consumer Perceptions; Best-Worst; Agricultural and Food Policy; Consumer/Household Economics; Research Methods/ Statistical Methods; Q01; Q13; Q11.
Ano: 2011
URL: http://purl.umn.edu/103791

A closer examination of subpopulation analysis of complex–sample survey data
Provedor de dados: 31
Autores: West,   Brady T.; Berglund,   Patricia; Heeringa,   Steven G.
In recent years, general-purpose statistical software packages have incorporated new procedures that feature several useful options for design-based analysis of complex-sample survey data. A common and frequently desired technique for analysis of survey data in practice is the restriction of estimation to a subpopulation of interest. These subpopulations are often referred to interchangeably in a variety of fields as subclasses, subgroups, and domains. In this article, we consider two approaches that analysts of complex-sample survey data can follow when analyzing subpopulations; we also consider the implications of each approach for estimation and inference. We then present examples of both approaches, using selected procedures in Stata to analyze data...
Tipo: Article
Palavras-chave: Survey data analysis; Statistical software; Complex sample designs; Subpopulation analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122618

Stata tip 24: Axis labels on two or more levels
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117536

Assessing the Opportunity Cost of Growing a Bioenergy Crop in California: a PMP Approach
Provedor de dados: 31
Autores: Yi,   Fujin; Merel,   Pierre R.; Lee,   Juhwan; Six,   Johan.
A significant increase in demand for fuel ethanol in California should be expected if all gasoline sold in the state were to be blended with 10% ethanol, as envisaged in the State Alternative Fuels Plan. This paper assesses the potential of California agriculture to supply biofuel feedstock in the form of switchgrass. We construct a fully calibrated, multi-region, multi-input and multi-output model of agricultural supply for California’s Central Valley based on the principles of Positive Mathematical Programming. We exploit the biogeochemical model DAYCENT to estimate production functions for switchgrass in each agricultural region. We then predict the extent and location of potential switchgrass production in the Central Valley. Our results suggest that...
Tipo: Conference Paper or Presentation
Palavras-chave: California agriculture; Bioenergy crop; Opportunity cost; Positive mathematical programming; Crop Production/Industries; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/104519

Rasch analysis: Estimation and tests with raschtest
Provedor de dados: 31
Autores: Hardouin,   Jean-Benoit.
Analyzing latent variables is becoming more and more important in several fields, such as clinical research, psychology, educational sciences, ecology, and epidemiology. The item response theory allows analyzing latent variables measured by questionnaires of items with binary or ordinal responses. The Rasch model is the best known model of this theory for binary responses. Although one can estimate the parameters of the Rasch model with the clogit or xtlogit command (or with the unofficial gllamm command), these commands require special data preparation. The proposed raschtest command easily allows estimating the parameters of the Rasch model and fitting the resulting model.
Tipo: Article
Palavras-chave: Raschtest; Rasch model; Generalized estimating equations; Conditional maximum likelihood method; Marginal maximum likelihood method; Andersen Z test; Van den Wollenberg Q1 test; R1c; R1m; Fit tests; Item response theory; U test; Splitting test; Item characteristics curves; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119253

Evaluation on the Sustainable Development of Agricultural Industrialization Based on DPSIR Model - A Case of North Bay Economic Zone in Guangxi Province
Provedor de dados: 31
Autores: Wang,   Qiang; Huang,   Hu.
According to the connotation of agricultural industrialization, the DPSIR model based on agricultural industrialization is introduced from the five aspects of driving fore, pressure, state, impact and response. Taking the North Bay Economic Zone of Guangxi Province as an example, a total of 23 indices are selected to construct the evaluation index system of sustainable development for agricultural industrialization by using the Analytic Hierarchy Process. And the sustainable development level is comprehensively evaluated by weighted method. The result shows that driving force factor is still in a worse state. Industry, house sites and unreasonable agricultural productive ways have caused obvious pressure on agricultural industrialization. The scores of...
Tipo: Thesis or Dissertation
Palavras-chave: Agricultural industrialization; DPSIR; Sustainable development; North Bay Economic Zone of Guangxi Province; China; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53820

PMP and Uniqueness of the Calibrating Solution - Revision
Provedor de dados: 31
Autores: Paris,   Quirino.
This paper demonstrates the existence of a unique solution of the PMP problem when both observed output quantities and limiting input prices are taken as calibrating benchmarks. This version of PMP avoids the use of a user-determined small positive number ε originally introduced for guaranteeing that the dual (shadow) price of binding input constraints be positive. Furthermore, the paper shows how to obtain endogenous output supply and input demand elasticities that match available information about them in the form of previously estimated parameters for an entire region or sector. The framework is applied to a sample of farms also for the case that admits no production for some of the crop activities. The calibrating solution is very close to the observed...
Tipo: Working Paper
Palavras-chave: Positive mathematical programming; Solution uniqueness; Supply elasticities; Calibrating model; Productivity Analysis; Research Methods/ Statistical Methods; C6.
Ano: 2015
URL: http://purl.umn.edu/200491

GENERAL MOMENT AND QUASI-MAXIMUM LIKELIHOOD ESTIMATION OF A SPATIALLY AUTOCORRELATED SYSTEM OF EQUATIONS: AN EMPIRICAL EXAMPLE USING ON-FARM PRECISION AGRICULTURE DATA
Provedor de dados: 31
Autores: Lambert,   Dayton M.; Malzer,   Gary L.; Lowenberg-DeBoer,   James.
This paper compares two estimation methods of a three-stage least squares (3SLS) system of equations, corrected for spatial autocorrelation. The modeling approach is novel in that it is an extension of Anselin's (1988) seemingly unrelated regression (SUR) space-time spatial error model for panel data. An empirical comparison of the quasi-maximum likelihood (QML) estimation of the equation system, and Kelejian and Prucha's general moments (GM) estimation approach is presented. The model and estimation procedures introduced in this study are easily extended to other economic, agronomic, or biological models that must incorporate spatial and temporal effects in the model specification, and overcome simultaneous equation bias. The empirical example used in...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/28667

A REVIEW OF THE ESTIMATION OF TRANSITION PROBABILITIES IN MARKOV CHAINS
Provedor de dados: 31
Autores: Dent,   Warren Thomas; Ballintine,   Richard.
A chronological review of the development of estimation procedures for unknown constant Markovian transition probabilities is presented with emphasis on applications involving the availability of macrodata, as opposed to microdata. Monte Carlo results comparing various estimation methods are analysed and several suggestions for estimating non-stationary probabilities are made.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1971
URL: http://purl.umn.edu/22286

Accuracy of Numerical Solution to Dynamic Programming Models
Provedor de dados: 31
Autores: King,   Robert P.; Lohano,   Heman D.
Dynamic programming models with continuous state and control variables are solved approximately using numerical methods in most applications. We develop a method for measuring the accuracy of numerical solution of stochastic dynamic programming models. Using this method, we compare the accuracy of various interpolation schemes. As expected, the results show that the accuracy improves as number of nodes is increased. Comparison of Chebyshev and linear spline indicates that the linear spline may give higher maximum absolute error than Chebyshev, however, the overall performance of spline interpolation is better than Chebyshev interpolation for non-smooth functions. Two-stage grid search method of optimization is developed and examined with accuracy analysis....
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/14230

Consumer Preferences for Olive Oil in Tirana, Albania
Provedor de dados: 31
Autores: Chan-Halbrendt,   Catherine; Zhllima,   Edvin; Sisior,   Gwendalyn; Imami,   Drini; Leonetti,   Luciano.
Increase in urban middle income consumers along with consolidation of the retail sector has created changes in olive oil consumption preferences in Albania. The objective of this study is to inform stakeholders in the olive oil industry about consumer preferences. A Conjoint Choice Experiment (CCE) was used to design the survey and latent class approach used to analyze the data. The results show a strong preference for domestic olive oil and small niche markets that cater to specific consumers. The study also shows a gap between preference and reality that needs to be addressed by the stakeholders in the olive oil industry.
Tipo: Journal Article
Palavras-chave: Olive oil; Albania; Latent Class; Consumer preference; Conjoint choice; Experiment; Consumer/Household Economics; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93559

Continuous Improvement and Innovation as an Approach to Effective Research and Development: A 'Trident' Evaluation of the Beef Profit Partnerships Project
Provedor de dados: 31
Autores: Madzivhandila,   T.P.; Groenewald,   Izak; Griffith,   Garry R.; Fleming,   Euan M.
Effective socio-economic service delivery is vital for alleviating poverty in developing countries. Increased financial support without complementary investment in service delivery mechanisms often results in little or no impact. This paper contributes to the discussion on how to maximize the impact of agricultural R&amp;D. The case study examined is the South African Beef Profit Partnerships project that is underpinned by the Continuous Improvement and Innovation process. The evidence is presented using a ‘trident’ evaluation approach: a description and analysis of the process followed; the measurement of the outcomes achieved (impact); and the perspectives of the stakeholders involved.
Tipo: Conference Paper or Presentation
Palavras-chave: Continuous Improvement and Innovation; Beef Profit Partnerships project; Socio-Economic Development; Sustainable Livelihoods; Research and Development; International Development; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6017

PUTTING THE "ECON" INTO ECONOMETRICS
Provedor de dados: 31
Autores: Dorfman,   Jeffrey H.; McIntosh,   Christopher S.
Should econometricians always incorporate economic theory in their models or only when unrestricted estimators are found to violate an inviolable theory?  Using Monte Carlo experiments, we find that econometricians should use economic theory to the fullest extent possible.  To paraphrase Leamer's classic article, we should put the "econ" into econometrics.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20874

NASYP: Online expert tool on the control of major-accident hazards involving dangerous substances
Provedor de dados: 31
Autores: Kahuda,   Daniel; Vach,   Marek; Cerba,   Otakar; Krivanek,   Zbynek; Jezek,   Jan; Charvat,   Karel; Vohnout,   Premysl; Dvorak,   V.
NASYP is an online Geoportal tool being developed in cooperation with state and regional authorities to improve insufficient practices based on implementation of Directive nr. 2003/105/ES on the control of major-accident hazards involving dangerous substances. The tool is applicable for managing the permits, reporting and regular monitoring issues. Furthermore, it’s applicable for a risk assessment and a rapid management of disasters in the initial phase. There’re simple modeling tools included to simulate early stages of the contamination caused by disasters occurred to be used for decision making and effective use of emergency services. In this manner, there’re low atmospheric and surface water pollutions taken into account. For the study area, Liberec...
Tipo: Journal Article
Palavras-chave: Spatial data; Geoportal; Risk management; Modelling; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Risk and Uncertainty; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/116384

RELEVANCE OF DUALITY THEORY TO THE PRACTICING AGRICULTURAL ECONOMIST:  DISCUSSION
Provedor de dados: 31
Autores: Chambers,   Robert G.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32266

Multiple imputation of missing values
Provedor de dados: 31
Autores: Royston,   Patrick.
Following the seminal publications of Rubin about thirty years ago, statisticians have become increasingly aware of the inadequacy of “complete-case” analysis of datasets with missing observations. In medicine, for example, observations may be missing in a sporadic way for different covariates, and a complete-case analysis may omit as many as half of the available cases. Hotdeck imputation was implemented in Stata in 1999 by Mander and Clayton. However, this technique may perform poorly when many rows of data have at least one missing value. This article describes an implementation for Stata of the MICE method of multiple multivariate imputation described by van Buuren, Boshuizen, and Knook (1999). MICE stands for multivariate imputation by chained...
Tipo: Journal Article
Palavras-chave: Mvis; Uvis; Micombine; Mijoin; Misplit; Missing data; Missing at random; Multiple imputation; Multivariate imputation; Regression modeling; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116244

Economic Impact of Vertical Coordination: A Multi-stage, Multi-player Analysis
Provedor de dados: 31
Autores: Asirvatham,   Jebaraj; Bhuyan,   Sanjib.
Using explicit theoretical models, this study analyzes the economic impact of alternative vertical coordination mechanisms in a three-stages production-marketing chain where interactions among multiples players at each stage, among players at different stages, and the price, output and welfare impact of such strategic behavior were computed.  Policy implications are discussed.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20400

Adaptive, participatory and integrated assessment (APIA) of the impacts of irrigation on fisheries: Evaluation of the approach in Sri Lanka.
Provedor de dados: 31
Autores: Nguyen-Khoa,   Sophie; Smith,   Laurence; Lorenzen,   Kai.
Tipo: Working or Discussion Paper
Palavras-chave: Fisheries; Irrigation effects; Assessment; Decision making; Case studies; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/92016

Multiple imputation of missing values: Update of ice
Provedor de dados: 31
Autores: Royston,   Patrick.
Royston (2004) introduced mvis, an implementation for Stata of MICE, a method of multiple multivariate imputation of missing values under missing-at-random (MAR) assumptions. In a second article, Royston (2005) described ice, an upgrade incorporating various improvements and changes to the software based on personal experience, discussion with colleagues, and user requests. This article describes an update to ice. The changes are less substantial but nevertheless important enough to warrant a brief explanation. The major modification is that the default method of imputing missing values in ice is now by sampling from the posterior predictive distribution rather than by predicted mean matching.  The ice system comprises five ado-files: ice, micombine,...
Tipo: Journal Article
Palavras-chave: Ice; Uvis; Multiple imputation; Missing values; Update; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117543

Efficient design for willingness to pay in choice experiments: evidence from the field
Provedor de dados: 31
Autores: Kerr,   Geoffrey N.; Sharp,   Basil M.H.
Efficient experimental designs offer the potential to reduce confidence intervals for parameters of interest in choice models, or to reduce required sample sizes. C-efficiency recognizes the salience of willingness to pay estimates rather than utility function parameters. This study reports on a choice model application that incorporated updated statistical designs based on initial responses in order to maximize C-efficiency. The revised design delivered significant improvements.
Tipo: Conference Paper or Presentation
Palavras-chave: Experimental design; Choice experiment; Efficiency; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/97156

LAND MARKETS IN AGENT BASED MODELS OF STRUCTURAL CHANGE
Provedor de dados: 31
Autores: Kellermann,   Konrad; Sahrbacher,   Christoph; Balmann,   Alfons.
Replaced with revised version of paper 02/22/08.
Tipo: Conference Paper or Presentation
Palavras-chave: Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6647

Risk, Information and Trust in the Food Chain: Factors Explaining  Consumer Willingness to Pay
Provedor de dados: 31
Autores: Latvala,   Terhi.
The safety of food in the food chain has become an increasingly interesting issue to consumers and the media. It has also become a source of concern, as the amount of information on the risks related to food safety continues to expand. The purpose of this study was to identify factors contributing to consumers’ willingness to pay for increased quality information. The second purpose of this study was to examine what kind of information flows are required to ensure quality and safety in the food chain for beef, and who should produce that information. Studying the willingness to pay of consumers makes it possible to determine whether the consumers consider the quantity of information available on the safety and quality of beef sufficient. The empirical...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/100594

Estimating Economies of Scope Using Profit Function: A Dual Approach of the Normalized Quadratic Profit Function
Provedor de dados: 31
Autores: Gao,   Zhifeng; Featherstone,   Allen M.
Replaced with revised version of paper 06/26/06.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21103

Modeling Certainty-Adjusted Willingness to Pay for Ecosystem Service Improvement  from Agriculture
Provedor de dados: 31
Autores: Ma,   Shan; Lupi,   Frank; Swinton,   Scott M.; Chen,   Huilan.
The public demand for ecosystem services measured by willingness to pay (WTP) in contingent valuation studies provides important information for designing Payment-for-Ecosystem-Service (PES) programs. However, the hypothetical markets for contingent valuation and respondents’ unfamiliarity with certain ecosystem services may increase their preference uncertainty, which may increase variance and even cause bias in WTP estimates. Taking advantage of a unique stated preference data set that includes a follow-up question rating the respondent’s certainty level, this study evaluates alternative methods of modeling certainty-adjusted WTP for cleaner lakes and abated global warming. Results suggest that the incorporation of self-reported uncertainty into binary...
Tipo: Conference Paper or Presentation
Palavras-chave: Contingent valuation; Willingness to Pay; Preference Uncertainty; Numerical certainty scale; Ecosystem services; Environmental Economics and Policy; Research Methods/ Statistical Methods; Risk and Uncertainty; Q51; Q57.
Ano: 2011
URL: http://purl.umn.edu/103734

Maximum simulated likelihood estimation of a negative binomial regression model with multinomial endogenous treatment
Provedor de dados: 31
Autores: Deb,   Partha; Trivedi,   Pravin K.
We describe specification and estimation of a multinomial treatment effects negative binomial regression model. A latent factor structure is used to accommodate selection into treatment, and a simulated likelihood method is used for estimation. We describe its implementation via the mtreatnb command.
Tipo: Journal Article
Palavras-chave: Mtreatnb; Multinomial treatment effects; Latent factors; Count data; Negative binomial; Multinomial logit; Multinomial logistic; Halton sequences; Maximum simulated likelihood; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117575

Regional differences evaluation on the capacities of rural basic public services based on topsis method - Demonstration from 31 Cities and Provinces
Provedor de dados: 31
Autores: Liu,   Jin-song.
Capacities of rural basic public services in 31 cities and provinces are evaluated and sorted based on the method of Topsis according to the data of rural education, medical treatment, health and so on during 2006 in China. The empirical results show that there are great differences among the capacities of rural basic public services in most cities and provinces, and their equalization is relatively low. The financial non-equalization is still the biggest obstacle in the process of realizing the equalization of rural basic public services. Finally, this paper put forward some countermeasures and proposals on how to bridge the gap of the equalization of rural basic public services.
Tipo: Thesis or Dissertation
Palavras-chave: Rural areas; Basic public services; Equalization; Evaluation; China; Community/Rural/Urban Development; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53477

Irrigation against rural poverty: an overview of issues and pro-poor intervention strategies in irrigated agriculture in Asia; Proceedings of National Workshops on Pro-Poor Intervention Strategies in Irrigated Agriculture in Asia, Bangladesh, China, India, Indonesia, Pakistan and Vietnam [9-10 August 2001, Colombo, Sri Lanka]
Provedor de dados: 31
Tipo: Presentation
Palavras-chave: Irrigation management; Water resources; Poverty; Sustainability; Rural development; Irrigated farming; Performance evaluation; Case studies; Large scale systems; Surface irrigation; Water use efficiency; Water scarcity; Water policy; Productivity; Farm Management; Food Security and Poverty; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2001
URL: http://purl.umn.edu/118406

Power by simulation
Provedor de dados: 31
Autores: Feiveson,   A.H.
This paper describes how to write Stata programs to estimate the power of virtually any statistical test that Stata can perform. Examples given include the t test, Poisson regression, Cox regression, and the nonparametric rank-sum test.
Tipo: Journal Article
Palavras-chave: Power; Simulation; Random number generation; Postfile; Copula; Sample size; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115955

A Flexible Multistage Demand System Based on Indirect Separability
Provedor de dados: 31
Autores: Moschini,   GianCarlo.
The notion of indirect separability is exploited to derive a new multistage demand system. The model allows a consistent parameterization of demand relations at various budgeting stages and it fulfills the requirement of flexibility while satisfying separability globally. Two propositions are derived to characterize flexible and separable functional forms, which lead to the specification of a flexible and separable translog (FAST) demand system. The model is particularly attractive for modeling large complete demand systems, and is illustrated with an application to Canadian food demand.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods; D11; D12; C51.
Ano: 2000
URL: http://purl.umn.edu/18514

On the Dynamics of Competing Energy Sources
Provedor de dados: 31
Autores: Tsur,   Yacov; Zemel,   Amos.
We characterize the dynamics of energy markets in which energy is derived from polluting (fossil) and clean (solar) resources. The analysis is based on geometric optimal control considerations. An important feature of solar energy technologies is that their cost of supply is predominantly due to upfront investment in capital infrastructure (rather than to actual supply rate) and this feature has important implications for the market allocation outcome. In particular, it gives rise to a threshold behavior in that solar energy is adopted only when the price of fossil energy exceeds a certain threshold. Under this condition solar technologies will (eventually) dominate energy supply by driving fossil energy altogether out of the energy sector. A tax on fossil...
Tipo: Working or Discussion Paper
Palavras-chave: Fossil and solar energy; Characteristic curves; Price thresholds; Environmental regulation; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/93127

Participatory policy evaluation as an innovative method to improve processes of sustainable rural development
Provedor de dados: 31
Autores: Bocher,   Michael.
This paper presents an innovative process-orientated self-evaluation method regarding sustainable rural development processes, developed by the University of Göttingen in cooperation with rural actors and a consultant. This method, which is also available online, can be employed by rural development initiatives in order to manage their own work successfully. The paper presents the general evaluation research design and the computer-based method for the self-evaluation of regional development initiatives. It also discuses the potential problems of such a participatory research design which emerged through important empirical findings
Tipo: Journal Article
Palavras-chave: Sustainable rural development; LEADER+; Policy-evaluation; Germany; Participatory research; Methodology; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/44106

Unpacking the Meaning of “Market Access”
Provedor de dados: 31
Autores: Chamberlin,   Jordan; Jayne,   Thomas S.
Improving farmers’ access to markets is widely recognized as a major development challenge.  A review of the literature suggests that indicators of market access may bear little relationship to the specific processes of interest and hence provide misguided evidence of the impacts of improved market access. This paper attempts to “unpack” the dimensions of market access and, in the process, uses farm survey data from Kenya to investigate changes in multiple indicators during the post-liberalization period.  Findings show that market access conditions experienced by rural Kenyans exhibit considerable variation across time, space, and indicator type. We suggest ways in which structured hypothesizing and sensitivity analysis may strengthen empirical treatments...
Tipo: Working or Discussion Paper
Palavras-chave: Market access; Remoteness; Smallholders; Africa; Kenya; Agricultural and Food Policy; Community/Rural/Urban Development; International Development; Marketing; Research Methods/ Statistical Methods; C81; D01; D63; D83; H41; H54; R58; L99.
Ano: 2011
URL: http://purl.umn.edu/110014

A COMPARISON OF RESAMPLING TECHNIQUES WHEN PARAMETERS ARE ON A BOUNDARY: THE BOOTSTRAP, SUBSAMPLE BOOTSTRAP, AND SUBSAMPLE JACKKNIFE
Provedor de dados: 31
Autores: Hilmer,   Christiana E.; Holt,   Matthew T.
This paper compares the finite sample performance of subsample bootstrap and subsample jackknife techniques to the traditional bootstrap method when parameters are constrained to be on some boundary.  To assess how these three methods perform in an empirical application, a negative semi-definite translog cost function is estimated using U.S. manufacturing data.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21810

The Value of Public Price Forecasts: Additional Evidence in the Live Hog Market
Provedor de dados: 31
Autores: Manfredo,   Mark R.; Sanders,   Dwight R.
USDA and Cooperative Extension Service forecasts of hog prices are directly tested for incremental value vis-à-vis futures-based forecasts in a forecast encompassing framework. At horizons less than six months, the lean hog futures-based forecast is found to be more accurate than both the USDA and Extension Service forecasts, and the difference in forecasting performance is statistically significant. Not only are the agency forecasts less accurate, but neither the USDA nor the Extension Service forecasts add incremental information relative to the futures forecast. The results suggest that extension forecasters may want to refocus forecasting efforts on basis relationships, longer forecast horizons, or commodities without active futures markets.
Tipo: Journal Article
Palavras-chave: Forecast encompassing; Hog prices; Public forecasts; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/59395

A Suggested Criterion for Selecting between E-V and Stochastic Dominance Analysis Tools
Provedor de dados: 31
Autores: Wells,   Gary J.; Bauer,   Larry L.; Kaiser,   Eddie H.; Epperson,   James E.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/116873

MODELLING FARMS' PRODUCTION DECISIONS UNDER EXPENDITURE CONSTRAINTS
Provedor de dados: 31
Autores: Bokusheva,   Raushan; Kumbhakar,   Subal C.
Limited budget for the purchase of variable inputs might adversely affect producer's input use decisions and might result in a non-optimal input usage. If expenditure constrains are present and binding, unconstrained profit-maximization is not valid for modelling producers' input use decisions. In this paper we apply the indirect production function approach which describes output maximization subject to a given technology, a set of quasi-fixed inputs and a given budget for the purchase of variable inputs. By employing the indirect production function in the stochastic frontier framework we can estimate producer's output loss due to both expenditure constraints and technical inefficiency. Our estimation results show that most of the study farms were...
Tipo: Conference Paper or Presentation
Palavras-chave: Indirect production function; SFA; Expenditure constraints; Technical efficiency; Russian agriculture; Farm Management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6641

THE IMPACT OF II PILLAR ON THE MULTIFUNCTIONALITY IN ITALIAN FARMS: ANALYSIS ON THE FARM HOLIDAYS
Provedor de dados: 31
Autores: Galluzzo,   Nicola.
This analysis has examined the relationships between the European funds for rural development and the multifunctionality during a short time, comparing two different situations before and after the Common Agricultural Policy (CAP) reform. The main problem was to find a variable able to describe the multifunctionality; the agritourism, in particular, number of farm holidays farms, has been the dependant variable useful to value the rural multifunctionality and the impact of the increase of II pillar fund. The Principal Component Analysis and the model of Ordinary Least Square have confirmed the positive impact of European Agricultural funds in the rural development and in the increase of active farm holidays farms.
Tipo: Conference Paper or Presentation
Palavras-chave: Agritourism; Farm holidays farms; Italian agritourism; II pillar; Certified quality food.; Agricultural and Food Policy; Research Methods/ Statistical Methods; C01; Q18.
Ano: 2008
URL: http://purl.umn.edu/44850

ECONOMIC VALUATION OF A RIVER CORRIDOR: INTEGRATION OF NATURAL RESOURCE AND DEVELOPMENT ECONOMICS
Provedor de dados: 31
Autores: Hitzhusen,   Frederick J.; Ayalasomayajula,   Radha; Lowder,   Sarah K.
This analysis was supported by Rivers Unlimited and chambers of commerce in communities along the Muskingum River corridor in southeastern Ohio.  Hedonic pricing and travel cost/benefit transfer methods are applied to value and compare various water quality, infrastructure and land use control options for increasing corridor economic value.
Tipo: Conference Paper or Presentation
Palavras-chave: Hedonic Pricing; Benefit Transfer; Cost Benefit Analysis; Agribusiness; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21571

Stata tip 53: Where did my p-values go?
Provedor de dados: 31
Autores: Buis,   Maarten L.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119297

Enhanced routines for instrumental variables/generalized method of moments estimation and testing
Provedor de dados: 31
Autores: Baum,   Christopher F.; Schaffer,   Mark E.; Stillman,   Steven.
We extend our 2003 paper on instrumental variables and generalized method of moments estimation, and we test and describe enhanced routines that address heteroskedasticity- and autocorrelation-consistent standard errors, weak instruments, limited-information maximum likelihood and k-class estimation, tests for endogeneity and Ramsey’s regression specification-error test, and autocorrelation tests for instrumental variable estimates and panel-data instrumental variable estimates.
Tipo: Article
Palavras-chave: Ivactest; Ivendog; Ivhettest; Ivreg2; Ivreset; Overid; Ranktest; Instrumental variables; Weak instruments; GMM; Endogeneity; Heteroskedasticity; Serial correlation; HAC standard errors; LIML; CUE; Overidentifying restrictions; Frisch–Waugh–Lovell theorem; RESET; Cumby–Huizinga test; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119291

An Empirical Investigation of Reputation Loan Size Dynamics in Rural Credit Markets in Honduras
Provedor de dados: 31
Autores: Sundaram-Stukel,   Reka; Barham,   Bradford L.
This paper examines the role of two types of reputation - borrower credit history and productivity - in disequilibrium supply and demand models of loan size dynamics in formal and informal credit markets. Using panel data on Honduran households, full- and partial-information regime switching econometric models yield four principal findings: (1) credit contracts in the formal sector are largely collateral driven and not reputation driven; (2) the informal sector credit contracts are borrower reputation based; (3) the informal sector utilizes positive/negative credit histories in both markets to credibly reward/punish borrowers; and (4) technical efficiency has a positive impact in determining loan size in both sectors on the demand and supply side of the...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/92196

Maximum likelihood and two-step estimation of an ordered-probit selection model
Provedor de dados: 31
Autores: Chiburis,   Richard; Lokshin,   Michael.
We discuss the estimation of a regression model with an ordered-probit selection rule. We have written a Stata command, oheckman, that computes two-step and full-information maximum-likelihood estimates of this model. Using Monte Carlo simulations, we compare the performances of these estimators under various conditions.
Tipo: Article
Palavras-chave: Oheckman; Selection bias; Ordered probit; Maximum likelihood; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119266

The Dual of the Least-Squares Method
Provedor de dados: 31
Autores: Paris,   Quirino.
Econometrics
Tipo: Working Paper
Palavras-chave: Least squares; Primal; Dual; Pythagoras theorem; Noise; Value of sample information; Research Methods/ Statistical Methods; C20; C30.
Ano: 2012
URL: http://purl.umn.edu/121693

Confidence intervals for predicted outcomes in regression models for categorical outcomes
Provedor de dados: 31
Autores: Xu,   Jun; Long,   J. Scott.
We discuss methods for computing confidence intervals for predictions and discrete changes in predictions for regression models for categorical outcomes. The methods include endpoint transformation, the delta method, and bootstrapping. We also describe an update to prvalue and prgen from the SPost package, which adds the ability to compute confidence intervals. The article provides several examples that illustrate the application of these methods.
Tipo: Journal Article
Palavras-chave: Prvalue; Prgen; Confidence interval; Predicted probability; Discrete choice models; Endpoint transformation; Delta method; Bootstrap; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117544

Benefit Transfer: Choice Experiment Results
Provedor de dados: 31
Autores: Kerr,   Geoffrey N.; Sharp,   Basil M.H.
Benefit transfer entails using estimates of non-market values derived at one site as approximations to benefits at other sites. The method finds favour because it can be applied quickly and cheaply, however the validity of benefit transfer is frequently questioned. Published studies generally indicate that errors from the approach can be extremely large and could result in significant resource misallocations. Assessing the validity of benefit transfer is complicated by differences in the nature of study and policy sites, the changes being valued, valuation methods, time of study, availability of substitutes and complements, and demographic, social and cultural differences. A choice experiment was used to evaluate the transferability of benefit estimates...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice model; Choice experiment; Benefit transfer; Mitigation; Agricultural and Food Policy; Environmental Economics and Policy; Financial Economics; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/97774

A COMPARISON OF STATE AND USDA COST AND RETURN ESTIMATES
Provedor de dados: 31
Autores: Libbin,   James D.; Torell,   L. Allen.
Concern has been voiced that U.S. Department of Agriculture (UDSA) Farm Costs and Returns Surveys are used for a wide variety of policy analyses but produce questionable estimates. USDA-developed crop and livestock cost and return estimates for New Mexico and other selected states are compared to estimates developed by state universities. Major differences exist, most important of which relate to the ability of the survey respondent to answer the questions posed. Regardless of the cause of the differences, closer cooperation between the USDA and state universities clearly is needed to develop consistent estimates.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/32056

Classification of the EU countries labour markets
Provedor de dados: 31
Autores: Kaba,   Bohumil.
The objective of the paper is to classify the labour markets of the EU member states on the basis of selected employment and unemployment indicators. In order to achieve the study target, the adequate multivariate exploration procedures have been chosen. In the first part of processing original data, principal component analysis (PCA) was employed. PCA is a multivariate statistical procedure used to reduce the number of observed variables into a smaller number of uncorrelated variables with a minimum loss of information. Moreover, the PCA results can be used for effective ranking of the EU countries according to observed indicators of labour markets. This paper describes the crucial steps in PCA and procedure for ranking mentioned and it reviews how...
Tipo: Journal Article
Palavras-chave: Classification; Employment; Unemployment; Principal component analysis; Cluster; International Development; Public Economics; Research Methods/ Statistical Methods; GA; IN.
Ano: 2010
URL: http://purl.umn.edu/99227

A NOTE ON THE RESPONSE TO AN APPEAL FOR PERSONAL AND CONFIDENTIAL DATA
Provedor de dados: 31
Autores: Thomson,   Norm J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1972
URL: http://purl.umn.edu/23020

Confidence intervals for rank statistics: Somers' D and extensions
Provedor de dados: 31
Autores: Newson,   Roger.
Somers’ D is an asymmetric measure of association between two variables, which plays a central role as a parameter behind rank or nonparametric statistical methods. Given predictor variable X and outcome variable Y , we may estimate DYX as a measure of the effect of X on Y , or we may estimate DXY as a performance indicator of X as a predictor of Y. The somersd package allows the estimation of Somers’ D and Kendall’s τα with confidence limits as well as p-values. The Stata 9 version of somersd can estimate extended versions of Somers’ D not previously available, including the Gini index, the parameter tested by the sign test, and extensions to left- or right-censored data. It can also estimate stratified versions of Somers’ D, restricted to pairs in the...
Tipo: Journal Article
Palavras-chave: Somersd; Somers' D; Kendall's τ_a; Harrell's c; ROC area; Gini index; Population-attributable risk; Rank correlation; Rank-sum test; Wilcoxon test; Sign test; Confidence intervals; Nonparametric methods; Propensity score; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117583

Mata Matters: Using views onto the data
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. In the Mata Matters column, we show how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. In this issue’s column, we explore view matrices, matrices that are views of the underlying Stata dataset rather than copies of it.
Tipo: Journal Article
Palavras-chave: Mata; Views; Memory; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117547

THE EFFECT OF THE NEW SINGLE FARM PAYMENT IN IRRIGATED AGRICULTURE: THE CASE OF SPAIN
Provedor de dados: 31
Autores: Gracia,   Azucena; de Magistris,   Tiziana; Casado,   Jose Maria.
The aim of the paper is to provide an econometric, dynamic, multi-product and partial equilibrium model for the Spanish agriculture able to analyse the effects of the SFP and subsequent reforms in both the irrigated and non-irrigated cultivation. In the case of the EU Mediterranean countries, irrigated agriculture is very relevant because farmers in irrigated land get higher productivity and returns. However, irrigation is also the source of a number of environmental concerns, such as over-abstraction of water from subterranean aquifers, irrigation driven erosion, soil salinisation, etc.. The new decoupling direct payments from production will reduce many of the incentives to intensive production. The developed model is called Spanish Econometric...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP reform; Partial equilibrium model; Policy modelling; Irrigated Agriculture; Simulation; Agricultural and Food Policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6590

Testing for serial correlation in linear panel-data models
Provedor de dados: 31
Autores: Drukker,   David M.
Because serial correlation in linear panel-data models biases the standard errors and causes the results to be less efficient, researchers need to identify serial correlation in the idiosyncratic error term in a panel-data model. A new test for serial correlation in random- or fixed-effects one-way models derived by Wooldridge (2002) is attractive because it can be applied under general conditions and is easy to implement. This paper presents simulation evidence that the new Wooldridge test has good size and power properties in reasonably sized samples.
Tipo: Journal Article
Palavras-chave: Panel data; Serial correlation; Specification tests; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116069

Regional Sustainable Development of Rural Areas Based on HDI - a case of Jilin Province, China
Provedor de dados: 31
Autores: Wang,   Xiao-yan; Chen,   Li-ming.
This paper introduces the connotation of Human Development Index (HDI) and its dimensional indices, as well as the HDI comprehensive evaluation method based on entropy weight. And the specific formula and steps for calculation are put forward. This paper also selects the HDI dimensional indices (life expectancy index, education index and GDP index), and constructs the evaluation index system of regional sustainable development. Based on the field investigation on Yushu, Jiutai and Yongji in Jilin Province, relevant data of HDI dimensional indices are collected. According to the comprehensive evaluation method based on entropy weight, sustainable development levels of the three typical rural areas in Jilin Province are evaluated. Result shows that the...
Tipo: Thesis or Dissertation
Palavras-chave: Human development index (HDI); Rural area; Sustainable development; Entropy weight; China; Community/Rural/Urban Development; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/54036

Concession Bidding Rules and Investment Time Flexibility
Provedor de dados: 31
Autores: Dosi,   Cesare; Moretto,   Michele.
We study the competition to operate an infrastructure service by developing a model where firms must report a two-dimensional sealed bid: the price to consumers and the concession fee paid to the government. Two bidding rules are considered in this paper. One rule consists of awarding the concession to the firm that reports the lowest price. The other consists of granting the franchise to the bidder offering the highest fee. We compare the outcome of these rules with reference to two alternative concession arrangements. The former imposes the obligation to immediately undertake the investment required to roll-out the service. The latter allows the concessionaire to optimally decide the investment timing. The focus is on the effect of bidding rules and...
Tipo: Conference Paper or Presentation
Palavras-chave: Concessions; Auctions; Bidding Rules; Managerial Flexibility; Research Methods/ Statistical Methods; L51; D44; D92.
Ano: 2006
URL: http://purl.umn.edu/6630

ESTIMATION OF EFFICIENT REGRESSION MODELS FOR APPLIED AGRICULTURAL ECONOMICS RESEARCH
Provedor de dados: 31
Autores: Ramirez,   Octavio A.; Misra,   Sukant K.; Nelson,   Jeannie.
This paper proposes and explores the use of a partially adaptive estimation technique to improve the reliability of the inferences made from multiple regression models when the dependent variable is not normally distributed. The relevance of this technique for agricultural economics research is evaluated through Monte Carlo simulation and two mainstream applications: A time-series analysis of agricultural commodity prices and an empirical model of the West Texas cotton basis.  It is concluded that, given non-normality, this technique can substantially reduce the magnitude of the standard errors of the slope parameter estimators in relation to OLS, GLS and other least squares based estimation procedures, in practice, allowing for more precise inferences...
Tipo: Conference Paper or Presentation
Palavras-chave: Efficient regression models; Partially adaptive estimation; Non-normality; Skewness; Heteroskedasticity; Autocorrelation.; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19904

INCORPORATING SEASONALITY, PRODUCT VOLUME, AND SHILLER LAGS INTO A PRICE LINKAGE MODEL
Provedor de dados: 31
Autores: Parrott,   Scott D.; Eastwood,   David B.
The price transmission model is extended by incorporating seasonality and Shiller lags.  Symmetry is evaluated for the length of the adjustment as well as the amount.  Retail/shipping point tomato prices are used to test the model.  Transmission elasticities are estimated.  Results suggest this market is efficient.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20837

Comparative analysis of micro-regions in the northern Great Plain Region
Provedor de dados: 31
Autores: Kiraly,   Zsolt; Szmolka,   Andrea.
Our short paper examines the region of the Northern Great Plain, mainly due to its disadvantaged situation. Comparative analysis of the micro-regions in this particular region was implemented to identify possible causes for differentiation between the micro-regions. Finding these causes would then help us find more effective ways to address regional inequalities, currently one of the central issues not only in Hungary but throughout Eastern Europe. The methods used for such analysis included statistical indicators, such as difference in migration rates, rate of unemployment, number of incorporated enterprises per 1000 inhabitants etc., as well as the principal component analysis and the currently applicable categorisation system for micro-regions. The...
Tipo: Journal Article
Palavras-chave: Regional differences; Micro-region; Principal component analysis; Területi különbségek; Kistérség; Főkomponens analízis; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/92539

WHY ECONOMISTS SHOULD TALK TO SCIENTISTS AND WHAT THEY SHOULD ASK: DISCUSSION
Provedor de dados: 31
Autores: Musser,   Wesley N.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/15531

Stata tip 5: Ensuring programs preserve dataset sort order
Provedor de dados: 31
Autores: Newson,   Roger.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116217

Mixed Tournaments, Common Shocks, and Disincentives: An Experimental Study
Provedor de dados: 31
Autores: Wu,   Steven Y.; Roe,   Brian E.; Sporleder,   Thomas L.
Two well-known hypotheses from the literature on tournaments are that (1) tournaments can filter out common shocks thereby reducing agents’ risk exposure; and (2) disincentive effects can arise when a tournament scheme is administered on a group of mixed ability agents.  While handicapping and/or the creation of homogeneous groups have been suggested as mechanisms for mitigating disincentive effects, it is often impractical to use handicapping schemes and nearly impossible to create a completely homogeneous labor force.  Hence, contract administrators who intend to use tournaments to elicit effort must be able to assess the positive effects of tournaments (eliminate common shocks) against the negative effects (disincentive effects).  Using economic...
Tipo: Conference Paper or Presentation
Palavras-chave: Mixed tournaments; Incentives; Relative performance contracts; Experimental economics; Research Methods/ Statistical Methods; C91 D01; D81; D82; D86.
Ano: 2007
URL: http://purl.umn.edu/9703

AN INTRODUCTION TO ITERATIVE METHODS FOR SOLVING SIMULTANEOUS EQUATION MODELS: ILLUSTRATIONS FROM ECONOMICS
Provedor de dados: 31
Autores: Todd,   Richard; Roe,   Terry L.
This paper focuses on the application of computer-based, iterative methods for deriving analytical solutions to economic models expressed as systems of simultaneous linear and/or nonlinear equations. Practical suggestions for using four specific methods are emphasized. Analogies form economics are used to explain practical and theoretical points.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/13915

CAP IMPACTS ON LABOUR USE IN EAST GERMAN AGRICULTURE
Provedor de dados: 31
Autores: Petrick,   Martin; Zier,   Patrick.
D2_2
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural employment; Dynamic panel data models; Common Agricultural Policy; East Germany; Agricultural and Food Policy; Community/Rural/Urban Development; Research Methods/ Statistical Methods; Q18; J43; C23.
Ano: 2010
URL: http://purl.umn.edu/93962

Naturalness and Consumer Choices: The Case of Microfiltered Milk
Provedor de dados: 31
Autores: Coppola,   Adele; Verneau,   Fabio.
Food is a very sensitive area and the most intimate form of consumption. Consumer choice is known to be strongly affected by emotional factors usually not taken into account in economic analysis. At the same time it is clear that such emotional factors can affect consumer behaviour and market reactions above all when there are scandals and concerns. One of the emotional aspects that seems to dominate consumer behaviour in the food sector is so‐called magical thinking which leans on two different pillars: the contagion principle and the similarity principle. The contagion principle affects the concept of naturalness which, according to cognitive psychologists, is a key factor in determining consumer preferences. The main element stemming from this...
Tipo: Conference Paper or Presentation
Palavras-chave: Food technology; Consumer perception; Contagion principle; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100468

Optimal Conservation Policy Under Imperfect Intergenerational Altruism
Provedor de dados: 31
Autores: Di Corato,   Luca.
In this paper we study the optimal forest conservation policy by a hyperbolically discounting society. Society comprises a series of non-overlapping imperfectly altruistic generations each represented by its own government. Under uncertainty about future pay-offs we determine, as solution of an intergenerational dynamic game, the optimal timing of irreversible harvest. Earlier harvest occurs and the option value attached to the forest clearing decision is eroded under both the assumptions of naïve and sophisticated belief about future time-preferences. This results in a bias toward the current generation gratification which affects the intergenerational allocation of benefits and costs from harvesting and conserving a natural forest.
Tipo: Working Paper
Palavras-chave: Imperfect Altruism; Real Options; Hyperbolic Discounting; Time Inconsistency; Natural Resources Management; Research Methods/ Statistical Methods; D81; C70; Q23; Q58.
Ano: 2011
URL: http://purl.umn.edu/120022

Ex-ante Policy Assessment from an Institutional Perspective. A Procedure for Institutional Compatibility Assessment (PICA)
Provedor de dados: 31
Autores: Theesfeld,   Insa; Schleyer,   Christian; Callois,   Jean-Marc; Aznar,   Olivier.
Ex-ante impact assessment of agricultural, environmental, and rural policies has become an integral part of political decision making processes in the EU. While there is a large variety of agri-environmental modelling tools available to analyse likely social, economic, and environmental impacts of these policies, scientifically well-founded ex-ante policy assessment tools capturing institutional dimensions are still missing. In this paper, we introduce a formalised procedure for modelling – ex-ante – institutional aspects for policy implementation: the ‘Procedure for Institutional Compatibility Assessment’ (PICA). It has recently been developed within the SEAMLESS project as a component of an integrative modelling framework for ex-ante assessment of policy...
Tipo: Working or Discussion Paper
Palavras-chave: Ex-ante Policy Assessment; Institutional Policy Assessment; Agricultural and Food Policy; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; B49; D78; Q18.
Ano: 2008
URL: http://purl.umn.edu/6112

A possible examination method for observing agriculture
Provedor de dados: 31
Autores: Nabradi,   Andras; Nagymihaly,   Kornelia Ficzere.
On the basis of our examinations we have come to the conclusion that longitudinal examinations are the simplest and most up-to-date methods as well as the most cost-efficient ones to follow the decision-making, preparatory data collecting, processing and analysing opportunities serving the sustainability of agriculture better and better together with tracing down the feedback about the decisions to see if the given measure has really resulted in reaching the objectives. The method was proved to be able to supply both micro-and macro-level information in the desired breakdown, groupings and systems of connections. The development successive (panel) examination that we applied can serve as the basis of making decisions affecting huge areas by means of total...
Tipo: Conference Paper or Presentation
Palavras-chave: Longitudinal examination; Method; Application; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/44188

INCREASES IN COSTS AND RETURNS DUE TO INTENSIFYING RANGE FORAGE PRODUCTION SURVEYS:  AN INFORMATION ECONOMIC ANALYSIS
Provedor de dados: 31
Autores: Rafsnider,   Giles T.; Skold,   Melvin D.; Driscoll,   Richard S.
The U.S. Congress and courts have directed federal natural resource agencies to use better information for management decisions than they have used in the past.  It is also important for these agencies to improve the efficiency of resource use where possible.  This information economics study estimates increased costs and revenues which can be directly imputed to improving the accuracy of range forage production surveys.  It suggests that a high level of survey accuracy may often be justifiable.
Tipo: Journal Article
Palavras-chave: Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 1983
URL: http://purl.umn.edu/32489

Dynamic Economic Relationships Among U.S. Soy Product Markets: Using a Cointegrated Vector Autoregression Approach with Directed Acyclic Graphs
Provedor de dados: 31
Autores: Babula,   Ronald A.; Bessler,   David A.; Rogowsky,   Robert A.
This paper applies a combined methodology of a recently developed directed acyclic graph (DAG) analysis with Johansen and Juselius' methods of the cointegrated vector autoregression (VAR) model to a monthly U.S. system of markets for soybeans, soy meal, and soy oil. Primarily a methods paper, Johansen and Juselius' procedures are applied, with a special focus on statistically addressing information inherent in well-known sources of non-normal data behavior to illustrate the effectiveness of modeling the system as a cointegrated multi-market system. Perhaps for the first time, methods of the cointegrated VAR model are combined with DAG analysis to account for contemporaneously correlated residuals, and are applied to this U.S. soy-based system. Analysis of...
Tipo: Working or Discussion Paper
Palavras-chave: Directed acyclic graphs; Cointegration; Vector error correction and vector autoregression models; Monthly U.S. soy-based markets.; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/15880

ECONOMIC IMPACTS OF THE FINANCIAL CRISIS ON THE KOREAN FARM AND NON-FARM SECTORS
Provedor de dados: 31
Autores: Han,   Doo Bong.
The objective of this study is to construct a macroeconomic model emphasizing agriculture and analyze the economic impacts of the financial crisis on the Korean farm and non-farm sectors. The simulation results show that financial shocks have great impacts on general economy and change the resource allocation within and between farm and non-farm sectors.
Tipo: Conference Paper or Presentation
Palavras-chave: Financial Crisis; Macroeconomic Model; Agricultural Finance; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21643

Further processing of estimation results: Basic programming with matrices
Provedor de dados: 31
Autores: Watson,   Ian.
Rather than process estimation results in other applications, such as spreadsheets, this article shows how easy it is to process them inside Stata by undertaking some basic programming with matrices. Spreadsheet visualization helps define the task, but the steps are all core Stata: macros, loops, and matrices. The programming challenge is only a modest one for novices, while the benefits of converting do-files into ado programs can be considerable.
Tipo: Journal Article
Palavras-chave: Matrices; Programming; Estimation results; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117501

Dynamic Programming, Activity Analysis and the Theory of the Firm
Provedor de dados: 31
Autores: Throsby,   C.D.
The role of dynamic programming as a means of examining the allocation and pricing problems in the theory of the firm is considered in this paper. The production relationships and equilibrium conditions as specified by neoclassical theory and linear programming are stated and dynamic programming formulations of each of these models are constructed and compared. It is demonstrated that dynamic programming adds nothing to established theory in these cases, providing simply an alternative means of computation which might be preferred for some empirical problems. It is concluded that some theoretical contribution may be possible by using dynamic programming to attack problems beyond the scope of conventional methods.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1968
URL: http://purl.umn.edu/9108

INCORPORATING QUADRATIC SCALE CURVES IN INVERSE DEMAND SYSTEMS
Provedor de dados: 31
Autores: Beach,   Robert H.; Holt,   Matthew T.
In this paper we introduce inverse demand systems that include quadratic scale terms.  These systems are similar to regular quadratic demand systems introduced by Howe, Pollack, and Wales.  A unique feature of these specifications is that they maintain linear scale curves as a special case.  For illustrative purposes we estimate the Normalized Quadratic Inverse Demand-Quadratic Scale System using monthly South Atlantic fish landings and valuation data, 1980-1996.  In estimation concavity is maintained locally, and the rank reduction procedures advocated by Diewert and Wales (1988b) are employed.  The estimated model is then used to obtain welfare estimates associated with catch restrictions.
Tipo: Conference Paper or Presentation
Palavras-chave: Antonelli matrix; Inverse demands; Negative semidefinite; Quadratic scale curves; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21579

Precio de la tierra con presión urbana: un modelo para España
Provedor de dados: 31
Autores: Decimavilla,   Esther; San Juan,   Carlos; Sperlich,   Stefan.
RESUMEN: Estudiamos el precio de la tierra para uso agrario y las variables que determinan su evolución en España, tratando de identificar qué parte de la subida de precios observada se justifica por elementos «internos», relacionados con la renta agraria esperada, y cuál proviene de elementos externos o especulativos, vinculados a cambios en el uso del suelo. Además se relaciona el ciclo de precios con la aceleración de la especialización en el ámbito regional y la integración en la PAC. La novedad de este trabajo consiste en identificar, mediante técnicas de datos de panel, factores no fundamentales (presión urbanizadora, creación de regadíos, cambio demográfico) que, además de los fundamentales (ingresos esperados y localización geográfica) determinan...
Tipo: Journal Article
Palavras-chave: Especialización regional; Especulación urbana; Datos de panel; Precios de la tierra; Productividad agraria; Urban pressure; Panel data; Land prices; Agricultural productivity; Regional specialization; Agribusiness; Agricultural and Food Policy; Community/Rural/Urban Development; Demand and Price Analysis; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Q15; R14; Q24; R52.
Ano: 2008
URL: http://purl.umn.edu/37186

DYNAMIC POSITIVE EQUILIBRIUM PROBLEM
Provedor de dados: 31
Autores: Paris,   Quirino.
The Dynamic Positive Equilibrium Problem (DPEP) is a methodology for dealing with time series about economic agents’ decisions, regardless of the amount of available information.  The approach is articulated in three phases, as in the static counterpart Symmetric Positive Equilibrium Problem (SPEP), with the variant that it must be preceded by the estimation of the equation of motion which characterizes a dynamic model. Furthermore, the definition of marginal cost in the DPEP model is different from the same notion in the static SPEP.  In this paper, the DPEP approach was applied to a panel data dealing with annual crops from California agriculture for a horizon of eight years.  The dynamic character of the DPEP model is based upon then assumption of...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/11956

INTRODUCCION A LA ESTADISTICA PARA ECONOMISTAS AGRICOLAS USANDO EL SPSS
Provedor de dados: 31
Autores: Swinton,   Scott M.; Labarta,   Ricardo A.
Este documento es un manual de estadística para economistas aplicados que usan el programa estadístico SPSS. Está diseñado para ser usado dentro de un taller de capacitación de una semana, y tiene como propósito familiarizar a profesionales de la investigación con procedimientos estadísticos básicos, necesarios para realizar análisis socioeconómicos a datos que provienen de encuestas. Este documento es una introducción para los usuarios en la creación y manipulación de las bases de datos, en la estadística exploratoria univariada y bivariada, en la prueba de hipótesis y en la regresión lineal y logística. El texto del documento se apoya en 19 cajas de texto que ilustran como cada procedimiento puede ser aplicado a un grupo de datos provenientes de una...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/11702

APPLYING FUZZY THEORY CONCEPTS TO THE ANALYSIS OF EMPLOYMENT DIVERSIFICATION OF FARM HOUSEHOLDS: METHODOLOGICAL CONSIDERATIONS
Provedor de dados: 31
Autores: Fritzsch,   Jana.
The Deliverable 7.2 (D7.2) of the SCARLED project provides methodological considerations for applying fuzzy set theory to the analysis of employment diversification of farm households. It presents a Mamdani's type fuzzy inference model and describes its application within the project's framework. The model consists of ten variables that are grouped into the four factors: (i) necessity to diversify, (ii) internal preconditions, (iii) external preconditions, and (iv) attitudes. The coherence of these four factors with the integrated framework for the analysis of nonfarm rural employment is discussed. The model will be realised in the Fuzzy Logic Toolbox from MATLAB®. Forty four membership functions and 138 rules are going to be implemented, tested, and...
Tipo: Working or Discussion Paper
Palavras-chave: International Development; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/91953

Approximation Properties and Estimation of the Translog Production Function with Panel Data
Provedor de dados: 31
Autores: Tzouvelekas,   Evaggelos.
This paper provides a general theoretical and methodological framework for the estimation of the translog production function using panel data. The estimation is carried out using generalised least squares estimator (random-effects model) under different maintained hypotheses for the underlying production technology. Our empirical results indicate that imposing a priori restrictions such as homotheticity, homogeneity or separability on the production structure are not palatable and should rather remain a testable hypothesis within the estimation framework.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/26412

Sensitivity of welfare effects estimated by equilibrium displacement model: a biological productivity growth for semi-subsistence crop in Sub-Sahara African market with high transactions costs
Provedor de dados: 31
Autores: Takeshima,   Hiroyuki.
This paper discusses the application of the equilibrium displacement model (EDM) to estimate ex-ante the welfare effects of biological productivity growth for semi-subsistence crop and its impact on poverty reduction. The conventionally used EDM is compared with an alternative model (alternative EDM) that reflects arguably more realistic assumptions for African semi-subsistence crops, such as the shape and shift of supply curve, significant margins due to high transportation costs between farmgate and consumption market, as well as between different consumption markets, and the degree of precisions of estimated structural parameters. The application to the dataset for Benin cassava farmers provides an example that the conventional EDM may significantly...
Tipo: Working or Discussion Paper
Palavras-chave: Equilibrium displacement model; Pivotal shift; Cassava; Semi-subsistence; Market margins; Double buffering; Agricultural and Food Policy; Consumer/Household Economics; Food Security and Poverty; International Development; Productivity Analysis; Research Methods/ Statistical Methods; C65; D13; D31; D60; Q11; Q12.
Ano: 2009
URL: http://purl.umn.edu/49287

Application of mean-Gini stochastic efficiency analysis
Provedor de dados: 31
Autores: McDonald,   Jeffrey D.; Moffitt,   L. Joe; Willis,   Cleve E.
This article adds to the information base concerning the applicability of mean- Gini stochastic efficiency analysis in agriculture. The mean-Gini efficient set of decisions is characterized rigorously in terms of its corresponding absolute risk aversion. In an empirical analysis, the mean-Gini efficient set of decisions is derived for four studies from the literature and compared to the second degree stochastic dominance efficient set. An alternative quantitative measure of risk aversion is used to gain insight in a visceral sense to the risk preferences associated with mean-Gini efficient decisions.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/118007

Centre Commissioned External Review (CCER) of the IWMI-TATA Water Policy Research Program.
Provedor de dados: 31
Autores: Burke,   Jacob J.; Joshi,   Deep; Chopra,   Ravi.
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural research; Research projects; Project appraisal; Financing; Institutional development; Evaluation; Water policy; Water management; Irrigation management; Groundwater; Agricultural and Food Policy; Agricultural Finance; Financial Economics; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/92021

CAP REFORM AND THE EFFECTS OF DIRECT PAYMENTS ON HETEROGENEOUS FARM STRUCTURES IN EAST GERMANY
Provedor de dados: 31
Autores: Zier,   Patrick; Petrick,   Martin.
B3_1
Tipo: Conference Paper or Presentation
Palavras-chave: Structural change; Dynamic panel data models; Common Agricultural Policy; East Germany; Agricultural and Food Policy; Farm Management; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93948

Spatial Externalities in Agriculture: Empirical Analysis, Statistical Identification, and Policy Implications
Provedor de dados: 31
Autores: Lewis,   David J.; Barham,   Bradford L.; Zimmerer,   Karl S.
Spatial externalities can affect economic welfare and landscape pattern by linking farm returns on adjoining parcels of land. While policy can be informed by research that documents spatial externalities, statistically quantifying the presence of externalities from landscape pattern is insufficient for policy guidance unless the underlying cause of the externality can be identified as positive or negative. This article provides a springboard for empirical research by examining the underlying structure, social-environmental interactions, and statistical identification strategies for the analysis and quantification of agricultural spatial externalities that are derived from observations of landscape change. The potential for original policy treatments of...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/92151

Pricing and Vertical Organization of Differentiated Products
Provedor de dados: 31
Autores: Shi,   Guanming; Chavas,   Jean-Paul.
This paper investigates differentiated product pricing and vertical organization under imperfect competition. We develop a conceptual model of multiproduct pricing to examine how the exercise of market power varies with substitution/complementarity relationships among products and vertical structures. The analysis is applied to US soybean seed pricing during the period between 2000 and 2007. It considers two vertical structures: Vertical integration and licensing. We find evidence that vertical organization has significant effects on prices. These effects vary depending on the institutional setup and the bundling of genetic material. The empirical evidence shows that, in a multi-market context, complementarity and economies of scope can mitigate the price...
Tipo: Working or Discussion Paper
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/92228

AIDS VERSUS THE ROTTERDAM DEMAND SYSTEM:  A COX TEST WITH PARAMETRIC BOOTSTRAP
Provedor de dados: 31
Autores: Dameus,   Alix; Richter,   Francisca G.-C.; Brorsen,   B. Wade; Sukhdial,   Kullapapruk Piewthongngam.
A Cox test with parametric bootstrap is developed to select between the linearized version of the First-Difference Almost Ideal Demand System (FDAIDS) and the Rotterdam model.  A Cox test with parametric bootstrap has been shown to be more powerful than encompassing tests like those used in past research.  The bootstrap approach is used with U.S. meat demand (beef, pork, chicken, fish) and compared to results obtained with an encompassing test.  The Cox test with parametric bootstrap consistently indicates the Rotterdam model is preferred to the FDAIDS, while the encompassing test sometimes fails to reject FDAIDS.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/31126

A Minimum Power Divergence Class of CDFs and Estimators for Binary Choice Models
Provedor de dados: 31
Autores: Mittelhammer,   Ronald C.; Judge,   George G.
The Cressie-Read (CR) family of power divergence measures is used to identify a new class of statistical models and estimators for competing explanations of the data in binary choice models. A large flexible class of cumulative distribution functions and associated probability density functions emerge that subsumes the conventional logit model, and forms the basis for a large set of estimation alternatives to traditional logit and probit methods. Asymptotic properties of estimators are identified, and sampling experiments are used to provide a basis for gauging the finite sample performance of the estimators in this new class of statistical models.
Tipo: Working or Discussion Paper
Palavras-chave: Binary choice models and estimators; Conditional moment equations; Squared error loss; Cressie-Read statistic; Information theoretic methods; Minimum power divergence; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/37759

Estimating Mixed Logit Recreation Demand Models With Large Choice Sets
Provedor de dados: 31
Autores: Domanski,   Adam.
Discrete choice models are widely used in studies of recreation demand.  They have proven valuable when modeling situations where decision makers face large choice sets and site substitution is important.  However, when the choice set faced by the individual becomes very large (on the order of hundreds or thousands of alternatives), computational limitations make estimation with the full choice set intractable.  Sampling of alternatives in a conditional logit framework is an effective method to limit computational burdens while still producing consistent estimates.  This method is allowed by the existence of the independence of irrelevant alternatives (IIA) assumption.  More advanced mixed logit models account for unobserved preference heterogeneity and...
Tipo: Conference Paper or Presentation
Palavras-chave: Sampling of alternatives; Discrete choice; Mixed logit; Conditional logit; Recreational demand; Wisconsin; Fishing; Microeconometrics; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49413

Controlling in the Conditions of Czech Republic
Provedor de dados: 31
Autores: Chrenkova,   Iveta.
The paper deals with the issue of controlling the Agriculture of the Czech Republic, using methods of activity-based costing. The basic premise of knowledge is based on a given topic, especially the nature of the method ABC (Activity Based Costing). The paper described the application of the ABC design method in Microsoft Excel applicable in the agricultural sector of the Czech Republic. The proposed application of the ABC method, using Microsoft Excel, is an alternative to using expensive costing ABC special software. Created ABC method application also demonstrates that if somebody wants to improve approach in the overheads management, so it can be used by using quite common user knowledge of Microsoft Excel.
Tipo: Journal Article
Palavras-chave: Controlling; Costs; Agriculture production; Activity based costing; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; GA; IN.
Ano: 2011
URL: http://purl.umn.edu/109734

ON TESTING FOR REVEALED PREFERENCE CONDITIONS
Provedor de dados: 31
Autores: Tsur,   Yacov.
A procedure to test for the significance of violations of revealed preference conditions is described.  The procedure is simple and hence may especially be appropriate for large data sets.  An application to consumption data is presented.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/14264

THE CHANGING RELATIONSHIP OF STATISTICAL DATA AND ANALYSIS
Provedor de dados: 31
Autores: Bonnen,   James T.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/11809

TRICHOTOMOUS CHOICE: A POSSIBLE SOLUTION TO DUAL RESPONSE OBJECTIVES IN DICHOTOMOUS CHOICE CONTINGENT VALUATION QUESTIONS
Provedor de dados: 31
Autores: Loomis,   John B.; Traynor,   Kerri; Brown,   Thomas C.
We investigate the possibility that some respondents to a dichotomous choice question vote YES, even though they would not pay the posted dollar amount in order to register support for the project or policy. A trichotomous choice question format is proposed to determine if allowing respondents the opportunity to vote in favor of a project at an amount less than their bid affects estimated willingness to pay. Using univariate and multivariate tests, we find the trichotomous choice question format reduces the number of YES responses and produces a statistically significant decrease in willingness to pay for an open-space program.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/30799

Efficiency and total factor productivity in post-EU accession Hungarian sugar beet production
Provedor de dados: 31
Autores: Fogarasi,   Jozsef.
This paper analyses efficiency and total factor productivity (TFP) in Hungarian sugar beet production applying non-parametric frontier techniques. For 2004 and 2005 efficiency and TFP are calculated by Data Envelopment Analysis (DEA) and by a Malmquist index respectively. Between 2004 and 2005 the average technical efficiency was very stable, around 0.80 for CRS efficiency and 0.87 for VRS efficiency, suggesting that in both years farms were similarly clustered towards the frontier. The analysis of returns to scale reveals that during both years half (48%) of the sugar beet growers were operating under increasing returns to scale. In the two analysed years changes occurred between decreasing returns to scale and scale efficient farms, when the first...
Tipo: Journal Article
Palavras-chave: Efficiency; TFP; Data Envelopment Analysis; Sugar beet production; FADN.; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/107653

Another Note on the Use of a Logarithmic Time Trend
Provedor de dados: 31
Autores: Ho-Trieu,   Luan Ngoc; Tucker,   Jim.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/12288

Nonlinear Properties of Multifactor Financial Models
Provedor de dados: 31
Autores: Chen,   Kim Heng; Jandhyala,   Venkata K.; Fotopoulos,   Stergios B.
This paper provides a comprehensive analysis of the nonlinear properties of multifactor pricing models. Beginning with the generalized geometric Brownian motion, we develop a method whereby the log returns of a set of d-assets or portfolios admit a scale mixture model. This is followed by an analytical study on the conditional behavior of a subset of assets given another subset. Expressions for the first two conditional moments are provided under the scale mixture family. The regression equation when the scaling variable is constant (unity) corresponds with the renowned APT. Computable conditional moment expressions for the scaling variable are derived under both inverse gamma and gamma distributions. These moment equations are nonlinear in parameters,...
Tipo: Journal Article
Palavras-chave: Generalized Geometric Brownian Motion; Heteroskedasticity; Scale Mixture of Normal Distributions; Research Methods/ Statistical Methods; C31; C44; G12.
Ano: 2005
URL: http://purl.umn.edu/49157

Globally Flexible Modeling of County-Level Acreage Response for Primary U.S. Field Crops
Provedor de dados: 31
Autores: Cooper,   Joseph C.; Arnade,   Carlos Anthony.
This study takes the standard acreage response model that stems from an expected utility framework, accounting for both price and yield variability, and nests it within a flexible semi-nonparametric (SNP) model consistent with farm-level decision models for computationally tractable results. We use county-level data to estimate the response of farmers’ planting preferences to changes in revenue and other variables.
Tipo: Conference Paper or Presentation
Palavras-chave: Acreage response; Elasticities; Field crops; Semi-nonparametric; Risk; Agricultural and Food Policy; Crop Production/Industries; Farm Management; Land Economics/Use; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/103240

DEALING WITH HEALTH CONCERNS IN NATURAL RESOURCE DAMAGE ASSESSMENT
Provedor de dados: 31
Autores: Hite,   Diane; Hoehn,   John P.; Randall,   Alan.
We employ a combination of survey design and econometric techniques to explore ways to deal with health concerns in restoration projects where environmental injuries are severe.  We use data from a referendum contingent valuation  survey for a natural resource restoration project to demonstrate the extent to which health concerns can be controlled.
Tipo: Conference Paper or Presentation
Palavras-chave: Contingent valuation; Environmental economics; Research methods; Econometrics; Statistics; Environmental Economics and Policy; Health Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21652

THE ROLE OF CURVATURE IN ESTIMATING ACCURATE DUAL FUNCTIONS
Provedor de dados: 31
Autores: Tauer,   Loren W.
A production function highly concave in inputs will have a dual profit function less convex in prices.  Even large variations in prices will cause little variation in input usage and output, resulting in poor profit function estimates.  This is demonstrated using Monte Carlo simulation with various curvatures and error structures.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/14752

Police-powers, regulatory takings and the efficient compensation of domestic and foreign investors
Provedor de dados: 31
Autores: Aisbett,   Emma; Karp,   Larry S.; McAusland,   Carol.
In customary international and public law, “takings” resulting from regulations designed to protect the public good are generally excluded from compensation rules; this exclusion is known as a police powers carve-out (PPCO). Increasingly, this PPCO is being challenged, particularly in international investment law. This paper analyzes the efficiency properties of a PPCO in a model with endogenous regulation, investment and entry. We design a one-parameter family of carve-out/compensation schemes that induce efficient regulation and firm level investment even when the regulator suffers fiscal illusion and the social benefit from regulation is private information to the regulator. We show that offering a carve-out reduces the subsidy to risky industry...
Tipo: Working or Discussion Paper
Palavras-chave: Regulatory takings; Expropriation; Environment; Foreign direct investment; NAFTA; Environmental Economics and Policy; Research Methods/ Statistical Methods; F21; H4; K3; Q58.
Ano: 2008
URL: http://purl.umn.edu/42842

PARAMETRIC MODELING AND SIMULATION OF JOINT PRICE-PRODUCTION DISTRIBUTIONS UNDER NON-NORMALITY, AUTOCORRELATION AND HETEROSCEDASTICITY: A TOOL FOR ASSESSING RISK IN AGRICULTURE
Provedor de dados: 31
Autores: Ramirez,   Octavio A.
This study presents a way to parametrically model and simulate multivariate distributions under potential non-normality, autocorrelation and heteroscedasticity and illustrates its application to agricultural risk analysis. Specifically, the joint probability distribution (pdf) for West Texas irrigated cotton, corn, sorghum, and wheat production and prices is estimated and applied to evaluate the changes in the risk and returns of agricultural production in the region resulting from observed and predicted price and production trends. The estimated pdf allows for time trends on the mean and the variance and varying degrees of autocorrelation and non-normality (kurtosis and right- or left-skewness) in each of the price and production variables. It also allows...
Tipo: Journal Article
Palavras-chave: Agricultural risk analysis; Autocorrelation; Heteroscedasticity; Multivariate non-normal simulation; West Texas agriculture; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/15486

Consumer Purchasing Behavior in Response to Media Coverage of Avian Influenza
Provedor de dados: 31
Autores: Beach,   Robert H.; Zhen,   Chen.
Understanding consumer response to food safety information is important for quantifying consumer response to food safety events, predicting market impacts, and developing appropriate risk communication strategies. In this study, we present a methodology for analysis of consumer response to media coverage of avian influenza and an application using Italian data.
Tipo: Conference Paper or Presentation
Palavras-chave: Avian influenza; Food safety; Italy; Meat demand; Media index; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; Q11; Q18.
Ano: 2008
URL: http://purl.umn.edu/6750

Nonlinearities in the World Vegetable Oil Price System: El Nino Effects
Provedor de dados: 31
Autores: Ubilava,   David; Holt,   Matthew T.
In this research we estimate the effect of El Nino Southern Oscillation (ENSO) over time on market dynamics for eight major vegetable oil prices. We estimate a system for vegetable oil prices by using a smooth transition vector error correction model (STVECM) to analyze impacts of ENSO events on production, and, more interestingly, their asymmetric nature. The results of estimated Exponential STVECM and Quadratic STAR models, respectively for the system of oil price equations and the ENSO variable regressions, suggest a smooth transition between ENSO regimes, and provide a better overall fit to the data than do linear models. Effects of the ENSO shock are analyzed using generalized impulse-response functions (GIRFs). The non-linear nature of these shocks...
Tipo: Conference Paper or Presentation
Palavras-chave: Smooth Transition; Vector Error Correction; El Nino Southern Oscillation; Vegetable Oil Prices; Demand and Price Analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49360

DIMINISHING MARGINAL VALUE
Provedor de dados: 31
Autores: Horowitz,   John K.; List,   John A.; McConnell,   Kenneth E.
The notion of diminishing marginal value has had a profound impact on the development of neoclassical theory.  Early neoclassical scholars had considerable difficulty convincing contemporaries of the new paradigm's value until political economists, including Jevons and Walras, used the critical assumption of diminishing marginal value to link utility and demand. While diminishing marginal value remains a key component of modern economic intuition, there is surprisingly little empirical verification of its existence or level. This paper gathers field data across a myriad of subject pools--from undergraduate students to PTA members to sportscard enthusiasts--to examine several aspects of preferences in both price and exchange institutions. Examining behavior...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20297

An Integrated Package for Linear Programming
Provedor de dados: 31
Autores: Pannell,   David J.
Batterham (1987) described a computer program which eases entry of mathematical programming data. Users of the program first use a text editor to enter data in a relatively efficient format, which the program then converts into MPS format as required by most mathematical programming solution programs. Alternatively the program can read and convert data from a microcomputer spreadsheet data file.  This note is a description of a microcomputer program which has advantages over each of these procedures. The program, GULP (General, User friendly Linear Programming), is an integrated package of procedures for data entry, matrix printing and model solution. GULP has particular advantages for education and has been used in a number of courses in Western Australia.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/12569

Stata tip 44: Get a handle on your sample
Provedor de dados: 31
Autores: Jann,   Ben.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119274

Modelling Complex Systems
Provedor de dados: 31
Autores: Xepapadeas,   Anastasios.
Empirical observations suggest that linear dynamics are not an adequate representa- tion of ecological systems and that a realistic representation would require adoption of complex nonlinear dynamical systems with characteristics encountered in complex adaptive systems (CAS). Adequate modelling should include and combine, among others, strategic interactions among economic agents, nonconvexities induced by non-linear feedbacks, separate spatial and temporal scales and modeling of spatiotempo- ral dynamics, and allowance of alternative time scales. Ignoring these characteristics might obscure very important features that we observe in reality such as bifurcations and irreversibilities or hysteresis. As a consequence, the design of policies that do not take...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53216

Improved generalized estimating equation analysis via xtqls for quasi–least squares in Stata
Provedor de dados: 31
Autores: Shults,   Justine; Ratcliffe,   Sarah J.; Leonard,   Mary.
Quasi–least squares (QLS) is an alternative method for estimating the correlation parameters within the framework of the generalized estimating equation (GEE) approach for analyzing correlated cross-sectional and longitudinal data. This article summarizes the development of QLS that occurred in several reports and describes its use with the user-written program xtqls in Stata. Also, it demonstrates the following advantages of QLS: (1) QLS allows some correlation structures that have not yet been implemented in the framework of GEE, (2) QLS can be applied as an alternative to GEE if the GEE estimate is infeasible, and (3) QLS uses the same estimating equation for estimation of Β as GEE; as a result, QLS can involve programs already available for GEE. In...
Tipo: Article
Palavras-chave: Xtqls; Correlated data; Clustered data; Longitudinal data; Generalized estimating equations; Quasi–least squares; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119265

Modelling Regional Agricultural Output Adjustments in Scotland in Response to CAP Reform
Provedor de dados: 31
Autores: Revoredo-Giha,   Cesar; Leat,   Philip M.K.; Milne,   Catherine E.
The purpose of the paper is to present an agricultural supply model for Scotland used to estimate regional changes in agricultural outputs due to the 2003 Common Agricultural Policy (CAP) reform. Supply functions were estimated for several farm types based on generalised trans-logarithmic multiproduct cost functions (Caves, Christensen and Tretheway, 1981). The data used for the estimation were an unbalanced panel dataset constructed using farm level data from the Scottish Executive’s Farm Accounts Scheme (FAS) survey. Using the estimated supply adjustments, individual farm level responses to subsidy and price changes were aggregated using agricultural census weights to estimate the output changes for different regions.
Tipo: Conference Paper or Presentation
Palavras-chave: Regional models; CAP reform; Agricultural production econometrics; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6599

ZUM DESINVESTITIONSVERHALTEN LANDWIRTSCHAFTLICHER UNTERNEHMER: ERGEBNISSE EINER EXPERIMENTELLEN UNTERSUCHUNG
Provedor de dados: 31
Autores: Maart,   Syster Christin; Musshoff,   Oliver; Odening,   Martin; Schade,   Christian.
B1_3
Tipo: Conference Paper or Presentation
Palavras-chave: Desinvestition; Realoptionsansatz; Experimentelle Ökonomik; Agricultural Finance; Farm Management; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93943

Disproving Causal Relationships Using Observational Data
Provedor de dados: 31
Autores: Bryant,   Henry L.; Bessler,   David A.; Haigh,   Michael S.
Economic theory is replete with causal hypotheses that are scarcely tested because economists are generally constrained to work with observational data.  This article describes the use of causal inference methods for testing a hypothesis that one random variable causes another.  Contingent on a sufficiently strong correspondence between the hypothesized cause and effect, an appropriately related third variable can be employed for such a test.  The procedure is intuitive, and is easy to implement.  The basic logic of the procedure naturally suggests strong and weak grounds for rejecting the hypothesized causal relationship.  Monte Carlo results suggest that weakly-grounded rejections are unreliable for small samples, but reasonably reliable for large...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21166

A Spatial Hedonic Model with Time-Varying Parameters: A New Method Using Flexible Least Squares
Provedor de dados: 31
Autores: Kuethe,   Todd H.; Foster,   Kenneth A.; Florax,   Raymond J.G.M.
The following paper outlines a new econometric model designed to capture both the temporal and spatial dynamics of housing prices. The paper combines existing spatial econometric techniques with a model that allows parameters to evolve over time. In addition, we provide an empirical application to the price effects of confined animal feeding operations to a data set of residential real estate in Tippecanoe County, Indiana from 1993 through 2006.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6306

THE USE OF CROSS-SECTIONAL ESTIMATES OF PROFIT FUNCTIONS FOR TESTS OF RELATIVE EFFICIENCY: A CRITICAL REVIEW
Provedor de dados: 31
Autores: Quiggin,   John C.; Bui-Lan,   Anh.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/22591

Assessing Recent Trends in Pesticide Use in U.S. Agriculture
Provedor de dados: 31
Autores: Fernandez-Cornejo,   Jorge; Nehring,   Richard F.; Newcomb Sinha,   Elizabeth; Grube,   Arthur; Vialou,   Alexandre.
Replaced with revised version of paper 04/20/10.
Tipo: Conference Paper or Presentation
Palavras-chave: Pesticides; Herbicides; Insecticides; Hedonic models; Genetically engineered crops; Corn; Soybeans; Cotton; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49271

Estimation and testing of fixed-effect panel-data systems
Provedor de dados: 31
Autores: Blackwell,   J. Lloyd, III.
This paper describes how to specify, estimate, and test multiple-equation, fixed-effect, panel-data equations in Stata. By specifying the system of equations as seemingly unrelated regressions, Stata panel-data procedures worked seamlessly for estimation and testing of individual variable coefficients, but additional routines using test were needed for testing of individual equations and differences between equations.
Tipo: Journal Article
Palavras-chave: Panel data; Fixed effect; Multiple equations; Seemingly unrelated regressions; Heteroskedasticity; Autocorrelation; Contemporaneous correlation; Tests of linear combinations; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117512

Testing the Order of Integration with Low Power Tests. An Application to Argentine Macro-variables
Provedor de dados: 31
Autores: Carrera,   Jorge Eduardo; Feliz,   Mariano; Panigo,   Demian.
The low power of available econometric tests is an important problem in applied research on unit roots and related issues. Based on the principle of methodological triangulation, the problem should be analyzed from different points of view in order to increase the validity of the results. Following this approach a strategy to test the order of integration in time series is presented using a sequence of eleven consolidated tests. In this way it is possible to determine the persistence of shocks, to specify the best strategy for trend-cycle decomposition and to obtain additional information useful for public policies. As an application of the methodology, the integration properties in the main 14 Argentine macroeconomic variables are studied. A...
Tipo: Journal Article
Palavras-chave: Unit root; Persistence; Cycles; Structural breaks; Argentine macroeconomic variables; Research Methods/ Statistical Methods; C3; C5; E3.
Ano: 2003
URL: http://purl.umn.edu/43989

Multivariate Statistical Techniques
Provedor de dados: 31
Autores: Pauw,   Kalie.
This paper serves as an overview of various multivariate statistical techniques that can be used to analyse and describe survey datasets. Such analyses are useful for gaining a better understanding of results and the interpretation thereof. In particular this paper evaluates some of the standard statistical techniques that can be used to analyse consumption patterns of households, both in terms of expenditure on individual goods or baskets of goods. The ultimate aim is to determine whether these techniques – e.g. multivariate tests of significance and cluster analysis techniques – can be successfully employed to assist in forming representative household groups in terms of expenditure patterns. As such this paper is exploratory and does not aim to obtain...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/15613

ANALYSIS OF THE EFFECTS OF ENVIRONMENTAL REGULATION ON PULP AND PAPER INDUSTRY STRUCTURE
Provedor de dados: 31
Autores: Gomez,   Irma A.; Love,   H. Alan; Burton,   Diana M.
Environmental regulations are hypothesized to have an impact on industry structure in manufacturing industries.  A nonstationary Markov chain analysis shows that the capital expenditures required to meet environmental regulations is a statistically significant variable explaining increasing concentration of production capacity in the pulp and paper industry.
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20938

Speaking Stata: On structure and shape: the case of multiple responses
Provedor de dados: 31
Autores: Cox,   Nicholas J.; Kohler,   Ulrich.
A frequent problem in data management is that datasets may not arrive in the best structure for many analyses, so that it may be necessary to restructure the data in some way. The particular case of multiple response data is discussed at length, with special attention to different possible structures; the generation of new variables holding the data in different form; valuable inbuilt string and egen functions; using foreach and forvalues to loop over lists; and the use of the reshape command. Tabulations and graphics for such data are also reviewed briefly.
Tipo: Journal Article
Palavras-chave: Composite variables; Concatenation; Egen; Foreach; Forvalues; Graphics; Indicator variables; Multiple responses; Reshape; Split; String functions; Tabulations; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116035

On the Map
Provedor de dados: 31
Autores: Parker,   Timothy S.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/124223

The Impact of the European Enlargement and Common Agricultural Policy Reforms on Agricultural Markets: Much Ado about Nothing?
Provedor de dados: 31
Autores: Fabiosa,   Jacinto F.; Beghin,   John C.; Dong,   Fengxia; Elobeid,   Amani E.; Fuller,   Frank H.; Matthey,   Holger; Tokgoz,   Simla; Wailes,   Eric J.
Following a historical agreement on the EU enlargement, 10 new member states (NMS) acceded to the European Union on May 1, 2004. Although the European Union has expanded its membership in the past, this enlargement is unique in terms of its scope and diversity of the countries, area, and population involved. Thus, the effects of the EU enlargement on current and future member countries and on world commodity markets require careful consideration as the European Union is a major player in these markets. We analyze the effects of the Common Agricultural Policy (CAP) reform and enlargement on the EU-15, the NMS, and world agricultural markets. We compare three 10-year comprehensive agricultural outlook scenarios. In a "pre-enlargement" scenario, all...
Tipo: Working or Discussion Paper
Palavras-chave: CAP reform; Common Agricultural Policy; EU enlargement; European agriculture; New Member States; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/18393

EXISTENCE OF UNIQUE LIMITING PROBABILITY VECTORS IN STOCHASTIC PROCESSES WITH MULTIPLE TRANSITION MATRICES
Provedor de dados: 31
Autores: Mjelde,   James W.; Harris,   Wesley D.; Conner,   J. Richard; Schnitkey,   Gary D.; Glover,   Michael K.; Garoian,   Lee.
Concepts associated with stochastic process containing multiple transition matricies are discussed. It is proved that under certain conditions, a process with m transition matrices has m unique limiting probability vectors. This result extends the notion of discrete Markov processes to problems with intrayear and interyear dynamics. An example using a large DP model illustrates the usefulness of the concepts developed to applied problems.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/30939

Tests for unbalanced error-components models under local misspecification
Provedor de dados: 31
Autores: Sosa-Escudero,   Walter; Bera,   Anil K.
This paper derives unbalanced versions of the test statistics for firstorder serial correlation and random individual effects summarized in Sosa-Escudero and Bera (2001, Stata Technical Bulletin Reprints, vol. 10, pp. 307–311), and updates their xttest1 routine. The derived test statistics should be useful for applied researchers faced with the increasing availability of panel information where not every individual or country is observed for the full time span. The test statistics proposed here are based on ordinary least-squares residuals and hence are computationally very simple.
Tipo: Article
Palavras-chave: Xttest1; Error-components model; Unbalanced panel data; Testing; Misspecification; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120929

Trust in the US‐EU Fruit and Vegetable Chain: Do US Exporters Understand EU Importers?
Provedor de dados: 31
Autores: Ameseder,   Christoph; House,   Lisa; Haas,   Rainer; Meixner,   Oliver; Fritz,   Melanie; Dahl,   Ellie; Hofstede,   Gert Jan.
Research on organizational and inter‐organizational trust has become an important field in management and marketing literature, as it is perceived as a pivotal aspect of business transactions. However, clarifications are still needed on the issue of whom we trust; is the person whom we are trading with trusted, or the organization, or just the product‐quality? Not only has this question not been answered within this field of research, neither have cultural differences have been described to any great extent. Additionally, if the perceived factors important to establish trusting relationships may or may not be the same on the buyers and the sellers side in international business transaction in food chains. The primary objective of this research study...
Tipo: Conference Paper or Presentation
Palavras-chave: Trust; Perceived trust; Importance of trust factors business transaction; Supply chain; Fruit and vegetable; US; EU; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100473

ECONOMIC AND ENVIRONMENTAL IMPACTS OF THE POST-1992 CAP REFORMS ON ALENTEJO ECONOMY OF PORTUGAL
Provedor de dados: 31
Autores: Serrao,   Amilcar.
This research develops 'Johansen-type' models of agriculture and constructs  Input-Output models for assessing the impact of the post-1992 CAP reforms on incomes, employment and the environment in four Alentejo study areas of Portugal. The effects of agricultural output changes on businesses supplying inputs and processing farm output  were also assessed by those empirical models.
Tipo: Conference Paper or Presentation
Palavras-chave: Common    Agricultural    Policy; Johansen   Model; Input-Output  Model; Elasticity; Multiplier and   Environmental Indicators; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/21020

Breaking Trends and the Prebisch-Singer Hypothesis: A Further Investigation
Provedor de dados: 31
Autores: Ghoshray,   Atanu; Kejriwal,   Mohitosh; Wohar,   Mark E.
This paper examines the Prebisch-Singer Hypothesis employing new time se- ries procedures that are robust to the nature of persistence in the commodity price shocks, thereby obviating the need for unit root pretesting. Speci…cally, the proce- dures allow consistent estimation of the number of structural breaks in the trend function as well as facilitate the distinction between trend breaks and pure level shifts. In comparison with past studies, we …nd fewer cases of commodities that display negative trends thereby weakening the case for the Prebisch-Singer Hypoth- esis. Finally, a new set of powerful unit root tests allowing for structural breaks under both the null and alternative hypotheses is applied to determine whether the underlying commodity price...
Tipo: Presentation
Palavras-chave: Primary commodity prices; Structural breaks; Trend functions; Prebisch- Singer Hypothesis; Unit roots; Demand and Price Analysis; Marketing; Research Methods/ Statistical Methods; 013; C22.
Ano: 2011
URL: http://purl.umn.edu/120387

PROJECT APPRAISAL, A BIBLIOGRAPHIC REVIEW
Provedor de dados: 31
Autores: Estefanell,   Gonzalo.
Project evaluation or project appraisal has experienced a growing interest from both scholars and practitioners in recent years, particularly after the Second World War.  This is attributed by Prest and Turvey to the growth of large investment projects and to the expanding role of government in the economic life of most countries.  Still more important is the increased interest in planning in developing countries, and the role played by the international financing institutions such as the Interamerican Development Bank, the World Bank, USAID, etc. These agencies, particularly the first two, have had a major impact on the advancement of applied work on project appraisal.  Several approaches to project appraisal have been developed from the activities of...
Tipo: Thesis or Dissertation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/11121

Optimal Length of Moving Average to Forecast Futures Basis
Provedor de dados: 31
Autores: Hatchett,   Robert B.; Brorsen,   B. Wade; Anderson,   Kim B.
Futures prices when combined with a basis forecast provide a reliable way to forecast cash prices. The most popular method of forecasting basis is historical moving averages. Given the recent failure of longer moving averages proposed by previous studies, this research reassesses past recommendations about the best length of moving average to use in forecasting basis. This research compares practical preharvest and storage period basis forecasts for hard wheat, soft wheat, corn and soybeans to identify the optimal amount of historical information to include in moving average forecasts. Only with preharvest hard wheat forecasts are the best moving averages longer than 3 years. The differences in forecast accuracy among the different moving averages are...
Tipo: Conference Paper or Presentation
Palavras-chave: Basis forecast; Grain; Law of One Price; Moving averages; Structural change; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Crop Production/Industries; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53048

The mixed-complementary approach to specifying agricultural supply in computable general equilibrium models
Provedor de dados: 31
Autores: Lofgren,   Hans; Robinson,   Sherman.
Caption title. "Draft, May 15, 1997." "August 1997"--Cover. Includes bibliographical references (leaf 12).
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural resources; Equilibrium (Economics) -- Mathematical models; Egypt; Computable General Equilibrium models; Agricultural mathematical programming models; Marketing; Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/97688

Impacts of irrigation on inland fisheries: Appraisals in Laos and Sri Lanka
Provedor de dados: 31
Autores: Nguyen-Khoa,   Sophie; Smith,   Laurence; Lorenzen,   Kai.
Tipo: Report
Palavras-chave: Fisheries; Irrigation effects; Assessment; Social aspects; Villages; Irrigation programs; Lagoons; Drainage; Households; Rice; Case studies; Community/Rural/Urban Development; Crop Production/Industries; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/92824

Speaking Stata: Turning over a new leaf
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Stem-and-leaf displays have been widely taught since John W. Tukey publicized them energetically in the 1970s. They remain useful for many distributions of small or modest size, especially for showing fine structure such as digit preference. Stata’s implementation stem produces typed text displays and has some inevitable limitations, especially for comparison of two or more displays. One can re-create stem-and-leaf displays with a few basic Stata commands as scatterplots of stem variable versus position on line with leaves shown as marker labels. Comparison of displays then becomes easy and natural using scatter, by(). Back-to-back presentation of paired displays is also possible. I discuss variants on standard stem-and-leaf displays in which each distinct...
Tipo: Article
Palavras-chave: Stemplot; Stem-and-leaf; Graphics; Distributions; Digit preference; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119285

Theoretische Grundlagen und die Rolle parametrischer bzw. nicht-parametrischer Modellansätze in der Politikevaluation Replik zu Anne Margarian, Johann Heinrich von Thünen-Institut, Braunschweig
Provedor de dados: 31
Autores: Henning,   Christian H.C.A.; Michalek,   Jerzy.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97705

Quasi-option values for enhanced information regarding genetically modified foods
Provedor de dados: 31
Autores: Donaghy,   Peter; Rolfe,   John; Bennett,   Jeffrey W.
Issues concerning the long-term environmental and health risks associated with the production of genetically modified foods remain highly topical in Australia. It is unclear how consumers values for a precautionary approach to the release of genetically modified crops compares to the opportunity costs of forgoing economic growth associated with the use of these technologies. In this paper, an application of the contingent valuation method is reported. That technique was used to estimate quasi-option values held by consumers regarding a potential five year moratorium on the use of genetic modification in Australian agriculture. The results are compared to the estimated opportunity costs of imposing such a ban o Queensland consumers.
Tipo: Conference Paper or Presentation
Palavras-chave: Quasi-option values; Genetically modified organisms; Contingent valuation; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/58403

RESPONDENTS TO CONTINGENT VALUATION SURVEYS: CONSUMERS OR CITIZENS?
Provedor de dados: 31
Autores: Blamey,   Russell K.; Common,   Mick S.; Quiggin,   John C.
The fundamental assumption of the contingent valuation method (CYM) is that responses to CY questionnaires may be interpreted as expressions of consumer preferences. The consumer preference interpretation has been challenged in recent papers arguing that willingness to pay for wildlife preservation is generated, at least in part, by ethical concerns, rather than by a view that wildlife preservation will yield any benefit to individual respondents. Some further evidence bearing upon these questions is derived from a study of forest management in Australia undertaken by the Resource Assessment Commission (RAC). The evidence supports the interpretation that respondents are acting primarily as citizens.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/22679

IMPACT OF CAPITAL ON THE GROWTH PROCESS OF A SUGARCANE FARM IN MPUMALANGA
Provedor de dados: 31
Autores: Haile,   B.O.; Grove,   Bennie; Oosthuizen,   L.K.
The research was conducted for a representative 50 ha farm in the Onderberg region in Mpumalanga province, where farmers use a combination of centre-pivot, drip, and dragline systems of different sizes to grow sugarcane. The main intention was to establish a multi-period linear programming model capable of economically evaluating a farm expansion decision making process for farmers faced with investment decisions in alternative irrigation systems, taking in to account the available initial capital of the farm. A linear programming (LP) model was used to assign a mainline for a total of twelve irrigation system combinations based on the assumption that the farmer wishes to start with a 30 ha centre-pivot investment. Generalized Algebraic Modelling System...
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/19081

Censored Quantile Regression and Purchases of Ice Cream
Provedor de dados: 31
Autores: Gustavsen,   Geir Waehler; Jolliffe,   Dean; Rickertsen,   Kyrre.
The effects on purchases of ice cream of increasing the value added tax (VAT) for less healthy foods and removing the VAT for healthy foods are estimated. The effects on high- and low-purchasing households are estimated by using quantile regressions. Many households did not purchase ice cream and censored quantile regressions are estimated by a recently developed algorithm, which is simple, robust, and performs well near the censoring point. High-purchasing households will reduce their annual per capita purchases with 1.8 kilograms corresponding to an annual reduction of more than half a kilogram of body weight.
Tipo: Conference Paper or Presentation
Palavras-chave: Censored quantile regression; Ice cream; Obesity; Purchase; Taxes; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6534

Determining the change in welfare estimates from introducing measurement error in non-linear choice models
Provedor de dados: 31
Autores: Gibson,   Fiona L.; Burton,   Michael P.
Observed and unobserved characteristics of an individual are often used by researchers to explain choices over the provision of environmental goods. One means for identifying what is typically an unobserved characteristic, such as an attitude, is through some data reduction technique, such as factor analysis. However, the resultant variable represents the true attitude with measurement error, and hence, when included into a non-linear choice model, introduces bias in the model. There are well established methods to overcome this issue, which are seldom implemented. In an application to preferences over two water source alternatives for Perth in Western Australia, we use structural equation modeling within a discrete choice model to determine whether...
Tipo: Working or Discussion Paper
Palavras-chave: Contingent valuation; Attitudes; Structural equation modeling; Recycled water; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q51; Q53; C13.
Ano: 2011
URL: http://purl.umn.edu/103428

Automated model linkages: the example of CAPRI
Provedor de dados: 31
Autores: Britz,   Wolfgang.
Increasing demand for policy impact assessment regarding social, economic and environmental aspects asks for combined application of different models and tools. The paper discusses concepts and challenges in linking models, taking CAPRI (Common Agricultural Policy Regionalised Impact) model as an example. CAPRI combines different economic models, spatial downscaling and interfaces to bio-physical components. 250 non-linear regional programming models with econometrically estimated costs functions cover the EU-27, Norway and Western Balkans. They are consistently linked to a spatial globally closed trade model, covering 60 countries / country blocks and 50 primary and secondary agricultural products. The link is based on sequential calibration: the market...
Tipo: Journal Article
Palavras-chave: Model linkage; Linking economic and environmental models; Policy impact assessment; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97707

ECONOMICS OF PRODUCTIVE TRAITS OF SOME EGG-LAYER STRAINS UNDER EGYPTIAN CONDITIONS
Provedor de dados: 31
Autores: Soliman,   Ibrahim; Marai,   I. Fayez M.
University College of North Wales, Bangor, Gwynedd LL57 2UW Wales, Inited Kingdom
Tipo: Presentation
Palavras-chave: Average Cost Curve; Profitabilityu; Mortality Rate; Eggs Yield per Hen Housed Per Month; Feed Consumption; Farm Management; Livestock Production/Industries; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/119682

Bayesian estimation of non-stationary Markov models combining micro and macro data
Provedor de dados: 31
Autores: Storm,   Hugo; Heckelei,   Thomas.
In this poster a Bayesian estimation framework for a non-stationary Markov model is developed for situations where sample data with observed transition between classes (micro data) and aggregate population shares (macro data) are available. Posterior distributions on transition probabilities are derived based on a micro based prior and a macro based Likelihood function thereby consistently combining previously separated approaches. Monte Carlo simulations for ordered and unordered Markov states show how observed micro transitions improve precision of posterior knowledge as the sample size increases.
Tipo: Conference Paper or Presentation
Palavras-chave: Bayesian estimation; Markov transitions; Prior information; Multinomial logit; Ordered multinomial logit; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103645

Individual social capital and access to formal credit in Thailand
Provedor de dados: 31
Autores: Dufhues,   Thomas; Buchenrieder,   Gertrud; Munkung,   Nuchanata.
This study shows how different forms of individual social capital affect  access to formal credit in rural Thailand. In the context of agriculture economics, an  innovative data collection approach is used that originates from the field of sociology  (personal network survey). We measure social capital according to: 1. the tie strength  between the respondent and the personal network member (bonding/bridging); and 2. the  social distance between the respondent and the personal network member (linking).  Strong ties (bonding) in combination with access to socially distant network members  (linking) reduce the chances of being access-constrained.
Tipo: Presentation
Palavras-chave: Thailand; Access to credit; Social capital; Personal networks; Agricultural Finance; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/123401

OPTIMAL FEED COST STRATEGIES ASSOCIATED WITH EARLY AND LATE CALVING SEASONS
Provedor de dados: 31
Autores: May,   Gary J.; Van Tassell,   Larry W.; Smith,   Michael A.; Waggoner,   James W.
Integer programming models were used to examine optimal monthly feeding strategies and costs for March and May calving alternatives.  Body condition scores were allowed to fluctuate throughout the year except for calving and breeding periods.  The May calving strategy decreased annual feeding costs by $20 per cow.
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20878

Location and Spatial Pricing in Agricultural Markets
Provedor de dados: 31
Autores: Graubner,   Marten; Balmann,   Alfons; Sexton,   Richard J.
Agricultural markets often feature significant transport costs and spatially distributed production and processing which causes spatial imperfect competition. Spatial economics considers the firms’ decisions regarding location and spatial price strategy separately, usually on the demand side, and under restrictive assumptions. Therefore, alternative approaches are needed to explain, e.g., the location of new ethanol plants in the U.S. at peripheral as well as at central locations and the observation of different spatial price strategies in the market. We use an agent-based simulation model to analyze location and spatial pricing in a general model under multi-firm competition, two-dimensional space, and a continuum of potential price strategies. The...
Tipo: Conference Paper or Presentation
Palavras-chave: Spatial competition; Location; Price discrimination; Oligopsony; Simulation; Industrial Organization; Research Methods/ Statistical Methods; C63; Q11; R32.
Ano: 2010
URL: http://purl.umn.edu/61225

Valuing Consumer Preferences with the CUB Model: A Case Study of Fairtrade Coffee
Provedor de dados: 31
Autores: Cicia,   Gianni; Corduas,   Marcella; Del Giudice,   Teresa; Piccolo,   Domenico.
In recent years, in the field of consumer behaviour, a large number of new models and instruments for preference analysis have been proposed. This strand of the literature has developed along two different lines. The first has produced approaches that have a more solid economic basis, but which at the same time require increasingly complex econometric analysis. Moreover, in this research field, based on stochastic utility theory and choice experiments, less weight is given to the socio-economic and psychometric characteristics of the individual in determining preferences. By contrast, the second strand has given rise to many methods to analyse consumer behaviour based on quality approaches such as laddering or focus groups where behavioural characteristics...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/59209

Structuring Exotic Options Contracts on Water to Improve the Efficiency of Resource Allocation in the Water Spot Market
Provedor de dados: 31
Autores: Williamson,   Brendon; Villano,   Renato A.; Fleming,   Euan M.
With the current drought in South-Eastern Australia highlighting the scarcity and value of inland Australia’s water resources, focus turns to how these resources can be allocated more efficiently. The first major step was taken almost a decade ago with the separation of land and water property rights allowing openly traded water markets. This study assesses the potential economic benefits that options contracts bring to the water market in the Murray Valley water market. Exotic call options are estimated using both Black-Scholes and skewness-and-kurtosis-amended Black-Scholes financial option pricing methods that are based on three years of data on water prices. While the presence of options would result in significant economic benefits in the more...
Tipo: Conference Paper or Presentation
Palavras-chave: Options; Skewness-and-kurtosis-amended Black-Scholes model; Water; Environmental Economics and Policy; Financial Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/5992

RECENT DEVELOPMENTS IN FRONTIER MODELLING AND EFFICIENCY MEASUREMENT
Provedor de dados: 31
Autores: Coelli,   Tim J.
In this paper recent developments in the estimation of frontier functions and the measurement of efficiency are surveyed, and the potential applicability of these methods in agricultural economics is discussed. Frontier production, cost and profit functions are discussed, along with the construction of technical, allocative, scale and overall efficiency measures relative to these estimated frontiers. The two primary methods of frontier estimation, econometric and linear programming, are compared. A survey of recent applications of frontier methods in agriculture is also provided.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/22681

Some Notes on "Dynamic" Linear Programming
Provedor de dados: 31
Autores: Throsby,   C.D.
The most common application of linear programming in agricultural situations has been to the problem of resource allocation between competing farm activities. Given relevant input-output information for a specific farm, together with real or assumed price and cost patterns, the technique of linear programming enables calculation of the combination of enterprises which maximizes net profit, within the limitations imposed by the availability of farm resources.  It is necessary in some linear programming analyses to make explicit allowance for the peculiar influence of time on the structure of the system under study. Of the many ways in which this may be achieved, this article considers four, which have been, or are likely to be, of relevance in an...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1962
URL: http://purl.umn.edu/8738

Ausmaß und Determinanten von Preisrigiditäten im deutschen Lebensmitteleinzelhandel - Eine emprische Analyse mit Scannerdaten
Provedor de dados: 31
Autores: Weber,   Sascha A.
Although the dissertation is in German, on demand a bilateral discussion can be done in English language.
Tipo: Thesis or Dissertation
Palavras-chave: Retailing; Price rigidity; Menu costs; Psychological pricing; Seemingly-unrelated-regression; Price elasticity; Store types; Agribusiness; Demand and Price Analysis; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94613

Creating a Vision for XYZ Research Corporation: A Case Study
Provedor de dados: 31
Autores: Jaramillo,   Paul E.; House,   Lisa; Wysocki,   Allen F.
A strategic analysis was developed for XYZ Research Corporation (the true company's name is disguised). The strategic analysis involved a series of visits to the company to conduct focus groups with its employees and management. Five focus groups were carried out at XYZ Research Corporation. This method proved to be effective and valuable when aiming to gather detailed information on the specifics of a firm's operation. Information and insights on the company and its business that would not become evident through any kind of meticulous financial or economic analysis of the company's and industry's numbers - which in fact were unavailable or scarce - was efficiently obtained by personal communication from the employees in the interviews.   The focus group...
Tipo: Conference Paper or Presentation
Palavras-chave: Focus Groups; Strategic Analysis; Food Safety; Outsourcing; Research Methods/ Statistical Methods; A22; C99; L21; M10.
Ano: 2005
URL: http://purl.umn.edu/19476

Stata tip 50: Efficient use of summarize
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119288

Spatial Replicator Dynamics as a Model of Agricultural Technology Adoption
Provedor de dados: 31
Autores: Beard,   Rodney; Purcell,   Tim.
Many explanations of agricultural technology adoption have either been based loosely on diffusion concepts and have ignored economic factors or have been static economic models that ignore dynamic and spatial aspects of adoption. In this paper we propose a model of adoption which incorporates economic factors in a spatial and dynamic framework. the approach used is based on extending replicator dynamics models in evolutionary game theory to a spatial setting. The replicator dynamics of adopters versus non-adopters are characterised by a spatial diffusion model the solution of which illustrates how local institutions drive spatial technology adoption processes via the rules of the game. The model is applied to forage technology adoption in the Philippines...
Tipo: Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/123601

ARER Guidelines for Manuscript Submission
Provedor de dados: 31
Inside back cover
Tipo: Journal Article
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Industrial Organization; Institutional and Behavioral Economics; International Development; International Relations/Trade; Labor and Human Capital; Land Economics/Use; Livestock Production/Industries; Marketing; Political Economy; Production Economics; Productivity Analysis; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/55554

Review of Regression Models for Categorical Dependent Variables Using Stata by Long and Freese
Provedor de dados: 31
Autores: Hendrickx,   John.
This article reviews Regression Models for Categorical Dependent Variables Using Stata by Long and Freese.
Tipo: Journal Article
Palavras-chave: Categorical data; Regression models; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115954

Trees and water: smallholder agroforestry on irrigated lands in Northern India
Provedor de dados: 31
Autores: Zomer,   Robert J.; Bossio,   Deborah A.; Trabucco,   Antonio; Yuanjie,   Li; Gupta,   Diwan C.; Singh,   Virendra P.
Trees are increasingly grown on-farm to supply wood and biomass needs within developing countries. Over the last several decades, within the irrigated rice-wheat growing lands of northern India, fast-growing poplar trees have been planted on tens of thousands of small farms. Recent debate regarding afforestation has raised the issue that water use is often increased when trees are planted. This ongoing debate focuses primarily on afforestation or reforestation of upland and rain-fed agricultural areas, and off-site impacts such as reduced streamflow. Adoption of poplar agroforestry in northern India, in contrast, is occurring in areas where land and water are already intensively used and managed for agricultural production. This study based on farmer...
Tipo: Report
Palavras-chave: Trees; Populus deltoids; Agroforestry; Afforestation; Reforestation; Models; Water use; Water balance; Evapotranspiration; Precipitation; Remote sensing; Irrigation requirements; India; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2007
URL: http://purl.umn.edu/53067

Estimation of Actual and potential adoption rates and determinants of a new technology not universally known in the population: The case of NERICA rice varieties in Guinea
Provedor de dados: 31
Autores: Diagne,   Aliou; Sogbossi,   Marie-Josee; Simtowe,   Franklin; Diawara,   Sekou; Diallo,   Abdoulaye Sadio; Barry,   Alpha Bacar.
The NERICA (New Rice for Africa) rice varieties, developed by the Africa Rice Center during the 1990s, are providing hopes for raising the productivity of upland rice farmers in Africa because of their reported high yield potential and adaptability to the African conditions. The varieties are new and not widely disseminated in farming communities and there is lot of interest in the donor community in knowing their potential for widespread adoption across sub-Saharan Africa (SSA).  However, when a technology is new and the target population is not universally exposed it, the observed sample adoption rate and classical models of adoption widely used in adoption studies does not inform reliably on its potential adoption and constraint to it in the full...
Tipo: Conference Paper or Presentation
Palavras-chave: NERICA varieties; Technology Diffusion and adoption; Average Treatment Effect; Guinea; International Development; Research Methods/ Statistical Methods; C13; O33; Q12; Q16.
Ano: 2009
URL: http://purl.umn.edu/51644

MODELING SPATIAL DEPENDENCE AND SPATIAL HETEROGENEITY IN COUNTY YIELD FORECASTING MODELS
Provedor de dados: 31
Autores: DiRienzo,   Cassandra; Fackler,   Paul L.; Goodwin,   Barry K.
The implications of ignoring potential spatial dependence in county-level yield data are discussed.  Spatial dependence in a county-level yield data set is identified and methods for correcting the dependence via spatial weighting matrices and generalized least squares regression are performed.  The paper also examines how the spatial dependence declines as the distance between observations increases.
Tipo: Conference Paper or Presentation
Palavras-chave: Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21763

The North Dakota Input-Output Model: A Tool for Analyzing Economic Linkages
Provedor de dados: 31
Autores: Coon,   Randal C.; Leistritz,   F. Larry; Hertsgaard,   Thor A.; Leholm,   Arlen G.
North Dakota's input-output model has become an integral part of many economic research activities involving state issues. Since its development to analyze the economic impacts associated with irrigation development in the 1960s, the model has been updated and used to analyze the effects of a wide variety of projects in North Dakota, Because the model is used and referenced frequently by economic researchers, the nontechnical audience often requests additional information to explain the input-output model and the theory behind it. The purpose of this report is to explain the principles of input-output analysis, to describe the structure of the North Dakota model, and to explain how to interpret the results that might be found in a feasibility or economic...
Tipo: Working or Discussion Paper
Palavras-chave: Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/23304

SELECTING FUNCTIONAL FORM IN PRODUCTION FUNCTION ANALYSIS
Provedor de dados: 31
Autores: Griffin,   Ronald C.; Montgomery,   John M.; Rister,   M. Edward.
Functional form selection is a sometimes neglected aspect of applied research in production analysis. To provide an improved and uniform basis for form selection, a number of traditional and popular functional forms are catalogued with respect to intrinsic properties. Guidelines for the conduct of form selection are also discussed.
Tipo: Journal Article
Palavras-chave: Production Economics; Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/32240

Least likely observations in regression models for categorical outcomes
Provedor de dados: 31
Autores: Freese,   Jeremy.
This article presents a method and program for identifying poorly fitting observations for maximum-likelihood regression models for categorical dependent variables. After estimating a model, the program least likely will list the observations that have the lowest predicted probabilities of observing the value of the outcome category that was actually observed. For example, when run after estimating a binary logistic regression model, least likely will list the observations with a positive outcome that had the lowest predicted probabilities of a positive outcome and the observations with a negative outcome that had the lowest predicted probabilities of a negative outcome. These can be considered the observations in which the outcome is most surprising given...
Tipo: Journal Article
Palavras-chave: Outliers; Predicted probabilities; Categorical dependent variables; Logistic regression; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116014

Alternative to Disincentive Rice Producer Prices in Madagascar: Case Study in Alaotra Prefecture and Bongolava Prefecture
Provedor de dados: 31
Autores: Ralandison,   Tsilavo; Shiratake,   Yoshiharu.
This study identifies the reasons for low producer prices of rice that have not covered its production costs for many years in Madagascar. The following points will be discussed: the farmers’ marketing conditions and the rural rice market structure, including the functions of each intervening trader preceding rice distribution in urban centers. The study also assesses current functions of the agricultural farmer cooperative: an organization expected to enable the establishment of fair trade in the domestic rice market. The data come from interviews conducted with 120 farmers, 20 traders, and the survey of the overall cooperative associations in two prefectures and main rice suppliers of the capital city. The analysis reveals that farmers were often...
Tipo: Conference Paper or Presentation
Palavras-chave: Cooperatives; Madagascar; Markets; Rice; Agricultural and Food Policy; Consumer/Household Economics; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/52005

QUIP: Understanding Clients Through In-Depth Interviews
Provedor de dados: 31
QUIP (Qualitative in-depth individual impact assessment protocol) is a practical method to help managers of microfinance institutions (MFIs) better understand their clients through market research or impact assessment.  Most managers would like to know who is benefiting and who is losing out from their services, and why this might be.  This is vital information if they wish to design services that are effective and useful for clients.
Tipo: Report
Palavras-chave: Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/23735

Agricultural land tax and farm-level resource use and output supply response
Provedor de dados: 31
Autores: Olubode-Awosola,   Femi.
This study develops and uses a programming model for farm-level resource use and output supply response to estimate the effects of agricultural land tax in South Africa: A case study of Free State, a region of extremely large commercial farms that gained their size and economic heft during the apartheid years of aggressive subsidies, favorable tax treatment, lucrative state grants and gifts, and all manner of financial assistance. The results indicate that changes in land use and output supply are marginal. The highest effects are observed on irrigated farming. Relevant policy responses raised by the findings are discussed.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural land tax; Farm-level; Resource use; Output supply; Land reform; South Africa; Case study; Programming model; Agricultural and Food Policy; Farm Management; Food Security and Poverty; Land Economics/Use; Political Economy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/51664

Conclusive Evidence on the Benefits of Temporal Disaggregation to Improve the Precision of Time Series Model Forecasts
Provedor de dados: 31
Autores: Ramirez,   Octavio A.
Simulation methods are used to measure the expected differentials between the Mean Square Errors of the forecasts from models based on temporally disaggregated versus aggregated data. This allows for novel comparisons including long-order ARMA models, such as those expected with weekly data, under realistic conditions where the parameter values have to be estimated. The ambivalence of past empirical evidence on the benefits of disaggregation is addressed by analyzing four different economic time series for which relatively large sample sizes are available. Because of this, a sufficient number of predictions can be considered to obtain conclusive results from out-of-sample forecasting contests. The validity of the conventional method for inferring the order...
Tipo: Report
Palavras-chave: Data Aggregation; Efficient Forecasting; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/113520

A SYSTEM DYNAMICS MODEL OF AGRICULTURE AND RURAL DEVELOPMENT: THE TOPMARD CORE MODEL
Provedor de dados: 31
Autores: Johnson,   Thomas G.; Bryden,   John Marshall; Refsgaard,   Karen; Alva Lizarraga,   Sara.
The goal of the TOPMARD project is to develop a model of agriculture and rural development to better understand the agronomic, ecological, economic and social dimensions of rural regions. The resulting model, (Policy Model of Multifunctional Agriculture and Rural Development) was built collaboratively and hierarchically by the research teams from the 11 countries. The model features eight subsectors (Land, Agriculture, Tourism, Region, Human Resources, Non-commodities, Capital, and Quality of Life). Imbedded in the model are a complete dynamic input-output model, and an agecohort education demographic model. The model has both supply-side and demand-side drivers. Land use is the key supply-side driver. Land use, coupled with production system choices,...
Tipo: Conference Paper or Presentation
Palavras-chave: Multifunctionality; System dynamics; Policy; Model; Rural development; Community/Rural/Urban Development; Research Methods/ Statistical Methods; Research and Development/Tech Change/Emerging Technologies.
Ano: 2008
URL: http://purl.umn.edu/6497

THE EQUIVALENCE OF EVOLUTIONARY GAMES AND DISTRIBUTED MONTE CARLO LEARNING
Provedor de dados: 31
Autores: Sasaki,   Yuya.
This paper presents a tight relationship between evolutionary game theory and distributed intelligence models.  After reviewing some existing theories of replicator dynamics and distributed Monte Carlo learning, we make formulations and proofs of the equivalence between these two models.  The relationship will be revealed not only from a theoretical viewpoint, but also by experimental simulations of the models by taking a simple symmetric zero-sum game as an example. As a consequence, it will be verified that seemingly chaotic macro dynamics generated by distributed micro-decisions can be explained with theoretical models.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/28338

Web surveys, sample bias and the travel cost method
Provedor de dados: 31
Autores: Fleming,   Christopher M.; Cook,   Averil.
Environmental economists have long used surveys to gather information about people's preferences. This is particularly true in the field of non-market valuation, where techniques such as contingent valuation, choice modelling and the travel cost method invariably employ some form of survey instrument. A recent innovation in survey methodology has been the advent of web-based surveys. While popular in many other disciplines, to date, very few non-market valuation studies have employed the Internet as a survey tool. A primary concern of non-market valuation practitioners is the potential sampling biases associated with web-based surveys and the effect this may have on valuation estimates. In this paper the results of two travel cost surveys, one conducted...
Tipo: Conference Paper or Presentation
Palavras-chave: Web-surveys; Sample bias; Travel cost method; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/10358

Social Accounting Matrices and Economic Modelling
Provedor de dados: 31
Autores: Pauw,   Kalie.
A Social Accounting Matrix (SAM) is a comprehensive, economy-wide database that contains information about the flow of resources associated with all transactions that have taken place between economic agents in an economy during a given period of time. Its use can extend beyond that of serving as a summary of transactions that have taken place in an economy. The SAM approach to modelling makes use of the SAM format to present economic theory. The versatility of SAMs has made them databases of preference for economic modelling. This paper provides an overview of the structure of a SAM, touching on issues such as economic accounting, the circular flow of resources in the economy and the SAM-accounts, and thereafter explains the SAM approach to modelling. As...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/15610

Impacts of Observation Deleting Standards on Profitability Analysis of Precision Agriculture
Provedor de dados: 31
Autores: Song,   Baohui; Dillon,   Carl R.; Mueller,   Thomas.
This research explores a possible reason for the inconsistent results from previous study on the profitability analysis in precision agriculture - different standards of identifying possible erroneous observations for PA datasets. By comparing the results from the different standards of identifying possible erroneous observations, this research raises concerns about the negative impacts of different standards of identifying possible erroneous observations on the profitability analysis of PA, and provides some suggestions for the standard which could be used in the future profitability analysis of PA.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6821

Agricultural Input Market Segments: Who Is Buying What?
Provedor de dados: 31
Autores: Alexander,   Corinne E.; Wilson,   Christine A.; Foley,   Daniel H.
For agribusiness managers and salespeople, understanding customers and their preferences and behaviors is crucial to success. This study uses cluster analysis to identify five distinct buyer segments for expendable input purchases for U.S. crop and livestock commercial producers. A multinomial logit model is used to predict segment membership based on demographic, behavioral, and business management factors. Results provide important information for agricultural input suppliers.
Tipo: Journal Article
Palavras-chave: Cluster analysis; Input suppliers; Market segmentation; Multinomial logit; Marketing; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/59673

UK parliamentary inquiry into global food crisis: call for evidence: How to better manage water so that 9 billion people can be fed equitably, healthily, safely and sustainably by 2050
Provedor de dados: 31
Autores: Chartres,   Colin J.
Invited submission from the International Water Management Institute (IWMI) to the United Kingdom Parliament on 2 June 2009.
Tipo: Report
Palavras-chave: Research institutes; Agricultural research; Policy; Water resource management; Irrigated farming; Rainfed farming; Farming systems; Food security; Water productivity; Water scarcity; Population growth; Water reuse; Food production; Water use; Biofuels; Urbanization; Climate change; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Political Economy; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/91800

Confidence intervals for rank statistics: Percentile slopes, differences, and ratios
Provedor de dados: 31
Autores: Newson,   Roger.
I present a program, censlope, for calculating confidence intervals for generalized Theil–Sen median (and other percentile) slopes (and per-unit ratios) of Y with respect to X. The confidence intervals are robust to the possibility that the conditional population distributions of Y , given different values of X, differ in ways other than location, such as having unequal variances. censlope uses the program somersd and is part of the somersd package. censlope can therefore estimate confounder-adjusted percentile slopes, limited to comparisons within strata defined by values of confounders, or by values of a propensity score representing multiple confounders. Iterative numerical methods have been implemented in the Mata language, enabling efficient...
Tipo: Article
Palavras-chave: Somersd; Censlope; ALSPAC; Robust; Confidence interval; Rank; Nonparametric; Median; Percentile; Slope; Difference; Ratio; Kendall's τ; Somers' D; Theil–Sen; Hodges–Lehmann; Confounder adjusted; Propensity score; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119241

How Do Restaurants Benefit from Various Components of a Regional Promotion Campaign?
Provedor de dados: 31
Autores: Xie,   Ran; Isengildina-Massa,   Olga; Carpio,   Carlos E.
This study analyses the economic value of various components of the Certified South Carolina Grown Campaign from the perspective of participating restaurants. A stated-preference choice experiment was conducted as part of the restaurant survey to estimate the willingness to pay (WTP) for each campaign component using a mixed logit model. Individual level WTP was calculated in order to explore the relationship between WTP and characteristics of restaurants. Results indicate that three existing components--Labeling, Multimedia Advertising, and "Fresh on the Menu" have significant positive economic value.
Tipo: Presentation
Palavras-chave: WTP; Mixed Logit Model; SUR Model; Discrete Choice Model; Agribusiness; Agricultural and Food Policy; Political Economy; Production Economics; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/123921

A Multi-Period Analysis of Two Common Livestock Management Strategies Given Fluctuating Precipitation and Variable Prices
Provedor de dados: 31
Autores: Ritten,   John P.; Frasier,   W. Marshall; Bastian,   Christopher T.; Paisley,   Steven I.; Smith,   Michael A.; Mooney,   Sian.
Many areas of the US recently endured a severe drought and management strategies to cope with the lack of forage production varied. A multi-period mathematical model is presented that estimates the outcomes of two common producer responses to changes in precipitation, partial liquidation and purchasing hay, given fluctuating cattle prices over a long term planning horizon. Results were further summarized with regression analysis and selected elasticities were calculated to reflect the sensitivity of outcomes to variability in precipitation and livestock prices. Although little impact was seen from utilizing additional hay as a strategy during drought, producers who follow this strategy are in a position to market more animals immediately post drought in...
Tipo: Journal Article
Palavras-chave: Drought management; Mathematical programming; Herd liquidation; Price cycle; Cattle management; Agribusiness; Agricultural Finance; Farm Management; Livestock Production/Industries; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; Q12; C61; D24.
Ano: 2010
URL: http://purl.umn.edu/90673

ENDOGENOUS TRANSACTION COSTS AND TRADABILITY IN A MICRO ECONOMYWIDE MODEL - A STYLIZED APPLICATION WITH NONSEPARABLE HOUSEHOLDS
Provedor de dados: 31
Autores: Kuiper,   Marijke H.
This paper analyzes effects of transaction costs on household responses, adding to direct effects via price-bands, indirect effects through reduced availability of productive resources and through changes in price formation. A micro economywide model with nonseparable household models is developed, in which transaction costs determine effective prices through an endogenous, household-specific price-band. Moreover, transaction costs influence household decisions by claiming productive resources, and by affecting endogenous prices at household or micro-economy level. Comparison of two stylized village model specifications indicates that indirect effects of transaction costs reduce household supply response, despite reducing the range of prices for which...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19832

THE BAYESIAN DECISION MODEL WITH MORE THAN ONE PREDICTOR--AN APPLICATION TO THE STOCKING RATE PROBLEM
Provedor de dados: 31
Autores: White,   Fred C.; Eidman,   Vernon R.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1971
URL: http://purl.umn.edu/30497

A DYNAMIC AND STOCHASTIC PERSPECTIVE ON THE ROLE OF TIME IN RANGE MANAGEMENT
Provedor de dados: 31
Autores: Batabyal,   Amitrajeet A.; Biswas,   Basudeb; Godfrey,   E. Bruce.
This chapter uses a new ecological-economic approach to analyze the role of time in range management in a dynamic and stochastic setting. We first construct a theoretical model of a parcel of rangeland in which time restrictions are used to manage the land. We then show how the dynamic and the stochastic properties of this rangeland can be used to construct two managerial objectives that are ecologically and economically meaningful. Finally, using these two objectives, we discuss an approach to range management in which the manager has two interrelated goals. This manager maximizes the profits from range operations and (s)he also takes steps to move the rangeland away from the least desirable state of existence.
Tipo: Conference Paper or Presentation
Palavras-chave: Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22149

Stata tip 39: In a list or out? In a range or out?
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119250

Box-Jenkins Forecasting Models: Comment
Provedor de dados: 31
Autores: Revell,   Brian J.
Two recent papers in this Review (Vol 47, No.2, August 1979) set out to evaluate alternative forecasting techniques applied in the Australian beef market. The two papers: "Forecasting NSW Beef Production: An Evaluation of Alternative Techniques," by C. Gellatly, and "Comparing the Box-Jenkins and Econometric Techniques for Forecasting Beef Prices" by I.J. Bourke both give rise for some concern at the choice of Box-Jenkins models which were estimated. In consequence the subsequent comparative model evaluations may reflect rather more poorly on the technique than they otherwise might. Although my comments have some features common to both papers, it will be appropriate to deal with each individually .
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1981
URL: http://purl.umn.edu/12248

Some Properties of Simple Functions of Random Variables
Provedor de dados: 31
Autores: Anderson,   Jock R.; Doran,   Howard E.
Simple functions of random variables, such as sums, products, quotients and powers, arise in many applications in stochastic economics. It is sometimes convenient to determine the moments of such functions. Cases where this has been or can be done analytically are reviewed, and comments offered on procedures for when analysis fails.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/10336

AN EVALUATION OF POLICY INSTRUMENTS
Provedor de dados: 31
Autores: Brandow,   George E.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1976
URL: http://purl.umn.edu/17785

National Conference on Water, Food Security and Climate Change in Sri Lanka, Volume 2: Proceedings of the Water Quality, Environment and Climate Change, BMICH, Colombo June 9-11, 2009
Provedor de dados: 31
Tipo: Presentation
Palavras-chave: Wetlands; Environmental flows; Assessment; Water allocation; Case studies; Rivers; Farming systems; Models; Groundwater; Aquifers; Domestic water; Rainfed farming; Climate change; Wastewater irrigation; Rice; Food security; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Livestock Production/Industries; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/118404

Decentralization, Pro-Poor Land Policies, and Democratic Governance
Provedor de dados: 31
Autores: Meinzen-Dick,   Ruth Suseela; di Gregorio,   Monica; Dohrn,   Stephan.
Tipo: Conference Paper or Presentation
Palavras-chave: Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/44353

Reliable estimation of generalized linear mixed models using adaptive quadrature
Provedor de dados: 31
Autores: Rabe-Hesketh,   Sophia; Skrondal,   Anders; Pickles,   Andrew.
Generalized linear mixed models or multilevel regression models have become increasingly popular. Several methods have been proposed for estimating such models. However, to date there is no single method that can be assumed to work well in all circumstances in terms of both parameter recovery and computational efficiency. Stata’s xt commands for two-level generalized linear mixed models (e.g., xtlogit) employ Gauss–Hermite quadrature to evaluate and maximize the marginal log likelihood. The method generally works very well, and often better than common contenders such as MQL and PQL, but there are cases where quadrature performs poorly. Adaptive quadrature has been suggested to overcome these problems in the two-level case. We have recently implemented a...
Tipo: Journal Article
Palavras-chave: Adaptive quadrature; Gllamm; Generalized linear mixed models; Random-effects models; Panel data; Numerical integration; Adaptive integration; Multilevel models; Clustered data; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115947

MATHEMATICAL PROGRAMMING MODELS EMPLOYED IN THE ANALYSIS OF THE COMMON AGRICULTURE POLICY
Provedor de dados: 31
Autores: Arfini,   Filippo.
The goal of this paper is to provide information about the progress, over the last 10 years, of mathematical programming for analysis of the behaviour of farm producers under the European Union Common Agricultural Policy. We show in detail the evolution of mathematical programming and how this methodology can be applied at different levels (regions or sectors) for the main CAP policies. The evolution of mathematical programming is shown by the emergence of a new group of supply and equilibrium models, "Positive Mathematical Programming" (PMP) and "Symmetric Positive Equilibrium Problems". (SPEP) SPEP was developed in order to solve problems posed by the  lack of data and the need for methodologies to represent different farm typologies in different...
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/14803

Economists, Value Judgments, and Climate Change: A View From Feminist Economics
Provedor de dados: 31
Autores: Nelson,   Julie A.
A number of recent discussions about ethical issues in climate change, as engaged in by economists, have focused on the value of the parameter representing the rate of time preference within models of optimal growth. This essay examines many economists’ antipathy to serious discussion of ethical matters, and suggests that the avoidance of questions of intergenerational equity is related to another set of value judgments concerning the quality and objectivity of economic practice. Using insights from feminist philosophy of science and research on high reliability organizations, this essay argues that a more ethically transparent, real-world-oriented, and flexible economic practice would lead to more strongly objective, reliable, and useful knowledge.
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Industrial Organization; Institutional and Behavioral Economics; Political Economy; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Teaching/Communication/Extension/Profession.
Ano: 2007
URL: http://purl.umn.edu/37280

Cluster Analysis on Per Capita Net Income of Rural Households in China
Provedor de dados: 31
Autores: Guan,   Linlin; Men,   Ke-pei.
We summarize the status of rural areas in China, and introduce the principle of Cluster Analysis. According to related statistical data, per capita net income of rural households in various regions of China is analyzed by adopting the method of Cluster Analysis. The results showed that 31 cities, autonomous regions and provinces in China can be divided into 4 types. The first type includes Beijing and Shanghai. Comprehensive economic strengths of these regions, as well as per capita net income of rural households, are in the forefront. The second type includes Tianjin, Jiangsu and Zhejiang Provinces of China, which have superior conditions of agricultural production with excellent foundation of agriculture and stable income sources. The third type includes...
Tipo: Thesis or Dissertation
Palavras-chave: Rural household; Per capita net income; Cluster analysis; China; Community/Rural/Urban Development; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53757

Linking Matlab and GAMS: A Supplement
Provedor de dados: 31
Autores: Wong,   Linda.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/50783

THE COMMON AGRICULTURAL POLICY IN MAIN PARTIAL EQUILIBRIUM MODELS
Provedor de dados: 31
Autores: Conforti,   Piero.
The paper reviews seven partial equilibrium global models used over the last 10 years to the analysis of the Common Agricultural Policy (ESIM, FAO-WFM, FAPRI-CARD, MISS, SPEL/EU, SWOPSIM and WATSIM). The discussion starts from the basic modelling assumptions, the data and parameters employed, by looking first at the common aspects of the models, and then at the unique characteristics of each model for simulating the effects of the CAP. Then the effectiveness of the modelling of five specific CAP tools is discussed; these are - direct price support, trade measures, supply management tools, partially "decoupled" payments, and voluntary schemes. It is argued that considerable improvements have taken place in the ability to capture the effects of changes in...
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/14806

Measuring Inverse Demand Systems and Consumer Welfare
Provedor de dados: 31
Autores: Huang,   Kuo S.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103258

Nonconventional Technology for Agricultural Development in Developing Countries
Provedor de dados: 31
Autores: Soliman,   Ibrahim.
This paper concerns the economic assessment of a nonconventional technology to provide a cheap food and/or feed for many developing countries, using wasted resources, i.e. coastal arid areas irrigated directly with seawater to grow a halophyte crop(Salicornia-sos-7). It was cultivated for two successive years in Kuwait. The analysis showed that the harvested yield was 20 tons per hectare, which provided 12.42 MT of straw for sale and 1.7 MT of oil seeds for processing. Processed seeds of 1-hectare provide 425 kg of food oil and 1.1 MT of feed meal.Under Kuwait conditions, on per hectare basis, the total costs of production( fixed &amp;variable costs)were $3088. However,simulation of this technology under a conventional developing country like Egypt with...
Tipo: Article
Palavras-chave: Halophyte Crops; Seawater irrigation system; Salicornia as oil seeds crop; Scaling Up the experiments; Profit Margin; Production function; Least cost Ration; Sheep fattning; Agribusiness; Community/Rural/Urban Development; Crop Production/Industries; Land Economics/Use; Livestock Production/Industries; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1991
URL: http://purl.umn.edu/119721

An analysis of food-economy companies’ environmental behaviour in North-East Hungary
Provedor de dados: 31
Autores: Odor,   Kinga.
After outlining environmental problems regarding food-economy2 companies and clarifying the concept of environmental behaviour, I will present the results of my questionnaire survey which focussed on food-economy companies in the Northern Great Plain region (Region). Based on solid data, the survey was designed to evaluate the companies’ commitment toward environmental protection. Sometimes the observed value systems conformed with the results of other national surveys (e.g. environmental behaviour factors; environmental protection’s rank among business aims), but at times I observed that in certain areas they truly lagged behind: for example, this held true for . the number of companies with a certified environmental-management system (EMS) and also for...
Tipo: Journal Article
Palavras-chave: Food-economy; Environmental challenges; Environmental behaviour; Environmental-conscious management.; Agribusiness; Environmental Economics and Policy; Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49197

A NONPARAMETRIC APPROACH TO SHORT-RUN PRODUCTION ANALYSIS IN A DYNAMIC CONTEXT
Provedor de dados: 31
Autores: Silva,   Elvira.
A nonparametric approach to short-run production analysis from a cost and profit perspectives is developed in the context of an adjustment-cost model.  The adjustment-cost hypothesis is incorporated in the theoretical framework in the form of the properties of the firm's technology with respect to the quasi-fixed factors.  Nonparametric tests for consistency of a data series with short-run cost minimization and profit maximization are developed and the empirical implementation of these tests to U.S. agriculture is presented.  The empirical evidence does not refute that agricultural producers behave collectively as if they were a short-run cost minimizing and profit maximizing firm.
Tipo: Conference Paper or Presentation
Palavras-chave: Nonparametric revealed-preference approach; Short-run production analysis; Long-run adjustment; Adjustment cost.; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21608

Minimum Divergence Moment Based Binary Response Models: Estimation and Inference
Provedor de dados: 31
Autores: Mittelhammer,   Ronald C.; Judge,   George G.; Miller,   Douglas J.; Cardell,   N. Scott.
This paper introduces a new class of estimators based on minimization of the Cressie-Read (CR) power divergence measure for binary choice models, where neither a parameterized distribution nor a parameterization of the mean is specified explicitly in the statistical model. By incorporating sample information in the form of conditional moment conditions and estimating choice probabilities by optimizing a member of the set of divergence measures in the CR family, a new class of nonparametric estimators evolves that requires less a priori model structure than conventional parametric estimators such as probit or logit. Asymptotic properties are derived under general regularity conditions and finite sampling properties are illustrated by Monte Carlo sampling...
Tipo: Working or Discussion Paper
Palavras-chave: Nonparametric binary response models and estimators; Conditional moment equations; Finite sample bias and precision; Squared error loss; Response variables; Cressie-Read statistic; Information theoretic methods; Research Methods/ Statistical Methods; C10; C2.
Ano: 2005
URL: http://purl.umn.edu/25020

Comparison of Different Studies to Analyse Adaptation on Dairy Farms
Provedor de dados: 31
Autores: Butler,   Anne Marie; Wallace,   Michael T.; Berentsen,   Paul B.M.
This paper compares and contrasts a number of farm-level modeling studies published in the academic literature. All of the studies examined adaptation on EU dairy farms in response to developments in agricultural policy and/or environmental legislation. The studies are compared on the basis of their respective aims, model structure, results and conclusions. Having reviewed the models and their application, the discussion section of the paper considers strengths and weaknesses of the studies and following from that it considers possible future developments in farm-level response modeling. The relevance and application of such developments in the context of an analytical study of adaptation in Irish dairy farms is discussed.
Tipo: Conference Paper or Presentation
Palavras-chave: Farm Management; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/7020

Gender Issues in Rural Eastern India Revealed by Field Interviews: Tribal and Non-Tribal Responses
Provedor de dados: 31
Autores: Tisdell,   Clement A.; Roy,   Kartik C.
Reports responses to interviews conducted in three rural villages in Eastern India in January 2000 as well as replies to questions asked at a forest meeting in West Bengal of groups/persons interested in rural women and development. The questions were designed to provide information on gender-bias and possible reasons for it, especially any economic reasons. These interviews supplemented detailed questionnaires directed to wives in these villages. Interviews were conducted with Kondhs in a village (Badala) west of Dashapalla in Orissa, with Santals in an all Santal village, (Bandhgora) in the Midnapore region of West Bengal and with Santals and scheduled caste Hindus in a mixed village, (Sadanandapur) in the same region. The results highlight significant...
Tipo: Working Paper
Palavras-chave: Economic discrimination; Education; Female status; Gender; Health; Hinduism; India; Kondhs; Santals; Social discrimination; Theories of the family.; Community/Rural/Urban Development; Food Security and Poverty; Labor and Human Capital; Land Economics/Use; Research Methods/ Statistical Methods; D1; J12; J15; J16; Z13.
Ano: 2009
URL: http://purl.umn.edu/123549

Impacts of Geographical Indications - Review of Methods and Empirical Evidences
Provedor de dados: 31
Autores: Barjolle,   Dominique; Paus,   Marguerite; Perret,   Anna O.
This paper focuses on methods for assessing the territorial impact (economic, social and environmental) of geographical indication systems. First, in a review of methods, methodological difficulties and choices are discussed and major studies are briefly presented. We highlight that it is necessary to identify a clear reference point and a relevant set of indicators and that this question has led to an active and rich research corpus. In a second part, we present some of the results of a recent European research program, SINER-GI. We analyze the impacts of 14 case studies in a common methodology. The results show significant differences of the priorities of the stakeholders between established geographical indications and geographical indications in...
Tipo: Conference Paper or Presentation
Palavras-chave: Geographical Indications; Territorial impact; Food chains; Agribusiness; Agricultural and Food Policy; Community/Rural/Urban Development; Research Methods/ Statistical Methods; O34; Q13; R58.
Ano: 2009
URL: http://purl.umn.edu/51737

Prognosen auf Agrarmärkten: Prediction Markets - eine innovative Prognosemethode auch für die Landwirtschaft?
Provedor de dados: 31
Autores: Hedtrich,   Friedrich; Loy,   Jens-Peter; Muller,   Rolf A.E.
Seit geraumer Zeit haben "Prediction Markets", auch "Prognosemärkte" oder "InformationsMärkte" genannt, ihre Nützlichkeit bei der Prognose von Wahlergebnissen, der Vorhersage von Absatzzahlen, von Abschlussterminen von Entwicklungsprojekten und vielen anderen Ereignissen und Entwicklungen bewiesen. Die Vorhersage zukünftiger Entwicklungen in der Land und Ernährungswirtschaft hat mit der zunehmenden Integration der EUMärkte in die Weltmärkte zugenommen. Nach einer kurzen Darstellung des Vorhersagebedarfs im Agribusiness wird anschließend das Funktionsprinzip eines "Prediction Markets" dargestellt und am Beispiel eines Prototyps zur Vorhersage von Milchquotenpreisen in Deutschland veranschaulicht. Die Prognose von Milchquotenpreisen ist insbesondere vor dem...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Research Methods/ Statistical Methods; Prognosemärkte; Prognosemethoden; Agribusiness.
Ano: 2009
URL: http://purl.umn.edu/53274

Factors Influencing Artisanal Fisherfolks' Level of Support for Fishery Regulations: An Approach Using Alternative Ordered Logit Models
Provedor de dados: 31
Autores: Garcia,   Alexis Arthur B.; Rejesus,   Roderick M.; Genio,   Emmanuel L.
This article examines factors influencing fishers' decision to support fishery regulations in coastal communities in the Philippines. Using the partial proportional odds variant of the ordered logit model, we show that higher education levels, implementation of regulatory ordinances, and the effectiveness of law enforcement significantly affect the likelihood of supporting fishery regulations in coastal communities.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6791

Scope Economies of Lending and Collecting Deposits in Microfinance Institutions
Provedor de dados: 31
Autores: Hartarska,   Valentina M.; Parmeter,   Christopher F.
While economies of scope of lending and mobilizing deposits in banking are justified theoretically (Diamond, 1984) and found empirically (see Saunders, 1999), in microfinance, the existence and the magnitudes of scope economies has not been investigated. We use a semi parametric smooth coefficient model to estimate these economies using the largest publicly available dataset of over 2,800 annual observations from MFIs across the world. We accommodate the outreach objective of Microfinance Institutions (MFIs) by measuring outputs as the number of clients (borrowers and savers) rather than the traditional volume of loans and deposits and compare the results from the two cost functions. We find substantial scope economies of 47 percent on average. The results...
Tipo: Conference Paper or Presentation
Palavras-chave: Scope Economies; Microfinance Institutions; Rural Banks; Agricultural Finance; Financial Economics; International Development; Research Methods/ Statistical Methods; G21; F30; C14.
Ano: 2009
URL: http://purl.umn.edu/51799

Nonparametric Efficiency Analysis for Coffee Farms in Puerto Rico
Provedor de dados: 31
Autores: Gregory,   Alexandra; Featherstone,   Allen M.
Coffee production in Puerto Rico is labor intensive since harvest is done by hand for quality and topography conditions. Färe's nonparametric approach was used to estimate technical, allocative, scale and overall efficiency measures for coffee farms in Puerto Rico during the 2000 to 2004 period. On average Puerto Rico coffee farms were 46% technically efficient, 79% scale efficient, and 74% allocatively efficient.
Tipo: Conference Paper or Presentation
Palavras-chave: Coffee production; Nonparametric efficiency; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6765

ON THE INCLUSION OF NATURE AND ITS DYNAMICS IN FARMERS' OBJECTIVE FUNCTIONS FOR ECO-SYSTEM SERVICES PROVISION: A NEW STRATEGY IN BIO-ECONOMIC MODELING
Provedor de dados: 31
Autores: Nuppenau,   Ernst-August.
Because objectives influence behavior, there should be thoughtfulness of economists on stating objective functions. In contrast, most farm economists work with the assertion that farmers maximize income. A major question is, are there alternatives? It is the aim of this paper to get a deeper insight into deliberations on objective functions. We go beyond income maximization and show how a probabilistic approach on life-styles provides better insight. We suggest the use of probabilities, humans face if they do not know the status in which they live. Labor intensive and nature providing farming is contrasted with intensive, eco-system service extracting farming and put into a dynamic bio-economic approach. Life-styles occur with probability π and (1-π). The...
Tipo: Conference Paper or Presentation
Palavras-chave: Farm Management; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2008
URL: http://purl.umn.edu/6653

Modeling Non-Linear Spatial Dynamics: A Family of Spatial STAR Models and an Application to U.S. Economic Growth
Provedor de dados: 31
Autores: Pede,   Valerien O.; Florax,   Raymond J.G.M.; Holt,   Matthew T.
This paper investigates non-linearity in spatial processes models and allows for a gradual regime-switching structure in the form of a smooth transition autoregressive process. Until now, applications of the smooth transition autoregressive (STAR) model have been largely confined to the time series context. The paper focuses on extending the non-linear smooth transition perspective to spatial processes models, in which spatial correlation is taken into account through the use of a so-called weights matrix identifying the topology of the spatial system. We start by deriving a non-linearity test for a simple spatial model, in which spatial correlation is only included in the transition function. Next, we propose a non-linearity test for a model that includes...
Tipo: Conference Paper or Presentation
Palavras-chave: Spatial econometrics; Non-linearity; Utoregressive smooth transition; Research Methods/ Statistical Methods; C12; C21; C51; O18; R11.
Ano: 2008
URL: http://purl.umn.edu/6518

Should Surveys be Conducted Online or On Paper? A Comparison
Provedor de dados: 31
Autores: Hu,   Wuyang; Batte,   Marvin T.; Ernst,   Stanley C.; Woods,   Timothy A.
Internet consumer surveys have become increasingly popular in agricultural and food research. This study compares the results of an identical survey instrument implemented by mail and the Internet respectively. Aspects compared include survey logistics, timeline, costs, consumer demographic and socioeconomic features, observed univariate variables, and multivariate regression coefficient estimates and predictions. Results do reveal some differences in data collected by these two approaches. However, given the similarities between the two samples, the differences observed do not offer enough support to command either approach as superior to the other. It appears both methodologies can generate high quality data and are appropriate when used carefully.
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer; Internet Survey; Mailed Survey; Agribusiness; Consumer/Household Economics; Marketing; Research Methods/ Statistical Methods; C83; Q10.
Ano: 2010
URL: http://purl.umn.edu/61307

ROBUST ESTIMATORS OF ERRORS-IN-VARIABLES MODELS, PART 1
Provedor de dados: 31
Autores: Paris,   Quirino.
It is well known that consistent estimators of errors-in-variables models require knowledge of the ratio of error variances. What is not well known is that a Joint Least Squares estimator is robust to a wide misspecification of that ratio. Through a series of Monte Carlo experiments we show that an easy-to-implement estimator produces estimates that are nearly unbiased for a wide range of the ratio of error variances. These MC analyses encompass linear and nonlinear specifications and also a system on nonlinear equations where all the variables are measured with errors.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/11945

Generating global crop distribution maps: from census to grid
Provedor de dados: 31
Autores: You,   Liangzhi; Wood,   Stanley; Wood-Sichra,   Ulrike.
In order to evaluate food security, technology potential and the environmental impacts of production in a strategic and regional context, it is critical to have reliable information on the spatial distribution and coincidence of people, agricultural production, and environmental services. This paper proposes a spatial allocation model for generating highly disaggregated, crop-specific production data by a triangulation of any and all relevant background and partial information. This includes national or sub-national crop production statistics, satellite data on land cover, maps of irrigated areas, biophysical crop suitability assessments, population density, secondary data on irrigation and rainfed production systems, cropping intensity, and crop prices....
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21299

VALUE OF PREDICTORS OF UNCONTROLLED FACTORS IN RESPONSE FUNCTIONS
Provedor de dados: 31
Autores: Byerlee,   Derek R.; Anderson,   Jock R.
A method is developed for assessing the monetary value of additional information in the framework of a response process which involves interaction between controlled and uncontrolled factors. The method is illustrated through an analysis of the value of a rainfall predictor in determining optimal applications of nitrogen to wheat in an environment with variable rainfall. The analysis defines the conditions under which the predictor is most valuable and suggests types of predictors which may be of greater value.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1969
URL: http://purl.umn.edu/23001

Sustainable development level in rural China based on osculating value method
Provedor de dados: 31
Autores: Lu,   Bing-fu; Han,   Wei-ping.
This paper expounds the theoretical basis of rural sustainable development, sets up evaluation index system for rural sustainable development level in China, and uses the osculating value method to evaluate the rural sustainable development in cities, autonomous regions and provinces of China. They are divided into 3 grades of A, B and C according to the evaluation result. Finally, we analyze the causation of the differences of rural sustainable development among cities. autonomous regions and provinces in rural China.
Tipo: Thesis or Dissertation
Palavras-chave: Rural sustainable development; Osculating value; Evaluation; Empirical analysis; Agricultural Finance; Community/Rural/Urban Development; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53475

A szőlő rügyfakadási idejének becslése
Provedor de dados: 31
Autores: Hlaszny,   Edit; Ladanyi,   Marta.
Aszőlő rügyfakadási időpontjának modellezése és előrejelzése növényvédelmi és gazdasági szempontból nélkülözhetetlen lépés a szőlőtermelésben. Tanulmányunkat öt fehérborszőlő-fajta (Chardonnay, Rajnai rizling, Hárslevelű, Pinot blanc és Szürkebarát), valamint ezek klónfajtáinak 2000 és 2004 között felvételezett adataival végeztük. Az ültetvények a Duna borrégión belül, a Kunsági borvidékhez tartozó Helvécián találhatóak. Számításainkhoz egy olyan matematikai modellt állítottunk fel, mely kis hibával megbecsüli a várható rügyfakadás napját. Amodell az általánosan használt kumulált hőösszegszámításon alapul, az optimalizálást pedig a becsült időpontok napokban számított hibájára végeztük. Az optimális bázishőmérsékletet 6 °C-ban állapítottuk meg. Amodell...
Tipo: Journal Article
Palavras-chave: Rügyfakadás; Tenyészidő effektív hőösszege; Vitis vinifera L.; Opening of buds; Effective accumulated temperatureover the growing season; Vitis vinifera L.; Crop Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/99196

REVIEW OF SOME OPERATIONAL PROCEDURES TO INCORPORATE EQUITY OBJECTIVES IN PROJECT APPRAISAL
Provedor de dados: 31
Autores: Jones,   John M.
In recent years there has been a growing interest in the development of methodologies related to the formulation and appraisal of projects.  This is reflected in an increasing number of scientific papers and courses offered at different levels on the subject, most of which are directed for application in less developed countries.  A wide variety of institutions are contributing in different ways to this development.  Resulting from this interest, several operational procedures have been suggested which enable the analyst to perform financial as well as social appraisal of projects, where financial refers specifically to appraisal for the private and/or public participants in the project, and social refers to analysis from the perspective of economy-wide...
Tipo: Thesis or Dissertation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1979
URL: http://purl.umn.edu/11181

Error–correction–based cointegration tests for panel data
Provedor de dados: 31
Autores: Persyn,   Damiaan; Westerlund,   Joakim.
This article describes a new Stata command called xtwest, which implements the four error-correction–based panel cointegration tests developed by Westerlund (2007). The tests are general enough to allow for a large degree of heterogeneity, both in the long-run cointegrating relationship and in the short-run dynamics, and dependence within as well as across the cross-sectional units.
Tipo: Article
Palavras-chave: Xtwest; Panel cointegration test; Common-factor restriction; Cross-sectional dependence; Health-care expenditures; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122588

Spatial Price Adjustment with and without Trade
Provedor de dados: 31
Autores: Stephens,   Emma C.; Mabaya,   Edward T.
In this paper we introduce a switching error correction model (SECM) estimator that allows for the possibility that price transmission between markets might vary during periods with and without physical trade flows. Applying this new approach to semi-weekly data on tomato markets in Zimbabwe, we find that intermarket price adjustment occurs quickly and as much when there is no trade as when product flows from one market to another. This finding underscores the importance of information flow for market performance.
Tipo: Conference Paper or Presentation
Palavras-chave: Marketing; Research Methods/ Statistical Methods; Q13; R12; C32; P42.
Ano: 2008
URL: http://purl.umn.edu/6538

AN ANALYSIS OF ALTERNATIVE NET PRESENT VALUE CAPITAL INVESTMENT DECISION MODELS
Provedor de dados: 31
Autores: Bradford,   Garnett L.; Miller,   Stephen E.
We have found that the disagreement between Returns-to-Assets (RTA) and Returns-to-Equity (RTE) proponents is not confined to agricultural economics.  Depending on the course they are taking and the accompanying text, students are likely to learn that there is a "right" way to calculate Net Present Values (NPVs), either by the RTA method or the RTE method.  In most cases, only one of the two methods is discussed and illustrated with numerical examples.  Less common are texts that compare the two methods, discuss their underlying assumptions, or show how the NPVs from the two methods can be reconciled. The paper is organized as follows.  The first section of the main body of the paper provides a comparative overview of the RTA and RTE methods; the second...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/18804

User's Guide to BENCOS Lotus 1-2-3 Templates for Benefit-Cost Analysis
Provedor de dados: 31
Autores: Crawford,   Eric W.; Schmid,   A. Allan.
BENCOS is a Lotus 1-2-3 template designed for benefit-cost analysis. This document  describes the structure and capabilities of BENCOS, followed by instructions on how to use the  template, and comments on possible modifications of the template.
Tipo: Report
Palavras-chave: Food security; Food policy; BENCOS Lotus 1-2-3 templates; Research Methods/ Statistical Methods; Downloads December 2008-June 2009: 10; C88.
Ano: 1990
URL: http://purl.umn.edu/54734

Boosted regression (boosting): An introductory tutorial and a Stata plugin
Provedor de dados: 31
Autores: Schonlau,   Matthias.
Boosting, or boosted regression, is a recent data-mining technique that has shown considerable success in predictive accuracy. This article gives an overview of boosting and introduces a new Stata command, boost, that implements the boosting algorithm described in Hastie, Tibshirani, and Friedman (2001, 322). The plugin is illustrated with a Gaussian and a logistic regression example. In the Gaussian regression example, the R2 value computed on a test dataset is R2 = 21.3% for linear regression and R2 = 93.8% for boosting. In the logistic regression example, stepwise logistic regression correctly classifies 54.1% of the observations in a test dataset versus 76.0% for boosted logistic regression. Currently, boost accommodates Gaussian (normal), logistic,...
Tipo: Journal Article
Palavras-chave: Boost; Boosted regression; Boosting; Data mining; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117524

Exploring the use of variable bandwidth kernel density estimators
Provedor de dados: 31
Autores: Salgado-Ugarte,   Isaias H.; Perez-Hernandez,   Marco A.
Variable bandwidth kernel density estimators increase the window width at low densities and decrease it where data concentrate. This represents an improvement over the fixed bandwidth kernel density estimators. In this article, we explore the use of one implementation of a variable kernel estimator in conjunction with several rules and procedures for bandwidth selection applied to several real datasets. The considered examples permit us to state that when working with tens or a few hundreds of data observations, least-squares cross-validation bandwidth rarely produces useful estimates; with thousands of observations, this problem can be surpassed. Optimal bandwidth and biased cross-validation (BCV), in general, oversmooth multimodal densities. The...
Tipo: Journal Article
Palavras-chave: Kernel density estimation; Bandwidth; Cross validation; Multimodality test; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116063

USER'S GUIDE FOR MINNLP
Provedor de dados: 31
Autores: Fuller,   Earl I.
The code MINNLP, or Minnesota Linear Programming, is an interactive linear programming algorithm which is efficient in the use of computer storage space and computational time. It is also easy to use and contains matrix modification options.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1981
URL: http://purl.umn.edu/14126

ON THE CHOICE OF FUNCTIONAL FORMS IN THE MEASUREMENT OF SCALE AND SCOPE ECONOMIES: GENERALIZED BOX-COX AND COMPOSITE COST FUNCTIONS
Provedor de dados: 31
Autores: Ogunyinka,   Ebenezer; Featherstone,   Allen M.
This paper estimates and compares generalized Box-Cox and composite cost functions to identify scale and scope economies.  The robustness of the outcomes to different functional specifications was examined.  Increasing returns to scale was common for product-specific and the overall measures. Generalized Leontief and composite forms yielded more robust elasticity, scale and scope measures. The generalized Box-Cox model was selected as the appropriate functional form as all the special cases were rejected.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35057

A CAUTIONARY NOTE ON POLYNOMIAL DISTRIBUTED LAG FORMULATIONS OF SUPPLY RESPONSE
Provedor de dados: 31
Autores: Azzam,   Azzeddine M.; Yanagida,   John F.
This paper uses the Pagano-Hartley procedure to estimate the lag length and polynomial degree for the case of a quarterly hog supply equation. The results show that the nicely humped shapes which materialize when using the Almon lag may be caused by the failure in accounting for autocorrelation in determining lag length and polynominal degree.
Tipo: Journal Article
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/32471

Time Varying Coefficient: An Application of Flexible Least Squares to Cattle Captive Supply
Provedor de dados: 31
Autores: Kim,   Man-Keun; Lee,   Andrew C.
Although conventional linear regression techniques assume time constancy of parameters time varying coefficient or the problem of structural instability in econometric relationships has been recognized by econometricians.  In this study, time varying impact of captive supply on fed cattle cash market price is investigated via flexible least squares approach.  Time path of flexible least squares coefficient estimate indicates an approximately four fold increase in price impact of captive supply over the sample period, but even this multiplied price impact is small compared to the effect of boxed beef price which shows negligible time variation.  The time path also aids in identification of structural breaks in the price impact of captive supply.
Tipo: Conference Paper or Presentation
Palavras-chave: Time varying coefficient; Flexible least squares; Structural break; Captive supply; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19124

A Microcomputer Model for Assessing Socioeconomic Impacts of Development Projects
Provedor de dados: 31
Autores: Leistritz,   F. Larry; Coon,   Randal C.; Hamm,   Rita R.
Tipo: Technical Report
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/121072

BIOECONOMICS OF REGULATING NITRATES IN GROUNDWATER: TAXES, QUANTITY RESTRICTIONS, AND POLLUTION PERMITS
Provedor de dados: 31
Autores: Thomas,   Arthur C.; Boisvert,   Richard N.
Soil specific, chance constrained, dynamic models of agricultural production and nitrate leaching are developed to assess the impacts of nitrogen fertilizer taxes, quantity restrictions on fertilizer or leachate, and leachate permits. A programming model uses the solutions of these bioeconomic models to determine regional impacts of the regulations.
Tipo: Working or Discussion Paper
Palavras-chave: Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/6850

MARKOV CHAINS: BASIC CONCEPTS AND SUGGESTED USES IN AGRICULTURAL ECONOMICS
Provedor de dados: 31
Autores: Judge,   George G.; Swanson,   E.R.
Agricultural economists are often interested in characterizing or summarizing how economic processes and institutions have changed through time as well as what paths they are likely to take in future time periods. Given this interest or objective, we are therefore interested in methods of analysis that will accomplish these purposes and that are simple to apply. Within this context the major purpose of this paper is to discuss the concept of a Markov chain process and to indicate its potential usefulness in analyzing problems where detailed time-ordered data exist over some time span. As a particular vehicle for the discussion, a limited example concerning the past and potential size distribution of a sample of hog-producing firms in central Illinois will...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1962
URL: http://purl.umn.edu/22465

ESTIMATING NON-PARAMETRIC AND PARAMETRIC TRANSFORMATION FUNCTIONS FROM SURVEY DATA: AN APPLICATION OF MINIMUM CROSS-ENTROPY
Provedor de dados: 31
Autores: Hoveid,   Oyvind.
A model of a (convex) technology of representative and non-representative firms in a heterogeneous sector is presented in non-parametric and parametric versions.  The heterogeneity is specified with error terms.  The models including a non-parametric distribution of the errors can be estimated with entropy econometrics from firm survey data.  This requires two important modifications in the standard approach to entropy estimation of Golan, Judge and Miller: The compact support of the probability distribution should be designed to capture eventual non-zero covariance.  And cross-entropy need to be redefined for cases of multiple observations.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21851

Bestimmung der Determinanten der Rapspreisentwicklung in der Hochpreisphase auf Basis von Markovzeitreihenmodellen
Provedor de dados: 31
Autores: Busse,   Stefan; Brümmer,   Bernhard.
Der Einfluss der Entwicklungen auf verschiedenen Agrarmärkten auf den deutschen Rapsmarkt wird im vorliegenden Beitrag anhand von multivariaten Zeitreihenmodellen für die Produktpreise untersucht. Da sich in Hochpreisphasen die Preisanpassungsprozesse möglicherweise im Vergleich zu Phasen niedriger Preise ändern, wird auf ein nichtlineares Vektor-Fehlerkorrektur-Modell (VFKM) zurückgegriffen, das regimeabhängige Anpassungen zulässt. Die Spezifikation des Modells als Markovsprung-VFKM (MS-VFKM) erweist sich hier als vorteilhaft, da es keiner a priori Regimespezifizierung und -abgrenzung bedarf. Die Analyse zeigt, dass in den Jahren 2007/08 signifikante Änderungen in den Anpassungsprozessen der Rapspreise im Verhältnis zu anderen Agrargütern auftraten, wobei...
Tipo: Conference Paper or Presentation
Palavras-chave: Markovsprung-Vektor-Fehlerkorrektur-Modell; Regimeabhängiges Verhalten; Rapsmarkt; Hochpreisphase; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53271

A note on the concordance correlation coefficient
Provedor de dados: 31
Autores: Steichen,   Thomas J.; Cox,   Nicholas J.
Program concord implements L. I. Lin’s concordance correlation coefficient (Lin 1989), as well as the limits-of-agreement procedure (Bland and Altman 1986). Recently, Lin (2000) issued an erratum reporting a number of typographical errors in his seminal 1989 paper. Further, changes in Stata Version 7 required modification of concord. This note reports the effect of the errors and provides a corrected and updated program.
Tipo: Journal Article
Palavras-chave: Concordance correlation; Graphics; Measurement comparison; Limits-of-agreement; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115960

RISK ANALYSIS UNDER CORRELATED, NON-NORMAL PRICE AND YIELD PROBABILITY DISTRIBUTIONS
Provedor de dados: 31
Autores: Ramirez,   Octavio A.; Sosa,   Romeo.
Recently developed techniques are combined for modeling mutually correlated crop yields and prices that exhibit heteroscedasticity and autocorrelation, respectively, and follow non-normal probability density functions (pdf's). The importance rigorously modeling these pdf's for financial risk analysis is illustrated through a case study of tropical agroforestry systems for coffee production.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/21888

Dairy Quota and Farm Structural Change: A Case Study on the Netherlands
Provedor de dados: 31
Autores: Jongeneel,   Roelof A.; Tonini,   Axel.
This paper sets out to analyse the impact of milk quotas had on the dairy farm structure of the Netherlands. In addition projections on the likely farm structure under different milk quota scenarios are explored. Moreover mobility indicators characterizing structural change are developed and calculated. A Markov probability model is estimated relying on a generalized cross entropy approach. The introduction of milk quotas as of April 1, 1984 froze the dairy farm structural adjustment, at least initially. However, later on mobility started to increase, which is likely to reflect the quota tradability and lease possibilities. Moreover there is evidence that the milk quota regime has increased concentration of dairy production among farms with 50-69 cows. If...
Tipo: Conference Paper or Presentation
Palavras-chave: Dairy; Farm size; Netherlands; Markov chain; Generalized cross entropy; Agricultural and Food Policy; Farm Management; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6692

ISSUES IN NONMARKET VALUATION AND POLICY APPLICATION:  A RETROSPECTIVE GLANCE
Provedor de dados: 31
Autores: Walsh,   Richard G.; Johnson,   Donn M.; McKean,   John R.
While issues in estimating nonmarket values continue to cause concern, resource economists have more reason now than ever before to be optimistic.  More progress toward improved measurement has been made in the past six years than in the previous quarter century since development of the contingent valuation and travel cost methods.  The new challenge is to learn how to adjust past studies to estimate nonmarket values for future policy analysis.  The process involves developing an understanding of the important variables that explain the observed difference in estimates.  This paper illustrates how the results thus far could be adjusted to develop some tentative estimates of the recreation-use value of Forest Service resources.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1989
URL: http://purl.umn.edu/32446

Using panel data to estimate the effect of rainfall shocks on smallholders food security and vulnerability in rural Ethiopia
Provedor de dados: 31
Autores: Demeke,   Abera Birhanu; Zeller,   Manfred.
Ethiopia's agriculture is predominantly rainfed and hence any irregularity in weather conditions has adverse welfare implications. Using panel data, this paper analyzes the effect of rainfall shocks on Ethiopian rural households' food security and vulnerability over time while controlling for a range of other factors. To this end, we generated a time-variant household food security index which is developed by principal components analysis. Based on the scores of the index, households were classified into relative food security groups and their socioeconomic differences were assessed. The exploratory results show that compared to the less secured households, the more secured ones have male and literate household heads, tend to have a greater number of...
Tipo: Working or Discussion Paper
Palavras-chave: Food security; Principal components analysis; Rainfall; Panel data; Ethiopia; Food Security and Poverty; Research Methods/ Statistical Methods; Q18; C13.
Ano: 2009
URL: http://purl.umn.edu/57994

AN ANALYSIS OF STATISTICAL ERRORS IN CONTINGENT VALUATION SURVEYS
Provedor de dados: 31
Autores: Dietz,   Brian.
Environmental economists using contingent valuation (CV) surveys are often interested in estimating the population willingness to pay (WTP) for some intervention from a sample of individuals randomly drawn from some population of interest.  These surveys collect information on bids or WTP amounts and various demographic and socioeconomic characteristics about the respondents that is used to estimate descriptive statistics (such as mean or median WTP) or regression equations (such as bid or WTP functions).  Statistical errors can occur when either the framework from which the sample was drawn is ignored or when the sampled elements are used to incorrectly infer relationships for a target.  These errors will often cause biased WTP estimates, although the...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/20462

PRODUCTIVITY AND EFFICIENCY OF AGRICULTURAL AND NON AGRICULTURAL BANKS IN THE UNITED STATES: DEA APPROACH
Provedor de dados: 31
Autores: Dias,   Weeratilake.
Efficient operation of agricultural credit markets is very important both for the producer as well as for the policy makers.  DEA approach is used to calculate productivity analysis which allows decomposition of sources of productivity changes into efficiency and technical change.  Measured efficiencies are comparable to most recent parametric studies.
Tipo: Conference Paper or Presentation
Palavras-chave: Financial Economics; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20845

REVISITING ERROR AUTOCORRELATION CORRECTION: COMMON FACTOR RESTRICTIONS AND GRANGER CAUSALITY
Provedor de dados: 31
Autores: McGuirk,   Anya M.; Spanos,   Aris.
This paper demonstrates that linear regression models with an AR(1) error structure implicitly assume that y{t} does not Granger cause any of the exogenous variables in X{t}. An indirect test of the common factor restrictions based on this Granger non-causality is proposed and shown to outperform existing tests.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20176

PLANT LOCATION ANALYSIS USING DISCRETE STOCHASTIC PROGRAMMING
Provedor de dados: 31
Autores: Brown,   Colin G.; Drynan,   Ross G.
A plant location model with two major aspects is outlined. First, discrete stochastic programming is used to handle variability in supplies and demands. Second, the cost structure of plants is modelled in more detail and with more realism than is usual. Results from applying the model to the Queensland cattle slaughtering industry demonstrate the inappropriateness of using traditional deterministic plant location models to analyse problems with major stochastic elements. Deterministic models yield plant locations, sizes, throughputs, commodity flows and implications which differ markedly from those generated by stochastic models in which plant sizes and locations are optimally matched to variable fat cattle supplies. In addition, the traditional...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/22876

Estimating the Net Economic Value of National Forest Recreation: An Application of the National Visitor Use Monitoring Database.
Provedor de dados: 31
Autores: Bowker,   James Michael; Starbuck,   C. Meghan; English,   Donald B.K.; Bergstrom,   John C.; Rosenberger,   Randall S.; McCollum,   Daniel W.
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/59603

A DYNAMIC ANALYSIS OF PRICE DETERMINATION UNDER JOINT PROFIT MAXIMIZATION IN BILATERAL MONOPOLY
Provedor de dados: 31
Autores: Devadoss,   Stephen.
This study provides a dynamic mathematical treatment of price determination under bilateral monopoly.  The results are: a) a quantitiative solution for the equilibrium price; b) equality of profits of the buyer and seller; c) dynamically stable equilibrium price; and d) the bargaining process achieves the equilibrium price at a faster pace for larger value of the quantity.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20809

CAUSALITY BETWEEN TFP, R&amp;D AND PRICES: UNCONDITIONAL AND CONDITIONAL LINEAR FEEDBACK
Provedor de dados: 31
Autores: Shaik,   Saleem.
This paper estimates the unconditional and conditional linear dependence between exogenous supply (R&amp;D), endogenous demand (prices) and TFP based on the linear feedback method.  Unit root tests are performed for Nebraska agriculture sector data spread over 1936-94 time period. Results indicate the influence of both R&amp;D and prices on productivity.
Tipo: Conference Paper or Presentation
Palavras-chave: Linear Feedback; Causality; Productivity; R&amp;D; Prices; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21584

FLEXIBLE DISTRIBUTED LAGS
Provedor de dados: 31
Autores: Chotikapanich,   Duangkamon; Griffiths,   William E.
In econometrics there is a long history of using continuous functions to force distributed lag coefficients to behave in an economically accepted way. For example, geometrically declining lags have often been used to model coefficients that we believe should be declining. Polynomial lags have been used to model lag coefficients expected to increase and then decrease. In this paper a more flexible way of imposing such prior information is investigated. Inequality constraints are used to impose knowledge about the relative magnitudes of coefficients without forcing them to lie on a smooth continuous curve. A Metropolis algorithm is used to get posterior density functions for the lag coefficients and functions of those coefficients for the Nerlove orange data...
Tipo: Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/123623

HYPOTHESIS TESTING USING NUMEROUS APPROXIMATING FUNCTIONAL FORMS
Provedor de dados: 31
Autores: Norwood,   F. Bailey; Lusk,   Jayson L.; Ferrier,   Peyton Michael.
While the combination of several or more models is often found to improve forecasts (Brandt and Bessler, Min and Zellner, Norwood and Schroeder), hypothesis tests are typically conducted using a single model approach 1 . Hypothesis tests and forecasts have similar goals; they seek to define a range over which a parameter should lie within a degree of confidence. If it is true that, on average, composite forecasts are more accurate than a single model's forecast, it might also be true that hypothesis tests using information from numerous models are, on average, more accurate in the sense of lower Type I and Type II errors than hypothesis tests using a single model.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/18964

CONFIRMATION AND FALSIFICATION OF EQUILIBRIUM DISPLACEMENT MODELS
Provedor de dados: 31
Autores: Davis,   George C.
One of the most important principles in any science is testing and consequently confirmation and falsification.  In agricultural economics, the equilibrium displacement model is a popular modeling approach that presently is not testable and consequently cannot be confirmed or falsified.  This paper presents four increasingly sophisticated procedures designed to overcome this limitation of equilibrium displacement models.  An empirical illustration demonstrates the usefulness of these procedures in deciding between three alternative and theoretically viable equilibrium displacement models.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/20525

THE COMMON AGRICULTURAL POLICY IN MULTISECTORAL MODELS
Provedor de dados: 31
Autores: de Muro,   Pasquale; Salvatici,   Luca.
The paper reviews the multisectoral models used in the last 10 years to analyse the effects of the Common Agricultural Policy. It begins with a presentation of the theoretical structure of computable general equilibrium models, including both single-region and multi-region models. In this respect, the paper deals with the questions of disaggregation of commodities, households, regions and factors of production, as well as the issues of parameter specification and model closure. The paper then turns to the problems of modelling policies which are included in the present CAP. Firstly, there is the issue of the linkages between institutional and market prices. Secondly, there is the issue of decoupled or semi-decoupled direct payments. Thirdly, there are...
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/14804

Bridging the Gap Between Theory and Practice in Integrated Assessment
Provedor de dados: 31
Autores: Lee,   Norman.
There is growing support for the use of integrated assessments (IAs)/sustainability impact assessments (SIAs), at different government levels and geographic scales of policy-making and planning, both nationally and internationally. However, delivering good quality IAs/SIAs, in the near future, could be challenging. This paper mainly focuses upon one area of concern, differences between research and other technical contributions intended to strengthen assessment methodologies and the types of assessment methods considered usable by practitioners. To help in addressing this concern, the development of a common assessment framework is proposed, which is based on a shared, practitioner-researcher-stakeholder understanding of what constitutes a satisfactory...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/30575

Sample Size and Robustness of Inferences from Logistic Regression in the Presence of Nonlinearity and Multicollinearity
Provedor de dados: 31
Autores: Bergtold,   Jason S.; Yeager,   Elizabeth A.; Featherstone,   Allen M.
The logistic regression models has been widely used in the social and natural sciences and results from studies using this model can have significant impact. Thus, confidence in the reliability of inferences drawn from these models is essential.  The robustness of such inferences is dependent on sample size. The purpose of this study is to examine the impact of sample size on the mean estimated bias and efficiency of parameter estimation and inference for the logistic regression model. A number of simulations are conducted examining the impact of sample size, nonlinear predictors, and multicollinearity on substantive inferences (e.g. odds ratios, marginal effects) and goodness of fit (e.g. pseudo-R2, predictability) of logistic regression models. Findings...
Tipo: Conference Paper or Presentation
Palavras-chave: Logistic Regression Model; Multicollinearity; Nonlinearity; Robustness; Small Sample Bias; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103771

INVESTIGATING THE ECONOMIC AND WATER QUALITY EFFECTS OF THE 2003 CAP REFORM ON ARABLE CROPPING SYSTEMS: A SCOTTISH CASE STUDY
Provedor de dados: 31
Autores: Mouratiadou,   Ioanna; Russell,   Graham; Topp,   Cairistiona; Louhichi,   Kamel.
The 2003 Common Agricultural Policy Reform aimed to promote the socio-economic and environmental sustainability of agricultural systems. An important question is how far the Reform has indeed encouraged farmers to contribute to achieving broad economic and environmental goals. The economic and water resource effects of the Reform have been explored for the case study area of the Lunan catchment, which is typical of Scottish arable cropping areas. Land use data analysis, bio-physical modelling and bio-economic modelling were used in combination to identify the effects of a range of scenarios. The results indicate only small changes in the cropping pattern and associated economic and water quality indicators as a result of the Reform, with the main changes...
Tipo: Conference Paper or Presentation
Palavras-chave: Common Agricultural Policy; Bio-economic modelling; Water; Land use; Scotland.; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q10; Q18; Q25.
Ano: 2008
URL: http://purl.umn.edu/44797

Two Algorithms for Solving the Walrasian Equilibrium Inequalities
Provedor de dados: 31
Autores: Brown,   Donald J.; Kannan,   Ravi.
We propose two algorithms for deciding if the Walrasian equilibrium inequalities are solvable.  These algorithms may serve as  nonparametric tests for multiple calibration of applied general equilibrium models or they can be used to compute counterfactual equilibria in applied general equilibrium models defined by the Walrasian equilibrium inequalities.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/28443

DISCRETE STOCHASTIC SEQUENTIAL PROGRAMMING: A PRIMER
Provedor de dados: 31
Autores: Apland,   Jeffrey; Kaiser,   Harry M.
The purpose of this paper is to present an overview of discrete stochastic sequential programming and to illustrate the technique through a numerical example. The application of the technique to empirical problems involving decision making will be briefly discussed and an empirical application will be summarized.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/13545

A NOTE ON THE VIABILITY OF RAINFALL INSURANCE - REPLY
Provedor de dados: 31
Autores: Bardsley,   Peter.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/22880

Jackknife instrumental variables estimation in Stata
Provedor de dados: 31
Autores: Poi,   Brian P.
The two-stage least-squares (2SLS) instrumental variables estimator is commonly used to address endogeneity. However, the estimator suffers from bias that is exacerbated when the instruments are only weakly correlated with the endogenous variables and when many instruments are used. In this article, I discuss jackknife instrumental variables estimation as an alternative to 2SLS. Monte Carlo simulations comparing the jackknife instrument variables estimators to 2SLS and limited information maximum likelihood (LIML) show that two of the four variants perform remarkably well even when 2SLS does not. In a weak-instrument experiment, the two best performing jackknife estimators also outperform LIML.
Tipo: Journal Article
Palavras-chave: Jive; 2SLS; LIML; JIVE; Instrumental variables; Endogeneity; Weak instruments; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117586

Pricing Perishables
Provedor de dados: 31
Autores: Weaver,   Robert D.; Moon,   Yongma.
A key feature of food products is their perishability. Within the short marketing window that characterizes most food and ag products, demand is typically highly stochastic and difficult to predict. This combination of features poses substantial challenges to retailers when pricing products and has implications for performance that ripples through vertical food chains. For many food products, processing to forms that can be preserved and held in inventory has traditionally been used as a means of coping with these conditions, despite its high costs and ancillary risks introduced such as change in product attributes and deterioration. This paper presents an alternative ERM strategy that focuses on dynamic pricing to control the rate of sale for perishable...
Tipo: Presentation
Palavras-chave: Dynamic pricing; Demand substitution; Consumer choice model; Robust optimization; Price assurance.; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/122007

Comparative assessment of three common algorithms for estimating the variance of the area under the nonparametric receiver operating characteristic curve
Provedor de dados: 31
Autores: Cleves,   Mario A.
The area under the receiver operating characteristic (ROC) curve is often used to summarize and compare the discriminatory accuracy of a diagnostic test or modality, and to evaluate the predictive power of statistical models for binary outcomes. Parametric maximum likelihood methods for fitting of the ROC curve provide direct estimates of the area under the ROC curve and its variance. Nonparametric methods, on the other hand, provide estimates of the area under the ROC curve, but do not directly estimate its variance. Three algorithms for computing the variance for the area under the nonparametric ROC curve are commonly used, although ambiguity exists about their behavior under diverse study conditions. Using simulated data, we found similar asymptotic...
Tipo: Journal Article
Palavras-chave: Receiver operating characteristic (ROC) curve; Trapezoidal rule; Sensitivity; Specificity; Discriminatory accuracy; Predictive power; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116008

Policy and Institutional effects on market participation by smallholder rice farmers: case studies in Burkina Faso, Mali and Niger
Provedor de dados: 31
Autores: Toure,   Ali; Bamba,   Ibrahim; Diagne,   Aliou; Harouna,   Kore; Cisse,   Youssouf; Kabore,   Daniel.
Rice sector contributes significantly to secure households with regard to their food needs but also to the creation of employments and income generation. The sector development and its evolution over the years have been marked by various policies and approaches. These development stages of the sector constitute nothing but the impact of the number of factors such as the rice policies put in place. A collaborative multi-country pilot study on policy and institutional arrangements effects on irrigated rice production and commercialization was conducted by WARDA and its country partners of Burkina Faso, Mali, and Niger. In-depth surveys were carried out at both village and household levels to collect qualitative and quantitative data on irrigated rice...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Labor and Human Capital; Marketing; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/52097

Stata tip 52: Generating composite categorical variables
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119296

Evaluating Sustainable Competitive Advantages in Brazilian and U.S. Processed Citrus Supply Chains: An Application of Porter’s Diamond Framework
Provedor de dados: 31
Autores: Sterns,   James A.; Spreen,   Thomas H.
The processed citrus industries of Sao Paulo, Brazil and Florida, United States collectively account for over 80 percent of world orange juice production. In recent years, both industries have been confronted with serious plant disease outbreaks. Porter’s Diamond framework is used to assess the strengths and weakness of the processed citrus industry in each country to confront the combined challenge of effectively combating these diseases while maintaining market competitiveness. Although Sao Paulo and Florida produce a similar product, the Porter’s Diamond framework reveals that there are significant differences in the organizational structure of the two industries. The article concludes with an analysis of how these differences will impact each...
Tipo: Journal Article
Palavras-chave: Orange juice; Porter’s diamond; Competitive advantage; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/97233

Does consistent aggregation really matter?
Provedor de dados: 31
Autores: Shumway,   C. Richard; Davis,   George C.
Consistent aggregation ensures that behavioural properties which apply to disaggregate relationships apply also to aggregate relationships. The agricultural economics literature which has tested for consistent aggregation or measured statistical bias and/or inferential errors due to aggregation is reviewed. Tests for aggregation bias and errors of inference are conducted using indices previously tested for consistent aggregation. Failure to reject consistent aggregation in a partition did not entirely mitigate erroneous inference due to aggregation. However, inferential errors due to aggregation were small relative to errors due to incorrect functional form or failure to account for time series properties of data.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/117388

The impact of property rates on agricultural land, focusing on the Free State
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005.  This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58070

Perception of Innovative Crop Insurance in Australia
Provedor de dados: 31
Autores: Meuwissen,   Miranda P.M.; Molnar,   Tams A.
Worldwide, extreme climate risks cause stakeholders in food supply chains to search for new risk management tools. In Australia, recently so‐called crop yield simulation insurance has been introduced based on an integrated agrometeorological simulation model. Current uptake is relatively low, possibly because Australian farmers perceive commodity price risk as more important than climate risk. Also, they perceive risk management tools such as water management and diversification as more important than buying crop insurance. Still, opportunities seem to exist for new insurance products, such as crop yield simulation insurance, as indicated by farmers’ interest into such products. Outcomes are useful in worldwide discussions on risk management opportunities...
Tipo: Conference Paper or Presentation
Palavras-chave: Crop yield simulation; Yield insurance; Wheat farmers; Personal interviews; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100505

Estimation of average treatment effects based on propensity scores
Provedor de dados: 31
Autores: Becker,   Sascha O.; Ichino,   Andrea.
In this paper, we give a short overview of some propensity score matching estimators suggested in the evaluation literature, and we provide a set of Stata programs, which we illustrate using the National Supported Work (NSW) demonstration widely known in labor economics.
Tipo: Journal Article
Palavras-chave: Propensity score; Matching; Average treatment effect; Evaluation; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116022

Compensation Method and Rational Standard of Arable Land Expropriation
Provedor de dados: 31
Autores: Xue,   Mingchuan.
This paper discusses the problems in determining the compensational money of arable land expropriation by Income Capitalization Method and Market Comparative Method during the process of arable land expropriation. It also introduces the value composition of arable land in China. Taking Chongqing City as an example, the irrationality of compensation standard in current arable land expropriation is analyzed. Result shows that the Income Capitalization Method is rational in determining the compensational money, but the current compensation standard should be further improved.
Tipo: Thesis or Dissertation
Palavras-chave: Land exploration compensation; Method; Standard; Calculation; China; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53519

El uso de categorías étnico/raciales en censos y encuestas en el Perú: balance y aportes para una discusión
Provedor de dados: 31
Autores: Valdivia,   Nestor.
En América Latina existe consenso en la necesidad de avanzar hacia la “visibilización” de los grupos indígenas y afrodescendientes para identificar sus problemas y necesidades, brindarles el reconocimiento debido y otorgarles un papel protagónico en las decisiones relacionadas a su propio desarrollo. En este contexto, en los países de la región se ha avanzado en la incorporación de variables étnicas en los censos nacionales y los registros administrativos del Estado.   El presente trabajo analiza el caso del Perú y establece un balance de las iniciativas implementadas desde el Estado y el mundo académico para incorporar la dimensión étnica en los instrumentos cuantitativos usados para el análisis de la realidad social peruana.   El objetivo de este balance...
Tipo: Working Paper
Palavras-chave: Grupos étnicos; Raza; Negros; Afroperuanos; Población indígena; Censos; Encuesta de hogares; Perú; Ethnic groups; Race; Blacks; Indigenous population; Censuses; Householdd surveys; Peru; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/119422

Study of Evacuation Behavior of Coastal Gulf of Mexico Residents
Provedor de dados: 31
Autores: Bhattacharjee,   Sanjoy; Petrolia,   Daniel R.; Hanson,   Terrill R.
In this study, we investigate the link between hurricane characteristics, demographics of the Coastal Gulf of Mexico residents, including their household location, and their respective evacuation behavior. Our study is significantly different from the previously made studies on hurricane evacuation behavior in two ways. At first, the research data is collected through recording responses to a series of hypothetical situations which are quite identical to the set of information that people are used to see during the hurricane season. Secondly, this study addresses and includes response heterogeneity while analyzing sample behavior, an issue which has not been addressed in previous research on hurricane evacuation behavior in spite of its importance.
Tipo: Conference Paper or Presentation
Palavras-chave: Evacuation Behavior; Hurricane; Response Heterogeneity; Environmental Economics and Policy; Research Methods/ Statistical Methods; Risk and Uncertainty; C35; Q54.
Ano: 2009
URL: http://purl.umn.edu/46845

FOCUS GROUPS AS A USEFUL APPROACH TO AGRIBUSINESS RESEARCH
Provedor de dados: 31
Autores: Sterns,   James A.; Ricks,   Donald J.
As the agricultural economics profession increasingly strives to find relevant and useful approaches for addressing a broad array of research questions, particularly in terms of agribusiness research, there will be a growing need to adopt a wide set of research methods and methodologies. Historical research strategies typically emphasized by agricultural economists have focused primarily on surveys, archival/secondary data and econometrics.  However, these approaches are, at times, limited in their applicability and scope relative to some of the research questions that have the greatest priority for agribusiness researchers and their clientele. Some of the research methods now being more widely used by agribusiness-oriented agricultural economists are more...
Tipo: Working or Discussion Paper
Palavras-chave: Agribusiness; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/11626

Memories of Stata
Provedor de dados: 31
Autores: Lachenbruch,   Tony.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117495

Mata Matters: Structures
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. In the Mata Matters column, we show how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. Structures are the subject of this column. Structures are an advanced programming technique that can greatly simplify complicated code.
Tipo: Article
Palavras-chave: Mata; Structures; Struct; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119294

Traceability and Demand Sensitiveness: Evidences from Italian Fresh Potatoes Consumption
Provedor de dados: 31
Autores: Caracciolo,   Francesco; Cembalo,   Luigi.
When a traceability system takes place, either when mandatory or voluntary, many questions arise that need to be addressed and answered. One of the firsts concerns whether it introduces new costs with no gain in efficiency or, on the contrary, the system efficiency increases lowering costs and, as a consequence, market price of the good in hand. Among others, another issue that only rarely is addressed regards the effect of a price change on the final market. The objective of this paper was to simulate the effect on fresh Italian vegetables market of prices change due to a newer traceability procedure, focusing on early potato. Reasons why early potato was the main object of our study will be explained in detail later in the paper. Moreover, this study...
Tipo: Journal Article
Palavras-chave: Traceability; Early potato; Censored demand system estimation; Sample selection approach.; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/101287

SPATIAL EQUILIBRIUM WITH INTERMEDIATE PRODUCTS:  IMPLEMENTATION AND VALIDATION IN THE MERCOSUR
Provedor de dados: 31
Autores: Waquil,   Paulo Dabdab; Cox,   Thomas L.
This paper develops the formulation of a spatial equilibrium model with intermediate products. The presence of intermediate products brings a better representation of the real world, accounting for the technological relationships among commodities in the several stages of production. Instead of the usual assumption of constant costs of transformation, positively sloped cost of transformation functions are assumed, reflecting increasing marginal costs of transformation. The model is implemented and validated in the analysis of the optimal allocation and pricing of animal products, grains and oilseeds in the MERCOSUR.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/12678

Explaining differences in farms efficiencies in Polish agriculture
Provedor de dados: 31
Autores: Hockmann,   Heinrich; Pieniadz,   Agata.
This paper deals with the estimation of a random coefficient model. The virtue of this approach is that it considers firm heterogeneity, which conventional SFA models do not. When the model is applied to Polish farms, the results indicate that the conventional random and fixed effect models overestimate the potential production increases due to the reduction of inefficiency. Additionally, our findings provide evidence of the importance of input quality for efficiency analysis. Moreover, the results indicate that farm heterogeneity is a significant determinant of agricultural production. We found that differences in productivity between the farms can partly be attributed to farm size, degree of integration in the product markets and incurred transaction...
Tipo: Conference Paper or Presentation
Palavras-chave: SFA; Random component model; Poland; Agriculture; Firm heterogeneity; Farm Management; Labor and Human Capital; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; Q12; C23; D24; L23.
Ano: 2009
URL: http://purl.umn.edu/51051

Salvage the treasure of geographic information in Farm census data
Provedor de dados: 31
Autores: Gocht,   Alexander; Roder,   Norbert.
In Germany, since several decades the RAUMIS modelling system is applied for policy impact assessments to measure the impact of agriculture on the environment. A disaggregation at the municipality level with more than 9.600 administrative units, instead of currently used 316 counties, would tremendously improve the environmental impact analysis. Two sets of data are used for this purpose. The first are geo-referenced data, that are, however, incomplete with respect its coverage of production activities in agriculture. The second set is the micro census statistic itself, that has a full coverage, but data protection rules (DPR) prohibit its straightforward use. The paper show how this bottleneck can be passed to obtain a reliable modelling data set at...
Tipo: Conference Paper or Presentation
Palavras-chave: Highest Posterior Density estimator (HPD); RAUMIS; Down scaling; Research Methods/ Statistical Methods; C11; C61; C81; Q15.
Ano: 2011
URL: http://purl.umn.edu/115982

Salvage the treasure of geographic information in Farm census data
Provedor de dados: 31
Autores: Gocht,   Alexander; Roder,   Norbert.
In Germany, since several decades the RAUMIS modelling system is applied for policy impact assessments to measure the impact of agriculture on the environment. A disaggregation at the municipality level with more than 9.600 administrative units, instead of currently used 316 counties, would tremendously improve the environmental impact analysis. Two sets of data are used for this purpose. The first are geo-referenced data, that are, however, incomplete with respect its coverage of production activities in agriculture. The second set is the micro census statistic itself, that has a full coverage, but data protection rules (DPR) prohibit its straightforward use. The paper show how this bottleneck can be passed to obtain a reliable modelling data set at...
Tipo: Conference Paper or Presentation
Palavras-chave: Highest Posterior Density estimator (HPD); RAUMIS; Down scaling; Research Methods/ Statistical Methods; C11; C61; C81; Q15.
Ano: 2011
URL: http://purl.umn.edu/114824

A Nonparametric Approach to The Analysis of HACCP/RMP Implementation Process
Provedor de dados: 31
Autores: Cao,   Kay; Scrimgeour,   Frank G.
In this paper we conduct an analysis of the implementation of HACCP/RMP in the NZ Meat Industry based on the data collected from our recent survey. Nonparametric methods are used to measure the association between plant characteristics such as size, age, activities, and food safety management practices and HACCP/RMP adoption motivations, implementation problems, benefits, and costs. Results give insights into the ongoing process of mandatory RMP in New Zealand.
Tipo: Conference Paper or Presentation
Palavras-chave: HACCP/RMP implementation; New Zealand Meat Industry; Nonparametric methods; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/97786

ROMP-FS1 DOCUMENTATION
Provedor de dados: 31
Autores: Apland,   Jeffrey.
ROMP-FS1 is a research-oriented mathematical programming model designed for the analysis of farming systems using linear programming.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1983
URL: http://purl.umn.edu/13333

A menu-driven facility for complex sample size calculation in randomized controlled trials with a survival or a binary outcome: Update
Provedor de dados: 31
Autores: Barthel,   Friederike Maria-Sophie; Royston,   Patrick; Babiker,   Abdel.
Royston and Babiker (2002) presented a menu-driven Stata program for the calculation of sample size or power for complex clinical trial designs under a survival time or binary outcome. In the present article, the package is updated to Stata 8 under the new name ART. Furthermore, the program has been extended to incorporate noninferiority designs and provides more detailed output. This package is the only realistic sample size tool for survival studies available in Stata.
Tipo: Journal Article
Palavras-chave: Sample size; Power; Randomized controlled trial; Multiarm designs; Survival analysis; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117503

Recent Developments in Unit Root Tests and Historical Crop Yields
Provedor de dados: 31
Autores: Zapata,   Hector O.; Maradiaga,   David Isaias; Pujula,   Aude Liliana; Dicks,   Michael R.
This study conducts an investigation on the application of classical unit-root tests using parametric tests (the augmented Dickey-Fuller, 1979 – ADF), and nonparametric tests (Phillips and Perron, 1988—PP) to corn and soybean yields in the Delta states using county-level data from 1961 to 2009.  The main concern of the paper is to assess what would be drawn about nonstationarity in crop yields using these tests versus using modified versions of these tests (Ng and Perron, 2001) that are assumed to solve size and power problems associated with the ADF and PP tests.  The investigation focuses on methodological aspects of the classical tests, uncovers the nature of filtered yields often needed prior to density estimation, sheds light on the effect of lag...
Tipo: Conference Paper or Presentation
Palavras-chave: Crop yields; Nonstationarity; Unit-roots; Density estimation; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/103871

Contour–enhanced funnel plots for meta–analysis
Provedor de dados: 31
Autores: Palmer,   Tom M.; Peters,   Jaime L.; Sutton,   Alex J.; Moreno,   Santiago G.
Funnel plots are commonly used to investigate publication and related biases in meta-analysis. Although asymmetry in the appearance of a funnel plot is often interpreted as being caused by publication bias, in reality the asymmetry could be due to other factors that cause systematic differences in the results of large and small studies, for example, confounding factors such as differential study quality. Funnel plots can be enhanced by adding contours of statistical significance to aid in interpreting the funnel plot. If studies appear to be missing in areas of low statistical significance, then it is possible that the asymmetry is due to publication bias. If studies appear to be missing in areas of high statistical significance, then publication bias is a...
Tipo: Article
Palavras-chave: Confunnel; Funnel plots; Meta-analysis; Publication bias; Small-study effects; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122589

Measurement error, GLMs, and notational conventions
Provedor de dados: 31
Autores: Hardin,   James W.; Carroll,   Raymond J.
This paper introduces additive measurement error in a generalized linear-model context. We discuss the types of measurement error along with their effects on fitted models. In addition, we present the notational conventions to be used in this and the accompanying papers.
Tipo: Journal Article
Palavras-chave: Generalized linear models; Transportability; Measurement error; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116175

Value Creation Strategies in Credence Food Productions: The Case of Organic Farming in Italy
Provedor de dados: 31
Autores: Pascucci,   Stefano; Capitanio,   Fabian; Del Giudice,   Teresa.
In this paper we analyse different strategies used by Italian organic farmers to create value from credence food production. More specifically, we consider the following strategies: participation in policy support programmes (i.e. rural development measures and agro‐environmental schemes), direct marketing (i.e. short‐chains, on‐farm businesses, agro‐tourism), on‐farm processing and being a member of a marketing and/or processing cooperative. We use data from the 2006 Italian FADN (Farm Accountancy Data Network) related to 981 organic farmers. To estimate the factors affecting farmers’ strategies and to evaluate them simultaneously we implement a multivariate probit model (MVP). The results could be helpful to implement guidelines for public and private...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100474

Technical Compendium: Descriptive Agricultural Statistics and Analysis for Zambia in Support of the USAID Mission’s Feed the Future Strategic Review
Provedor de dados: 31
Autores: Sitko,   Nicholas J.; Chapoto,   Antony; Kabwe,   Stephen; Tembo,   Solomon; Hichaambwa,   Munguzwe; Lubinda,   Rebecca; Chiwawa,   Harrison; Mataa,   Mebelo; Heck,   Simon; Nthani,   Dorothy.
This technical compendium was developed to serve two interrelated purposes: 1.To assist in the development of USAID Zambia’s Feed the Future (FtF) strategy by providing a broad empirical analysis of the current conditions and historical trends shaping Zambia’s agricultural and food sector; and 2. To serve as a technical reference for organizations tasked with designing and implementing programs associated with FtF.
Tipo: Working or Discussion Paper
Palavras-chave: Zambia; Feed the Future; FtF; Statistical analysis; Agricultural and Food Policy; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/104016

Simulation: Methodology and Application in Agricultural Economics
Provedor de dados: 31
Autores: Anderson,   Jock R.
The diverse modelling activity coming under a defined concept of Simulation is reviewed first through a general outline of suggested methodology and secondly through a survey of applications in agricultural economics and kindred disciplines. The review concludes with a consideration of present problems with and future prospects for this increasingly important tool.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1974
URL: http://purl.umn.edu/9675

WHAT DOES MANUFACTURING PROTECTION COST FARMERS? A REVIEW OF SOME RECENT AUSTRALIAN CONTRIBUTIONS
Provedor de dados: 31
Autores: Parmenter,   B.R.
A method proposed by Clements and Sjaastad for measuring the effect of manufacturing protection on farmers' incomes is shown to be theoretically unsound, to use some inappropriate assumptions and to lead to overestimation. Even if corrected, the method seems inferior to estimating directly via ORANI the change in farm incomes which would occur when protection levels change. This is because the model contains detailed theoretical explanations of the price and quantity changes which determine changes in the relevant incomes and is calibrated using extensive empirical evidence about the behaviour of the prices and quantities in the Australian economy. Using ORANI and incorporating recently completed improvements to its agricultural data base, it is estimated...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/22904

USING REGRESSION ANALYSIS TO REDUCE AGGREGATION BIAS IN LINEAR PROGRAMMING SUPPLY MODELS
Provedor de dados: 31
Autores: Kennedy,   John O.S.
Because methods of eliminating aggregation bias are impracticable, an alternative method is suggested for reducing aggregation bias which uses regression estimates of farm resonrce availabilities as functions of farm size. The estimates are incorporated in a parametric run of the LP problem in which size is parameterized. The method is applied to a case study problem, and the results compared with other methods of demarcating representative farms.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/22555

ISSUES IN DATA MANAGEMENT OF EXPENDITURE SURVEYS:  AN EXAMPLE FROM THE COLOMBIAN 1984-85 URBAN SURVEY
Provedor de dados: 31
Autores: Perali,   Carlo Federico; Cox,   Thomas L.
This study examines some of the issues that are often encountered when analysing the socio-economic information of expenditure surveys using the Colombian 1985 urban expenditure survey as an example. This study discusses the problem of estimating prices when only information on expenditures and demographic characteristics is available, the options available when aggregating commodities and defining demographic or labour information, and the advantages and drawbacks in choosing total expenditure as a proxy for income or as the metric for poverty measurement. The study also applies non-parametric density estimation as a form of exploratory data analysis and as a means to learn from the data about the most proper parametric specification.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/12683

Research Areas
Provedor de dados: 31
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/124221

Stata tip 57: How to reinstall Stata
Provedor de dados: 31
Autores: Gould,   William.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120937

An integrated simulation model to evaluate national policies for the abatement of agricultural nutrients in the Baltic Sea
Provedor de dados: 31
Autores: Hyytiainen,   Kari; Ahtiainen,   Heini; Heikkila,   Jaakko; Helin,   Janne; Huhtala,   Anni; Iho,   Antti; Koikkalainen,   Kauko; Miettinen,   Antti; Pouta,   Eija; Vesterinen,   Janne.
This study introduces a prototype model for evaluating policies to abate agricultural nutrients in the Baltic Sea from a Finnish national point of view. The stochastic simulation model integrates nutrient dynamics of nitrogen and phosphorus in the sea basins adjoining the Finnish coast, nutrient loads from land and other sources, benefits from nutrient abatement (in the form of recreation and other ecosystem services) and the costs of agricultural abatement activities. The aim of this study is to present the overall structure of the model and to demonstrate its potential using preliminary parameters. The model is made flexible for further improvements in all of its ecological and economic components. Results of a sensitivity analysis suggest that...
Tipo: Working or Discussion Paper
Palavras-chave: Ecosystem services; Nutrient abatement; Monte Carlo simulation; Recreation; Valuation; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49896

The ENSO Impact on Predicting World Cocoa Prices
Provedor de dados: 31
Autores: Ubilava,   David; Helmers,   Claes Gustav.
Cocoa beans are produced in equatorial and sub-equatorial regions of West Africa, Southeast Asia and South America. These are also the regions most affected by El Nino Southern Oscillation (ENSO) -- a climatic anomaly affecting temperature and precipitation in many parts of the world. Thus, ENSO, has a potential of affecting cocoa production and, subsequently, prices on the world market. This study investigates the benefits of using a measure of ENSO variable in world cocoa price forecasting through the application of a smooth transition autoregression (STAR) modeling framework to monthly data to examine potentially nonlinear dynamics of ENSO and cocoa prices. The results indicate that the nonlinear models appear to outperform linear models in terms of...
Tipo: Conference Paper or Presentation
Palavras-chave: Cocoa Prices; El Nino Southern Oscillation; Out-of-Sample Forecasting; Smooth Transition Autoregression; Demand and Price Analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods; C32; Q11; Q54.
Ano: 2011
URL: http://purl.umn.edu/103528

EFFECT OF AGRICULTURAL RESEARCH &amp; DEVELOPMENT ON THE GDP OF EU MEMBER STATES
Provedor de dados: 31
Autores: Mohamed,   Zsuzsanna; Takacs,   Szabolcs; Szucs,   Istvan; Bedene Szoke,   Eva.
Scientific research, together with technological development and innovation, is a key issue of knowledge-based economies. Having recognized this important role, the European Union has identified the increasing of its research budget to be one of its most important aims. The objective of the common programming of agricultural research is to examine the extent to which society is able to answer the challenges resulting from the Community-level development of renewable raw materials. Joining in the spirit of these endeavours, the aim of our research is to analyze the links between agricultural R&amp;D expenditure and agricultural GDP in the EU member states, relying on the Eurostat database. Our computations were made using constant prices of 2000. The...
Tipo: Journal Article
Palavras-chave: EU; R&amp;D intensity; Production functions; Combination of production factors; EU; K&amp;Fintenzitás; Termelési funkciók; Termelési tényezők kombinációja; Agricultural and Food Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/99202

Estimating parameters of dichotomous and ordinal item response models with gllamm
Provedor de dados: 31
Autores: Zheng,   Xiaohui; Rabe-Hesketh,   Sophia.
Item response theory models are measurement models for categorical responses. Traditionally, the models are used in educational testing, where responses to test items can be viewed as indirect measures of latent ability. The test items are scored either dichotomously (correct–incorrect) or by using an ordinal scale (a grade from poor to excellent). Item response models also apply equally for measurement of other latent traits. Here we describe the one- and two-parameter logit models for dichotomous items, the partial-credit and rating scale models for ordinal items, and an extension of these models where the latent variable is regressed on explanatory variables. We show how these models can be expressed as generalized linear latent and mixed models and...
Tipo: Article
Palavras-chave: Gllamm; Gllapred; Latent variables; Rasch model; Partial-credit model; Rating scale model; Latent regression; Generalized linear latent and mixed model; Adaptive quadrature; Item response theory; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119279

Determinants of adoption and intensity of use of balanced nutrient management systems technologies in the northern Guinea savanna of Nigeria
Provedor de dados: 31
Autores: Akinola,   Adebayo A.; Arega,   D.A.; Adeyemo,   Remi; Sanogo,   Diakalia; Olanrewaju,   Adetunji S.; Nwoke,   C.; Nzigaheba,   G.; Diels,   J.
As part of a major effort to address soil fertility decline in West Africa, a project on Balanced Nutrient Management Systems (BNMS) has since 2000 been implemented in the northern Guinea savanna (NGS) of Nigeria. The project has tested and promoted two major technology packages, including a combined application of inorganic fertilizer and manure (BNMS-manure) and a soybean/maize rotation practice referred to as BNMS-rotation.  This study employed Tobit model to examine factors that influence the adoption and intensity of utilization of BNMS technologies in the NGS of Nigeria. Results showed that less than 10% of the sample households adopted at least one of the two components of the technology package by the end of 2002.  However, by 2005 the adoption of...
Tipo: Conference Paper or Presentation
Palavras-chave: Adoption; BNMS-manure; BNMS-rotation; Northern Guinea Savanna (NGS).; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Institutional and Behavioral Economics; International Relations/Trade; Livestock Production/Industries; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/52007

WHY ECONOMISTS SHOULD TALK TO SCIENTISTS AND WHAT THEY SHOULD  ASK: DISCUSSION
Provedor de dados: 31
Autores: Ahearn,   Mary Clare.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/15548

Irrigation and Water for Sustainable Development; Proceedings of the Second Forum December 15-16, 2008, Addis Ababa, Ethiopia
Provedor de dados: 31
Autores: Awulachew,   Seleshi Bekele; Erkossa,   Teklu; Balcha,   Yodit.
Tipo: Presentation
Palavras-chave: Sustainable development; Irrigation management; Supplemental irrigation; Land management; Investment; Case studies; Public sector; Private sector; Cooperation; Government policy; Rural poverty; Food Security and Poverty; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/118400

AN ECONOMIC TOOL FOR EVALUATING DISEASE MANAGEMENT IN THE JARRAH FORESTS OF WESTERN AUSTRALIA
Provedor de dados: 31
Autores: Dole,   David D.; Brennan,   Paul.
A pathogenic, soil-borne fungus has been gradually spreading through the jarrah forest of Western Australia for most of this century. On some sites this fungus can cause almost total forest destruction. Infection is incurable and the effects are irreversible. This paper develops a means for evaluating disease control measures and identifying the optimal level of protection. Standard protection measures are warranted for high and moderate impact sites, over a wide range of risks. Increased expenditure on forest protection is warranted for high and moderate impact sites at especially high risk.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1996
URL: http://purl.umn.edu/22369

Valuing Farmland Protection with Choice Experiments That Incorporate Preference Heterogeneity: Does Policy Guidance Depend On the Econometric Fine Print?
Provedor de dados: 31
Autores: Johnston,   Robert J.; Bergstrom,   John C.
Although mixed logit models are common in stated preference applications, resulting welfare estimates can be sensitive to minor changes in specification. This can be of critical relevance for policy and welfare analysis, particularly if policymakers are unaware of practical implications. Drawing from an application to agricultural conservation in Georgia, this paper quantifies the sensitivity of welfare estimates to common variations in mixed logit specification and assesses practical implications for policy guidance.  Results suggest that practitioners may wish to reevaluate modeling and reporting procedures to reflect the welfare and policy implications of common but often unnoticed variations in model specification.
Tipo: Conference Paper or Presentation
Palavras-chave: Willingness to Pay; Conservation Easement; PACE; Mixed Logit; Stated Preference; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Q24; Q51.
Ano: 2010
URL: http://purl.umn.edu/61140

Confidence intervals for kernel density estimation
Provedor de dados: 31
Autores: Fiorio,   Carlo V.
This article describes asciker and bsciker, two programs that enrich the possibility for density analysis using Stata. asciker and bsciker compute asymptotic and bootstrap confidence intervals for kernel density estimation, respectively, based on the theory of kernel density confidence intervals estimation developed in Hall (1992b) and Horowitz (2001). asciker and bsciker allow several options and are compatible with Stata 7 and Stata 8, using the appropriate graphics engine under both versions.
Tipo: Journal Article
Palavras-chave: Asciker; Bsciker; Vkdensity; Kernel density asymptotic confidence intervals; Kernel density bootstrap confidence intervals; Asymptotic bias; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116236

How does it work for Hungarian food consumers? A medium-term analysis
Provedor de dados: 31
Autores: Szigeti,   Judith; Podruzsik,   Szilard.
The accession of Hungary to the European Union (EU) in 2004 was expected to lead to price convergence to the EU levels. The influence of national and EU policies on Hungarian producers and consumers is important as they were facing a new situation. Consumers’ welfare depends on the constantly altering world- and common market, and political actions. The purpose of this study is to analyse welfare changes and distributional impacts on Hungarian food consumers. The paper focuses on Laspeyres index, compensating variation and elasticities of demand.
Tipo: Journal Article
Palavras-chave: Food consumption; Consumer welfare; Compensating variation; Price change; Elasticity; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/102400

Predicted probabilities for count models
Provedor de dados: 31
Autores: Long,   J. Scott; Freese,   Jeremy.
The post-estimation command prcounts for generating predicted probabilities after using poisson, nbreg, zip, and zinb is introduced and illustrated.
Tipo: Journal Article
Palavras-chave: Predicted probabilities; Count models; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115935

Indicators
Provedor de dados: 31
Autores: McBride,   William D.; Martinez,   Stephen W.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/121983

Multiple-test procedures and smile plots
Provedor de dados: 31
Autores: Newson,   Roger; The ALSPAC Study Team.
multproc carries out multiple-test procedures, taking as input a list of p-values and an uncorrected critical p-value, and calculating a corrected overall critical p-value for rejection of null hypotheses. These procedures define a confidence region for a set-valued parameter, namely the set of null hypotheses that are true. They aim to control either the family-wise error rate (FWER) or the false discovery rate (FDR) at a level no greater than the uncorrected critical p-value. smileplot calls multproc and then creates a smile plot, with data points corresponding to estimated parameters, the p-values (on a reverse log scale) on the y-axis, and the parameter estimates (or another variable) on the x-axis. There are y-axis reference lines at the uncorrected...
Tipo: Journal Article
Palavras-chave: Smile plot; Multiple-test procedure; Closed testing procedure; Data mining; Family-wise error rate; False discovery rate; Bonferroni; Sidák; Holm; Holland; Copenhaver; Hochberg; Rom; Simes; Benjamini; Yekutieli; Krieger; Liu; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116061

HORTICULTURAL CHOICE DILEMMAS QUESTIONNAIRE
Provedor de dados: 31
Autores: Musser,   Wesley N.; Patrick,   George F.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/28679

Does Marginal Price Matter? A Regression Discontinuity Approach to Estimating Water Demand
Provedor de dados: 31
Autores: Nataraj,   Shanthi; Hanemann,   W. Michael.
Although complex pricing schedules are increasingly common in utility billing, it is difficult to determine whether consumers respond to complicated marginal prices because price changes are often confounded with simultaneous demand shocks or non-price policies. To overcome this challenge, we exploit a natural experiment - the introduction of a third price block in an increasing block pricing schedule for water - in Santa Cruz, California. Using a regression discontinuity design, we find that consumers do respond to changes in marginal price. Doubling marginal price led to a 12% decrease in water use (500 cubic feet per bill) among high-use households.
Tipo: Working or Discussion Paper
Palavras-chave: Water demand; Regression models; Price policy; Consumer behavior; Demand and Price Analysis; Research Methods/ Statistical Methods; D12; Q21; Q25; L95.
Ano: 2008
URL: http://purl.umn.edu/47078

INVESTMENT UNDER UNCERTAINTY AND DYNAMIC ADJUSTMENT IN FINNISH PORK INDUSTRY
Provedor de dados: 31
Autores: Pietola,   Kyosti; Myers,   Robert J.
A dynamic dual model of investment under uncertainty is applied to a panel of Finnish hog farms.  Stochastic dynamic programming is used to characterize duality relations.  The model accommodates irreversibility and/or asymmetric adjustment costs.  Results have important implications for Finland's hog industry as it adjusts to entry into the European Unit.
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1998
URL: http://purl.umn.edu/20953

A Spatiotemporal Fixed Effects Estimation of U.S. State-Level Carbon Dioxide Emissions
Provedor de dados: 31
Autores: Burnett,   J. Wesley; Bergstrom,   John C.
One of the major shortcommings of past environmental Kuznets curve (EKC) studies is that the spatiotemporal aspects within the data have largely been ignored.  By ignoring the spatial aspect of pollution emissions past estimates of the EKC implicitly assume that a region’s emissions are unaffected by events in neighboring regions (i.e., assume there are no transboundary pollution emissions between neighbors).  By ignoring the spatial aspects within the data several past estimates of the EKC could have generated biased or inconsistent regression results.  By ignoring the temporal aspect within the data several past estimates of the EKC could have generated spurious regression results or misspecified t and F statistics.  To address this potential...
Tipo: Conference Paper or Presentation
Palavras-chave: Pollution Economics; Environmental Kuznets Curve; Spatial Econometrics; Dynamic Panel Data; Carbon Dioxide Emissions; Global Climate Change; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C33; C51; Q43; Q50; Q53; Q58.
Ano: 2011
URL: http://purl.umn.edu/103580

WHY STOCHASTICS MATTER: ANALYZING FARM AND BIOFUEL POLICIES
Provedor de dados: 31
Autores: Westhoff,   Patrick C.; Brown,   Scott; Binfield,   Julian C.R.
Standard deterministic analysis of agricultural and biofuel policies can yield incomplete or misleading results. Stochastic analysis is especially important when policies have asymmetric effects and when there is intrinsic interest in uncommon events or the distribution of possible outcomes.  The paper examines four recent cases where a stochastic approach was critical to a complete and balanced examination of important US policy issues. In each case, a stochastic model of the US agricultural and biofuel sectors was used to estimate 500 sets of possible market outcomes for the 2007- 2016 period.  Changes in support levels, a proposed revenue-based program, possible World Trade Organization limits on internal support measures, and biofuel use mandates are...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural policy; Biofuels; Stochastic analysis; Structural model; Agricultural and Food Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6601

The transformation of irrigation boards into water user associations in South Africa: Case studies of the Umlaas, Komati, Lomati and Hereford Irrigation Boards Volume 2
Provedor de dados: 31
Autores: Faysse,   Nicolas; Gumbo,   Jabulani.
Tipo: Working or Discussion Paper
Palavras-chave: Water users’ associations; Organizational development; Institutional development; Water law; Dams; Water users; Forestry; Farmers; Domestic water; History; Water quality; Water allocation; Water rates; Water resource management; Irrigation efficiency; Water use efficiency; Water rights; Canals; Case studies; Farm Management; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/92784

CORRECTING FOR SPATIAL EFFECTS IN LIMITED DEPENDENT VARIABLE REGRESSION: ASSESSING THE VALUE OF "AD-HOC" TECHNIQUES
Provedor de dados: 31
Autores: De Pinto,   Alessandro; Nelson,   Gerald C.
A common test for spatial dependence in regression analysis with continuous dependent variables is the Moran’'s I.  For limited dependent variable models, the standard definition of a residual breaks down because yi is qualitative. Efforts to correct for potential spatial effects in limited dependent variable models have relied on ad-hoc methods such as including a spatial lag variable or using a regular sample that omits neighboring observations. Kelejian and Prucha have recently developed a version of Moran’'s I for limited dependent variable models. We present the statistic in a more accessible way and use it to test the value of previously-used ad-hoc techniques with a specific data set.  Keywords: Moran’s I, Spatial Autocorrelation, Limited Dependent...
Tipo: Conference Paper or Presentation
Palavras-chave: Moran’'s I; Spatial Autocorrelation; Limited Dependent Variable Models; Land-Use Change; Geographical Information Systems (GIS); Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19782

From the help desk: hurdle models
Provedor de dados: 31
Autores: McDowell,   Allen.
This article demonstrates that, although there is no command in Stata for fitting hurdle models, the parameters of a hurdle model can be estimated in Stata rather easily using a combination of existing commands. We also include a likelihood evaluator to be used with Stata’s ml facilities to illustrate how to fit a hurdle model using ml’s cluster(), svy, and constraints() options.
Tipo: Journal Article
Palavras-chave: Hurdle model; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116071

Forecasting Demand for Rural Electric Cooperative Call Center
Provedor de dados: 31
Autores: Kim,   Taeyoon; Kenkel,   Philip L.; Brorsen,   B. Wade.
This research forecasts peak call volume to allow a centralized call center to minimize staffing costs. A Gaussian copula is used to capture the dependence among nonnormal distributions. Peak call volume can be easily and more accurately predicted using the marginal probability distribution with the copula function than without using a copula. The modeling approach allows simulating adding another cooperative. Ignoring the dependence that the copula includes, causes peak values to be underestimated.
Tipo: Conference Paper or Presentation
Palavras-chave: Call center data; Empirical distribution; Extreme value theory; Forecasting; Gamma distribution; Gaussian copula; Simulation; Agribusiness; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/46809

The clustergram: A graph for visualizing hierarchical and nonhierarchical cluster analyses
Provedor de dados: 31
Autores: Schonlau,   Matthias.
In hierarchical cluster analysis, dendrograms are used to visualize how clusters are formed. I propose an alternative graph called a “clustergram” to examine how cluster members are assigned to clusters as the number of clusters increases. This graph is useful in exploratory analysis for nonhierarchical clustering algorithms such as k-means and for hierarchical cluster algorithms when the number of observations is large enough to make dendrograms impractical. I present the Stata code and give two examples.
Tipo: Journal Article
Palavras-chave: Dendrogram; Tree; Clustering; Nonhierarchical; Large data; Asbestos; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116024

Empirical Evidence Concerning the Finite Sample Performance of EL-Type Structural Equation Estimation and Inference Methods
Provedor de dados: 31
Autores: Mittelhammer,   Ronald C.; Judge,   George G.; Schoenberg,   Ron.
This paper presents empirical evidence concerning the finite sample performance of conventional and generalized empirical likelihood-type estimators that utilize instruments in the context of linear structural models characterized by endogenous explanatory variables. There are suggestions in the literature that traditional and non-traditional asymptotically efficient estimators based on moment equations may, for the relatively small sample sizes usually encountered in econometric practice, have relatively large biases and/or variances and provide an inadequate basis for estimation and inference. Given this uncertainty we use a range of data sampling processes and Monte Carlo sampling procedures to accumulate finite sample empirical evidence concerning...
Tipo: Working or Discussion Paper
Palavras-chave: Unbiased moment based estimation and inference; Empirical likelihood; Empirical exponential likelihood; Semiparametric models; Conditional estimating equations; Finite sample bias and precision; Squared error loss; Instrumental conditioning variables; Research Methods/ Statistical Methods; C10; C24.
Ano: 2003
URL: http://purl.umn.edu/25090

PROBLEMS OF CHANGE IN AUSTRALIAN AGRICULTURAL ECONOMICS
Provedor de dados: 31
Autores: Musgrave,   Warren F.
There has been a low level of methodological controversy within the Australian agricultural economics profession. Johnson's 1963 paper is the most significant and in it he passed criticisms on agricultural production economists not unlike those currently being made by political economists of economics in general. These past criticisms have in the main been ignored by the Australian profession but it is suggested that they are now being pushed with renewed vigour and they can no longer be ignored. It is argued that our policy work has by and large been successful and effective except for significant areas where our methodology was of restricted usefulness. In farm management the Johnsonian strictures would seem to apply but a more charitable interpretation...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 1976
URL: http://purl.umn.edu/22376

A Small-Sample Estimator for the Sample-Selection Model
Provedor de dados: 31
Autores: Golan,   Amos; Moretti,   Enrico; Perloff,   Jeffrey M.
A semiparametric estimator for evaluating the parameters of data generated under a sample selection process is developed. This estimator is based on the generalized maximum entropy estimator and performs well for small and ill-posed samples. Theoretical and sampling comparisons with parametric and semiparametric estimators are given. This method and standard ones are applied to three small-sample empirical applications of the wage-participation model for female teenage heads of households, immigrants, and Native Americans.
Tipo: Working or Discussion Paper
Palavras-chave: Maximum entropy; Sample selection; Monte Carlo experiments; Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/25047

An Analysis of Bundle Pricing in Horizontal and Vertical Markets: The Case of the U.S. Cottonseed Market
Provedor de dados: 31
Autores: Shi,   Guanming; Stiegert,   Kyle W.; Chavas,   Jean-Paul.
In this paper, we investigate substitution/complementarity relationships among products sold with different bundled characteristics and under different vertical arrangements. Our conceptual model demonstrates the interactive price impacts emanating from product differentiation, market concentration and market size. The model is applied to the U.S. cottonseed market using transaction level data from 2002 to 2007. This market has been impacted structurally in numerous ways due to the advances and the rapid adoption of seeds with differing bundles of biotechnology traits and vertical penetration emanating from the biotechnology seed industry. Several interesting findings are reported. The econometric investigation finds evidence of sub-additive pricing in the...
Tipo: Working or Discussion Paper
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/92248

A FLEXIBLE PARAMETRIC GARCH MODEL WITH AN APPLICATION TO EXCHANGE RATES
Provedor de dados: 31
Autores: Wang,   Kai-Li; Fawson,   Christopher B.; Barrett,   Christopher B.; McDonald,   James B.
Tipo: Working or Discussion Paper
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/28355

ECONOMIC RESEARCH TRADE-OFFS BETWEEN EFFICIENCY AND EQUITY
Provedor de dados: 31
Autores: West,   Quentin M.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/30421

Do Composite Procedures Really Improve the Accuracy of Outlook Forecasts?
Provedor de dados: 31
Autores: Colino,   Evelyn V.; Irwin,   Scott H.; Garcia,   Philip.
This paper investigates whether the accuracy of outlook hog price forecasts can be improved using composite forecasts in an out-of-sample context. Price forecasts from four wellrecognized outlook programs are combined with futures-based forecasts, ARIMA, and unrestricted Vector Autoregressive (VAR) models. Quarterly data are available from 1975.I through 2007.IV, which allow for a relatively long out-of-sample evaluation period after permitting model specification and appropriate composite-weight training periods. Results show that futures and numerous composite procedures outperform outlook forecasts. At intermediate horizons, OLS composite procedures perform rather well. The superiority of futures and composite forecasts decreases at longer horizons...
Tipo: Conference Paper or Presentation
Palavras-chave: Forecast combination; Outlook; Futures; Time-series; Out-of-sample; Agribusiness; Agricultural Finance; Financial Economics; Livestock Production/Industries; Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53052

SNP and SML estimation of univariate and bivariate binary–choice models
Provedor de dados: 31
Autores: De Luca,   Giuseppe.
We discuss the semi-nonparametric approach of Gallant and Nychka (1987, Econometrica 55: 363–390), the semiparametric maximum likelihood approach of Klein and Spady (1993, Econometrica 61: 387–421), and a set of new Stata commands for semiparametric estimation of three binary-choice models. The first is a univariate model, while the second and the third are bivariate models without and with sample selection, respectively. The proposed estimators are √n consistent and asymptotically normal for the model parameters of interest under weak assumptions on the distribution of the underlying error terms. Our Monte Carlo simulations suggest that the efficiency losses of the semi-nonparametric and the semiparametric maximum likelihood estimators relative to a...
Tipo: Article
Palavras-chave: Snp; Snp2; Snp2s; Sml; Sml2s; Binary-choice models; Semi-nonparametric approach; SNP estimation; Semiparametric maximum likelihood; SML estimation; Monte Carlo simulation; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122586

Modelling Waikato Farm Nitrogen Discharges for Policy Analysis
Provedor de dados: 31
Autores: Ramilan,   Thiagarajah; Scrimgeour,   Frank G.
This study describes the development of bio economic models examining the economic and water quality impact of various proposed policy options in the Upper Waikato catchment. In the first phase nitrogen emissions are determined for representative farming systems using the Overseer nutrient budget model. These model components are integrated into an economic model, which predicts producer responses to various policy options. The second phase determines catchment wide costs and water quality impacts of riparian buffers by combining geographic information system, bio economic modelling and experimental data. The results of the study signals directions for policy initiatives and further analysis exploring policy design and all costs associated with production...
Tipo: Conference Paper or Presentation
Palavras-chave: Riparian margins; Non point pollution; Nitrogen; Linear programming; And Environmental policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Health Economics and Policy; Industrial Organization; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98509

HYPOTHETICAL BIAS: THE MITIGATING EFFECTS OF CERTAINTY QUESTIONS AND CHEAP TALK
Provedor de dados: 31
Autores: Champ,   Patricia A.; Moore,   Rebecca; Bishop,   Richard C.
This paper reports on an investigation of hypothetical bias and approaches to identifying and mitigating the bias.  The split sample design includes an actual donation treatment, a contingent  donation treatment with a follow-up certainty question and a contingent donation treatment with cheap talk.     Studies comparing contingent values to actual payments consistently find that respondents report higher willingness to pay in a hypothetical payment situation relative to an actual payment situation.  While the existence of hypothetical bias has been confirmed in such studies, less attention has been focused on the nature and causes of hypothetical bias. Previous research (Champ et al. 1997, Champ and Bishop 2001) suggests that a small and potentially...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/19951

CHEAP TALK REVISITED:  NEW EVIDENCE FROM CVM
Provedor de dados: 31
Autores: Aadland,   David; Caplan,   Arthur J.
Two recent studies have shown that "cheap talk" is an effective means of eliminating positive hypothetical bias in experimental and field-auction settings.  We further investigate the ability of cheap talk to mitigate positive hypothetical bias in a CVM phone survey administered to over 4,000 households.  Positive hypothetical bias is detected in our data by contrasting revealed and stated preference information.  However, a short, neutral cheap-talk script appears  to exacerbate rather than mitigate the bias.  Based on this and mixed evidence from earlier studies, we suggest caution in using cheap talk as an ex ante control for hypothetical bias.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22112

Private Labels: A Sign of Changing Times
Provedor de dados: 31
Autores: Haas,   Rainer; Weaver,   Robert D.
A widely held view is that a dramatic shift is well underway in the structure of food system. First noticed at the farm level, contracting between retailers and fruit and vegetable growers for specific quality attributes signaled a shift from commodity style markets to relational transactions managed by retail grocers operating on massive spatial scales. By contracting directly with suppliers, retailers found they could more efficiently procure and manage characteristics of products and transactions that affect their performance. Similar contracting between meat processors and growers emerged in animal production. As a result of this shift, retailers define product specifications and contract their production. This new organizational form constitutes a...
Tipo: Conference Paper or Presentation
Palavras-chave: Private labels; Store brands; Pull innovation; Consumer‐orientation; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100586

AJAE Appendix: Tournaments, Fairness, and Risk
Provedor de dados: 31
Autores: Wu,   Steven Y.; Roe,   Brian E.
The material contained herein is supplementary to the article named in the title and published in the American Journal of Agricultural Economics, Volume 88, Number 3, August 2006.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2006
URL: http://purl.umn.edu/7400

POLICY ANALYSIS IN AN IMPERFECTLY COMPETITIVE MARKET: A CONJECTURAL VARIATIONS MODEL FOR THE FOOD MANUFACTURING INDUSTRY
Provedor de dados: 31
Autores: Maier,   Leopold.
The effects of government policies are analyzed in a conjectural variations model of U.S. food manufacturing. The policy elasticities of the perfectly competitive model are valid predictors of policy effects irrespective of the type of oligopoly. Changes in the degree of competition may alter the magnitude of the policy elasticities.  Keywords: firm behavior, market structure, imperfect competition, conjectural variations model, policy analysis, food manufacturing
Tipo: Working or Discussion Paper
Palavras-chave: Firm behavior; Market structure; Imperfect competition; Conjectural variations model; Policy analysis; Food manufacturing; Agribusiness; Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/6878

U.S. Alcohol Consumption: Tax Instrumental Variables in Quadratic Almost Ideal Demand System (QUAIDS)
Provedor de dados: 31
Autores: Jithitikulchai,   Theepakorn.
Replaced with revised version of poster 08/30/11.
Tipo: Conference Paper or Presentation
Palavras-chave: Alcohol Consumption; Instrumental Variables; QUAIDS; Demand and Price Analysis; Public Economics; Research Methods/ Statistical Methods; C330; C510; D120; I100.
Ano: 2011
URL: http://purl.umn.edu/112670

Count Data Models of Prescribed Fire Escapes
Provedor de dados: 31
Autores: Mitchell,   Paul D.; Buman,   Thomas; Buman,   Stanley.
We specify several count data models, parameterizing the probability densities in terms of their means for easier comparison between models.  In addition, we derived a correction of these probability densities for differences in sample sizes, which is a contribution to the count data literature as far as we are aware.  We then empirically implement these models using data from a mail survey of firms using prescribed fire to estimate the expected number of escapes from prescribed burns.  We find that the not correcting for sample size differences can lead to erroneous conclusions concerning the statistical significance of variables.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21055

THE SKY IS FALLING: AN EXAMINATION OF BROILER CONTRACT DESIGN AND GROWER REVENUES
Provedor de dados: 31
Autores: Thomsen,   Michael R.; Goodwin,   Harold L., Jr.; Rodriquez,   Angela.
A math program is used to examine an integrators problem of assigning broiler growers into settlement pools.  The integrator varies the size and frequency of flock placements by grower ability.  This differentiates grower incentives by ability.  Which growers receive the strongest incentives depends on amount of excess grow-out capacity.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20418

THE EAST ASIAN CRISIS: A DYNAMIC COMPUTABLE GENERAL EQUILIBRIUM ANALYSIS
Provedor de dados: 31
Autores: Ianchovichina,   Elena; McDougall,   Robert; Hertel,   Thomas W.
The paper proposes a new disequilibrium approach to modeling international capital mobility. Key to this approach are errors in investors' assessments of potential returns to capital -- such as those recently observed in Asia. We use the model to study dynamic adjustment of North American farm and food industries to a marginally deeper, longer crisis in East Asia.
Tipo: Conference Paper or Presentation
Palavras-chave: Capital mobility; Adaptive expectations; East Asian crisis; Financial Economics; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21587

Income and Poverty Impacts of USAID-Funded Programs to Promote Maize, Horticulture, and Dairy Enterprises in Kenya, 2004-2010
Provedor de dados: 31
Autores: Smale,   Melinda; Mathenge,   Mary K.; Jayne,   Thomas S.; Magalhaes,   Eduardo Castelo; Olwande,   John; Kirimi,   Lilian; Kamau,   Mercy W.; Githuku,   James.
Since 2002, the United States Agency for International Development (USAID) has funded programs to promote maize, dairy, and horticulture enterprises among smallholder farmers in Kenya under the Strategic Objective 7 of Increased Rural Household Incomes. On behalf of USAID, Tegemeo Institute has conducted household surveys to help track key indicators that monitor progress in the implementation of these programs. The first survey was conducted in 2004. Subsequent surveys were conducted every two years (i.e., 2006, 2008, and 2010). The sample comprises households participating and those not participating in the programs. The programs monitored include the Kenya Maize Development Program (KMDP), the Kenya Horticulture Development Project (KHDP), and the Kenya...
Tipo: Working Paper
Palavras-chave: Kenya; Income; Poverty; Household surveys; International Development; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/121864

Firm Birth and Death in U.S. Manufacturing: A Regional Adjustment Model
Provedor de dados: 31
Autores: Brown,   Jason P.; Lambert,   Dayton M.; Florax,   Raymond J.G.M.
Attracting manufacturing investment is a frequently used rural development policy.  Previous research in the location literature has informed policymakers which factors are most important for attracting new firm investment.  Far less is known about the interaction of birth and death of establishments.  A conceptual model of county-level investment in the U.S. manufacturing sector is developed from location theory and subsequent literature.  Specifically, we test the relative importance of location factors influencing firm investment, and if these factors influence firm birth and death differently.  Local factors include agglomeration due to localization, urbanization, and internal economies, market structure, labor quality, availability, and cost, market...
Tipo: Working or Discussion Paper
Palavras-chave: Location determinants; Manufacturing; Count models; Community/Rural/Urban Development; Research Methods/ Statistical Methods; L60; R11; R12.
Ano: 2009
URL: http://purl.umn.edu/49467

AGRICULTURAL ECONOMISTS' EFFECTIVENESS IN REPORTING AND CONVEYING RESEARCH PROCEDURES AND RESULTS
Provedor de dados: 31
Autores: Parcell,   Joseph L.; Kastens,   Terry L.; Dhuyvetter,   Kevin C.; Schroeder,   Ted C.
This study reviews articles using regression analysis published in the Journal of Agricultural and Resource Economics from 1994 to 1998 to determine agricultural economists' effectiveness in reporting and conveying research procedures and results. Based on the authors' experience of surveying articles for this study, several suggestions for reporting of results and how to better separate statistical from economic significance are offered. First, clearly define the dependent variable- preferably in the results table as well as within the text. Second, report parameter estimates in an interpretable form either in the results table or in a subsequent table. Third, report summary statistics. Fourth, report degrees of freedom conspicuously in the results table....
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/31306

Leaving land fallow: The case of subsistence farming in the Western Balkans
Provedor de dados: 31
Autores: Sauer,   Johannes; Davidova,   Sophia; Latruffe,   Laure.
The key question of this paper is why farmers in Kosovo leave land fallow when the total land of their farms is rather small and households are rather large. In order to elicit some barriers to land utilisation in Kosovo, the paper is based on a comprehensive survey investigating agricultural households’ perceptions of production and market conditions, and employs several households and farm characteristics to empirically approximate the significance of different factors for leaving land fallow and not using it for production purposes. Three different models have been estimated. All estimated model specifications show a statistical significance at a satisfactory level and no severe signs of misspecification. One of the main factors farmers stated for their...
Tipo: Conference Paper or Presentation
Palavras-chave: Fallow land decision; Kosovo; Tobit regression; Fractional response regression; Zero-inflated binomial regression; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53278

Tabulation of multiple responses
Provedor de dados: 31
Autores: Jann,   Ben.
Although multiple-response questions are quite common in survey research, Stata’s official release does not provide much capability for an effective analysis of multiple-response variables. For example, in a study on drug addiction an interview question might be, “Which substances did you consume during the last four weeks?” The respondents just list all the drugs they took, if any; e.g., an answer could be “cannabis, cocaine, heroin” or “ecstasy, cannabis” or “none”, etc. Usually, the responses to such questions are stored as a set of variables and, therefore, cannot be easily tabulated. I will address this issue here and present a new module to compute one- and two-way tables of multiple responses. The module supports several types of data structure,...
Tipo: Journal Article
Palavras-chave: Mrtab; Mrgraph; _mrsvmat; Multiple responses; Multiple testing; Tabulate; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117502

ESTIMATION OF CENSORED LA/AIDS MODEL WITH ENDOGENOUS UNIT VALUES
Provedor de dados: 31
Autores: Dong,   Diansheng; Kaiser,   Harry M.; Myrland,   Oystein.
In this study, we develop and estimate a censored LA/AIDS model using household-level purchase data. In addition to imposing non-negativitity constraints, we account for the endogeneity of unit value. We address the non-negativity issue using an Amemiya-Tobin approach, which imposes the adding-up condition on both observed and latent shares. We address the endogeneity of unit value by estimating share equations and unit value equations simultaneously. Given the need to evaluate high-order probability integrals, we use a simulated probability method in the model estimation. This model is applied to estimate and analyze a demand system featuring six fish and three meat commodities, using Norwegian household data.
Tipo: Technical Report
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods; C34; D12.
Ano: 2003
URL: http://purl.umn.edu/122119

Risk aversion in a dynamic trading game
Provedor de dados: 31
Autores: Karp,   Larry S.
The effect of risk aversion on Nash equilibrium trade restrictions is studied using numerical methods. An increase in a nation's level of risk aversion can lead to either an increase or decrease in its equilibrium restriction and either an increase or decrease in its rival's restriction. The linear quadratic dynamic game is generalized to include risk aversion.
Tipo: Working or Discussion Paper
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1986
URL: http://purl.umn.edu/6096

Revenue and Cost Functions in PMP: a Methodological Integration for a Territorial Analysis of CAP
Provedor de dados: 31
Autores: Arfini,   Filippo; Donati,   Michele; Grossi,   L.; Paris,   Quirino.
An integrated policy evaluation tool is proposed for assessing the effects of agricultural policy measures using all the information available at farm level. The tool combines the positive mathematical programming methodology with the cluster analysis technique by using the same panel of data. The PMP model proposed here allows to measure the effects of policy in term of agricultural supply responses including output market price variations. The novel procedure by which the PMP model is articulated permits to recover the set of farm level demand functions for agricultural products and the cost function characterizing the given sample of farms. Cluster analysis is useful for better appreciating the behaviour of farms before and after the policy scenario...
Tipo: Conference Paper or Presentation
Palavras-chave: Positive mathematical programming; Cluster analysis; Integrated tool; Agricultural policies; Policy evaluation; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6636

Revenue Risk Reduction Impacts of Crop Insurance in a Multi-Crop Framework
Provedor de dados: 31
Autores: Woodard,   Joshua D.; Sherrick,   Bruce J.; Schnitkey,   Gary D.
This study develops a multi-crop insurance model which is employed to evaluate crop insurance decisions when several crops are produced jointly. The results suggest that the diversification effects derived from producing multiple crops can substantially alter the risk reduction impacts of crop insurance versus if the decision is viewed from the perspective of a single crop. Further, the relatedness of crop production and price responses among crops differs considerably across insurance products and strategies. As a result, insurance strategies that might provide the maximum risk reduction for an individual crop do not necessarily carry over to the multi-crop case.
Tipo: Conference Paper or Presentation
Palavras-chave: Multi-Peril Crop Insurance; Revenue risk; Crop yield distributions; Multi-crop; Insurance strategies; Hedging effectiveness; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53043

Erfolgsfaktoren von landwirtschaftlichen Unternehmen mit Marktfruchtanbau in Sachsen-Anhalt. Eine empirische Analyse
Provedor de dados: 31
Autores: Dautzenberg,   Kirsti.
The present work attempts based on the analysis of linear structure equation models, to compile regulation factors of the success of agricultural enterprises at the management level. For generation and evaluation reasons, the findings from the factor research are the focus of the study. After introducing the topic of success factor research, current empirical methods are compared based on their explanatory potential. As a result of the comparison, it was decided to apply a confirmatory approach. Linear structure equation models with latent variables are applied to the database. The explanation of the method occurs in chapter 3. They are applied on the factor analysis as well as the path analysis because linear structural equation models concern both. In...
Tipo: Book
Palavras-chave: Agribusiness; Labor and Human Capital; Land Economics/Use; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/93013

Sustainable Relations in International Development Cooperation Projects: The Role of Human Resource Management and Organizational Climate
Provedor de dados: 31
Autores: Zanasi,   Cesare; Rota,   Cosimo.
The importance of organizational issues to assess the success of international development project has not been fully considered yet. An analysis of the literature on the project success definition, focused on the success criteria and success factors, was carried out by surveying the contribution of different authors and approaches. Traditionally projects were perceived as successful when they met time, budget and performance goals, assuming a basic similarity among projects (universalistic approach). However, starting from a non‐universalistic approach, the importance of organization’s effectiveness, in terms of relations sustainability, emerged as a dimension able to define and assess a project success (Belassi W., Tukel O.I., 1996). Based on previous...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100464

DISCRETE DEPENDENT VARIABLES: A GUIDE TO ALTERNATIVE ESTIMATING TECHNIQUES WITH AN ANNOTATIVE BIBLIOGRAPHY OF LOGIT ANALYSIS
Provedor de dados: 31
Autores: Kinsey,   Jean D.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/13830

Chain Networks as a Leverage for Innovation Capacity: The Case of Food SMEs
Provedor de dados: 31
Autores: Kuhne,   Bianka; Gellynck,   Xavier.
Nowadays, innovation is no longer limited to the individual firm but involves increasingly the chain network in which the firm is embedded. The chain network is considered as the place where the internal and external resources of a firm are combined and transformed, leading to innovation capacity. In the increasingly globalizing market, innovation is an important strategic tool for small and medium sized enterprises (SMEs) to achieve competitive advantage. However, SMEs are often confronted with barriers for developing and introducing innovations, such as the lack of economies of scale. Our paper investigates how the chain network is contributing to the enhancement of the innovation capacity and which chain network characteristics are crucial in this...
Tipo: Journal Article
Palavras-chave: Innovation capacity; Chain network; SMEs; Food sector.; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/101281

THE MULTI-PRODUCT ASYMPTOTICALLY IDEAL MODEL: AN APPLICATION TO AGRICULTURE
Provedor de dados: 31
Autores: Lusk,   Jayson L.; Featherstone,   Allen M.
This paper examines the Multi-Product Asymptotically Ideal Production Model as an alternative to the translog and normalized quadratic functional forms using farm level data.  Factors such as ease of estimation, imposition of regularity conditions, and quantitative differences in empirical estimates are compared.
Tipo: Conference Paper or Presentation
Palavras-chave: AIM; Asymptotically Ideal Model; Flexible functional form; Cost function; Production Economics; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21503

Economic Value Added versus Traditional Performance Metrics in the Czech Food-Processing Sector
Provedor de dados: 31
Autores: Chmelikova,   Gabriela.
The aim of this article is to investigate the relationship between Economic Value Added, traditional performance measures (Return on Assets ‘ROA’ and Return on Equity ‘ROE’) and their ability to measure the creation of shareholder wealth in food-processing firms in the Czech Republic. To assess the relationship, a simple regression test was used and the following hypothesis were tested: • a strong positive linear relationship exists between EVA and the traditional performance measures of ROA and ROE and • the EVA measure reflects changes in shareholder wealth more consistently than the traditional performance measures ROA and ROE. The regression analysis results indicate in all cases a positive correspondence between EVA and financial performance metrics...
Tipo: Journal Article
Palavras-chave: Economic value added; Traditional performance metrics; Information content; Food-processing sector; Consumer/Household Economics; Production Economics; Research Methods/ Statistical Methods; Q10; Q11.
Ano: 2008
URL: http://purl.umn.edu/53736

A Stata package for the estimation of the dose–response function through adjustment for the generalized propensity score
Provedor de dados: 31
Autores: Bia,   Michela; Mattei,   Alessandra.
In this article, we briefly review the role of the propensity score in estimating dose–response functions as described in Hirano and Imbens (2004, Applied Bayesian Modeling and Causal Inference from Incomplete-Data Perspectives, 73–84). Then we present a set of Stata programs that estimate the propensity score in a setting with a continuous treatment, test the balancing property of the generalized propensity score, and estimate the dose–response function. We illustrate these programs by using a dataset collected by Imbens, Rubin, and Sacerdote (2001, American Economic Review 91: 778–794).
Tipo: Article
Palavras-chave: Gpscore; Doseresponse; Doseresponse_model; Bias removal; Dose–response function; Generalized propensity score; Weak unconfoundedness; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122599

Teaching statistics to physicians using Stata
Provedor de dados: 31
Autores: Hailpern,   Susan M.
The Clinical Research Training Program (CRTP) at the Albert Einstein College of Medicine at Yeshiva University is a two-year program for physicians leading to a Master of Science degree in Clinical Research Methods. Beginning in July 2004, the program began teaching data analysis using Stata 8 in order to better meet the advanced statistical needs of the students. This paper details the structure and content of the course, how Stata was introduced, and the problems we encountered. Student comments and suggestions on future enhancements to Stata are included. Although challenging, our first semester teaching Stata was a success: the students all learned Stata and, more importantly, continued to use it for the analysis of their own research data after the...
Tipo: Journal Article
Palavras-chave: Teaching statistics to physicians; Menu-driven interaction style; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117516

Modelling heterogeneity in response behaviour towards a sequence of discrete choice questions: a probabilistic decision process model
Provedor de dados: 31
Autores: McNair,   Ben J.; Heshner,   David A.; Bennett,   Jeffrey W.
There is a growing body of evidence in the non-market valuation literature suggesting that responses to a sequence of discrete choice questions tend to violate the assumptions typically made by analysts regarding independence of responses and stability of preferences. Decision processes (or heuristics) such as value learning and strategic misrepresentation have been offered as explanations for these results. While a few studies have tested these heuristics as competing hypotheses, none has investigated the possibility that each explains the response behaviour of a subgroup of the population. In this paper, we make a contribution towards addressing this research gap by presenting a probabilistic decision process model designed to estimate the proportion of...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice experiment; Decision process; Ordering effects; Strategic response; Willingness to pay; Research Methods/ Statistical Methods; C25; L94; Q51.
Ano: 2011
URL: http://purl.umn.edu/100585

Review of Statistics with Stata (Updated for Version 7)
Provedor de dados: 31
Autores: Freese,   Jeremy.
This article reviews Statistics with Stata (Updated for Version 7) by Hamilton.
Tipo: Journal Article
Palavras-chave: Introduction to Stata; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115964

Hog Options: Contract Redesign and Market Efficiency
Provedor de dados: 31
Autores: Urcola,   Hernan A.; Irwin,   Scott H.
This article tests the efficiency of the hog options market and assesses the impact of the 1996 contract redesign on efficiency. We find that the hog options market is efficient, but some options yielded excess returns during the live hogs period but not during the lean hogs period. Our findings indicate that the hog options market is efficient and is consistent with the new contract improving the efficiency of the market. However, other market conditions such as lower transaction costs during the lean hogs period can also contribute to reduce expected option returns during the latter period.
Tipo: Journal Article
Palavras-chave: Hog options; Mispricing perceptions; Contract redesign; Trading returns; Agribusiness; Agricultural Finance; Crop Production/Industries; Demand and Price Analysis; Farm Management; Financial Economics; Livestock Production/Industries; Marketing; Production Economics; Productivity Analysis; Public Economics; Research Methods/ Statistical Methods; C15; G12; G14; Q13.
Ano: 2010
URL: http://purl.umn.edu/100518

THE COMMON AGRICULTURAL POLICY IN ECONOMETRIC MODELS
Provedor de dados: 31
Autores: Sckokai,   Paolo.
The paper reviews the econometric models used in the past 10 years to analyse the most widely used agricultural policy instruments. The main aim of the paper is to provide the reader with an overview of these models, analysing the technical solutions adopted, the type of results that can be obtained, as well as their potential for simulation exercises. The conclusion reached is that the contribution of econometric models to the analysis of the CAP has been significant, especially from the point of view of modelling the main policy instruments according to their theoretical impact on farmers' behaviour. However, many problems have still to be overcome. For this reason, in the concluding section, the paper tries to identify a number of priorities for further...
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/14800

New Developments in Panel Data Estimation: Full-Factorial Panel Data Model
Provedor de dados: 31
Autores: Howie,   Patrick J.; Kleczyk,   Ewa J.
Panel data has been widely used in many social science studies.  Pooling data across cross-sections and time-series improves quality of data analysis; however, the model is limited in its ability to actually accurately predict variables of interest due to severe practical data limitations and the ability of properly capturing varying market structures.  In this article, a simple and innovative model of product share is introduced.  The Full-Factorial Panel Data Model is based on the simple premises of re-conceptualization of any zero-sum group as a series of two-entity markets.  This model solves the challenges associated with pooling data across disparate cross-sections and time-periods as well as the changing competitive market structure issues and...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/9355

Stata tip 23: Regaining control over axis ranges
Provedor de dados: 31
Autores: Winter,   Nicholas J.G.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117535

A MODEL OF JOB CHOICE FOR THE ANALYSIS OF GOVERNMENT INTERVENTION IN STRUCTURAL ADJUSTMENT
Provedor de dados: 31
Autores: Lloyd,   Peter J.
The paper presents a model of choice between alternative available jobs in which each job has an uncertain multi-period income prospect. Imperfectly informed expectations as well as job preferences and attitudes to risk determine the choice. The model is used to locate and discuss some problems of designing government programs which are intended to increase job mobility. The main conclusion is that government interventions may impose costs on the economy which are greater than the benefits because the information needed to assess costs and benefits is not generally available and political pressures may distort the expenditures.
Tipo: Journal Article
Palavras-chave: Public Economics; Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/22768

A short history of Statistics with Stata
Provedor de dados: 31
Autores: Hamilton,   Lawrence C.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117494

Can Climate Change Save Lives? A comment on “Economy-wide estimates of the implications of climate change: Human health"
Provedor de dados: 31
Autores: Ackerman,   Frank; Stanton,   Elizabeth A.
In a recent article in this journal, Francesco Bosello, Roberto Roson, and Richard Tol make the surprising prediction that the first stages of global warming will, on balance, save a large number of lives. Bosello et al. fail to substantiate this remarkable estimate, and they make multiple mistaken or misleading assumptions. They rely on research that identifies a simple empirical relationship between temperature and mortality, but ignores the countervailing effect of human adaptation to gradual changes in average temperature. While focusing on small changes in average temperatures, they ignore the important health impacts of extreme weather events such as heat waves, droughts, floods, and hurricanes. They extrapolate this pattern far beyond the level that...
Tipo: Working or Discussion Paper
Palavras-chave: Community/Rural/Urban Development; Environmental Economics and Policy; Health Economics and Policy; International Development; International Relations/Trade; Public Economics; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/37240

Semiparametric Cost Allocation Estimation
Provedor de dados: 31
Autores: Wikstrom,   Daniel; Peeters,   Ludo; Surry,   Yves R.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/115742

An Econometric Model of CGE Simulations
Provedor de dados: 31
Autores: Hess,   Sebastian.
CGE models are widely used tools for economic assessments of trade policy changes. However, overall confidence in their results tends to be low. We employ the methodological framework of meta-analysis in order to approach a quantitative comparison of CGE-based simulation results. Therefore, we compile a dataset of twelve recent Doha simulations and fit a linear regression model that explains the variance between simulation results on the regional level as a function of various modeling characteristics. The estimates are broadly in range with documented qualitative knowledge about modeling assumptions. The size of the sample limits general conclusions; however, an ongoing research project will extend the approach to a larger sample.
Tipo: Conference Paper or Presentation
Palavras-chave: CGE; Systematic review; Doha round; Evaluation; Research Methods/ Statistical Methods; C20; C68; D58; F10; C99.
Ano: 2005
URL: http://purl.umn.edu/24713

ENDOGENOUS ON-SITE TIME IN THE RECREATION DEMAND MODEL
Provedor de dados: 31
Autores: Berman,   Matthew D.; Kim,   Hong Jin.
Careful modeling of on-site time may substantially improve estimates of the benefits of recreational visits using the travel cost method, especially when on-site time is endogenous. This paper reviews the theory of endogenous on-site time, and shows how the theory may apply to the Random Utility Model (RUM). An empirical example of sport fishing in Southcentral Alaska under varying specifications of on-site time is presented.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/21616

Two-graph receiver operating characteristic
Provedor de dados: 31
Autores: Reichenheim,   Michael E.
The command roctg allows visualizing sensitivity (Se) and specificity (Sp) curves according to the range of values of a new diagnostic test, given a “true” state of an event, the reference test. On request, several options for displaying Se and Sp estimates in, or enhancements for, the graphs are also available.
Tipo: Journal Article
Palavras-chave: Concurrent validity; Sensitivity; Specificity; ROC analysis; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116021

Exchange Rate Dynamics and the Bilateral Trade Balance: The Case of U.S. Agriculture
Provedor de dados: 31
Autores: Baek,   Jungho; Koo,   Won W.; Mulik,   Kranti.
This study examines the dynamic effects of changes in exchange rates on bilateral trade of agricultural products between the United States and its 15 major trading partners. Special attention is paid to investigate whether or not the J-curve hypothesis holds for U.S. agricultural trade. For this purpose, an autoregressive distributed lag (ARDL) approach to cointegration is applied to quarterly time-series data from 1989 and 2007. Results show that the exchange rate plays a crucial role in determining the short- and long-run behavior of U.S. agricultural trade. However, we find little evidence of the J-curve phenomenon for U.S. agricultural products with the United States’ major trading partners.
Tipo: Journal Article
Palavras-chave: Agricultural trade; Autoregressive distributed lag approach to cointegration; Bilateral trade; J-curve effect; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/55546

Lean mainstream schemes for Stata 8 graphics
Provedor de dados: 31
Autores: Juul,   Svend.
The new Stata 8 graphics are powerful and flexible. Now, a few months after the first release, the graphics still have some shortcomings—both in design and in the manual documenting the program—but progress is being made. The graph layout used throughout the Graphics Reference Manual has led some users to underestimate the potential of the program. This paper presents two schemes for a lean layout, conforming to the mainstream in scientific publishing.
Tipo: Journal Article
Palavras-chave: Graphs; Schemes; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116117

AN ADVANCED METHOD FOR ECONOMIC THRESHOLD DETERMINATION: A POSITIVE APPROACH
Provedor de dados: 31
Autores: Talpaz,   Hovav; Frisbie,   Ray E.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/29504

Managing Network Goals: The Interplay of Network and Firm Levels
Provedor de dados: 31
Autores: Ziggers,   Gerrit Willem; Gagalyuk,   Taras; Hanf,   Jon Henrich.
This article provides several contributions to the general understanding of governance in networks and the achievement of private and common goals. A simple, integrated framework for understanding why firms collaborate and under which conditions they establish durable networks that succeed in achieving goals is provided. Network theory is extended by explicitly distinguishing between dyadic‐level governance and network‐level governance conditions, and by identifying exchange conditions that promote governance. This way issues as how networks evolve, how they are governed, and ultimately, how collective outcomes might be generated can be better comprehended. This is especially relevant to policy planners and those having a perspective that goes beyond the...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100465

Innovation Trajectories in Honduras’ Coffee Value Chain. Public and Private Influence on the Use of New Knowledge and Technology among Coffee Growers
Provedor de dados: 31
Autores: Hartwich,   Frank; Fromm,   Ingrid; Romero,   Gustavo.
In this paper, results from a study on the use of improved coffee production technology schemes among smallholder coffee producers in three prominent coffee producing regions in Honduras are presented. The impact of various schemes (trajectories) in which different agents influence the producers’ decision to use new technologies was analyzed. In particular, there are differences in the influence of a) private coffee buying organizations and b) government and public development agencies on the innovation behavior of coffee growers. Drawing from network data that depict the internal and outbound connectedness of producers in three village communities in main coffee producing zones in Honduras, tools of social network analysis were applied to find out how...
Tipo: Journal Article
Palavras-chave: Coffee production; Innovation; Upgrading; Social networks; Honduras; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/97027

Multi-Output Broadacre Agricultural Production: Estimating A Cost Function Using Quasi-Micro Farm Level Data From Australia
Provedor de dados: 31
Autores: Nguyen,   Duong T.M.; McLaren,   Keith Robert; Zhao,   Xueyan.
Existing econometric models for Australian broadacre agricultural production are few and have become dated. This paper estimates a multi-product restricted cost function using a unique quasi-micro farm level dataset from the Australian Agricultural and Grazing Industries Survey. Both the transcendental logarithmic and normalized quadratic functional forms are employed. Heteroskedasticity caused by the particular nature of the quasi-micro data is also assessed and accommodated. Allen partial elasticities of input substitution and own-and cross-price input demand elasticities are computed. The estimated demands for most production factors are inelastic to prices. Hired labour is responsive to own price and cropping input prices.
Tipo: Conference Paper or Presentation
Palavras-chave: Production Economics; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6009

The Optimization of Pastry Delivery for NOPEK Bakery in Vysoké Mýto
Provedor de dados: 31
Autores: Kucera,   Petr; Jarkovska,   Martina.
While transporting some material a circular way of the transportation is usually applied. Usually due to some capacity or time constraints or other reasons it is necessary to use more routes (i.e. more vehicles, or one vehicle must go out from its home place more times). This case is called the vehicle routing problem and there exist many types of this task because of the variety of reasons causing the necessity of use more than one route.  Practically all the vehicle routing problems belong among the so-called NP-complete or NP-hard problems. This means that there exists no effective method which would succeed in finding a precise theoretical optimum for them. In such tasks, we can employ different approximation methods which provide us with solutions...
Tipo: Journal Article
Palavras-chave: Bakery products delivery; Vehicle routing problem; Heuristics (approximation method); Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; GA; IN.
Ano: 2010
URL: http://purl.umn.edu/99088

APPLICATION OF MULTIVARIATE ANALYSIS TO DETERMINE INFLUENCE OF RESOURCE BASE ON CHANGES IN ECONOMIC ACTIVITY 1960-70
Provedor de dados: 31
Autores: Kerns,   Waldon R.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/29438

Data Aggregation and Information Loss
Provedor de dados: 31
Autores: McKee,   Gregory J.; Miljkovic,   Dragan.
Analysts often use a single average or otherwise aggregated price series to represent several geographic or product markets even when disaggregate data are available. We hypothesize that such an approach may not be appropriate under some circumstances, such as when only long-term relationships hold among price series or when homogeneous but relatively perishable products are considered. This question is of particular relevance in agriculture because of seasonality in production and harvest across various production regions, and the effect of changes in demand as substitute crops become available. We analyze this question in the context of fresh strawberry production. We find that in the case of the strawberry market, aggregate series are appropriate for...
Tipo: Conference Paper or Presentation
Palavras-chave: Strawberry; Price; Cointegration; Granger causality; Average price; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/9843

Measuring Eco-efficiency of Agricultural Activity in European Countries: A Malmquist Index Analysis
Provedor de dados: 31
Autores: Serrao,   Amilcar.
This paper develops an environmental performance index by applying the benefit of the doubt weighting and the Malmquist index concepts using Kuosmanen and Kortelainen’s approaches. The main difference between these approaches and other methods is that environmental performance is based on the definition of the eco-efficiency as the ratio of economic value added to the environmental damage index.  The overall environmental performance index is also decomposed into two components representing changes due to technological progress (or regress) and due to changes in relative eco-efficiency.    The dynamic environmental performance analysis is applied to 15 European agricultures from 1990 to 2004. Model results show that technical progress mostly explain...
Tipo: Conference Paper or Presentation
Palavras-chave: Benefit of the doubt weighting; Data Envelopment Analysis; Eco-efficiency; Environmental performance analysis; Malmquist Index; Agricultural Activity; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q57; C43; C61.
Ano: 2008
URL: http://purl.umn.edu/6152

File filtering in Stata: Handling complex data formats and navigating log files efficiently
Provedor de dados: 31
Autores: Eng,   John.
A text file filter is a program that converts one text file into another on the basis of a set of rules. For statistical applications, a text file filter can convert data embedded in a complicated text file so that Stata can read and analyze it. A text file filter can also automate the production of more user-friendly output from long Stata log files. The file command lets you use text file filters in Stata. This article reviews some key programming points for successful implementation of such filters.
Tipo: Article
Palavras-chave: Nullfilter; Matchfilter; Hyperlog; File; Log; Navigation; Text; Filtering; Data import; Data export; HTML; Hyperlink index; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119257

Analysis on Financing Status of Infrastructure in Agricultural High-tech Demonstration Zone of Yangling City and Application of PPP Mode
Provedor de dados: 31
Autores: Jian-ling,   L.V.; Chao,   G.E.
Financing mode of municipal public utilities in agricultural High-tech Demonstration Zone of Yangling City was mainly divided into five kinds, including financial financing mode, debt financing mode, enterprise accumulation mode, business resources mode, foreign direct investment and private capital financing mode. Due to the single investment subject, narrow financing channel, monopoly management and ineffectiveness of capital utilization in infrastructure financing, PPP mode based on the co-operative financing of public sector and private enterprises was put forward. The financing applications of PPP mode in Yangling Demonstration Zone were discussed either. However, attentions should be paid to establish a benign partnership between government and...
Tipo: Thesis or Dissertation
Palavras-chave: Infrastructure; PPP mode; Yangling Demonstration Zone; China; Agricultural Finance; Financial Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53774

Forecast of rural gross social output value in Jiangsu Province based on optimized grey model
Provedor de dados: 31
Autores: Men,   Ke-pei; Zhang,   Na.
We establish the optimized grey model with logarithm new development coefficient by screening according to the latest statistical data during 2007 in Jiangsu Province. Empirical analysis and prediction research on rural gross social output value in Jiangsu Province from the year 2008 to 2012 are carried out. Result shows that the rural gross social output value in Jiangsu Province in 2008 reached 6 169.697 billion yuan, and will be 9 511.017 billion yuan at the end of 2010, which is about 6.690 times of that in the year 2000. Target of the “Eleventh Five-Year Plan” is expected to be realized smoothly.
Tipo: Thesis or Dissertation
Palavras-chave: Rural gross social output value in Jiangsu Province; Grey modeling; Optimized grey model with logarithm new development coefficient; Forecast; China; Agribusiness; Agricultural Finance; Community/Rural/Urban Development; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53469

Using Aalen's linear hazards model to investigate time-varying effects in the proportional hazards regression model
Provedor de dados: 31
Autores: Hosmer,   David W.; Royston,   Patrick.
In this paper, we describe a new Stata command, stlh, which estimates and tests for the significance of the time-varying regression coefficients in Aalen’s linear hazards model; see Aalen (1989). We see two potential uses for this command. One may use it as an alternative to a proportional hazards or other nonlinear hazards regression model analysis to describe the effects of covariates on survival time. A second application is to use the command to supplement a proportional hazards regression model analysis to assist in detecting and then describing the nature of time-varying effects of covariates through plots of the estimated cumulative regression coefficients, with confidence bands, from Aalen’s model. We illustrate the use of the command to perform...
Tipo: Journal Article
Palavras-chave: Survival analysis; Survival-time regression models; Time-to-event analysis; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116019

Are Travelers Willing to Pay a Premium to Stay at a “Green” Hotel? Evidence from an Internal Meta-Analysis of Hedonic Price Premia
Provedor de dados: 31
Autores: Kuminoff,   Nicolai V.; Zhang,   Congwen; Rudi,   Jeta.
A growing number of hotels provide “green” lodging for travelers with strong environmental preferences. Twelve states have developed certification programs to regulate these claims. After describing the new market for green lodging, we use data on prices and amenities of “green” and “brown” hotels in Virginia to estimate a hedonic model of hotel room pricing. We find that travelers can expect to pay a significant premium for a standard room in a green hotel. An internal meta-analysis is used to evaluate the robustness of this result to subjective econometric modeling decisions. Our results indicate a premium between $9 and $26.
Tipo: Journal Article
Palavras-chave: Green lodging; Hedonic; Hotel; Internal meta-analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/95612

From the help desk: Local polynomial regression and Stata plugins
Provedor de dados: 31
Autores: Gutierrez,   Roberto G.; Linhart,   Jean Marie; Pitblado,   Jeffrey S.
Local polynomial regression is a generalization of local mean smoothing as described by Nadaraya (1964) and Watson (1964). Instead of fitting a local mean, one instead fits a local pth-order polynomial. Calculations for local polynomial regression are naturally more complex than those for local means, but local polynomial smooths have better statistical properties. The computational complexity may, however, be alleviated by using a Stata plugin. In this article, we describe the locpoly command for performing local polynomial regression. The calculations involved are implemented in both ado-code and with a plugin, allowing the user to assess the speed improvement obtained from using the plugin. Source code for the plugin is also provided as part of the...
Tipo: Journal Article
Palavras-chave: Local polynomial; Local linear; Smoothing; Kernel; Plugin; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116196

Asimetrías en la transmisión de precios en el sector del tomate en España
Provedor de dados: 31
Autores: Ben Kaabia,   Monia; Gil Roig,   Jose Maria.
RESUMEN: El objetivo de este trabajo consiste en analizar el proceso de transmisión de precios a lo largo de la cadena comercial en el sector del tomate en España. Para ello se han considerado el precio percibido por el productor y el pagado por el consumidor. El enfoque metodológico adoptado se basa en la estimación de un Vector de Corrección del Error con umbrales. Los resultados indican que, a largo plazo, los dos precios son homogéneos. Sin embargo, en el corto plazo las reacciones de precios, tanto en velocidad como en magnitud, son asimétricas. Es más, los resultados indican que los detallistas se benefician (en el sentido de que son capaces de aumentar el margen comercial) de cualquier shock, ya sea positivo o negativo, que afecte tanto a las...
Tipo: Journal Article
Palavras-chave: Asimetrías; Cointegración por umbrales; Precios; Tomate; Threshold cointegration; Prices; Tomato; Asymmetries; Demand and Price Analysis; Research Methods/ Statistical Methods; C32; Q13.
Ano: 2008
URL: http://purl.umn.edu/37189

Bias and Efficiency of Uniform Bid Design in Contingent Valuation
Provedor de dados: 31
Autores: Kim,   Sooil.
While contingent valuation (CV) methods have experienced growing popularity for estimating the willingness to pay for nonmarket goods and services, optimal bid designs for CV that provide guidance in bid point placement often render themselves impractical by relying on pretest or prior information about the true distribution for willingness to pay.  We investigate the use of a practical alternative to existing optimal or robust bid designs called the uniform design. Uniform design randomly draws bid points from a predetermined uniform distribution. Analytics and simulations show that the uniform design has higher low-bound of relative efficiency at 84 percent of D-optimum than a robust design. Simulations also demonstrate that uniform design outperforms...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21335

FIML estimation of an endogenous switching model for count data
Provedor de dados: 31
Autores: Miranda,   Alfonso.
This paper presents code for fitting a FIML endogenous switching Poisson count model for cross-sectional data in Stata 7: the espoisson command. The Poisson process depends on an unobserved heterogeneity term, ε; a set of explanatory variables, x; and an endogenous dummy, d. The endogenous dummy depends on an unobserved random term, v. Correlation between ε and v is allowed. If a model with exogenous d is fitted instead, correlation between ε and v will result in simultaneous equation bias. The endogenous switching model corrects this problem. After describing the underlying econometric theory behind the command, an example is discussed.
Tipo: Journal Article
Palavras-chave: Count models; Endogenous switch; Sample selection; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116208

BOOTSTRAPPING IN VECTOR AUTOREGRESSIONS: AN APPLICATION TO THE PORK SECTOR
Provedor de dados: 31
Autores: Susanto,   Dwi; Zapata,   Hector O.; Cramer,   Gail L.
Standard bootstrap method is used to generate confidence intervals (CIs) of impulse response functions of VAR and SVAR models in the pork sector.  In the VAR model, the bootstrap method does not produce significant different results from Monte Carlo simulations.  In the SVAR analysis, on the other hand, the bootstrap CIs are significantly different from Monte Carlo CIs after a six period forecast intervals. This suggests that the choice of method used to measure reliability of IRFs is not trivial. Furthermore, bootstrap CIs in SVAR model seem to be more stable than MC CIs, which tend to be wider in the longer horizons.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20051

Review of Generalized Latent Variable Modeling by Skrondal and Rabe-Hesketh
Provedor de dados: 31
Autores: Newson,   Roger.
This article reviews Generalized Latent Variable Modeling: Multilevel, Longitudinal, and Structural Equation Models by Skrondal and Rabe-Hesketh.
Tipo: Journal Article
Palavras-chave: GLLAMM; Generalized linear latent and mixed models; Latent variables; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117504

Speaking Stata: Graphing distributions
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Graphing univariate distributions is central to both statistical graphics, in general, and Stata’s graphics, in particular. Now that Stata 8 is out, a review of official and user-written commands is timely. The emphasis here is on going beyond what is obviously and readily available, with pointers to minor and major trickery and various user-written commands. For plotting histogram-like displays, kernel-density estimates and plots based on distribution functions or quantile functions, a large variety of choices is now available to the researcher.
Tipo: Journal Article
Palavras-chave: Graphics; Histogram; Spikeplot; Dotplot; Onewayplot; Kdensity; Distplot; Qplot; Skewplot; Bin width; Rug; Density function; Kernel estimation; Transformations; Logarithmic scale; Root scale; Intensity function; Distribution function; Quantile function; Skewness; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116213

International Environmental Agreements: Emissions trade, safety valves and escape clauses
Provedor de dados: 31
Autores: Karp,   Larry S.; Zhao,   Jinhua.
We explain how the structure of multi-national or multi-regional environmental agreements affect their chance of success. Trade in emissions permits has ambiguous and in some cases surprising effects on both the equilibrium level of abatement, and on the ability to persuade nations or regions to participate in environmental agreements. An escape clause policy and a safety valve policy have essentially the same properties when membership in environmental agreement is pre-determined, but they create markedly different effects on the incentives to join such an agreement. The two policies lead to a qualitative difference in the leverage that a potential member of the agreement exercises on other members.
Tipo: Working or Discussion Paper
Palavras-chave: Kyoto Protocol; Escape clause; Emissions trade; Cost uncertainty; Participation game; International Environmental Agreement; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; C72; H4; Q54.
Ano: 2009
URL: http://purl.umn.edu/51611

The Impact of the Oil Sector on Commodity Prices: Correlation or Causation?
Provedor de dados: 31
Autores: Saghaian,   Sayed H.
The interconnections of agriculture and energy markets have increased through the rise in the new biofuel agribusinesses and the oil–ethanol–corn linkages. The question is whether these linkages have a causal structure by which oil prices affect commodity prices and through these links, instability is transferred from energy markets to already volatile agricultural markets. In this article, we present empirical results using contemporary time-series analysis and Granger causality supplemented by a directed graph theory modeling approach to identify the links and plausible contemporaneous causal structures among energy and commodity variables. The results show that although there is a strong correlation among oil and commodity prices, the evidence for a...
Tipo: Journal Article
Palavras-chave: Ethanol prices; Crude oil prices; Corn prices; Soybean prices; Wheat prices; Causal structure; Agribusiness; Crop Production/Industries; Environmental Economics and Policy; Production Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Q11; Q13; Q42; Q48.
Ano: 2010
URL: http://purl.umn.edu/92582

Design and Implementation of Flower Export Consortium in Ceará State, Brazil
Provedor de dados: 31
Autores: da Silva Junior,   Aziz Galvao; Perez,   Ronaldo; Amin,   Daniel; Sabioni Ferreira,   Marjorie A.
The Brazilian presence in international commerce, despite the regional leadership in Latin America and the global importance of Brazil as an emerging economy, is quite limited, reaching only 1% of the world’s total trade. Nevertheless, the agribusiness sector is responsible for half of the country’s export and Brazil is the world leader in sugar, coffee, orange juice, tobacco, soybean and beef export. Export growth is considered to be a key factor for the economic development of the country and many governmental programs are being carried out. The Ministry of Agriculture, Livestock and Food Supply (MAPA), through its Cooperative Department (DENACOOP), has joined these efforts. The DENACOOP export consortia program is focused on building strategic alliance...
Tipo: Presentation
Palavras-chave: Flower production chain; Export consortium; Ceará -Brazil; Agribusiness; International Relations/Trade; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/122024

From the help desk: Transfer functions
Provedor de dados: 31
Autores: McDowell,   Allen.
The question often arises as to whether one can estimate a transfer function model using Stata. While Stata does not currently have a convenience command for doing so, this article will demonstrate that estimating such a model can be accomplished quite easily using Stata’s arima command. The classic text for transfer function modeling is Box, Jenkins, and Reinsel (1994); however, a more concise presentation can be found in Brockwell and Davis (1991).
Tipo: Journal Article
Palavras-chave: Arima; Xcorr; Corrgram; Transfer function; Impulse-response function; Autocorrelation function; Cross-correlation function; Pre-whitened; Linear filter; Difference equation; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115952

CHOICE OF REGRESSION METHOD FOR DETRENDING TIME SERIES DATA WITH NONNORMAL ERRORS
Provedor de dados: 31
Autores: Swinton,   Scott M.; King,   Robert P.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/13954

An evaluation of the economic impact of Climate Change through a three-stages Discrete Stochastic Programming model
Provedor de dados: 31
Autores: Cortignani,   Raffaele; Dono,   Gabriele; Doro,   Luca; Ledda,   Luigi; Mazzapicchio,   Graziano.
The climate change in the agricultural sector acting on multiple weather variables at different times of the various crop cycles. In several cases by changing the mean level of variables (rainfall, temperature, etc..), in other cases by changing the distribution of events. This work provides an evaluation of the economic impact due to changes in multiple events, and to the associated uncertainty. For this reason, a classical two-stage stochastic programming model was extend into a three-stages model. The model is specified for an area of Sardinia, and examines the impact of climate change on rainfall and hence on the availability of water for agriculture, and on maximum temperatures and, therefore, on the requirements of some irrigated crops relevant to...
Tipo: Conference Paper or Presentation
Palavras-chave: Discrete Stochastic Programming Model; Climate change; Water availability; Irrigation requirements; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/109317

Sort a list of items
Provedor de dados: 31
Autores: Royston,   Patrick.
The command listsort for sorting the contents of a set of local macros is introduced and illustrated.
Tipo: Journal Article
Palavras-chave: Sorting; Local macros; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115941

MODELING THE EFFECT OF SPATIAL EXTERNALITIES ON INVASIVE SPECIES MANAGEMENT
Provedor de dados: 31
Autores: McKee,   Gregory J.; Goodhue,   Rachael E.; Chalfant,   James A.; Carter,   Colin A.
Changes in production conditions associated with biological invasions can be complex. As a result, modeling invasive species management decisions can be difficult.  Modeling these decisions is further compounded by externalities associated with spatial relationships among growers.  In order to calculate optimal management decisions, an accurate bioeconomic model of the feedback between grower decisions and the new biological interactions created by an invasive species population is needed.  In this paper, a bioeconomic model is used to explicitly analyze how externalities caused by spatial relationships among agricultural producers affect optimal invasive species management decisions.  The example of the coordinated greenhouse whitefly management in the...
Tipo: Conference Paper or Presentation
Palavras-chave: Invasive species; Strawberry; Greenhouse whitefly; Externality; Optimal management; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21137

Should I Make or Should I Buy? Innovation Strategies and Governance Structures in the Italian Food Sector
Provedor de dados: 31
Autores: Pascucci,   Stefano; Royer,   Annie; Bijman,   Jos.
This paper analyses the “make or buy” decision of food firms applied to innovation strategy using 389 Italian food firms data from the Unicredit 2007 database. We develop a set of hypothesis from three theoretical perspectives such as transaction cost economics, strategic management and resource-based view. Our paper aims at highlight whether or not different firm’s features can be linked to the decision to make or buy. We found out that these two decisions are positively interlinked. Moreover we also found out that it is difficult to indicate a clear-cut behaviour for the Italian food firms if we refer to making or buying decisions. We discuss these results and use them to bring some interesting outcomes to discuss managerial implications and/or policy...
Tipo: Article
Palavras-chave: Innovation determinants; Technology sourcing; Innovation.; Agribusiness; Agricultural and Food Policy; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121856

Economic Impacts of Regional Approaches to Rural Development: Initial Evidence on the Delta Regional Authority
Provedor de dados: 31
Autores: Pender,   John L.; Reeder,   Richard J.
This study assesses the initial economic outcomes of the Delta Regional Authority (DRA), which began funding rural development projects in the Mississippi Delta region in 2002. The study focuses on non-metropolitan DRA counties and similar counties elsewhere in the Mississippi Delta region and the southeast, using a quasi-experimental approach that combines matching methods, double and triple difference and switching regression estimation. We find that per capita income and transfer payments grew more rapidly in DRA counties than similar non-DRA counties, and that these impacts are larger in counties in which DRA spending was larger. Each additional dollar of DRA spending per capita is associated with an increase of $15 in personal income per capita...
Tipo: Conference Paper or Presentation
Palavras-chave: Rural economic development programs; Economic impacts; Mississippi Delta; Delta Regional Authority; Matching estimators; Double difference; Triple difference estimation; Switching regression; Community/Rural/Urban Development; Research Methods/ Statistical Methods; R58; R11; O18; C21.
Ano: 2010
URL: http://purl.umn.edu/60909

AN INTRODUCTION TO SYSTEMATIC SENSITIVITY ANALYSIS VIA GAUSSIAN QUADRATURE
Provedor de dados: 31
Autores: Arndt,   Channing.
Economists recognize that results from simulation models are dependent, sometimes highly dependent, on values employed for critical exogenous variables.   To account for this, analysts sometimes conduct sensitivity analysis with respect to key exogenous variables.   This paper presents a practical approach for conducting systematic sensitivity analysis, called Gaussian quadrature.   The approach views key exogenous variables as random variables with associated distributions. It produces estimates of means and standard deviations of model results while requiring a limited number of solves of the model. Under mild conditions, all of which hold with respect to the GTAP model, there is strong reason to believe that the estimates of means and standard...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/28709

Depreciation erodes the Coase Conjecture
Provedor de dados: 31
Autores: Karp,   Larry S.
If a durable good monopolist produces at constant marginal costs and the good depreciates, there exists a family of Strong Markov Perfect Equilibrium (SMPE) with an infinitesimal period of commitment. One member of this family entails instantaneous production of the level of stock produced in a competitive equilibrium; this is consistent with the Coase Conjecture. Other SMPE in the family entail steady state production at a stock level lower than in the competitive equilibrium. In these equilibria, there may be a jump to the steady state, or the steady state may be approached asymptotically. Monopoly profits are positive in these equilibria, and the Coase Conjecture fails. We contrast this result to other papers which use non-Markov strategies to construct...
Tipo: Working or Discussion Paper
Palavras-chave: Coase Conjecture; Depreciation; Multiple Markov Equilibria; Industrial Organization; Research Methods/ Statistical Methods; D42; L12; Q39.
Ano: 1995
URL: http://purl.umn.edu/6115

Stata tip 31: Scalar or variable? The problem of ambiguous names
Provedor de dados: 31
Autores: Kolev,   Gueorgui I.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117579

Imputation of Suppressed CBP Employment Records
Provedor de dados: 31
Autores: Register,   D. Lane; Lambert,   Dayton M.; English,   Burton C.; Jensen,   Kimberly L.; Menard,   R. Jamey; Brown,   Jason P.
Suppression of employment records in the US County Business Patterns (CBP) data sets constrains the detail of new methods and recent advances in the analysis of the geographic distribution of firms and employment. Data sets created by imputation procedures can be purchased, but cost often puts them beyond the reach of many research budgets. Fortunately, methods exist whereby researchers can impute suppressed employment records. A comparison of these procedures is necessary to assess the accuracy and flexibility of each.
Tipo: Presentation
Palavras-chave: Imputation; County Business Pattern data; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/124039

Cover and Contents Pages
Provedor de dados: 31
Includes:  Front Cover, Editorial Information, Contents Page, Editorial Board, Association Officers, Executive Committee
Tipo: Journal Article
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Industrial Organization; Institutional and Behavioral Economics; International Development; International Relations/Trade; Labor and Human Capital; Land Economics/Use; Livestock Production/Industries; Marketing; Political Economy; Production Economics; Productivity Analysis; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/55552

Speaking Stata: The protean quantile plot
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Quantile plots showing by default ordered values versus cumulative probabilities are both well known and also often neglected, considering their major advantages. Their flexibility and power is emphasized by using the qplot program to show several variants on the standard form, making full use of options for reverse, ranked, and transformed scales and for superimposing and juxtaposing quantile traces. Examples are drawn from the analysis of species abundance data in ecology. A revised version of qplot is formally released with this column. Distribution plots in which the axes are interchanged are also discussed briefly, in conjunction with a revised version of distplot, also released now.
Tipo: Journal Article
Palavras-chave: Qplot; Distplot; Distributions; Quantile plots; Statistical graphics; Species abundance; Ecology; Whittaker plots; Broken stick; Lognormal; Power laws; Scaling laws; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117532

Choice Experiments: identifying preferences or production functions?
Provedor de dados: 31
Autores: Gibson,   Fiona L.; Burton,   Michael P.
This report presents an alternative perspective on how respondents consider choice experiment options.    Building on the ‘new’ model of consumer demand by Stigler and Becker (1977), the report suggests that the attributes within choice experiments are not valued directly. Rather, they are used to generate higher-level improvement in the environment (‘constructs’). This implies that to achieve the environmental outcome, what are currently viewed as marginal utilities of attributes are in fact marginal utilities mixed with (subjective) marginal productivity of the attribute.    The research report also proposes that hierarchical Information integration methods may allow separate identification of the utility and production functions, and the individual...
Tipo: Report
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94889

PROPOSAL FOR A TERRITORIAL ASSESSMENT OF THE EFFECTS OF AGRICULTURAL POLICIES WITH A GEOREFERRED MATHEMATICAL PROGRAMMING MODEL: A CASE STUDY
Provedor de dados: 31
Autores: Scozzafava,   Gabriele.
The primary sector has always had a fundamental role in human activities. In recent years, major industrialised and developed countries increased demand for the positive externalities generated by the agriculture, while they reduced the importance of the sector in terms of production of food. The evolution of public intervention followed the change of the role of agriculture and has tried to propose instruments able to consider and balance both private and public interests. It is especially with the Mid Term Review (MTR) that policy maker has tried to implement a system of subsidies that bound the farmer to a series of activities related either directly or indirectly with the collective welfare. Moving from coupled aid to decoupled one linked to the...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/44864

Estimation of marginal effects using margeff
Provedor de dados: 31
Autores: Bartus,   Tamas.
This article describes the user-written program margeff, which enables the fast estimation of (average) marginal effects. Besides describing the program, this article offers a new discussion of some problems that are related to computation of marginal effects. I will argue that (1) marginal effects computed at means are not good approximations of average marginal effects, computed as means of marginal effects evaluated at each observations, if some of the parameter estimates are large; (2) both average marginal effects and marginal effects computed at means might produce wrong estimates for dummies that are part of a set of indicator variables indicating different categories of a single underlying variable; and (3) the use of marginal effects computed at...
Tipo: Journal Article
Palavras-chave: Margeff; Mfx; Average marginal effects; Marginal effects at the mean; Dummy variables; Squared variables; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117523

Does the Cause of Death Matter? The Effect of Dread, Controllability, Exposure and Latency on the Vsl
Provedor de dados: 31
Autores: Alberini,   Anna; Scasny,   Milan.
The Value of a Statistical Life is a key input into the calculation of the benefits of environmental policies that save lives. To date, the VSL used in environmental policy analyses has not been adjusted for age or the cause of death. Air pollution regulations, however, are linked to reductions in the risk of dying for cancer, heart disease, and respiratory illnesses, raising the question whether a single VSL should be applied for all of these causes of death. We conducted a conjoint choice experiment survey in Milan, Italy, to investigate this question. We find that the VSL increases with dread, exposure, the respondents’ assessments of the baseline risks, and experience with the specific risks being studied. The VSL is higher when the risk reduction is...
Tipo: Working or Discussion Paper
Palavras-chave: VSL; Conjoint Choice Experiments; Mortality Risk Reductions; Cost-benefit Analysis; Forced Choice Questions; Research Methods/ Statistical Methods; I18; J17; K32; Q51.
Ano: 2010
URL: http://purl.umn.edu/98097

Generalized power calculations for generalized linear models and more
Provedor de dados: 31
Autores: Newson,   Roger.
The powercal command can compute any one of the five quantities involved in power calculations from the other four. These quantities are power, significance level, detectable difference, sample number, and the standard deviation (SD) of the influence function, which is equal to the standard error multiplied by the square root of the sample number. powercal can take arbitrary expressions (involving constants, scalars, or variables) as input and calculate the output as a new variable. The user can therefore plot input variables against output variables, and this often communicates the tradeoffs involved better than a point calculation as output by the sampsi command. General formulas are given for calculating the SD of the influence function when the...
Tipo: Journal Article
Palavras-chave: Powercal; Power; Alpha; Significance level; Detectable difference; Detectable ratio; Sample number; Standard deviation; Influence function; Sample design; Generalized linear model; Proportion; Arithmetic mean; Algebraic mean; Geometric mean; Odds; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116258

ORDINARY AND GENERALIZED STOCHASTIC DOMINANCE: A PRIMER
Provedor de dados: 31
Autores: Zentner,   Robert P.; Greene,   Duty D.; Hickenbotham,   Terry L.; Eidman,   Vernon R.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1981
URL: http://purl.umn.edu/14184

SPECIFICATION SELECTION ISSUES IN MULTIVARIATE THRESHOLD AND SWITCHING MODELS
Provedor de dados: 31
Autores: Serra,   Teresa; Goodwin,   Barry K.
In this paper we consider two general approaches to the selection of thresholds in multivariate threshold models. The first criteria  ignores the cross equation correlation while the latter explicitly accounts for it. We focus on how model selection may be influenced by these alternative approaches and consider simulations of the alternative approaches.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19843

ECOLABELS AND ECONOMIC EFFICIENCY:  SOME PRELIMINARY RESULTS
Provedor de dados: 31
Autores: Clark,   Christopher D.; Russell,   Clifford S.
The public provision of information about the environmental performance of firms and products has generated considerable enthusiasm and become a common instrument of environmental regulation, even though the economic analysis of the social welfare properties of these policies is quite limited.  This paper proposes a model for examining these properties.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20338

Economic gains of improving soil fertility and water holding capacity with clay application: the impact of soil remediation research in northeast Thailand
Provedor de dados: 31
Autores: Saleth,   Rathinasamy Maria; Inocencio,   Arlene; Noble,   Andrew D.; Ruaysoongnern,   Sawaeng.
Declining productivity of agricultural soils in Northeast Thailand is a challenge facing land managers and farmers. A program was initiated in 2002 to investigate the potential role of incorporating clay-based materials into degraded soils as a means of enhancing productivity. This research report attempts to provide an ex-post assessment of the field level impact and economic viability of this approach, using the empirically derived estimates of the average income impacts that the application of bentonite or clay technology has generated among farm communities in Northeast Thailand. From an exclusive IWMI perspective, the impact evaluation suggests that the program has a net present value (NPV) of US$0.41 million with a benefit-cost ratio (BCR) of 2.44...
Tipo: Report
Palavras-chave: Soil improvement; Impact assessment; Research projects; Soil fertility; Sandy soils; Water holding capacity; Clay soils; Soil water relations; Soil management; Farming systems; Crop yield; Vegetable crops; Rice; Sorghum; Models; Statistical methods; Cost benefit analysis; Economic analysis; Economic aspects; Thailand; Agribusiness; Agricultural Finance; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Land Economics/Use; Production Economics; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53064

SPATIAL COMPETITION IN MILK PROCESSING INDUSTRY
Provedor de dados: 31
Autores: Wagner,   Peter; Huck,   Petra; Salhofer,   Klaus.
A model of uniform spatial pricing with Löschian conduct as developeded by Alvarez et al. is tested for the milk processing industry in Germany. Results confirm some oligopsony power in this spatial markets and a low pass-through of a retail price change to the farm.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20112

Inside the Black Box: Price Linkage and Transmission Between Energy and Agricultural Markets
Provedor de dados: 31
Autores: Du,   Xiaodong; McPhail,   Lihong Lu.
This study addresses the complex relationship between energy and agricultural markets—represented by corn, ethanol, and gasoline prices—particularly in light of the growth in biofuel production. Contemporaneous price response and transmission of market shocks are investigated in a simultaneous-equation system to disclose fundamental driving forces before and after the development of large-scale ethanol production. We use a dynamic conditional correlation multivariate GARCH model to demonstrate a strengthening relationship among corn, ethanol, and gasoline prices. We identify a structural change point at March 25, 2008 using the test by Bai and Perron (2003).  The strengthened market relationship is further illustrated by variance decomposition based on a...
Tipo: Conference Paper or Presentation
Palavras-chave: Corn; Ethanol; Gasoline; Structural break; Structural VAR; GARCH; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; C32; Q11; Q4.
Ano: 2011
URL: http://purl.umn.edu/103268

Behavioral and Welfare Effects of Tournaments and Fixed Performance Standard Contracts with Heterogeneous Agents: Some Experimental Evidence
Provedor de dados: 31
Autores: Wu,   Steven Y.; Nazaryan,   Natalie; Roe,   Brian E.; Sporleder,   Thomas L.
Experimental economics is used to compare tournaments (T) and fixed performance contracts (F) when agents have heterogeneous costs.  Our primary findings were: (1) There is no statistical difference in average pooled effort (effort by high ability and low ability subjects are pooled together to get an aggregate average) under T and F contracts, (2) on average, effort exerted by high ability agents is considerably higher than effort exerted by low ability agents under both types of contracts, (3) average pooled payoff for the subjects is affected by the type of contract used.  Statistical analysis of the results revealed that high ability subjects generally benefit from tournaments whereas low ability agents are harmed by tournaments.  Only in the case...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20103

Cointegrated Vector Autoregression Methods: An Application to Non-Normally Behaving Data on Selected U.S. Sugar-Related Markets
Provedor de dados: 31
Autores: Babula,   Ronald A.; Newman,   Douglas.
The methods of the cointegrated vector autoregression/error correction (VAR/VEC) model are applied to monthly U.S. markets for sugar and for sugar-using markets for confectionary, soft drink, and bakery products. Primarily a methods paper, Johansen and Juselius' methods are applied, with a special focus on addressing well-known issues that preclude statistically normal behavior, and that confront the modelled sugar-based data. In so doing, we illustrate the effectiveness and the benefits of modelling this sugar-related set of markets as a cointegrated system. Perhaps for the first time, cointegrated VEC model results are used to estimate crucial policy-relevant market parameters that drive the markets, as well as to illuminate the dynamic nature of the...
Tipo: Working or Discussion Paper
Palavras-chave: Cointegration; Sugar-based U.S. markets; Vector autoregression; Vector error correction models; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/15878

TRADITIONAL USES OF INPUT-OUTPUT MODELS IN WATERSHED PROGRAMS PLANNED UNDER PRINCIPLES AND GUIDELINES
Provedor de dados: 31
Autores: Sheets,   Keith.
This paper outlines the traditional uses of input-output (I/O) modeling in watershed programs planned under federal "Principles and Guidelines."  Generally, the national economic development costs and benefits are analyzed, and the I/O model is used to track on regional economic development impacts.  These regional impact estimates have little impact in project selection, but provide a selling tool to develop local support for project funding and implementation.
Tipo: Conference Paper or Presentation
Palavras-chave: IMPLAN; Input-Output; Watershed analysis; Water quality; NRCS; Conservation; Regional analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1998
URL: http://purl.umn.edu/20931

THE KEYS TO PREPARING SUCCESSFUL RESEARCH GRANT PROPOSALS
Provedor de dados: 31
Autores: Marchant,   Mary A.
This article seeks to demystify the competitive grant recommendation process of scientific peer review panels.  The National Research Initiative Competitive Grants Program (NRICGP) administered by the U.S. Department of Agriculture-Cooperative State Research, Extension, and Education Service (USDA-CSREES) serves as the focus of this article.  This article provides a brief background on the NRICGP and discusses the application process, the scientific peer review process, guidelines for grant writing, and ways to interpret reviewer comments if a proposal is not funded.  The essentials of good grant writing discussed in this article are transferable to other USDA competitive grant programs.
Tipo: Journal Article
Palavras-chave: Competitive grants; National research initiative competitive grants program; NRI; USDA-CSREES; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/15455

IMPOSING MONOTONICITY AND CURVATURE ON FLEXIBLE FUNCTIONAL FORMS
Provedor de dados: 31
Autores: Wolff,   Hendrik; Heckelei,   Thomas; Mittelhammer,   Ronald C.
Replaced with revised version of paper 05/29/04.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20256

MODELING AND SIMULATING PRICE, YIELD, AND PRODUCTION DISTRIBUTIONS FOR RISK ANALYSIS IN AGRICULTURE: DISCUSSION
Provedor de dados: 31
Autores: Zacharias,   Thomas P.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/15479

Multidisziplinäre Agentendefinitionen für Optimierungsmodelle
Provedor de dados: 31
Autores: Mohring,   Anke; Zimmermann,   Albert; Mack,   Gabriele; Mann,   Stefan; Ferjani,   Ali; Gennaio,   Maria-Pia.
Mit der Entwicklung von Multiagentenmodellen für die Landwirtschaft konnten betriebliche Entscheidungsverhalten und Interaktionen in die Simulation von kleineren Agrarregionen einbezogen werden. Wichtige methodische Impulse dazu kamen insbesondere von Wissen-schaftlerinnen und Wissenschaftlern aus Deutschland. Das sich im Aufbau befindende Modell SWISSland erhebt den Anspruch, die 50 000 Familienbetriebe der gesamten Schweizer Landwirtschaft in ihrer Heterogenität bezüglich Betriebs- und Kostenstrukturen sowie Verhal-tensweisen möglichst realitätsnah abzubilden, mit dem Ziel, die Simulation und Prognose des Strukturwandels zu verbessern. Dieser Beitrag beschreibt methodische Aspekte bei der Bil-dung der Agentenpopulation unter Verwendung verschiedener...
Tipo: Conference Paper or Presentation
Palavras-chave: Strukturwandel; Schweizer Landwirtschaft; Multi-Agentenmodell; Agentendefinition; Lineare Optimierung; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53273

MODEL APPLICATIONS FOR THE SPREAD OF NEW PRODUCTS IN HUNGARIAN MARKET CIRCUMSTANCES
Provedor de dados: 31
Autores: Orova,   Irma; Komaromi,   Nandor.
Getting a new product adopted - even if it has obvious advantages - is difficult. Many innovations require a long period from the time they become available to the time they are widely adopted. This study was conducted to determine some characteristics of new product diffusion processes in Hungarian market circumstances and compare them with the international findings. Having studied a wide variety of diffusion models applied in marketing, the Bass (1969) model seems to be internationally adopted. The parameter values of this model for different products in several countries are available in relative studies. The diffusion of different products were investigated on Hungarian statistical data (e.g. automobile, camcorder, subscription of cellular phone) and...
Tipo: Book
Palavras-chave: Forecasting; Diffusion models; Regression analyses; International Relations/Trade; Marketing; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43329

AGRICULTURAL ECONOMISTS, RESPONSE FUNCTIONS AND LACK-OF-FIT TESTS
Provedor de dados: 31
Autores: Battese,   George E.
The significance of statistical lack-of-fit tests for hypothesized response functions describing experimental data is traced in some of the recent agricultural economics literature. The statistical test is reviewed in a regression framework and it is shown that the test is related to testing that some of the coefficients in a linear regression model have zero values. Comments are made on the relationship between the lack-of-fit test and the coefficient of determination.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/9116

EXAMINATION OF ALTERNATIVE HETEROSCEDASTIC ERROR STRUCTURES USING EXPERIMENTAL DATA
Provedor de dados: 31
Autores: Mjelde,   James W.; Capps,   Oral, Jr.; Griffin,   Ronald C.
Impacts of alternative specifications for heteroscedastic error structures are examined by estimating various production functions for corn in Central Texas. Production- and profit- maximizing levels of input and the shape of the profit equation obtained from models not corrected for heteroscedasticity differed from those obtained from models corroded for heteroscedasticaity. Using the profit-maximizing input levels for each production function gave essentially the same estimated yield and profit, regardless of the specification for heteroscedasticity employed. Differences of up to one-quarter to one-third are noted, however, in the amount of profit-maximizing levels of input used, depending on the heteroscedasticity correction.
Tipo: Journal Article
Palavras-chave: Corn; Heteroscedasticity; Production function; Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/15329

Comparing Hedging Effectiveness: An Application of the Encompassing Principle
Provedor de dados: 31
Autores: Sanders,   Dwight R.; Manfredo,   Mark R.
An empirical methodology is developed for statistically testing the hedging effectiveness among competing futures contracts. The presented methodology is based on the encompassing principle, widely used in the forecasting literature, and applied here to minimum variance hedging regressions. Intuitively, the test is based on an alternative futures contract's ability to reduce residual basis risk by offering either diversification or a smaller absolute level of basis risk than a preferred futures contract. The methodology is easily extended to cases involving multiple hedging instruments and general hedge ratio models. Empirical applications suggest that the encompassing methodology can provide information beyond traditional approaches of comparing hedging...
Tipo: Journal Article
Palavras-chave: Cross-hedging; Encompassing; Hedging effectiveness; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/31136

An Integrated Assessment approach to linking biophysical modelling and economic valuation tools
Provedor de dados: 31
Autores: Kragt,   Marit Ellen; Bennett,   Jeffrey W.; Jakeman,   Tony.
Natural resource management (NRM) typically involves complex decisions that affect a variety of stakeholder values. Efficient NRM, which achieves the greatest net environmental, social and financial benefits, needs to integrate the assessment of environmental impacts with the costs and benefits of investment. Integrated assessment (IA) is one approach that incorporates the several dimensions of catchment NRM, by considering multiple issues and knowledge from various disciplines and stakeholders. Despite the need for IA, there are few studies that integrate biophysical modelling tools with economic valuation.  In this paper, we demonstrate how economic non-market valuation tools can be used to support an IA of catchment NRM changes. We develop a Bayesian...
Tipo: Report
Palavras-chave: Bayesian networks; Bio-economic modelling; Catchment management; Cost-benefit analysis; Environmental values; Integrated assessment and modelling; Non-market valuation; Riparian vegetation; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/94949

Is Agricultural Production Spillover the Rationale Behind NEPAD CAADP Framework? Spatial Econometric Approach
Provedor de dados: 31
Autores: Ulimwengu,   John M.; Sanyal,   Prabuddha.
Since 2003, the NEPAD Comprehensive Africa Agriculture Development Programme (CAADP) has been endorsed by African Heads of State and Governments as a vision for the restoration of agricultural growth, food security, and rural development in Africa. The program aims at stimulating agriculture-led development that eliminates hunger and reduces poverty and food insecurity. As pointed out by Etro (2001), the creation of a union or adoption of a common agenda should move the equilibrium toward the first best solution whenever policies generate spillovers. This arises because the ability of a common agenda to reduce the scope of free-riding behavior among member countries. In addition, increasing world market integration leads to more externalities which call...
Tipo: Conference Paper or Presentation
Palavras-chave: CAADP; Agriculture; Spatial panel model; Externalities; Spillover.; Agricultural and Food Policy; Research Methods/ Statistical Methods; C31; Q18.
Ano: 2010
URL: http://purl.umn.edu/60945

Input, Output Technical Efficiencies and Total Factor Productivity of Cereal Production in Tunisia
Provedor de dados: 31
Autores: Dhehibi,   Boubaker; Bahri,   Haithem; Annabi,   Mohamed.
In this paper, farm level technical efficiency of production and its determinants are investigated in a sample of 51 cereal producing farms located in the main cereal production region in Tunisia using a stochastic frontier production model.   Empirical findings show that labor input factor appears with a minimal effect on the production. The hypothesis of constant returns to scale is rejected at the 5% level of significance, and returns to scale were found to be decreasing. Moreover, the estimated coefficients in the technical inefficiency model are also as expected. The estimated coefficients of the instruction level of farmer and the rotation, technical variable, are negatives and statistically significant at 5% level, which indicates their positive...
Tipo: Presentation
Palavras-chave: Technical efficiency; Timmer index; Kopp index; TFP; Cereal farms; Tunisia; Agricultural and Food Policy; Farm Management; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; C43; O47; Q12.
Ano: 2012
URL: http://purl.umn.edu/122866

An economic evaluation of the osmoregulation gene technology to the Australian wheat industry
Provedor de dados: 31
Autores: Farquharson,   Robert J.; Morgan,   J.M.; Brennan,   John P.
Episodes of rainfall irregularity and soil moisture deficit have focused attention on the widespread limitation of water supply on winter cereal crop production in Australia. This has motivated a number of efforts at breeding for improved drought tolerance. A recent example involves a cellular adaptation which mitigates water loss through solute accumulation (osmoregulation or osmotic adjustment). An assessment of the performance of osmoregulation yield response in the presence of climate change found that wheat cultivars with this gene are unlikely to be adversely affected by hotter and drier conditions across the wheat belt. The results of an economic evaluation of potential future innovations (wheat cultivars) from the osmoregulation gene technology are...
Tipo: Conference Paper or Presentation
Palavras-chave: Economic evaluation; Wheat breeding; Osmoregulation; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/58446

OPTIMALITY AND SEPARABLE LINEAR PROGRAMMING:  AN ADDITIONAL REMINDER
Provedor de dados: 31
Autores: Kilmer,   Richard L.
The assumed global optimum solution obtained in linear programming is not an assumed characteristic of separable linear programming. Separable programming is non-linear programming and must possess certain sufficient conditions for a global optimum to be obtained. The global optimum conditions for separable programming are set forth.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1978
URL: http://purl.umn.edu/32410

DECOMPOSING WELL-BEING INDICATORS USING DISTRIBUTIONAL DATA
Provedor de dados: 31
Autores: Rahman,   Tauhidur; Mittelhammer,   Ronald C.
This paper makes two principal contributions: first, we propose a method for representing well-being aggregates and estimating population subgroup decompositions when data is available on population distributions across subgroups; second, we analyze the Quality of Life (QOL) of 'poor' and 'non-poor' population segments of 86 countries for the years 1980s and 1990s. The three major findings of this paper are as follows: First, nearly every well-being indicator declines as poor's population share increases; second, evidence of a significant difference in the QOL-poor's population share relationship between Asian and nonAsian countries is present for only few QOL indicators. In other words, the tendency for QOL to decline with increasing poor's population...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20232

A NOTE ON FIXING MISBEHAVING MATHEMATICAL PROGRAMS: POST-OPTIMALITY PROCEDURES AND GAMS-RELATED SOFTWARE
Provedor de dados: 31
Autores: McCarl,   Bruce A.
Mathematical programming formulations can yield faulty answers.  Models can be unbounded, infeasible, or optimal with unrealistic answers.  This article presents techniques for theory-based discovery of the cause of faulty models.  The approaches are demonstrated in the context of linear programming.  They have been computerized and interfaced using the General Algebraic Modeling System (GAMS), and are distributed free of charge through new GAMS versions and an outline web page.
Tipo: Journal Article
Palavras-chave: Debugging; GAMS software; Mathematical programming; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/15553

Adaptive kernel density estimation
Provedor de dados: 31
Autores: Van Kerm,   Philippe.
This insert describes the module akdensity. akdensity extends the official kdensity that estimates density functions by the kernel method. The extensions are of two types: akdensity allows the use of an “adaptive kernel” approach with varying, rather than fixed, bandwidths; and akdensity estimates pointwise variability bands around the estimated density functions.
Tipo: Journal Article
Palavras-chave: Adaptive kernel density; Local bandwidths; Variability bands; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116064

Validation of Participatory Farming Situation Identification: Case of Rainfed Rice Cultivation in Selected Area of West Bengal, India
Provedor de dados: 31
Autores: Goswami,   Rupak; Biswas,   Malay Sankar; Basu,   Debabrata.
Paper Presented at the 4th World Congress on Conservation Agriculture, 2009 at New Delhi, India
Tipo: Conference Paper or Presentation
Palavras-chave: Micro-farming situation; Farmers’ classification; Validation of indigenous classification; Rainfed rice; Appropriate technology; Community/Rural/Urban Development; Farm Management; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/97599

Calibration of an Agricultural Sector Model for the Region Khorezm (Uzbekistan) based on Survey Data
Provedor de dados: 31
Autores: Mueller,   Marc; Djanibekov,   Nodir.
The paper describes the approach used for the calibration of a price-endogenous programming model, developed for the agricultural sector of the region Khorezm in Uzbekistan. Extensive datasets from farm surveys were used to parameterize the model, which nevertheless tended to over-specialization and failed in general to replicate the observed levels of primal model variables. Calibration of the model with “Positive Mathematical Programming” approaches was not satisfying as the additional cost terms introduced to replicate the observed situation were in many cases not plausible and deviated substantially from any available information on cost structure of the agricultural production activities in the study region. After revising the survey data it became...
Tipo: Conference Paper or Presentation
Palavras-chave: Supply model calibration; Positive mathematical programming; Technology coefficient estimation; Agricultural and Food Policy; Research Methods/ Statistical Methods; C6; C8; Q1.
Ano: 2009
URL: http://purl.umn.edu/50354

Soybean Production in Brazil: Main Determinants of Property Sizes
Provedor de dados: 31
Autores: Silvestrin Zanon,   Raquel; Saes,   Maria Sylvia Macchione.
Economies of scale are present in soybean production. In Brazil, the two largest producing regions have properties with different dimensions. In particular, the average size of properties in the South is much smaller than those in the country´s Mid‐West region. This study analyzes the characteristics that favor small‐scale soybean‐producing properties in the country’s Southern region. Its theoretical framework is based on the Neoclassical theory and in Transaction Cost Economics. Questionnaires were applied to producers from the State of Rio Grande do Sul. A regression analysis shows the relation between the selected factors and property size. Results show that a greater use of labor, particularly of family employees, and the greater diversity of crops...
Tipo: Conference Paper or Presentation
Palavras-chave: Economies of scale; Soybean production; Small property; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Industrial Organization; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100476

Mata Matters: Precision
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. The Mata Matters column shows how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. In this quarter’s column, we look at the programming implications of the floating-point, base-2 encoding that modern computers use.
Tipo: Article
Palavras-chave: Mata; Floating point; Binary; Hexadecimal; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119244

Polarized Preferences In Homegrown Value Auctions
Provedor de dados: 31
Autores: Hurley,   Terrance M.; Yue,   Chengyan; Anderson,   Neil O.
Incentive compatible auction experiments, often referred to as homegrown value auctions, have become a popular tool for exploring how controversial product attributes and knowledge of these attributes affect consumer willingness to pay.  A common observation in these experiments is a prevalence of zero bids and bimodal bid distributions.  One possible explanation is that individuals have polarized preferences: find all products with a particular attribute desirable (positive polarization) or undesirable (negative polarization).  The purpose of this paper is to explore three questions.  Do polarized preferences exist?  If they do exist, can they be identified?  If they can be identified, does their identification provide useful information?  To answer these...
Tipo: Conference Paper or Presentation
Palavras-chave: Experiment; Auctions; Polarized Preferences; Invasive Plants; Homegrown Values; Demand and Price Analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods; D01; C18; C19; Q13.
Ano: 2011
URL: http://purl.umn.edu/103596

The Relationship between Alternative Unemployment Indicators and Agriculture in the Northern Great Plain
Provedor de dados: 31
Autores: Beresne,   Martha Bernadett; Kerekes,   Geza.
By adapting the alternative unemployment indicators series (U1-U6), which has long been in use in the United States and in many European countries, the authors endeavour to create their own indicators series using the Hungarian national statistical database as a basis to evaluate the results. This is performed both on the national and regional levels, meaning the socially and economically disadvantaged Northern Great Plain Region which is compared with the developed Western Transdanubian Region. The authors also attempt to establish a relationship between problems caused by unemployment in the Eastern part of the country and agriculture.
Tipo: Journal Article
Palavras-chave: Measurement of unemployment; Alternative unemployment indicators; Hungary; Northern Great Plain; Western Transdanubia; Agriculture.; Community/Rural/Urban Development; Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49194

Consumer preferences for ground beef packaged under a modified atmosphere
Provedor de dados: 31
Autores: Grebitus,   Carola; Jensen,   Helen H.; Sebranek,   Joseph G.; Roosen,   Jutta; Anders,   Sven M.
The main objective of this paper is to identify factors that determine consumers’ purchase decisions for ground beef offered with different packaging technologies. Consumers’ increasing knowledge about food technologies and changes in food labeling regulation influence agribusiness’ future product development and marketing strategies. Non-hypothetical choice experiments with ground beef, conducted in the USA, are used to quantify consumers’ valuation of technology-related attributes namely shelf life, color and packaging. How alternative types of information affect consumers’ WTP is of particular importance to processors and food safety analysts. This paper’s methodological contribution lies in applying advanced methods to elicit consumers' estimates of...
Tipo: Conference Paper or Presentation
Palavras-chave: Non-hypothetical choice experiments; Modified atmosphere packaging; Ground beef; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods; Q13; C9; D12.
Ano: 2009
URL: http://purl.umn.edu/51649

Changing Face of the Agri-Food Market: A Farmers Response and Possible Solutions from a Provincial Perspective
Provedor de dados: 31
Autores: Matoti,   Bongiswa; Vink,   Nick; Bienabe,   Estelle.
The rise of supermarkets, together with large-scale food manufacturers, has deeply transformed agri-food markets in many countries. This expansion has been evident in South Africa as well. Increasing attention has been and is being paid to the growth of supermarkets in countries outside of North America and Europe. Numerous studies have been carried out in developing countries, including South Africa. However, these studies, while identifying the growth of supermarkets and the changes in supply chains, notably downstream, that have been caused by this growth, have made relatively little progress in documenting the impacts at producer level and in identifying issues that need to be addressed. There is a special need for studies on how farmers and supporting...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Livestock Production/Industries; Marketing; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2008
URL: http://purl.umn.edu/52098

DYNAMIC STRATEGIC INTERACTION: A SYNTHESIS OF MODELING METHODS
Provedor de dados: 31
Autores: Richards,   Timothy J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/27983

COMPARISON OF METHODS FOR COLLECTING INPUT-OUTPUT FARM DATA:  A CASE STUDY FROM THE MANDARA MOUNTAIN INTEGRATED RURAL DEVELOPMENT PROJECT OF THE NORTHERN CAMEROON
Provedor de dados: 31
Autores: Niang,   Lamine.
Farm management research in developing countries originally focused on the collection and analysis of input-output type data obtained by survey methods for the purpose of improving resource allocation of individual farmers.  More recently, with the belief that this has not been a cost effective approach for developing countries, farm management research has broadened its objectives to provide information to provide a stronger foundation micro-level data that may be used for policy analysis and decision-making.  Some modifications of farm management research have been made to fit the situation in developing countries, usually by using more reliable (and more costly) methods, such as frequent visits for field measurement, for obtaining input-output data. The...
Tipo: Thesis or Dissertation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/11046

Stata tip 8: Splitting time-span records with categorical time-varying covariates
Provedor de dados: 31
Autores: Jann,   Ben.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116241

Speaking Stata: How to move step by: step
Provedor de dados: 31
Autores: Cox,   Nicholas J.
The by varlist: construct is reviewed, showing how it can be used to tackle a variety of problems with group structure. These range from simply doing some calculations for each of several groups of observations to doing more advanced manipulations making use of the fact that with this construct, subscripts and the built-ins _n and _N are all interpreted within groups. A fairly complete tutorial on numerical evaluation of true and false conditions is included.
Tipo: Journal Article
Palavras-chave: By; Sorting; Subscripts; True and false; _n; _N; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115953

Bayesian Inferences on Fourier Flexible Functional Form in Agricultural Production
Provedor de dados: 31
Autores: Featherstone,   Allen M.; Cader,   Hanas A.
Flexible functional forms are used to examine the characteristics of production technologies.  The Fourier functional form is capable of approximating any function globally, with the specified expansion. Unfortunately the exact form of the expansion is not known. The regularity conditions are likely to be violated without the exact form of expansion. In this paper we use a Bayesian approach to impose regularity conditions locally on a Fourier flexible functional from using agricultural production data.  Monotonicity, concavity, convexity and elasticities are compared.
Tipo: Conference Paper or Presentation
Palavras-chave: Cost function; Flexible functional form; Fourier series; Markov Chain Monte Carlo; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19228

AN ANALYTICAL REVIEW AND SYNTHESIS OF PREFERRED RESEARCH METHODS IN THE MSU FOOD SECURITY PROJECT
Provedor de dados: 31
Autores: Tefft,   James F.
The purpose of this study was to review the design and implementation of food security research in Mali, Rwanda, Senegal, Somalia, Zimbabwe during the first and selected later phases of the Food Security in Africa Cooperative Agreement between Michigan State University and the U.S. Agency for International Development. This paper discusses principles and techniques for designing research, formulating questions and developing questionnaires, conducting the field work, and disseminating the findings. The primary objective was to learn from the experiences of prior researchers and to synthesize the research methods that this project has found to be effective and which may be useful to future researchers in the development and execution of policy-relevant...
Tipo: Thesis or Dissertation
Palavras-chave: Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/10966

On the Solutions to Full Rank Three Gorman Systems
Provedor de dados: 31
Autores: LaFrance,   Jeffrey T.
This letter closes a gap in the set of solutions for the full rank three systems of Gorman Engel curves and presents a unified expression for the indirect preferences in this case.
Tipo: Working or Discussion Paper
Palavras-chave: Aggregation; Rank; Functional form; Integrability; Research Methods/ Statistical Methods; D12; E21.
Ano: 2005
URL: http://purl.umn.edu/25048

Impact of Income on Calorie and Nutrient Intakes: A Cross-Country Analysis
Provedor de dados: 31
Autores: Salois,   Matthew J.; Tiffin,   J. Richard; Balcombe,   Kelvin George.
The relationship between income and nutrient intake is explored. Nonparametric, panel, and quantile regressions are used. Engle curves for calories, fat, and protein are approximately linear in logs with carbohydrate intakes exhibiting diminishing elasticities as incomes increase. Elasticities range from 0.10 to 0.25, with fat having the highest elasticities. Countries in higher quantiles have lower elasticities than those in lower quantiles. Results predict significant cumulative increases in calorie consumption which are increasingly composed of fats. Though policies aimed at poverty alleviation and economic growth may assuage hunger and malnutrition, they may also exacerbate problems associated with obesity.
Tipo: Conference Paper or Presentation
Palavras-chave: Calorie and nutrient consumption; Food and nutrition policy; Income elasticities; Nonparametric; Panel; Quantile regression.; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; International Development; Research Methods/ Statistical Methods; C11; C14; C21; C23; O10; O47; Q18.
Ano: 2011
URL: http://purl.umn.edu/103647

Modelos de valoracion en ambiente de incertidumbre
Provedor de dados: 31
Autores: Bellver,   Jeronimo Aznar; Martinez,   Francisco Guijarro.
Resumen En este trabajo se presentan diversos modelos de valoración en ambiente de incertidumbre que combinan información precisa e imprecisa. En el desarrollo de los mismos se ha extendido la técnica de programación por metas básica a modelos que permiten considerar intervalos en la expresión del precio o las variables explicativas del mismo, enunciando una serie de proposiciones con las que se obtiene un completo conocimiento sobre el grado de adecuación entre los valores observados en el precio y los valores estimados por la función de valoración. Así mismo, se ha formulado un índice de adecuación que permite comparar diferentes modelos obtenidos mediante la metodología propuesta.  Palabras clave: Valoración, Incertidumbre, Programación por metas con...
Tipo: Journal Article
Palavras-chave: Valuation; Uncertainty; Interval goal programming; Research Methods/ Statistical Methods; C61; G12; Q14.
Ano: 2004
URL: http://purl.umn.edu/28731

The Relationship between Innovation and Marketing in SMEs in the EU Food Sector
Provedor de dados: 31
Autores: Banterle,   Alessandro; Cavaliere,   Alessia; Stranieri,   Stefanella; Carraresi,   Laura.
In the EU market small and medium sized enterprises (SMEs) represent the greater part of the food industry, specially with regard to traditional food products (TFPs). However, the growth of competition, connected mainly to globalisation, is making it very difficult for SMEs to survive. On the other hand, market opportunities for SMEs are connected to the evolution of consumer preferences toward food quality. To profit from such opportunities and to survive on the market, SMEs need to adapt their strategies, focusing on innovation aspects in order to meet consumer requirements and to compete on the market. The literature shows that firms’ market orientation and marketing capabilities are very important for innovation in food industries to guarantee that...
Tipo: Conference Paper or Presentation
Palavras-chave: Traditional food products; Innovation; Marketing management capabilities; Linear regression model; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Marketing; Production Economics; Research Methods/ Statistical Methods; L25; L66; M31; Q13.
Ano: 2010
URL: http://purl.umn.edu/100589

Agricultural Banking and Early Warning Models for the Bank Failures of the Late 2000s Great Recession
Provedor de dados: 31
Autores: Li,   Xiaofei; Escalante,   Cesar L.; Epperson,   James E.; Gunter,   Lewell F.
This paper is designed to validate if the agricultural sector can once again be labeled as an instigator of the late-2000s Great Recession using the early warning models technique. The empirical results indicate that exposure to agribusiness operations does not necessarily enhance a banks’ tendency to fail.
Tipo: Presentation
Palavras-chave: Agricultural Banking; Early warning signals; In-sample accuracy; Out-of-sample forecasting; Agricultural Finance; Research Methods/ Statistical Methods; G21; G32; G33; C01.
Ano: 2012
URL: http://purl.umn.edu/119656

On the Map
Provedor de dados: 31
Autores: Parker,   Timothy S.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/124191

STOCHASTIC DYNAMIC MODELING: DISCUSSION
Provedor de dados: 31
Autores: van Kooten,   G. Cornelis.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/32442

Understanding Heterogeneous Preferences in Random Utility Models: The Use of Latent Class Analysis
Provedor de dados: 31
Autores: Boxall,   Peter C.; Adamowicz,   Wiktor L.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/24090

A Dynamic Adoption Model with Bayesian Learning: Application to the U.S. Soybean Market
Provedor de dados: 31
Autores: Ma,   Xingliang; Shi,   Guanming.
Agricultural technology adoption is often a sequential process. Farmers may adopt a new technology in part of their land first and then adjust in later years based on what they learn from the earlier partial adoption. This paper presents a dynamic adoption model with Bayesian learning, in which forward-looking farmers learn from their own experience and from their neighbors about the new technology. The model is compared to that of a myopic model, in which farmers only maximize their current benefits. We apply the analysis to a sample of U.S. soybean farmers from year 2000 to 2004 to examine their adoption pattern of a newly developed genetically modified (GM) seed technology. We show that the myopic model predicts lower adoption rates in early years than...
Tipo: Conference Paper or Presentation
Palavras-chave: Technology adoption; Bayesian learning; Structural estimation; Agribusiness; Agricultural and Food Policy; Crop Production/Industries; Industrial Organization; Production Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2011
URL: http://purl.umn.edu/104577

Is Wal-Mart a Monopsony? Evidence from Local Labor Markets
Provedor de dados: 31
Autores: Bonanno,   Alessandro; Lopez,   Rigoberto A.
This paper measures the degree of monopsony power exerted by Wal-Mart over retail workers using a dominant-firm model and data in the 48 contiguous U.S. states for counties where the company operates, presenting for the first time a measure of the company’s anticompetitive behavior. Empirical results show that Wal-Mart’s monopsony power over workers varies significantly across the country, being higher in non-metro and rural counties, particularly in the south. For instance, Wal-Mart’s buying power index in labor markets in rural southern and central states is estimated to be 5% or higher while the impact on northeastern states’ retail wages is negligible.
Tipo: Conference Paper or Presentation
Palavras-chave: Wal-Mart; Monopsony power; Wages; Labor; Retailing; Community/Rural/Urban Development; Industrial Organization; Labor and Human Capital; Research Methods/ Statistical Methods; J42; L13; L81.
Ano: 2009
URL: http://purl.umn.edu/51289

DOES DISTANCE MAKE GOOD NEIGHBORS?  THE ROLE OF SPATIAL EXTERNALITIES AND INCOME IN RESIDENTIAL DEVELOPMENT PATTERNS
Provedor de dados: 31
Autores: Moreno-Sanchez,   Rocio del Pilar; Irwin,   Elena G.
Scattered residential development is explained using a theoretical model of residential location in which household interactions generate externalities that determine location choices.  Results demonstrate the role of income and heterogeneous preferences in generating this form of sprawl.  Among our findings is that rising income generates only temporary increases in sprawl.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19973

The Impact of Agricultural Conservation Easement on House Prices: A New Hedonic Price Model That Incorporates Spatial Autocorrelation and Spatial Heterogeneity
Provedor de dados: 31
Autores: Yoo,   James; Ready,   Richard C.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103421

A TEST OF BAYESIAN LEARNING FROM FARMER TRIALS OF NEW WHEAT VARIETIES
Provedor de dados: 31
Autores: Lindner,   Robert K.; Gibbs,   Melissa.
In this study, elicited estimates of farmers' subjective beliefs about the mean and variance of wheat variety yields were used to test propositions about Bayesian learning developed in the recent literature on innovation adoption. A series of empirical tests of the Bayesian adoption model were conducted using beliefs elicited from farm surveys conducted in 1982, 1983 and 1984. The results of the analysis neither confirm nor reject the Bayesian approach as a model of how farmers revise subjective beliefs, but do raise serious doubts about its realism, and suggest some issues requiring further investigation. Shortcomings in the elicitation techniques are discussed and the assumptions of the Bayesian model are reviewed.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/22497

Effects of alternative elicitation formats in discrete choice experiments
Provedor de dados: 31
Autores: Scheufele,   Gabriela; Bennett,   Jeffrey W.
An elicitation format prevalently applied in discrete choice experiments (DCEs) offers each respondent a sequence of choice tasks. Each choice task contains more than two choice options. Empirical evidence shows, however, that repeated choice tasks influence choice behaviour through institutional learning, fatigue, value learning and strategic response.   The study reported in this paper uses a split sample approach. This approach was based on field surveys using a single binary elicitation format. To expand the research on effects of sequential binary DCE formats, a majority vote baseline was used. We present evidence for effects caused by institutional learning, and by either strategic behaviour or value learning, after respondents answered repeated...
Tipo: Report
Palavras-chave: Discrete choice experiments; Split sample approach; Elicitation format; Incentive compatibility; Strategic behaviour; Learning effects; Panel mixed logit models; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/94948

EX ANTE NON-MARKET VALUATION FOR NOVEL PRODUCT: LITERATURE REVIEW
Provedor de dados: 31
Autores: Dofonsou,   Sika Gbegbelegbe; Lowenberg-DeBoer,   James.
This paper provides a critical review of the literature on non-market valuation methods to estimate the welfare impact of novel products; it is the first study to assess both observed data- and perception-based methods as non-market valuation methods. Observed databased methods include budgets, regression, mathematical programming, and simulation. Perceptions-based methods include the contingent valuation method, choice-based conjoint analysis and experimental methods. Findings imply that the preferred observed data-based method to estimate the ex ante economic impact of a new technology on the welfare of the farm household is a combination of simulation and mathematical programming. The preferred perception-based method for estimating the ex ante impact...
Tipo: Working or Discussion Paper
Palavras-chave: Staff working papers; Dept. of Agricultural Economics; Internet publications; Purdue University; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; B0; B4; C0; C6; R2.
Ano: 2008
URL: http://purl.umn.edu/6327

A FELDOLGOZOTT FUNKCIONÁLIS ÉLELMISZEREK FOGYASZTÓI SZEGMENTÁLÁSA ÉS MAGATARTÁSI JELLEMZŐI
Provedor de dados: 31
Autores: Lehota,   Jozsef; Komaromi,   Nandor.
A funkcionális élelmiszerek (friss és feldolgozott) hozzáadott értéket jelentenek a fogyasztók és a termelők részére egyaránt. A funkcionális élelmiszerek értékesítésének üteme a világban és az újonnan megjelenő piacokon – köztük Magyarországon – meghaladja az élelmiszerek értékesítésének átlagos növekedési ütemét, de még jelenleg is csak réspiacnak tekinthető. A fogyasztói magatartást a Black – Campbell (2006) által adaptált, funkcionális élelmiszerválasztási modell alapján elemeztük. A primer kutatásunk 1060 fős 15 év feletti országos reprezentatív mintára épült. Az adatbázist az eredeti változók alapján K-közép módszerrel klasztereztük. A hazai funkcionális élelmiszerfogyasztókat 5 szegmensbe soroltunk be, amelyeket összehasonlítottunk és jellemeztünk....
Tipo: Book
Palavras-chave: Funkcionális élelmiszer; Fogyasztói magatartás; Szegmentáció; Faktor és klaszterelemezés; Functional food; Consumer behaviour; Segmentation; Factor and cluster analyses; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43243

A JOINT LIVESTOCK-CROP MULTI-FACTOR RELATIVE PRODUCTIVITY APPROACH
Provedor de dados: 31
Autores: Jones,   Keithly G.; Arnade,   Carlos Anthony.
An output distance function conditional on the expansion of a second output is presented.  These distance functions are used to calculate distinct relative Total Factor Productivity (TFP) scores for two jointly produced products-livestock and crops for 27 countries.  From these, TFP growth and direction of growth are calculated.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35157

Spatial Economic Analysis in Data-Rich Environments
Provedor de dados: 31
Autores: Bell,   Kathleen P.; Dalton,   Timothy J.
Controlling for spatial effects in micro-economic studies of consumer and producer behavior necessitates a range of analytical modifications ranging from modest changes in data collection and the definition of variables to dramatic changes in the modeling of consumer and producer decision-making.  This paper discusses conceptual, empirical, and data issues involved in modeling the spatial aspects of economic behavior in data rich environments. Attention is given to established and emerging agricultural economic applications of spatial data and spatial econometric methods at the micro-scale.  Recent applications of individual and household data are featured, including models of land-use change at the urban-rural interface, agricultural land values, and...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; C21; Q10; Q12; Q15; Q56.
Ano: 2006
URL: http://purl.umn.edu/25241

AN APPLICATION OF LEARNING STYLE THEORY TO UNDERGRADUATE INSTRUCTION IN ACCOUNTING: A MINNESOTA EXAMPLE
Provedor de dados: 31
Autores: Nefstead,   Ward E.
This paper reports the results of a student learning style inventory by Flemming and Miller.  The survey was used in an introductory accounting course in addition to other curriculum materials to foster critical thinking.  A model for assessing and incorporating critical thinking is proposed.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 1998
URL: http://purl.umn.edu/20956

PREISTRANSMISSION FÜR KONSUMMILCH UND BUTTER IN DEN VERSCHIEDENEN DISTRIBUTIONSKANÄLEN DES LEBENSMITELEINZELHANDELS
Provedor de dados: 31
Autores: Holm,   Thore; Steinhagen,   Carsten; Loy,   Jens-Peter.
C1_4
Tipo: Conference Paper or Presentation
Palavras-chave: Preistransmission; Asymmetrie; Lebensmitteleinzelhandel; Distributionskanal; Milchmarkt; Konsummilch; Butter; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93954

Values of Ecosystem Services on Arable Land and the Role of Organic Farming
Provedor de dados: 31
Autores: Takatsuka,   Yuki; Cullen,   Ross; Wilson,   Matthew; Wratten,   Steve D.
Nationwide mail surveys implemented in November 2004 report New Zealand residents‟ willingness to pay for improvement in ecosystem services and support for organic farming on arable land. The surveys were split into two subsets: Canterbury, which is the region with most arable farming in the nation, and the other New Zealand regions. Analysis of the data reveals that Canterbury residents‟ willingness to pay for reduction in greenhouse gas emissions from arable farming is greater than their willingness to pay for improvement in water quality, while it is the opposite for residents in other regions. In addition, residents‟ willingness to fund an organic farming project that enhances certain ecosystem services is analyzed. The results provide insights for...
Tipo: Conference Paper or Presentation
Palavras-chave: Ecosystem Management; Organic Farming; Arable Farming; Choice Modeling.; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Environmental Economics and Policy; Farm Management; Institutional and Behavioral Economics; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98523

QUARTERLY ECONOMETRIC ANALYSIS OF U.S. SOYBEAN MARKET
Provedor de dados: 31
Autores: Chen,   Yu-Hui.
This article is the further development and refinement of quarterly models of U.S. field crops, drawing upon the theory of pricing, production, and storage under uncertainty.  The decisions of storage industry and farm production are taken into account.  The findings of this research are both methodological and empirical.
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1998
URL: http://purl.umn.edu/20881

Flexible quota constraints in positive mathematical programming models
Provedor de dados: 31
Autores: Buysse,   Jeroen; Van der Straeten,   Bart; Claeys,   Dakerlia; Lauwers,   Ludwig H.; Marchand,   Fleur L.; Van Huylenbroeck,   Guido.
To explain over- and underuse of available quota, Buysse et al. (2007) have integrated the shadow cost of the quota constraint in a quota flexibility function in a positive mathematical programming model. This method and central hypothesis, formulated and tested for the case of Belgian sugar beet farms, is in current paper extended and confirmed for the cases of Flemish dairy quota and manure emission rights. Despite the different organisation, objectives and implementations of the diverse quota systems, the results are similar. A higher utilisation of quota is significantly driven by the quota rent, but farm characteristics are also important and the effect declines with increasing quota rent. Regardless the quota, the dairy quota flexibility behaviour of...
Tipo: Conference Paper or Presentation
Palavras-chave: Quota; Flexibility; Positive Mathematical Programming; Farm model; Common Agricultural Policy; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6640

Von Neumann-Morgenstern Farsightedly Stable Sets in Two-Sided Matching
Provedor de dados: 31
Autores: Mauleon,   Ana; Vannetelbosch,   Vincent; Vergote,   Wouter.
We adopt the notion of von Neumann-Morgenstern farsightedly stable sets to predict which matchings are possibly stable when agents are farsighted in one-to-one matching problems. We provide the characterization of von Neumann-Morgenstern farsightedly stable sets: a set of matchings is a von Neumann-Morgenstern farsightedly stable set if and only if it is a singleton set and its element is a corewise stable matching. Thus, contrary to the von Neumann-Morgenstern (myopically) stable sets, von Neumann-Morgenstern farsightedly stable sets cannot include matchings that are not corewise stable ones. Moreover, we show that our main result is robust to many- to-one matching problems with responsive preferences.
Tipo: Working or Discussion Paper
Palavras-chave: Matching Problem; Von Neumann-Morgenstern Stable Sets; Farsighted Stability; Research Methods/ Statistical Methods; C71; C78.
Ano: 2008
URL: http://purl.umn.edu/6287

THE RHETORIC OF DUALITY
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
Agricultural economists’' view of duality has often assumed the characteristics of an ambivalent relation. During the eighties, several authors published papers which put in doubt this or that aspects of duality. This study emphasizes the notion that duality is a time-honored approach suitable for solving problems that can be expressed mathematically. Contrary to many assertions that appeared in the agricultural economics literature, duality does not seem to suffer from any theoretical limitations any more than does the formulation of the primal problem. The article presents two problems that can be solved with dual methods. The authors are incapable of deriving the same results using primal approach.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/30933

Diskussionsbeitrag zu: Christian H.C.A. Henning und Jerzy Michalek: Ökonometrische Methoden der Politikevaluation: Meilenstein für eine sinnvolle Agrarpolitik der 2. Säule oder akademische Fingerübung? Agrarwirtschaft 57 (2008), Heft 3/4
Provedor de dados: 31
Autores: Margarian,   Anne.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97704

Correct (and misleading) arguments for using market based pollution control policies
Provedor de dados: 31
Autores: Karp,   Larry S.
Disagreement over the form of regulation of greenhouse gasses motivates a comparison of market based and command and control policies. More efficient policies can increase aggregate marginal abatement cost, resulting in higher emissions. Multiple investment equilibria and “regulatory uncertainty” arise when firms anticipate command and control policies. Market based policies eliminate this uncertainty. Command and control policies cause firms to imitate other firms’ investment decisions, leading to similar costs and small potential efficiency gains from trade. Market based policies induce firms to make different investment decisions, leading to different costs and large gains from trade. We imbed the regulatory problem in a “global game” and show that the...
Tipo: Working or Discussion Paper
Palavras-chave: Tradable permits; Coordination games; Multiple equilibria; Global games; Regulatory uncertainty; Climate change policies; California AB32; Environmental Economics and Policy; Research Methods/ Statistical Methods; C79; L51; Q58.
Ano: 2008
URL: http://purl.umn.edu/42868

Agricultural Knowledge and Information Systems: A Network Analysis
Provedor de dados: 31
Autores: Kaine,   Geoff; Doyle,   Brendan; Reeve,   Ian; Lees,   Jim.
Röling and others argue that research and extension should not be seen as separate processes involving distinct institutions which must somehow be linked. Rather, scientists, specialists, extension workers, consultants and producers should be seen as participants in a single agricultural knowledge and information system (AKIS). This perspective on research, extension and adoption as activities that occur within a network offers new insights into the way in which technology transfer occurs, and new ideas as to how to increase the rate of adoption of new ideas and techniques in farming. In this study, we use network management theory and applied network analysis to operationalise the concept of an AKIS and to test the relationships between system...
Tipo: Presentation
Palavras-chave: Agricultural extension; Technology transfer; Network analysis.; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/123823

Decomposing inequality and obtaining marginal effects
Provedor de dados: 31
Autores: Lopez-Feldman,   Alejandro.
This article describes a user-written command, descogini, that decomposes the Gini coefficient by income source and allows the calculation of the impact that a marginal change in a particular income source will have on inequality. descogini can be used with bootstrap to obtain standard errors and confidence intervals.
Tipo: Journal Article
Palavras-chave: Descogini; Gini; Gini decomposition by income source; Inequality; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117560

Production function estimation in Stata using inputs to control for unobservables
Provedor de dados: 31
Autores: Petrin,   Amil; Poi,   Brian P.; Levinsohn,   James.
A key issue in the estimation of production functions is the correlation between unobservable productivity shocks and input levels. Profit-maximizing firms respond to positive productivity shocks by expanding output, which requires additional inputs. Negative shocks lead firms to pare back output, decreasing their input usage. Olley and Pakes (1996) develop an estimator that uses investment as a proxy for these unobservable shocks. More recently, Levinsohn and Petrin (2003a) introduce an estimator that uses intermediate inputs as proxies, arguing that intermediates may respond more smoothly to productivity shocks. This paper reviews Levinsohn and Petrin’s approach and introduces a Stata command that implements it.
Tipo: Journal Article
Palavras-chave: Levpet; Production functions; Productivity; Endogeneity; GMM estimator; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116231

Choosing an appropriate real-life measure of effect size: the case of a continuous predictor and a binary outcome
Provedor de dados: 31
Autores: Conroy,   Ronan M.
A case study of data on age and pregnancy is used to point up some morals for practicing data analysts, including the superiority of regression over t tests, exploratory scatterplot smoothing as a key method of checking form of relationship, and the value of logistic regression followed by adjust as a way of getting at the numbers of most interest.
Tipo: Journal Article
Palavras-chave: Adjust; Correlation; Logistic regression; Regression; Scatterplot smoothing; T tests; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116011

EXAMINING FOOD CONSUMPTION IN JAPAN UNDER LIFE-CYCLE HYPOTHESIS: IMPLICATION FROM CROSS-SECTIONAL DATA
Provedor de dados: 31
Autores: Bittencourt,   Maurício Vaz Lobo; Teratanavat,   Ratapol P.; Chern,   Wen S.
This study estimates a cross-sectional model through a theoretically consistent Almost Ideal Demand System (AIDS) to examine the economic and demographic determinants of food consumption patterns in Japan over life-cycle periods. Results show key factors that explain such behavior, including family size, number of children, lifestyle and health concern.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20070

Stata tip 47: Quantile–quantile plots without programming
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119277

Flexible parametric alternatives to the Cox model: update
Provedor de dados: 31
Autores: Royston,   Patrick.
Royston (2001) and Royston and Parmar (2002) introduced flexible parametric models for survival analysis, implemented in Stata through the ado-file stpm (Royston 2001). In the present article, stpm is updated to Stata 8.1 and has been shown to work correctly with Stata 8.2. To increase the reliability of the estimation procedure, the basis functions of the splines used to approximate the baseline distribution function have been orthogonalized.
Tipo: Journal Article
Palavras-chave: Parametric survival analysis; Proportional hazards; Proportional odds; Regression splines; Orthogonal basis functions; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116215

An Estimation of the Efficient Size of Sugarcane Enterprises for Farmers in Trinidad
Provedor de dados: 31
Autores: Palmer,   Donald W.; Pemberton,   Carlisle A.
This research paper provides an estimation of the efficient size of operation for sugarcane farmers in Trinidad.  The estimates were based on a sample of two hundred and twenty-seven farmers selected from a cost of sugarcane production survey. To identify the efficient size of operation the ordinary least square estimation technique was used.  The identification of the efficient size of operation allowed a test of the hypothesis that the minimum point on the long run average cost curve was significantly greater than the  average enterprise size of six acres.  The long run total cost curve was estimated and the cubic functional form provided the best fit based on both the adjusted R2 and the result from the Wald test.  The results of the estimation process...
Tipo: Journal Article
Palavras-chave: Cost function; Cost elasticity; Efficient size; Sugar-cane; Trinidad; Agribusiness; Farm Management; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/36807

ENDOGENOUS RECOMBINANT GROWTH
Provedor de dados: 31
Autores: Tsur,   Yacov; Zemel,   Amos.
We extend Weitzman's (1998) recombinant growth framework to include endogenous R&amp;D decisions. The analysis is carried out in the (knowledge-capital) state space by means of two characteristic curves: one is identified as a turnpike along which growing economies evolve; the other attracts stagnating economies. Sustained growth depends on a condition relating the slopes of the characteristic curves as well as on a minimal endowment requirement. A growing economy reaches the turnpike at a most rapid R&amp;D rate and evolves along it thereafter. In the long run, the rate of growth and the income shares devoted to R&amp;D, saving and consumption approach constant values that depend on the asymptotic characteristic slopes.
Tipo: Working or Discussion Paper
Palavras-chave: Knowledge generation; Combined ideas; Endogenous R&amp;D; Balanced growth; Research Methods/ Statistical Methods; C61; O31; O41.
Ano: 2006
URL: http://purl.umn.edu/7135

Testing for cross-sectional dependence in panel-data models
Provedor de dados: 31
Autores: De Hoyos,   Rafael E.; Sarafidis,   Vasilis.
This article describes a new Stata routine, xtcsd, to test for the presence of cross-sectional dependence in panels with many cross-sectional units and few time-series observations. The command executes three different testing procedures—namely, Friedman’s (Journal of the American Statistical Association 32: 675–701) (FR) test statistic, the statistic proposed by Frees (Journal of Econometrics 69: 393–414), and the cross-sectional dependence (CD) test of Pesaran (General diagnostic tests for cross-section dependence in panels [University of Cambridge, Faculty of Economics, Cambridge Working Papers in Economics, Paper No. 0435]). We illustrate the command with an empirical example.
Tipo: Article
Palavras-chave: Xtcsd; Panel data; Cross-sectional dependence; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119240

AUSWIRKUNGEN DER FISCHLER-REFORM UND DER BLAUZUNGENKRANKHEIT AUF DIE EUROPÄISCHEN KÄLBERMÄRKTE
Provedor de dados: 31
Autores: Ihle,   Rico; Brümmer,   Bernhard; Thompson,   Stanley R.
C1_3
Tipo: Conference Paper or Presentation
Palavras-chave: Entkopplung; Europäische Union; Faktormärkte; Fischlerreform; GAP; Kälbermarkt; Marktintegration; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93953

A generic function evaluator implemented in Mata
Provedor de dados: 31
Autores: Stovring,   Henrik.
Background: When implementing new statistical procedures, there is often a need for simple—and yet computationally efficient—ways of numerically evaluating composite distribution functions. If the statistical procedure must support calculations for censored and noncensored cases, those calculations should be carried out using efficient computational implementations of both definite and indefinite integrals (e.g., calculation of tail areas of distribution functions).  Method: We developed a generic function evaluator such that users may specify a function using reverse Polish notation. As its argument the function evaluator takes a matrix of pointers and then applies the rows of this matrix to its internally defined stack of pointers. Accordingly, each row...
Tipo: Article
Palavras-chave: Rpnfcn(); RPN; Mata; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119293

Economic Considerations in the Design and Analysis of Agricultural Experiments
Provedor de dados: 31
Autores: Dillon,   John L.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1966
URL: http://purl.umn.edu/9205

ECONOMICS OF SOYBEAN BIOTECHNOLOGY IN THE LIVESTOCK INDUSTRY
Provedor de dados: 31
Autores: Chung,   Chanjin; Pettigrew,   James E.
Using a linear programming model, this study evaluates the effects of commercializing new biotech-soybean varieties on the livestock producers’ feed costs and formulations.  Major findings include: (1) development of new alternative soybeans would benefit poultry meat producers more than egg and pig meat producers; (2) new soybean meals would save more feed costs in starter diets than in either grower or finisher diets; and (3) economic advantages of new soybean meals were highly sensitive to the availability of alternative protein sources but less sensitive to changes in ingredient prices.
Tipo: Journal Article
Palavras-chave: Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/34507

Modeling the Impact of Food Safety Information with No Information
Provedor de dados: 31
Autores: Mazzocchi,   Mario.
This paper aims to propose a stochastic approach to measure the time pattern of a food scare, which does not require the inclusion of additional explanatory variables such as a news index. The application is based on the 1982 Heptachlor milk contamination in Oahu, Hawaii.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20252

Testing Choice Experiment for Benefit Transfer
Provedor de dados: 31
Autores: Colombo,   Sergio; Calatrava-Requena,   Javier; Conzalex-Roa,   M.C.
Benefit transfer is a cost-effective method for estimating the value of environmental goods that relies on information obtained in previous studies. The multi-attribute approach of choice experiment should provide advantages in terms of benefit transfer allowing differences in environmental improvements between sites as well as differences in socio-economic and attitude characteristics between respondent populations. Furthermore, choice experiment allows the estimation of implicit prices and the welfare change for many scenarios. If the transferability of these values is confirmed, that would be good news for benefit transfer practitioners. This paper investigates the capability of choice experiment method to be used in environmental benefit transfer.
Tipo: Conference Paper or Presentation
Palavras-chave: Choice experiment; Benefit transfer; Soil erosion; Research Methods/ Statistical Methods; Q30.
Ano: 2005
URL: http://purl.umn.edu/24747

Parametric farm performance and efficiency methodology: Stochastic Frontier Analysis
Provedor de dados: 31
Autores: Bakucs,   Lajos Zoltan.
There is a continuously growing literature on the agricultural transformation in Central and Eastern European countries (see some surveys in Brooks and Nash 2002; Rozelle and Swinnen 2004). The research has focused on various aspects of transition, including land reform, farm restructuring, price and trade liberalisation, but even though Farm Accountancy Data Network (FADN) data are now available for some years, there are only a few studies (e.g. Bakucs et al. 2010, Fogarasi and Latruffe, 2007, Baráth et al., 2009) focusing on Hungarian farm performance. The objective of this paper is to shed light on some methodological issues that are needed to study Hungarian farm performance. Here we consider one aspect of farm performance, namely technical efficiency....
Tipo: Journal Article
Palavras-chave: Farm technical efficiency; Stochastic Frontier Analysis; Methodology; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/102404

Stata tip 32: Do not stop
Provedor de dados: 31
Autores: Jenkins,   Stephen P.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117580

The diffusion of greenhouse agriculture in northern Thailand: Combining econometrics and agent-based modeling
Provedor de dados: 31
Autores: Schreinemachers,   Pepijn; Berger,   Thomas; Sirijinda,   Aer; Praneetvatakul,   Suwanna.
This paper studies the diffusion of greenhouse agriculture in a watershed in the northern uplands of Thailand by applying econometrics and agent-based modeling in combination. Adoption has been rapid by farmers in the central valley of the watershed, while farmers at higher altitudes, lacking transferable land titles that could serve as mortgage collateral, have been unable to obtain loans for greenhouse investment. The objectives of the paper are both methodological and empirical. On the methodological side, it shows that econometrically estimated models of farm household behavior are useful to design and to parameterize an agent-based model. On the empirical side, simulation results show that if mortgage collateral would not be required, then adoption in...
Tipo: Conference Paper or Presentation
Palavras-chave: Innovation diffusion; Technology adoption; Multi-agent systems; MP-MAS; Agricultural and Food Policy; Consumer/Household Economics; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Q12; Q16; C6.
Ano: 2009
URL: http://purl.umn.edu/50899

AN INDEX METHOD FOR SELECTING REPRESENTATIVE CITIES OF A TARGET MARKET
Provedor de dados: 31
Autores: Shehata,   Sabry A.
An index was developed to rank U.S. metropolitan areas according to overall similarities in their socio-economic characteristics to the U.S. average. This index is given as a solution to matching a representative city or market area to a target market as well as matching a group of cities which are similar to each other. The index shows stability in ranking these cities with different consumption data for similar products and proves to be a promising approach whenever the researcher must find a group of cities which are similar to each other and to the target market.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1979
URL: http://purl.umn.edu/32294

Nonlinear Models of Exchange Rate Pass-Through in International Forest Product Markets
Provedor de dados: 31
Autores: Onel,   Gulcan; Prestemon,   Jeffrey P.; Holt,   Matthew T.; Goodwin,   Barry K.
Tipo: Conference Paper or Presentation
Palavras-chave: Forest Products; International Price Linkages; Exchange Rate Pass-Through; Vector Error Correction Models (VECM); Thresholds; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61620

Evaluation of rural development programs after Poland’s accession to the EU: regional CGE approach
Provedor de dados: 31
Autores: Zawalinska,   Katarzyna.
rural policy, pillar 2, Poland
Tipo: Conference Paper or Presentation
Palavras-chave: Rural development policy; Regional computable general equilibrium model; Poland; Agricultural and Food Policy; Community/Rural/Urban Development; Research Methods/ Statistical Methods; Q18; R13; H43; O1.
Ano: 2009
URL: http://purl.umn.edu/51342

A SYSTEM-WIDE APPROACH FOR ANALYZING JAPANESE WHEAT IMPORT ALLOCATION DECISIONS
Provedor de dados: 31
Autores: Schmitz,   Troy G.; Wahl,   Thomas I.
This paper develops and implements an import allocation model based on Theil's system-wide approach to demand and tests the assumption of blockwise dependence and uniform substitutability among different sources and types of wheat imported by Japan.
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20780

SOME OLD TRUTHS REVISITED
Provedor de dados: 31
Autores: Piggott,   Roley R.
The primary objective in this paper is to 'promote' the use of equilibrium displacement modeling, or comparative static analysis of general function models, as a research tool in agricultural price and policy analyses. This is by no means a new tool, but it does seem to be used much less in Australia than it is in the US where it has been the basis of several important journal papers in recent times, The paper includes applications to: (a) reproduce important results obtained by Euse (1958) regarding total elasticities; and (b) examine the price premium argument that has been advanced in favour of single-desk selling arrangements. The latter is the secondary objective in the paper. Whilst equilibrium displacement modelling has its shortcomings, it is a...
Tipo: Journal Article
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/22504

A Sequential Rationality and Efficiency Test of U.S. Department of Agriculture Program Crop Price Estimates: Rice, Wheat, and Soybeans
Provedor de dados: 31
Autores: No,   Sung Chul; Salassi,   Michael E.
This paper examines the USDA price estimates of rice, wheat, and soybeans and whether spot commodity prices reflect price information embodied in USDA estimates. Results indicate that the monthly USDA estimates are failed to meet a rationality condition. Rice and wheat actual prices marginally incorporate the information embodied in USDA past price estimates.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods; Crop Production/Industries.
Ano: 2008
URL: http://purl.umn.edu/6814

Data inspection using biplots
Provedor de dados: 31
Autores: Kohler,   Ulrich; Luniak,   Magdalena.
Biplots display interunit distances, as well as variances and correlations of variables of large datasets. They can be used as a tool to reveal clustering, multicollinearity, and multivariate outliers, and to guide the interpretation of principal component analyses (PCA). This article describes the uses of biplots and its implementation in Stata.
Tipo: Journal Article
Palavras-chave: Biplots; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117513

Peer Effect, Risk-Pooling and Status Seeking: Which Matters to Gift Spending Escalation in Rural China?
Provedor de dados: 31
Autores: Chen,   Xi; Zhang,   Xiaobo.
This paper is based on our ongoing joint work with Ravi Kanbur. Xi Chen is grateful to Ravi Kanbur for invaluable comments, guidance and encouragement. For comments and suggestions, please direct correspondence to Xi Chen at xc49@cornell.edu.
Tipo: Conference Paper or Presentation
Palavras-chave: Social Network; Peer Effect; Risk-pooling; Status Seeking; Gift-giving; Ceremony; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Development; Public Economics; Research Methods/ Statistical Methods; Risk and Uncertainty; I32; J22; D13; D63.
Ano: 2011
URL: http://purl.umn.edu/103643

Incorporating Spatial Complexity into Economic Models of Land Markets and Land Use Change
Provedor de dados: 31
Autores: Chen,   Yong; Irwin,   Elena G.; Jayaprakash,   Ciriyam.
Recent work in regional science, geography, and urban economics has advanced spatial modeling of land markets and land use by incorporating greater spatial complexity, including multiple sources of spatial heterogeneity, multiple spatial scales, and spatial dynamics. Doing so has required a move away from relying solely on analytical models to partial or full reliance on computational methods that can account for these added features of spatial complexity. In the first part of the paper, we review economic models of urban land development that have incorporated greater spatial complexity, focusing on spatial simulation models with spatial endogenous feedbacks and multiple sources of spatial heterogeneity. The second part of the paper presents a spatial...
Tipo: Article
Palavras-chave: Urban growth; Urbanization; Land development; Spatial dynamics; Heterogeneity; Agent-based models; Spatial interactions; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/120644

MODELING REGIONAL ALTERNATIVE MANAGEMENT SCENARIOS WITH FUTURE CLIMATIC CHANGE INFLUENCE ACCOUNTING
Provedor de dados: 31
Autores: Romanenko,   Irina.
The methodology of construction of the alternative agricultural production scenarios at regional level includes profitability and feasibility analysis based on assessment the effect of global climate change on productivity parameters for the main agricultural crops, cost efficiency of crop growing and cattle breeding. To propose links between economic adaptation to climate change and carbon (organic C) stock management in agricultural ecosystems for use in developing long-term adoption strategies at regional level, the regional economic-mathematical model was elaborated. It allows us to unify soil C driving variables and human environment factors.
Tipo: Conference Paper or Presentation
Palavras-chave: Regional Economic-Mathematical Model; Regional Alternative Management Scenarios; Climate change; Linear Programming Task; Model of humus balance; European Russia; Crop Production/Industries; Environmental Economics and Policy; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6669

Agricultural Research Management and the Ex Ante Evaluation of Research Proposals : A Review
Provedor de dados: 31
Autores: Greig,   I.D.
A review of the ex ante evaluation of research proposals is structured in the wider context of research management. Five functions of research management are identified; initiation, evaluation, selection, implementation and control, and dissemination. After considering the relative weights given to these functions In the. literature, it is concluded that the past emphasis on selection should, for agricultural research, give way to more on evaluation. A review of the literature indicates that ex ante evaluation of research is feasible, whether using simple expected value or more costly and complex probabilistic models. The cost of evaluation should be balanced against investment in both the other research functions and the proposals themselves.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1981
URL: http://purl.umn.edu/12424

A BAYESIAN FRAMEWORK FOR OPTIMAL INPUT ALLOCATION WITH AN UNCERTAIN STOCHASTIC PRODUCTION FUNCTION
Provedor de dados: 31
Autores: Griffiths,   William E.
A Bayesian approach is used to provide a framework for optimal input allocation for a stochastic production function with uncertain parameters. The chosen production function is a single-input version of a function which can exhibit positive or negative marginal risk. The sensitivity of optimal input allocation to the degree of risk aversion, the marginal risk parameter, and the assumed level of uncertainty about the parameters is examined. Using an example problem it is shown that parameter uncertainty will not always lead to a lower input level when a producer is risk averse. Some problems with the production function specification are uncovered, as is the incompatibility of some expected utility and stochastic assumptions.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1986
URL: http://purl.umn.edu/22898

THE STATISTICAL ANALYSIS OF DISCRETE-RESPONSE CV DATA
Provedor de dados: 31
Autores: Hanemann,   W. Michael; Kanninen,   Barbara.
Figures are not available for this Web version.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/25022

Implementing tests with correct size in the simultaneous equations model
Provedor de dados: 31
Autores: Moreira,   Marcelo J.; Poi,   Brian P.
In this paper, we propose a fix to the size distortions of tests for structural parameters in the simultaneous equations model by computing critical value functions based on the conditional distribution of test statistics. The conditional tests can then be used to construct informative confidence regions for the structural parameter with correct coverage probability. Commands to implement these tests in Stata are also introduced.
Tipo: Journal Article
Palavras-chave: Instrumental variables; Weak instruments; Similar tests; Score test; Wald test; Likelihood-ratio test; Confidence regions; 2SLS estimator; LIML estimator; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116032

Stata tip 63: Modeling proportions
Provedor de dados: 31
Autores: Baum,   Christopher F.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122595

Stigler's approach to recovering the distribution of first significant digits in natural data sets
Provedor de dados: 31
Autores: Lee,   Joanne; Cho,   Wendy K.; Judge,   George G.
In 1881, Newcomb conjectured that the first significant digits (FSDs) of numbers in statistical tables would follow a logarithmic distribution with the digit “1” occurring most often. However, because Newcomb’s proposal was not presented with a theoretical basis, it was not given much attention. Fifty-seven years later, Benford argued for the same principle and showed it was relevant to a large range of data sets, and the logarithmic FSD distribution became known as “Benford’s Law.” In the mid-1940s, Stigler claimed Benford’s Law contained a theoretical inconsistency and supplied an alternative derivation for the distribution of FSDs. In this paper, we examine the theoretical basis of the Stigler distribution and extend his reasoning by incorporating FSD...
Tipo: Working or Discussion Paper
Palavras-chave: Benford's law; Stigler's law; Power law; Maximum entropy; Distance measures; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; C10; C24.
Ano: 2009
URL: http://purl.umn.edu/47000

Valuing the non-market production of agriculture
Provedor de dados: 31
Autores: Ahlheim,   Michael; Fror,   Oliver.
As a consequence of the negotiations for a new agricultural policy of the EU the multifunctionality of agricultural production has come into new prominence in the public. The philosophy that subsidies for the agricultural sector should be calculated not only by agricultural market production but also according to agricultural noncommodity production like e.g. the conservation of the countryside, makes it necessary to assess the social value of this part of agricultural production. In this paper we scrutinize the welfare theoretical background of the economic valuation of non-market production as well as the existing practical valuation techniques. Further, the applicability of these techniques to the valuation of agricultural noncommodity production is...
Tipo: Journal Article
Palavras-chave: Valuation of non-market goods; Cost-benefit analysis; Contingent valuation; Multifunctionality of agriculture; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/98080

Transparent Food and Consumer Trust
Provedor de dados: 31
Autores: Kriege-Steffen,   Astrid; Boland,   Hermann; Lohscheidt,   Julia; Schneider,   Flurina; Stolze,   Matthias.
Nowadays the food market is very complex and anonymous. Consequently, consumer trust in food has become a key issue for food choice. For example, the production process of food is not always transparent for consumers. To provide more transparency and to enhance consumer trust, different initiatives communicating traceability to the consumers exist. Visualised traceability systems such as the initiative ‘Bio mit Gesicht’ allow consumers to gather information about the farmer who has produced the food as well as information about his farm and family. This study explores consumer trust in organic food, the impact of trust in the buying decision and the effectiveness of enhancing consumer trust by communication strategies on traceability. The research is...
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer trust; Organic food; Traceability systems; Structure‐laying‐technique; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100504

Semi-nonparametric estimation of extended ordered probit models
Provedor de dados: 31
Autores: Stewart,   Mark B.
This paper presents a semi-nonparametric estimator for a series of generalized models that nest the ordered probit model and thereby relax the distributional assumption in that model. It describes a new Stata command for fitting such models and presents an illustration of the approach.
Tipo: Journal Article
Palavras-chave: Ordered response models; Ordered probit; Semi-nonparametric estimation; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116207

Using the market opportunities in the food economy’s foreign trade – measurement of success based on the potential balance
Provedor de dados: 31
Autores: Wagner,   Hartmut.
This work was aimed at analysing the effects of the sudden food price explosion followed by price crash which occurred recently on the foreign trade of the food economy. Comparison of the balances of the different countries was difficult due to the differences in the absolute dimensions; therefore a new method was introduced. Firstly, with the help of the “food economic foreign trade profile” extent to which the different product categories (divided by main product groups or by degree of processing) contribute to the foreign trade balance of the given country’s food economy was examined. In the second step, with the help of “profile indexing”, the extent to which the country in question was able to turn to profit the market opportunities offered by the...
Tipo: Journal Article
Palavras-chave: Crisis; Food products; Foreign trade; Price explosion; Cereals; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93120

O USO DA ANÁLISE DE CONTEÚDO COMO UMA FERRAMENTA PARA A PESQUISA QUALITATIVA: DESCRIÇÃO E APLICAÇÃO DO MÉTODO
Provedor de dados: 31
Autores: Silva,   Cristiane Rocha; Gobbi,   Beatriz Christo; Simao,   Ana Adalgisa.
The purpose of this present rehearsal is the conceptual explanation of the method of content analysis used in the qualitative research and its application in the social sciences. Two theoretical roads are traveled for the construction of that purpose. The first is based on the reference to the Theory of the Social Representations and the second to the Theory of the Action. The argument that sustains the purpose is that both theories base the content analysis as method of analysis for the social actors declared speech. Initially it is accomplished a theoretical rising of authors who described the content analysis and theories and later is developed an analysis of some dissertations that made of the method in the research process in Post Graduation s Program...
Tipo: Journal Article
Palavras-chave: Social representations; Theory of the action; Content analysis; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/44035

GENERALIZED STOCHASTIC DOMINANCE: AN EMPIRICAL EXAMINATION
Provedor de dados: 31
Autores: McCarl,   Bruce A.
Use of generalized stochastic dominance (GSD) requires one to place lower and upper bounds on the risk aversion coefficient. This study showed that breakeven risk aversion coefficients found assuming the exponential utility function delineate the places where GSD preferences switch between prospects. However, between these break points, multiple, overlapping GSD intervals can be found. Consequently, when one does not have risk aversion coefficient information, discovery of breakeven coefficients instead of GSD use is recommended. The investigation also showed GSD results are insensitive to wealth and data scaling but are sensitive to rounding.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/30005

ARE INTRA-HOUSEHOLD ALLOCATIONS EFFICIENT?
Provedor de dados: 31
Autores: Aguero,   Jorge M.
This paper describes two problems when testing the efficiency of intra-household allocations. First, using Monte Carlo simulations I show that the test proposed for efficiency in consumption has a high type-II error, leading to a false acceptance of the hypothesis. Second, I show it is possible that even under asymmetric information the hypothesis of efficiency, incorrectly, cannot be rejected. Finally, I propose a test to account for asymmetric of information.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22061

Review of Generalized Estimating Equations by Hardin and Hilbe
Provedor de dados: 31
Autores: Stillman,   Steven.
This article reviews Generalized Estimating Equations by Hardin and Hilbe.
Tipo: Journal Article
Palavras-chave: Generalized estimating equations; Generalized linear models; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116078

Micro-simulation as a tool to assess policy concerning non-point source pollution: the case of ammonia in Dutch agriculture
Provedor de dados: 31
Autores: Kruseman,   Gideon; Blokland,   Pieter-Willem; Bouma,   Foppe; Luesink,   Harry H.; Mokveld,   Lennard J.; Vrolijk,   Hans C.J.
Non-point source pollution is notoriously difficult to assess. A relevant example is ammonia emissions in the Netherlands. Since the mid 1980s the Dutch government has sought to reduce emissions through a wide variety of measures, the effect of which in turn is monitored using modeling techniques. This paper presents the current generation of mineral emission models from agriculture based on micro-simulation of farms in combination with a spatial equilibrium model for the dispersion of manure from excess regions with high livestock intensities within the country to areas with low livestock intensities. The micro-simulation approach retains the richness in the heterogeneity of farm household decision making that are the core cause of the difficulty of...
Tipo: Conference Paper or Presentation
Palavras-chave: Micro-simulation; Spatial equilibrium model; Non-point source pollution; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6661

Asymmetric Response of Nutrient Intakes to Cereal Price Changes among the Poor in China: Implications for the Effect of Cereal Price Subsidies on the Poor’s Nutrient Intakes
Provedor de dados: 31
Autores: Shimokawa,   Satoru.
Previous studies commonly assume that the effects of introducing and ending cereal price subsidies on the poor’s nutrient intakes are symmetric. We question the assumption of symmetry and show that the poor’s nutrient intakes respond asymmetrically to declines and increases in the price of cereal in China. Our results imply that introducing cereal price subsidies can increase the poor’s total energy intake by increasing their calorie intakes from fat and protein, and that ending such subsidies would insignificantly affect the poor’s total energy intake; however, it may further increase their calorie intakes from fat and protein.
Tipo: Conference Paper or Presentation
Palavras-chave: Food price subsidy; Nutrition; Poverty; Asia; China; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; International Development; Research Methods/ Statistical Methods; I38; O12; Q18.
Ano: 2009
URL: http://purl.umn.edu/51661

REVISITING BID DESIGN ISSUES IN CONTINGENT VALUATION
Provedor de dados: 31
Autores: Kim,   Sooil; Haab,   Timothy C.
A uniform bid design from a predetermined uniform distribution is proposed as a practical and robust alternative to existing optimal or naïve bid designs.  Analytics and simulations show that the uniform design provides efficiency better than naïve designs under ideal conditions and outperforms optimal designs with poor initial information.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20162

FARM HOUSEHOLD INCOMES AND REFORMING THE CAP
Provedor de dados: 31
Autores: Frahan,   Bruno Henry de; Nkunzimana,   Tharcisse; De Blander,   Rembert; Gaspart,   Frederic; Sumner,   Daniel A.
Low and variable farm income has been a main rationale for heavy government intervention in agricultural markets and income transfers to farmers whether in Europe in response to disruptive agricultural imports and low world prices at the end of the 19th century or in the US in response to the Great Depression. While the future of the Common Agricultural Policy (CAP) is again discussed and new directions are examined, it is fundamental to know to what extent low and variable farm income is still a problem in contemporary European agriculture and a valid rationale for designing the new CAP. In this context, this paper first examines the income level and distribution of farm households compared to those of non-farm households for a selection of OECD...
Tipo: Conference Paper or Presentation
Palavras-chave: Farm household income; Poverty; Common Agricultural Policy; European Union; OECD.; Agricultural and Food Policy; Political Economy; Research Methods/ Statistical Methods; Q10; Q18.
Ano: 2008
URL: http://purl.umn.edu/44814

USE OF ASYMMETRIC-CYCLE AUTOREGRESSIVE MODELS TO IMPROVE FORECASTING OF AGRICULTURAL TIME SERIES VARIABLES
Provedor de dados: 31
Autores: Ramirez,   Octavio A.
Threshold autoregressive (TAR) models can accommodate the asymmetric cycling behavior observed in some time series data. This study develops a procedure to estimate TAR models when the conditional mean of the dependent variable is function of one or more exogenous factors while allowing for heteroskedasticity, i.e. for different levels of variation in upward versus downward cycles. The formulas to obtain predictions from TAR models are derived. Monte Carlo simulation analyses suggest that TAR models can significantly improve forecasting precision. Substantial gains in forecasting precision, in comparison with AR models, are in fact found when applying the proposed procedure to the modeling of U.S. quarterly soybeans future prices and Brazilian coffee spot...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21365

Bounds on Quantile Treatment Effects of Job Corps on Participants' Wages
Provedor de dados: 31
Autores: Blanco,   German; Flores,   Carlos A.; Flores-Lagunes,   Alfonso.
This paper assesses the effect of the U.S. Job Corps (JC), the nation's largest and most comprehensive job training program targeting disadvantaged youths, on wages. We employ partial identification techniques and construct informative nonparametric bounds for the causal effect of interest under weaker assumptions than those conventionally used for point identification of treatment effects in the presence of sample selection. In addition, we propose and estimate bounds on quantile treatment effects of the program on participants' wages. In general, we find convincing evidence of positive impacts of JC on participants' wages. Importantly, we find that estimated impacts on lower quantiles of the distribution are higher, with the highest impact being in the...
Tipo: Working or Discussion Paper
Palavras-chave: Job Corps; Nonparametric Bounds; Principal Stratification; Active Labor Market Programs.; Labor and Human Capital; Public Economics; Research Methods/ Statistical Methods; J24; J68; C14; C21.
Ano: 2011
URL: http://purl.umn.edu/103761

metan: fixed- and random-effects meta-analysis
Provedor de dados: 31
Autores: Harris,   Ross J.; Bradburn,   Michael J.; Deeks,   Jonathan J.; Harbord,   Roger M.; Altman,   Douglas G.; Sterne,   Jonathan A.C.
This article describes updates of the meta-analysis command metan and options that have been added since the command’s original publication (Bradburn, Deeks, and Altman, metan — an alternative meta-analysis command, Stata Technical Bulletin Reprints, vol. 8, pp. 86–100). These include version 9 graphics with flexible display options, the ability to meta-analyze precalculated effect estimates, and the ability to analyze subgroups by using the by() option. Changes to the output, saved variables, and saved results are also described.
Tipo: Article
Palavras-chave: Metan; Meta-analysis; Forest plot; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120926

THE INCOMPATIBILITY OF THE AVERAGE INVESTMENT METHOD FOR CALCULATING INTEREST COSTS WITH THE PRINCIPLE OF ALTERNATIVE OPPORTUNITIES
Provedor de dados: 31
Autores: Walrath,   Arthur J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/30412

The Impacts of Atlantic Bonito Rush and the Avian Influenza on Meat Products in Turkey
Provedor de dados: 31
Autores: Saghaian,   Sayed H.; Ozertan,   Gokhan; Spaulding,   Aslihan D.
The Atlantic bonito rush experienced in Turkey in the Fall of 2005 coincides with the avian influenza food scare that happened exactly at the same time-period in the country. In this research using time-series techniques, we investigate how the food scare and the excess fish caught jointly influence the demand for meat products in Turkey.
Tipo: Conference Paper or Presentation
Palavras-chave: Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6892

QUANTITATIVE ANALYSIS OF DATA FROM PARTICIPATORY METHODS IN PLANT BREEDING
Provedor de dados: 31
Autores: Bellon,   Mauricio R.; Reeves,   Jane.
Although participatory plant breeding (PPB) is gaining greater acceptance worldwide, the techniques needed to analyze the data from participatory methodologies in the context of plant breeding are still not well known or understood. Scientists from different disciplines and cropping backgrounds, working in international research centers and universities, discussed and exchanged methods and ideas at a workshop on the quantitative analysis of data from participatory methods in plant breeding. The papers in this volume address the three themes of the workshop: designing and analyzing joint experiments involving variety evaluation by farmers; identifying and analyzing farmers' evaluations of crop characteristics and varieties; and dealing with social...
Tipo: Book Chapter
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/23718

Demand Curve Shifts in Multi-Unit Auctions: Evidence from a Laboratory Experiment
Provedor de dados: 31
Autores: Rousu,   Matthew C.; Beach,   Robert H.; Corrigan,   Jay R.
Basic economic theory predicts that a consumer's willingness to pay for a good is affected by the presence of complements and substitutes.  In an auction setting, this theory implies that the presence of complements would increase bid prices for a good, while the presence of substitutes would decrease bid prices for a good.  However, several experimental auction studies have sold complementary or substitutable products without regard for the effects these actions could have on bidding behavior.  Using data from an experimental auction specifically designed to test the effect of complements and substitutes on bids, we used both unconditional tests and conditional tests where we derived demand flexibilities to analyze whether selling complementary and...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19513

Measuring Competition in the U.S. Airline Industry Using the Rosse-Panzar Test and Cross-Sectional Regression Analyses
Provedor de dados: 31
Autores: Fischer,   Thorsten; Kamerschen,   David R.
We employ the Rosse-Panzar test to assess market performance in selected airport-pairs originating from Atlanta. The Rosse-Panzar test stands in the tradition of the New Empirical Industrial Organization. It is based on the comparative statics of a reduced form revenue equation. Therefore, it is less powerful than structural models, but it offers the advantage of less stringent data requirements and reduces the risk of model misspecifications. The test statistic allows us in most airport-pairs to reject both conducts consistent with the Bertrand outcome, which is equivalent to perfect competition, and the collusive outcome, which is equivalent to joint profit-maximization. Rather, the test statistic suggests that behavior is consistent with a range of...
Tipo: Journal Article
Palavras-chave: Airlines; Oligopoly; Conduct; Price-cost margins; Lerner index; Rosse-Panzar test; Research Methods/ Statistical Methods; L00; L40; L93.
Ano: 2003
URL: http://purl.umn.edu/44041

Pride of the South: Risk Analysis for Marine Biosecurity in Fiordland
Provedor de dados: 31
Autores: Sinner,   Jim; Roberts,   Bethany; Piola,   Richard.
This paper describes a model used to assess alternative scenarios for managing the marine biosecurity risk to Fiordland from vessel traffic. Scenarios are assessed in terms of risk reduction per dollar spent. To keep the analysis manageable, we focus on vessel risks from hull fouling, as this is considered the primary pathway of vessel-related spread. Our analysis includes evaluation of the costs and benefits of different types of vector treatment as well as the possibility of continued vessel monitoring and control of pest populations in Bluff Harbour to reduce the risk of vector infection.
Tipo: Conference Paper or Presentation
Palavras-chave: Fiordland; Marine biosecurity; Risk reduction; Benefit cost analysis; Management options; Bluff; Agricultural and Food Policy; Environmental Economics and Policy; Food Security and Poverty; Health Economics and Policy; Land Economics/Use; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/97162

Lessons Learned from 25 Years of Food Security Research, Capacity-Building, and Outreach.
Provedor de dados: 31
Autores: Food Security Group at Michigan State University.
Decades of research have led to substantially improved understanding of the nature of food insecurity. Until the food crisis of 2007/08, a combination of economic growth and targeted programs resulted in a steady fall in the percentage of the world’s population suffering from under-nutrition (from 20% in 1990/92 to 16% in 2006). Yet over a billion people still face both chronic and/or transitory food insecurity due to long-standing problems of inadequate income, low-productivity in agricultural production and marketing, and related problems of poor health and absence of clean water. Among regions of the world, the greatest number of the food insecure lives in South Asia, while Sub-Saharan Africa (SSA) has the highest proportion of population that is food...
Tipo: Working or Discussion Paper
Palavras-chave: Africa; Food Security; Research; Capacity building; Outreach; Agricultural and Food Policy; Community/Rural/Urban Development; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; International Development; Research Methods/ Statistical Methods; Q10; Q18; Q12; Q13.
Ano: 2009
URL: http://purl.umn.edu/55047

APPLICATIONS OF DUALITY THEORY TO AGRICULTURE
Provedor de dados: 31
Autores: Lopez,   Ramon E.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32280

Two postestimation commands for assessing confounding effects in epidemiological studies
Provedor de dados: 31
Autores: Wang,   Zhiqiang.
Confounding is a major issue in observational epidemiological studies. This paper describes two postestimation commands for assessing confounding effects. One command (confall) displays and plots all possible effect estimates against one of p-value, Akaike information criterion, or Bayesian information criterion. This computing-intensive procedure allows researchers to inspect the variability of the effect estimates from various possible models. Another command (chest) uses a stepwise approach to identify variables that have substantially changed the effect estimate. Both commands can be used after most common estimation commands in epidemiological studies, such as logistic regression, conditional logistic regression, Poisson regression, linear regression,...
Tipo: Article
Palavras-chave: Confall; Confgr; Chest; Epidemiological methods; Confounding; All possible effects; Change in estimate; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119267

Innovation Trajectories in Honduras’ Coffee Value Chain? ‐ Public and the Private Influence on the Use of new Knowledge and Technology among Coffee Growers ‐
Provedor de dados: 31
Autores: Fromm,   Ingrid; Hartwich,   Frank; Romero,   Gustavo.
In this paper we present results from a study on the use of improved coffee production technology schemes among smallholder coffee producers in three prominent coffee producing regions in Honduras. We analyze the impact of various schemes (trajectories) in which different agents influence the producers’ decision to use new technologies. In particular, we distinguish the influence of a) private coffee buying organizations and b) government and public development agencies on the innovation behavior of coffee growers. Drawing from network data that depict the internal and outbound connectedness of producers in three village communities in main coffee producing zones in Honduras, we applied tools of social network analysis to find out how interactions with...
Tipo: Conference Paper or Presentation
Palavras-chave: Coffee production; Innovation; Upgrading; Social networks; Honduras; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100475

Comprehensive Evaluation of Circular Economic Development in North Anhui Province
Provedor de dados: 31
Autores: Hu,   Shuheng; Zhang,   Simei; Chen,   Guangzhou; Xu,   Min.
In view of the characteristics of north Anhui Province, an index system was constructed for evaluating the development level of circular economy according to relevant principles, Principal Component Analysis and Analytic Hierarchy Process were adopted to evaluate the circular economic development in north Anhui Province, and corresponding measures were put forward to promote the circular economy in north Anhui Province.
Tipo: Thesis or Dissertation
Palavras-chave: Circular economy; Evaluation system; Principal Component Analysis (PCA); Analytic Hierarchy Process (AHP); North Anhui Province; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/54034

U.S. Honey Supply Chain: Structural Change, Promotions and the China Connection
Provedor de dados: 31
Autores: Ward,   Ronald W.; Boynton,   Bruce.
Honey is a by‐product of the pollination of plants and essential to almost all agricultural plant product. Demand for honey provides a partial compensation for the pollination services. Hence, programs to support honey demand such as promotions are potentially very important to the agricultural sector as well as the honey industry. Honey is utilized for table consumption and for manufacturing and both U.S. domestic and foreign honey imports both contribute to the U.S. honey availability. Econometric models are estimated showing the domestic table‐use and manufacturing demand with the models explicitly incorporating the effects of generic promotion of honey. Rates-of‐ return to the U.S. honey promotion programs are estimated with rates assigned to domestic...
Tipo: Journal Article
Palavras-chave: Honey; Demand; Imports; Generic promotions; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/91137

DUALITY, OPTIMIZATION, AND MICROECONOMIC THEORY:  PITFALLS FOR THE APPLIED RESEARCHER
Provedor de dados: 31
Autores: Taylor,   C. Robert.
This article graphically illustrates the one-to-one duality mapping among the production function, the product supply equation, the derived factor demand equation, and the indirect profit function for the classical profit maximization problem.  This pedagogical framework is then used to illustrate how empirical application of conventional duality theory can lead to distorted empirical results if the theory (e.g. Hotelling’s lemma) does not apply because the firm is not a profit maximizer or because envelope results from the wrong optimization model are used.  Although the presentation is in terms of profit maximization, the basic concepts can be extended to other maintained behavioral hypotheses such as cost minimization or utility maximization.  Plausible...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/32355

U.S. Public Agricultural Research:  Changes in Funding Sources and Shifts in Emphasis, 1980-2005
Provedor de dados: 31
Autores: Schimmelpfennig,   David E.; Heisey,   Paul W.
Over the years, proposals have recommended shifting the focus of public agricultural research from applied to basic research, and giving higher priority to peer-reviewed, competitively funded grants. The public agricultural research system in the United States is a Federal-State partnership, with most research conducted at State institutions. In recent years, State funds have declined, USDA funds have remained fairly steady (with changes in the composition of funding), but funding from other Federal agencies and the private sector has increased. Efforts to increase competitively awarded funds for research have fluctuated over time, as have special grants (earmarks). Along with shifts in funding sources, the proportion of basic research being undertaken...
Tipo: Report
Palavras-chave: Agricultural research; Current Research Information System; CRIS; State Agricultural Experiment Stations (SAES); Competitive and formula funds; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/58314

The didactic value of linking models: experiences from the LEI model funnel
Provedor de dados: 31
Autores: Helming,   John F.M.; Banse,   Martin.
The complexity of agri-environmental economic issues is such that a model that is fully consistent at all levels of aggregation and all type of questions to be addressed is not available at the Agricultural Economics Research Institute in the Hague LEI. Such a model is probably also not feasible. At LEI this problem is solved by linking models at different scales of analysis: global economic, national economy-wide, regional agricultural, national spatial and farm levels. This linked model system enlarges scope and consistency of the analysis. The goal of the model linking, however, is not a full integration and, ultimately, simultaneous optimization of the models. Therefore, the different models of the LEI model funnel are often rather loosely linked....
Tipo: Journal Article
Palavras-chave: Economic models; Combined models; Quantitative policy analysis; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/97708

THE DELETION OF VARIABLES FROM REGRESSION MODELS BASED ON TESTS OF SIGNIFICANCE: A STATISTICAL AND MORAL ISSUE
Provedor de dados: 31
Autores: Debertin,   David L.; Freund,   R.J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/29666

Where There's Smoke There's Fire - An Apology and a Statement
Provedor de dados: 31
Autores: Mules,   T.J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/12436

A LATENT VARIABLE MIMIC APPROACH TO INFERRING THE QUALITY OF LIFE
Provedor de dados: 31
Autores: Rahman,   Tauhidur; Mittelhammer,   Ronald C.; Wandschneider,   Philip R.
This paper makes three principal contributions. First, we propose a new estimator for the unobservable variable models with endogenous causes. We show that under factor analysis type of assumptions, Robinson and Ferrara (1977)'’s procedure is not fully efficient, and a more efficient procedure can be obtained by merging Robinson and Ferrara'’ procedure with that in Joreskog and Goldberger (1975) procedure. The asymptotic properties of the new estimator are compared with these two estimators and results indicate that, with our mixture approach, significant efficiency gains can be achieved. Second, we model the Quality of life (QOL) as an unobservable or latent link variable between observable causes and observable effects, which mitigates problem of bias,...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20351

Building producer loyalty in Malaysia's fresh milk supply chain
Provedor de dados: 31
Autores: Boniface,   Bonaventure; Gyau,   Amos; Stringer,   Randy; Umberger,   Wendy J.
The paper presents results from a survey of 133 dairy producers in Malaysia, and identifies how Malaysian milk buyers can build a loyal customer base with their suppliers as a means to secure uninterrupted milk supplies. A structural equation model was conducted to test the conceptual model using AMOS 17.0 software. The results show that whereas timely and collaborative communication, price satisfaction and cultural fit influence positively suppliers’ contractual and competence trust in their buyers, power dependency negatively influences competence trust. Furthermore, suppliers’ trust in their buyers will eventually lead to loyalty. The principal implication is that milk processors and other buyers need to engage in collaborative communication with the...
Tipo: Journal Article
Palavras-chave: Dairy; Malaysia; Customer base; Competence trust; Suppliers trust; Collaborative communication; Agribusiness; Agricultural and Food Policy; Farm Management; Industrial Organization; Institutional and Behavioral Economics; Marketing; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2010
URL: http://purl.umn.edu/114423

Developments in Agricultural Economic Data
Provedor de dados: 31
Autores: Upchurch,   M.L.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/95727

Imposing Curvature Conditions on Flexible Functional Forms to GNP Functions
Provedor de dados: 31
Autores: Chapda Nana,   Guy; Larue,   Bruno.
This paper empirically investigates the implications of the imposition of convexity in output prices and concavity in factor endowments on flexible functional forms for the GNP function. Using macroeconomic data for Switzerland, we estimate the Translog and the Symmetric Normalized Quadratic forms to investigate the manner with which curvature restrictions are imposed, the extend of curvature violations and the robustness of estimated elasticities. We also compare the predictive accuracy of the aforementioned flexible functional forms. Our result show that concavity in factor endowments is violated much more often than convexity in output prices. For the Translog, the date at which local restrictions are imposed matters a great deal in terms of remaining...
Tipo: Working Paper
Palavras-chave: GNP function; Flexible functional forms; Curvature violations; Elasticities; International Relations/Trade; Research Methods/ Statistical Methods; D24; C30.
Ano: 2012
URL: http://purl.umn.edu/123308

Ask a Hypothetical Question, Get a Valuable Answer?
Provedor de dados: 31
Autores: Azevedo,   Christopher D.; Herriges,   Joseph A.; Kling,   Catherine L.
This paper models the recreation demand for Iowa wetlands, combining survey data on both actual usage patterns (i.e., revealed preferences) and anticipated changes to those patterns under hypothetical increases in trip costs (i.e., stated preferences). We formulate and test specific hypotheses concerning potential sources of bias in each data type. We consistently reject consistency between the two data sources, both in terms of implied wetland values and underlying preference parameters. Careful attention is paid to the interpretations of the test results, noting particularly how the interpretation of the same results can vary with the "school of thought" of the reader.
Tipo: Working or Discussion Paper
Palavras-chave: Revealed preference; Stated preference; Recreation; Wetlands; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/18418

A Semi-Parametric Analysis of Technology, with an Application to U.S. Dairy Farms
Provedor de dados: 31
Autores: de los Campos,   Gustavos; Foltz,   Jeremy D.; Chavas,   Jean-Paul; Gianola,   Daniel.
This article proposes a semi-parametric stochastic frontier model (SPSF) in which components of the technology and of technical efficiency are represented using semi-parametric methods and estimated in a Bayesian framework. The approach is illustrated in an application to US farm data. The analysis shows important scale economies for small and medium herds and constant return to scale for larger herds. With the exception of labor, estimates of marginal products were close to the value expected under profit maximization. Finally, the results suggest important opportunities to increase productivity through reductions in technical inefficiencies.
Tipo: Working or Discussion Paper
Palavras-chave: Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/92251

The Effect of Prior Gains and Losses on Current Risk-Taking Using Quantile Regression
Provedor de dados: 31
Autores: Mattos,   Fabio; Garcia,   Philip.
This paper investigates the dynamics of sequential decision-making in agricultural futures and options markets using a quantile regression framework. Analysis of trading records of 12 traders suggests that there is great heterogeneity in individual trading behavior. Traders respond differently to prior profits depending on how much risk their portfolios are carrying. In general, no significant response is found at average and below-average levels of risk, but response can become large and significant at above-average levels of risk. These results are consistent with studies which argued that behavior may be uneven under different circumstances, and calls into question the adoption of conditional mean framework to investigate trading behavior. Focusing the...
Tipo: Conference Paper or Presentation
Palavras-chave: Loss aversion; House-money effect; Quantile regression; Futures; Options; Agribusiness; Agricultural Finance; Consumer/Household Economics; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53035

Are Corn Trend Yields Increasing at a Faster Rate?
Provedor de dados: 31
Autores: Tannura,   Michael A.; Irwin,   Scott H.; Good,   Darrel L.
Tipo: Report
Palavras-chave: Agricultural Finance; Demand and Price Analysis; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/37500

A COMPARISON OF OBJECTIVE FUNCTION STRUCTURES USED IN A RECURSIVE GOAL PROGRAMMING-SIMULATIONS MODEL OF FARM GROWTH
Provedor de dados: 31
Autores: Dobbins,   Craig L.; Mapp,   Harry P., Jr.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/30451

STATIONARY-STATE SOLUTIONS IN MULTI-PERIOD LINEAR PROGRAMMING PROBLEMS
Provedor de dados: 31
Autores: Throsby,   C.D.
Multi-period linear programming models are classified initially. The main interest of this paper is in models of cyclical activity. The conditions under which such models lead to stable repetitive optimal solutions are defined. A simple technique is presented by which this stable solution (termed here the "stable core") can be derived without recourse to solving a full extended matrix. Firm-level applications of this model in agriculture are discussed.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1967
URL: http://purl.umn.edu/22752

Regional Income Inequality and Economic Growth: A Spatial Econometrics Analysis for Provinces in the Philippines
Provedor de dados: 31
Autores: Pede,   Valerien O.; Sparks,   Adam H.; McKinley,   Justin D.
This paper revisits the inequality-growth relationship using data at the sub-national (provincial) level in the Philippines over the period 1991- 2000. A conditional convergence growth model is considered where the growth of per capita income depends on inequality and other growth factors. The contribution of each province to the overall inequality obtained from the Theil index is considered. Results indicate that inequality has a positive and significant effect on per capita income growth. However, the magnitude of the inequality effect is not stable across regions. Geographically Weighted Regression estimates show that the magnitude of the inequality growth relationship varies over a range of 0.72 to 3.36. Other results are also noteworthy in this study....
Tipo: Presentation
Palavras-chave: Clusters; Growth; Inequality; Spatial econometrics; Community/Rural/Urban Development; Research Methods/ Statistical Methods; R11; R12; O15; C21.
Ano: 2012
URL: http://purl.umn.edu/124402

Research Areas: Validation Study Tests Accuracy of Homescan Data
Provedor de dados: 31
Autores: Leibtag,   Ephraim S.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/124189

Web-based surveys and sample frame bias in choice experiment
Provedor de dados: 31
Autores: Tait,   Peter R.; Bicknell,   Kathryn; Cullen,   Ross.
Researchers are seeking effective, low cost means of gathering high quality data. Technological advancements offer new avenues for achieving this objective.  Web based surveys are relatively common outside the economics discipline however  applied non-market valuation practitioners have been slow to adopt this modernisation in survey methodology. The non-random exclusion of individuals from the sample frame is often cited as a major problem with web-based surveying.  This paper presents a comparison of data from two choice experiment survey modes, traditional mail-and-return and web-based. The socio-demographic composition of the samples is significantly different for half the variables considered. Poe tests reveal that there are significant differences in...
Tipo: Conference Paper or Presentation
Palavras-chave: Web-based surveys; Sample frame bias; Choice experiment; Environmental Economics and Policy; Research Methods/ Statistical Methods; C83; Q51.
Ano: 2009
URL: http://purl.umn.edu/109594

An assessment of five different theoretical frameworks to study the uptake of innovations
Provedor de dados: 31
Autores: Botha,   Neels; Atkins,   Kris.
There are several theoretical frameworks one can draw upon to study the adoption process. Extension Theory, Bounded Rationality, Diffusion Theory, the Theory of Reasoned Action and Consumer Behaviour Theory were of particular interest to us. In assessing the frameworks we looked for contradictions, and how and whether these frameworks could be used to study the adoption process. The assessment was done by using our own conceptual framework of the adoption process and we discuss the results in this paper. We found that the different frameworks don‘t contradict each other and when combined into our conceptual framework they offer very useful constructs for studying the adoption process.
Tipo: Conference Paper or Presentation
Palavras-chave: Adoption; Innovations; Theory; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005
URL: http://purl.umn.edu/98497

A BEGINNER'S GUIDE TO VECTOR AUTOREGRESSION
Provedor de dados: 31
Autores: Ford,   Stephen A.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/13527

MICROCOMPUTER ACCURACY IN SOLVING LINEAR PROGRAMMING PROBLEMS WITH REDUNDANT CONSTRAINTS
Provedor de dados: 31
Autores: Soler,   Alvaro; Fuller,   Earl I.
This study reports on how different microcomputer systems performed in the solution of two linear programming models purposely specified with redundant vectors.  Comparisons were made to a Cyber 720 that used both a Fortran and Basic version of the same primal-dual algorithm.  Results are mixed.  But Microsoft Basic with double precision under CP/M on a Z80A processor performed at least equally well to the Cyber 720 provided that an appropriate essential zero value was specified.  Different coefficient scaling schemes were also tested.  The results should be of interest to all users of matrix inversion schemes on microcomputers.  Extensions of the study to new hardware and software systems are encouraged.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986
URL: http://purl.umn.edu/13722

INFORMATION THEORETIC ALTERNATIVES TO TRADITIONAL SIMULTANEOUS EQUATIONS ESTIMATORS IN THE PRESENCE OF HETEROSKEDASTICITY
Provedor de dados: 31
Autores: Marsh,   Thomas L.; Mittelhammer,   Ronald C.
Finite sampling properties of information theoretic estimators of the simultaneous equations model, including maximum empirical likelihood, maximum empirical exponential likelihood, and maximum log Euclidean likelihood, are examined in the presence of selected forms of heteroskedasticity.  Extensive Monte Carlo experiments are used to compare finite sample performance of Wald, Likelihood ratio, and Lagrangian multiplier tests constructed from information theoretic estimators to those from traditional generalized method of moments.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19831

GROWTH OF GERMAN DAIRY FARMS UNDER THE EU MILK QUOTA
Provedor de dados: 31
Autores: Breustedt,   Gunnar; Mees,   Martin.
B3_3
Tipo: Conference Paper or Presentation
Palavras-chave: Farm growth; Gibrat's Law; Milk quota; Selection bias; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93950

A NOTE ON THE EXISTENCE OF STARTING POINT BIAS IN ITERATIVE BIDDING GAMES
Provedor de dados: 31
Autores: Samples,   Karl C.
This note further illuminates the strength and direction of starting point bias in iterative bidding procedures.  Conflicting recent findings concerning the starting point bias phenomenon are first briefly overviewed.  The hypothesis that starting values influence valuations obtained in iterative bidding games is then tested in an experimental setting using widely disparate starting values ranging from $1 to $8,000.  Statistically significant differences in mean final bidding outcomes were consistently detected in games using different starting values.  This evidence, combined with test results reported elsewhere, strongly suggests that starting point value selection can have subtle but significant effects on observed final bids.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/32510

Planning Research to Assess Social Performance: Guidance For Managers
Provedor de dados: 31
In order to know whether they are achieving their social goals and how to manage for social performance microfinance institutions (MFIs) need to find out: 1) Who uses the programme's products and services?  Who does the programme exclude?  2) Why and when do clients leave the programme or fail to fully utilise the available services? 3) What is the effect of the programme's products and services on current clients?  MFIs can answer these questions.  Some may have the in-house skills; others may choose to develop the skills and capacity to do so.  Work with 30 Imp-Act partners has demonstrated that this is possible.
Tipo: Report
Palavras-chave: Financial Economics; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/23742

The impact of property rates on agricultural land, focusing on Mpumalanga
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005.  This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58207

Size Monotonicity and Stability of the Core in Hedonic Games
Provedor de dados: 31
Autores: Dimitrov,   Dinko; Chin Sung,   Shao.
We show that the core of each strongly size monotonic hedonic game is not empty and is externally stable. This is in sharp contrast to other sufficient conditions for core non-emptiness which do not even guarantee the existence of a stable set in such games.
Tipo: Working or Discussion Paper
Palavras-chave: Core; Hedonic Games; Monotonicity; Stable Sets; Research Methods/ Statistical Methods; C71.
Ano: 2011
URL: http://purl.umn.edu/115722

Determinants of Crop Income in Rural Mozambique, 2002-2005.
Provedor de dados: 31
Autores: Mather,   David.
Crop income is the predominant source of income for most rural Mozambican households, accounting for 73% of rural household income on average in 2002, and greater than 80% of the total income of the poorest 40% of rural households. While the Government of Mozambique recognizes the need to improve agricultural productivity, there is little empirical evidence to date suggesting what mix of public and private assets would best foster improved agricultural productivity in rural Mozambique. This paper aims to better understand the determinants of household crop income in rural Mozambique, by using the TIA panel household survey of 2002-2005 to measure the impact of various private and public assets on crop income. We build upon Walker et al.’s (2004) analysis...
Tipo: Working Paper
Palavras-chave: Mozambique; Crop income; Food security; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Food Security and Poverty; International Development; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/121861

The Dynamics of the U.S. Milk Supply: Implications for Changes in U.S. Dairy Policy
Provedor de dados: 31
Autores: Bozic,   Marin; Gould,   Brian W.
There is continuing pressure by various farm groups to attempt to solve the chronic problems in the U.S. dairy industry represented by increased milk price variability, inability to generate positive returns at the farm level, increasing role of dairy exports as an important market for U.S. dairy products, etc. As such it is important for analysts and policy makers obtain an estimate as to how responsive dairy producers are to changing economic and technological conditions. Examples of previous research used to examine supply response in the U.S. dairy sector include LaFrance and deGorter (1985), Chavas and Klemme (1986), Thraen and Hammond (1987), Chavas, Krauss and Jesse (1990), Chavas and Krauss (1990), Yavuz, et al, (1996) and USDA (2007). These...
Tipo: Working or Discussion Paper
Palavras-chave: Milk supply; Long-run elasticities; Dairy policy; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Livestock Production/Industries; Production Economics; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Q11.
Ano: 2009
URL: http://purl.umn.edu/53818

Climate change and Hunger: Responding to the Challenge
Provedor de dados: 31
Autores: Parry,   Martin; Evans,   Alex; Rosegrant,   Mark W.; Wheeler,   Tim.
Published by the World Food Programme, the International Food Policy Research Institute, the New York University Center on International Cooperation, the Grantham Institute at Imperial College London, and the Walker Institute, University of Reading (United Kingdom).
Tipo: Report
Palavras-chave: Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/56193

Simple Computational Methods for Measuring the Difference of Empirical Distributions:  Application to Internal and External Scope Tests in Contingent Valuation
Provedor de dados: 31
Autores: Poe,   Gregory L.; Giraud,   Kelly L.; Loomis,   John B.
This paper develops a statistically unbiased and simple method for measuring the difference of independent empirical distributions estimated by bootstrapping or other simulation approaches.  This complete combinatorial method is compared with other unbiased and biased methods that have been suggested in the literature, first in Monte Carlo simulations and then in a field test of external and internal scope testing in contingent valuation.  Tradeoffs between methods are discussed.  When the empirical distributions are not independent a straightforward difference test is suggested.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19664

Examining Students’ Perceptions of Globalization and Study Abroad Programs at HBCUs
Provedor de dados: 31
Autores: Walker,   Stevon; Bukenya,   James O.; Thomas,   Terrence.
The objective in this paper is to explore students’ perceptions of globalization and study abroad programs at Historically Black Colleges and Universities (HBCUs). Recent statistics reveal that in spite of the current growth in the number of US students receiving academic credit for their overseas academic experience, less than one percent of undergraduate minority students participate in a study abroad program during their degree program. The analysis is based on survey questionnaires administered to 263 undergraduate minority students at Alabama A&amp;M University. The questionnaire contained questions related to respondents’ demographic characteristics and likert-scale questions pertaining to students’ perceptions of globalization and studying abroad...
Tipo: Conference Paper or Presentation
Palavras-chave: Globalization; Study Abroad Programs; Logistic Regression; Factor Analysis; Survey Data; Agribusiness; Agricultural and Food Policy; International Development; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/56481

Confidence intervals for the kappa statistic
Provedor de dados: 31
Autores: Reichenheim,   Michael E.
The command kapci calculates 100(1 - α)% confidence intervals for the kappa statistic using an analytical method in the case of dichotomous variables or bootstrap for more complex situations. For instance, kapci allows estimating CI for polychotomous variables using weighted kappa or for cases in which there are more than 2 raters/replications.
Tipo: Journal Article
Palavras-chave: Kapci; Reliability; Kappa statistic; Confidence intervals; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116269

RISK ANALYSIS OF CROPPING SYSTEMS USING EXPERIMENTAL CROPPING SYSTEM-FERTILIZER DATA
Provedor de dados: 31
Autores: Helmers,   Glenn A.; Dias,   Weeratilake; Langemeier,   Michael R.; Atwood,   Joseph A.
Using 11 years of experimental crop yields by cropping systems and fertilizer level, a MOTAD frontier was developed.  This analysis allowed yield, cost, and stability interactions arising from crop sequences to be implicitly included.  Target-MOTAD, Safety-First, and undominated stochastic efficient systems were also compared.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1998
URL: http://purl.umn.edu/20967

Effects of a flat rate introduction: shifts in farm activity and impact on farmers' income
Provedor de dados: 31
Autores: Marchand,   Fleur L.; Buysse,   Jeroen; Campens,   V.; Claeys,   Dakerlia; Fernagut,   Bruno; Lauwers,   Ludwig H.; Van der Straeten,   Bart; Van Huylenbroeck,   Guido.
Current thoughts on CAP changes, e.g. the "Health Check", emphasize the necessity to move away from payments based on historical receipts towards a "flatter rate" system. The aim of current research is to simulate the impact of a flat rate system (equal payments per hectare of cultivated land) compared to the current historical system (payments based on individual historic entitlements). Impact on production and income of arable, dairy and cattle farms of two different flat rate scenario's, is assessed with a farm-based sector model for Flanders. The model maximizes income at farm level, calibrated to observed farming behavior in 2001-2003. Farm data can be selected by farm type, size and region, simulations could be run for specific sub sectors, size...
Tipo: Conference Paper or Presentation
Palavras-chave: Positive Mathematical Programming; Farm model; Common Agricultural Policy; Payment Entitlements.; Agricultural and Food Policy; Agricultural Finance; Farm Management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6681

MIXTURE DISTRIBUTIONS: CURING COMMODITY KURTOSIS?
Provedor de dados: 31
Autores: Roberts,   Matthew C.
Recent research has determined that commodity prices often exhibit distributional characteristics inconsistent with normality or log-normality.  We utilize discrete mixtures of log-normals in a GARCH framework to model corn, wheat, and soybean prices.  Options premiums are simulated and compared to actual premiums and premiums generated under standard Black-Scholes assumptions.
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21604

The Multifunctional Attributes of Northeastern Agriculture: A Research Agenda
Provedor de dados: 31
Autores: Batie,   Sandra S.
In the United States' Northeastern region, there is an increasing interest in the public benefits from agriculture. These benefits are frequently referred to as multifunctional attributes. The policy challenge is to find an effective way to reflect these public demands so that multifunctional agriculture can be profitable. There is a significant research agenda that accompanies this challenge. Research topics include assessing and understanding consumer demand for multifunctional attributes, estimating the long-run returns to those production systems which supply these attributes, and designing and evaluating institutional arrangements to supply them.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/31342

STATIC MODELING OF DYNAMIC RECREATION BEHAVIOR: IMPLICATIONS FOR PREDICTION AND WELFARE ESTIMATION
Provedor de dados: 31
Autores: Baerenklau,   Kenneth A.; Provencher,   Bill.
This paper examines the consequences of using a static model of recreation trip-taking behavior when the underlying decision problem is dynamic. In particular, we examine the implications for trip forecasting and welfare estimation using a panel dataset of Lake Michigan salmon anglers for the 1996 and 1997 fishing seasons. We derive and estimate both a structural dynamic model using Bellman's equation, and a reduced-form static model with trip probability expressions closely mimicking those of the dynamic model. We illustrate an inherent identification problem in the reduced-form model that creates biased welfare estimates, and we discuss the general implications of this for the interpretation of preference parameters in static models. We then use both...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20355

TOTAL QUALITY MANAGEMENT IN THE FOOD INDUSTRY – CURRENT SITUATION AND POTENTIAL IN GERMANY
Provedor de dados: 31
Autores: Morath,   Clemens; Doluschitz,   Reiner.
The requirements in terms of information availability, risk precaution and control in the food industry continue to increase. In this context the interest of companies in the Total Quality Management (TQM) approach is also increasing. This development attracts notice to Business Excellence and connected systems. Similarly, various quality management tools and techniques are available. In this regard a research project analyzed to what extent the companies in the food industry apply different activities of the TQM scheme. The research calculates the importance that the companies attach to different requirements of TQM and how they implement them. Additionally, statistical analysis provides evidence that there is a positive correlation between the...
Tipo: Journal Article
Palavras-chave: Food Industry; Total Quality Management; Ordinal Logistic Regression; Business Excellence; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53549

Fuzzy Quantitative Measure on Brand Extension of Agricultural Products
Provedor de dados: 31
Autores: Chen,   Youxing; Xu,   Hui.
Based on the apprehension of the connotation of brand extension, we select five factors to evaluate the brand extension of agricultural products, including the consumers’ attitude towards original brand of agricultural products, relevance between original products and extensive products, association of agricultural brands, difficulties in making the extensive agricultural products, and cultural compatibility of original brand. We also establish the index system of influencing factors for brand extension of agricultural products, and adopt multi-level measure model to empirically analyze the brands A and B. Result shows that the comprehensive measure values of brands A and B are 77.35 and 78.25, respectively, indicating the extension effect evaluation of...
Tipo: Thesis or Dissertation
Palavras-chave: Agricultural products; Brand extension; Fuzzy comprehensive evaluation method; China; Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53808

PARAMETER ESTIMATION FOR A COMPUTABLE GENERAL EQUILIBRIUM MODEL:  A MAXIMUM ENTROPY APPROACH
Provedor de dados: 31
Autores: Arndt,   Channing; Robinson,   Sherman; Tarp,   Finn.
We introduce a maximum entropy approach to parameter estimation for computable general equilibrium (CGE) models. The approach applies information theory to estimating a system of nonlinear simultaneous equations. It has a number of advantages. First, it imposes all general equilibrium constraints. Second, it permits incorporation of prior information on parameter values. Third, it can be applied in the absence of copious data. Finally, it supplies measures of the capacity of the model to reproduce the historical record and the statistical significance of parameter estimates. The method is applied to estimating a CGE model of Mozambique.
Tipo: Working or Discussion Paper
Palavras-chave: Maximum entropy; Computable general equilibrium; CGE; Prior information; Mozambique.; Research Methods/ Statistical Methods; C51; C68.
Ano: 2001
URL: http://purl.umn.edu/42456

THE LINEAR REGRESSION MODEL WITH AUTOCORRELATED ERRORS: JUST SAY NO TO ERROR AUTOCORRELATION
Provedor de dados: 31
Autores: McGuirk,   Anya M.; Spanos,   Aris.
This paper focuses on the practice of serial correlation correcting of the Linear Regression Model (LRM) by modeling the error. Simple Monte Carlo experiments are used to demonstrate the following points regarding this practice. First, the common factor restrictions implicitly imposed on the temporal structure of yt and xt appear to be completely unreasonable for any real world application. Second, when one compares the Autocorrelation-Corrected LRM (ACLRM) model estimates with estimates from the (unrestricted) Dynamic Linear Regression Model (DLRM) encompassing the ACLRM there is no significant gain in efficiency! Third, as expected, when the common factor restrictions do not hold the LRM model gives poor estimates of the true parameters and estimation of...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/19905

A System Dynamics approach for the investigation of peripheral and agrarian communities
Provedor de dados: 31
Autores: Kopainsky,   Birgit; Rieder,   Peter; Buchli,   Simon.
In this paper an alternative approach for the analysis of rural development in peripheral and agrarian communities in the Swiss Alps is developed. It is based on System Dynamics, a qualitative and quantitative methodology on the structure and behaviour of complex systems. In the qualitative part, system elements and their interconnections are identified and a descriptive networktype model of the strategically relevant issues faced by peripheral and agrarian communities is developed. In the quantitative part, a dynamic simulation model is built as a decision support tool for the evaluation of different policy measures. Preliminary results from the application of the methodology to the Muenstertal confirm the need for this holistic view of the processes...
Tipo: Journal Article
Palavras-chave: Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/32001

Stated Preference Evaluation of Government Budgets
Provedor de dados: 31
Autores: Kerr,   Geoffrey N.; Cullen,   Ross; Hughey,   Kenneth F.D.
Stated preference approaches are widely used in non-market valuation. However, their potential uses extend far beyond valuation. In particular they can be used to assess efficiency of resource allocations and to design optimal resource allocations. Changes to the government budget were evaluated using a choice experiment. Results indicate potential efficiency gains from reallocation of the budget to items with higher marginal utility. In particular, New Zealand residents want more spending on health, education and the environment, with health spending consistently having the highest marginal benefits. People want less government money spent on income support. The choice experiment was able to identify the impacts of demographic factors. Young people rated...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice experiment; Public preferences; Government budget; Community/Rural/Urban Development; Consumer/Household Economics; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Political Economy; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/98520

Mata Matters: Subscripting
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. In the Mata Matters column, we show how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. Subscripting is the subject of this column. Stata has three subscripting modes, and two of them are about more than accessing an element of a vector or matrix. The advanced forms of subscripting can, by themselves, be the solution to some problems.
Tipo: Article
Palavras-chave: Mata; Subscripts; List subscripts; Range subscripts; Sampling with replacement; Permutation matrices and vectors; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119258

The Elicitation of Subjective Probabilities with Applications in Agricultural Economics
Provedor de dados: 31
Autores: Norris,   Patricia E.; Kramer,   Randall A.
Probability judgements are important components of decision making under uncertainty. In particular, economic decisions can be aided by assuring more accurate assessment of probabilities and more realistic modelling of economic problems through the inclusion of subjective probabilities. The purpose of this paper is to describe the techniques which can be used to elicit subjective probabilities and the ways in which these techniques can be incorporated into agricultural economics research. The review draws from the statistics, psychology, management, operations research, meteorology and economics literature.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/12253

A COMPARATIVE ANALYSIS OF AGRICULTURAL TRACTOR INVESTMENT MODELS
Provedor de dados: 31
Autores: Vanzetti,   David; Quiggin,   John C.
An implicit rental price approach is used to analyse the determinants of farm tractor investment at the aggregate level. Three models, based on different assumed factor substitutabilities, are compared. Variations in the rental price of tractors appear to have less effect on demand than variations in factors affecting the profitability of the cropping enterprise as a whole. The implications for forecasting and for policy instruments, such as the investment allowance, are discussed.
Tipo: Journal Article
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/22521

THE ACCURACY OF REGRESSION PROGRAMS: UNIVERSITY OF MINNESOTA
Provedor de dados: 31
Autores: Bredahl,   Maury E.; Mylander,   Ann.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/13757

Stata tip 21: The arrows of outrageous fortune
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117521

INTEREST AND IDENTITY IN NETWORK FORMATION
Provedor de dados: 31
Autores: Santos,   Paulo; Barrett,   Christopher B.
In this paper, we use an unusually rich data set from Ghana to explore the endogenous formation of information network linkages among farmers. We propose and test a new measure of social distance that accommodates possible asymmetries in social distance. Using this improved measure, we show that social distance plays a major role in shaping network structure, but that other factors related to the inherent costs and benefits of linkage matter significantly as well. Network interlinkages appear relatively modest.  We are also able to corroborate the sociological "“strength of weak ties”" hypothesis.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19920

Feasible Estimation of Firm-Specific Allocative Inefficiency through Bayesian Numerical Methods
Provedor de dados: 31
Autores: Atkinson,   Scott E.; Dorfman,   Jeffrey H.
The estimation of allocative and technical inefficiency has grown to an enormous body of literature, both theoretical and empirical. Ideally, one would estimate time-varying firm and input-specific parameters describing allocative inefficiency in order to minimize aggregation bias. However, this has never been previously accomplished. Typically, only industry-wide allocative efficiency parameters have been empirically identified. Our proposed solution is to employ Gibbs sampling to approximate posterior distributions from a Bayesian limited information model, embedding GMM moment conditions imposed via an instrumental variables step to obtain plant-specific parameters estimates that vary flexibly over time. For a panel of Chilean hydroelectric power...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19402

APPLICATIONS OF GAME THEORY IN AGRICULTURAL ECONOMICS: REVIEW AND REQUIEM
Provedor de dados: 31
Autores: Dillon,   John L.
Game theory - aptly described as the scientific approach to poker, business, women and war - has proved to be no cure-all for the conflict situations studied by agricultural economists. Like Marshall, it has had its day. Still, just as in general economics, game theory has provided an alternative framework for the study of a variety of agricultural problems. This paper aims to review these studies. As background, a brief resume of the more important economic theories of decision making in risky situations will first be given, followed by an outline of the pertinent aspects of game theory. Agricultural applications are then considered. A general appraisal - pro and con, past and future - completes the review.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1962
URL: http://purl.umn.edu/22459

Scale and scope effects on communities’ values for environmental improvements in the Namoi catchment: A choice modelling approach
Provedor de dados: 31
Autores: Mazur,   Kasia; Bennett,   Jeffrey W.
This report presents results of research designed to investigate variations in willingness to pay (WTP) estimates across different scales and scopes of environmental investments. The goal is to help catchment management authorities better prioritise their natural resource management actions at both catchment and farm levels.   Five split samples were used to test for scale and scope effects.  A choice-modelling (CM) analysis was used to elicit household WTP for improvements in environmental quality attributes in the Namoi catchment. The approach was developed so that value estimates could be more accurately transferred between different action scopes.
Tipo: Report
Palavras-chave: Choice modelling; Scale effect; Scope effect; Embedding; Non-market valuation; Catchment planning; Environment.; Community/Rural/Urban Development; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94891

An Economic Framework for Forecasting Land-Use and Ecosystem Change
Provedor de dados: 31
Autores: Lewis,   David J.
This paper develops a joint econometric-simulation framework to forecast detailed empirical distributions of the spatial pattern of land-use and ecosystem change. In-sample and out-of-sample forecasting tests are used to examine the performance of the parcel-scale econometric and simulation models, and the importance of multiple forecasting challenges is assessed. The econometric-simulation method is integrated with an ecological model to generate forecasts of the probability of localized extinctions of an amphibian species. The paper demonstrates the potential of integrating economic and ecological models to generate ecological forecasts in the presence of alternative market conditions and land-use policy constraints.
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/92218

Maximum likelihood estimation of generalized linear models with covariate measurement error
Provedor de dados: 31
Autores: Rabe-Hesketh,   Sophia; Skrondal,   Anders; Pickles,   Andrew.
Generalized linear models with covariate measurement error can be estimated by maximum likelihood using gllamm, a program that fits a large class of multilevel latent variable models (Rabe-Hesketh, Skrondal, and Pickles 2004). The program uses adaptive quadrature to evaluate the log likelihood, producing more reliable results than many other methods (Rabe-Hesketh, Skrondal, and Pickles 2002). For a single covariate measured with error (assuming a classical measurement model), we describe a “wrapper” command, cme, that calls gllamm to estimate the model. The wrapper makes life easy for the user by accepting a simple syntax and data structure and producing extended and easily interpretable output. The commands for preparing the data and running gllamm can...
Tipo: Journal Article
Palavras-chave: Covariate measurement error; Measurement model; Congeneric measurement model; Factor model; Adaptive quadrature; Nonparametric maximum likelihood; NPMLE; Latent class model; Empirical Bayes; Simulation; Wrapper; Sensitivity analysis; Gllamm; Cme; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116185

Determinants of the Adaption of Organic Agriculture in Egypt Using a Duration Analysis Technique
Provedor de dados: 31
Autores: Radwan,   Amr; Gil,   Jose Maria; Diab,   Yaser A.A.; Abo-Nahoul,   Mohamed A.
A very important pillar of the modernization of the Egyptian agriculture depends upon the exportation of the high value added products such as organic products. In spite of the importance of the organic agriculture within the Egyptian agriculture sector and up to our knowledge, it does not exist in Egypt until now any study that try to determine and analyze the determinant factors of the adaption of the organic agriculture within the Egyptian farms. In this study, we focus on this issue. A survey with a representative sample of organic and non-organic farms in Upper Egypt area was carried out. Using obtained data set we apply duration analysis techniques to assess the effect of different explanatory variables on both the adoption of organic agriculture...
Tipo: Conference Paper or Presentation
Palavras-chave: Organic agriculture; Duration analysis; Egypt; Research Methods/ Statistical Methods; C41; Q1.
Ano: 2011
URL: http://purl.umn.edu/108961

Sustainability Dilemmas and their Solution Strategies by Committed Food Businesses
Provedor de dados: 31
Autores: Mikkola,   Minna; Risku-Norja,   Helmi; Post,   Anna.
Food businesses feel the call for sustainable development (SD). This paper about the Finnish and Swedish food system actors about their understanding of and activities towards sustainability shows that there is commitment for solving aspects of sustainability and different strategies to do this. However, the food businesses also seem to get entangled with various dilemmas regarding sustainability, and to perceive contradictions between economic, environmental and social issues; however, these situations may also turn synergistic. The businesses studied expressed commitment to sustainable solutions interpreted by their sustainability strategies. The first identified strategy was a 'self‐made' effort, whereby businesses absorbed economically, environmentally...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100462

Improvement of the AROPAj model covering a large range of agricultural activities at wide (UE) and high resolution (mapping of farm types) scales
Provedor de dados: 31
Autores: Baranger,   Edouard; Clodic,   Melissa; Galko,   Elodie; Jayet,   Pierre-Alain; Zakharov,   Paul.
Mathematical programming models suit policy makers' needs for assessing impacts of new policies and modellers' needs for new parameters, constraints and activities to represent the phenomenon under study. The AROPAj model aims at taking into account any geographical extension of the European Union as well as the continuously changing Common Agricultural Policy. As well as the European policies will include more and more environmental problems, AROPAj will be more and more designed toward environmental assessments. Two improvement axes are set up. Biophysical models are used to refine the design of farming systems represented in the economic model and to estimate nitrogen pollutant emissions. Down-scaling methods are coupled with the regional farm group...
Tipo: Conference Paper or Presentation
Palavras-chave: Supply model; EU; Linear programming; Agriculture; Environment; Coupling; Down-scaling; Environmental Economics and Policy; Farm Management; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6664

Suggestions on Stata programming style
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Various suggestions are made on Stata programming style, under the headings of presentation, helpful Stata features, respect for datasets, speed and effciency, reminders, and style in the large.
Tipo: Journal Article
Palavras-chave: Stata language; Programming style; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117546

Using a Modified Payment Card Survey on Chinese Consumers’ Willingness to Pay for Fair Trade Coffee: Would the Starting Point Matter
Provedor de dados: 31
Autores: Yang,   Shang-Ho; Hu,   Wuyang.
Coffee consumption in China is increasing rapidly over the recent years. This study offers one of the few initial attempts to not only understand general consumption behavior associated with Chinese coffee, but to explore the viability of niche markets for coffee with the credence attribute “fair trade”. A modified payment card approach was adopted as the consumer willingness to pay elicitation method. Survey results of 564 consumers from the city of Wuhan, China suggest a positive attitude toward coffee as an alternative drink and a willingness to pay a premium for “fair trade” coffee. This study also explores and describes the potential impact of starting point bias, which has been relatively well documented in the dichotomous choice literature but has...
Tipo: Conference Paper or Presentation
Palavras-chave: Coffee; Fair trade; Payment card; Starting point bias; Willingness to pay; Agribusiness; Consumer/Household Economics; Food Security and Poverty; International Development; Marketing; Research Methods/ Statistical Methods; D12; Q13.
Ano: 2011
URL: http://purl.umn.edu/103720

INSTRUMENT CHOICE AND BUDGET-CONSTRAINED TARGETING
Provedor de dados: 31
Autores: Horan,   Richard D.; Claassen,   Roger; Agapoff,   Jean; Zhang,   Wei.
We analyze how choosing to use a particular type of instrument for agri-environmental payments, when these payments are constrained by the regulatory authority's budget, implies an underlying targeting criterion with respect to costs, benefits, participation, and income, and the tradeoffs among these targeting criteria.  The results provide insight into current policy debates.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20387

Modeling Nonlinearities in Farmland Values: A Dynamic Panel Threshold Error-Correction Model
Provedor de dados: 31
Autores: Onel,   Gulcan.
Earlier studies usually indicate that farmland prices and cash rents are not cointegrated, a finding that seems at odds with the implications of the present value model. The main objective of this study is to explore whether this absence of empirical support for the present value model can be attributed to the restrictiveness of conventional time series methods. I suggest a panel unit root model with two regimes in which the adjustment process may be characterized by the presence of thresholds and discontinuities reflecting the presence of transactions costs and other barriers to adjustment. Using farmland value and cash rents data for 10 agricultural states of the U.S. between 1960 and 2008, empirical findings give modest improvement over the linear unit...
Tipo: Conference Paper or Presentation
Palavras-chave: Present Value Model; Transactions costs; Thresholds; Panel unit root; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49445

Abstracts of Selected Papers, NAREA Annual Meetings, Burlington, Vermont, June 7-10, 2009
Provedor de dados: 31
Tipo: Journal Article
Palavras-chave: Agribusiness; Agricultural and Food Policy; Agricultural Finance; Community/Rural/Urban Development; Consumer/Household Economics; Crop Production/Industries; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Industrial Organization; Institutional and Behavioral Economics; International Development; International Relations/Trade; Labor and Human Capital; Land Economics/Use; Livestock Production/Industries; Marketing; Political Economy; Production Economics; Productivity Analysis; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/55550

Modelling the Hungarian Agriculture: a methodological overview of the FARM-T model
Provedor de dados: 31
Autores: Himics,   Mihaly.
This paper provides an opportunity for the reader to get an insight into the current modelling work at the Research Institute for Agricultural Economics, Hungary (AKI). After giving a short summary of the applied econometric models in the past decade, our latest development, the farm group model FARM-T will be introduced. Before introducing FARM-T in details, we devote the second part of the paper to collect all the major challenges we faced during the model development process, when we tried to establish a model structure, with which the possible effects of the introduction of the Single Payment Scheme (SPS) in Hungary can be properly estimated. Therefore, this chapter is meant to explain our motivation for choosing the applied model concept. In the...
Tipo: Conference Paper or Presentation
Palavras-chave: FARM-T; Partial equilibrium model; Farm groups; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6697

The Blinder–Oaxaca decomposition for nonlinear regression models
Provedor de dados: 31
Autores: Sinning,   Mathias; Hahn,   Markus; Bauer,   Thomas K.
In this article, a general Blinder–Oaxaca decomposition for nonlinear models is derived, which allows the difference in an outcome variable between two groups to be decomposed into several components. We show how, using nldecompose, this general decomposition can be applied to different models with discrete and limited dependent variables. We further demonstrate how the standard errors of the estimated components can be calculated by using Stata's bootstrap command as a prefix.
Tipo: Article
Palavras-chave: Nldecompose; Blinder–Oaxaca decomposition; Nonlinear models; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122616

Controlling for time-dependent confounding using marginal structural models
Provedor de dados: 31
Autores: Fewell,   Zoe; Hernan,   Miguel A.; Wolfe,   Frederick; Tilling,   Kate; Choi,   Hyon; Sterne,   Jonathan A.C.
Longitudinal studies in which exposures, confounders, and outcomes are measured repeatedly over time have the potential to allow causal inferences about the effects of exposure on outcome. There is particular interest in estimating the causal effects of medical treatments (or other interventions) in circumstances in which a randomized controlled trial is difficult or impossible. However, standard methods for estimating exposure effects in longitudinal studies are biased in the presence of time-dependent confounders affected by prior treatment.  This article describes the use of marginal structural models (described by Robins, Hernán, and Brumback [2000]) to estimate exposure or treatment effects in the presence of time-dependent confounders affected by...
Tipo: Journal Article
Palavras-chave: Marginal structural models; Causal models; Weighted regression; Survival analysis; Logistic regression; Confounding; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116267

MULTIPERIOD OPTIMIZATION:  DYNAMIC PROGRAMMING VS. OPTIMAL CONTROL:  DISCUSSION
Provedor de dados: 31
Autores: Howitt,   Richard E.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32274

Demand–system estimation: Update
Provedor de dados: 31
Autores: Poi,   Brian P.
The nlsur command is better suited to demand-system estimation than the suite of ado-files provided in Poi (2002, Stata Journal 2: 403–410) because it is faster and requires only one ancillary ado-file. This article replicates the results presented in Poi (2002) by using nlsur instead of ml.
Tipo: Article
Palavras-chave: Nlsur; Demand-system estimation; Nonlinear estimation; Maximum likelihood; Demand equations; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122621

Efficiency and Productivity Changes in the Indian Food Processing Industry: Determinants and Policy Implications
Provedor de dados: 31
Autores: Ali,   Jabir; Singh,   Surendra P.; Ekanem,   Enefiok P.
This paper analyses efficiency and productivity changes in 12 broad segments of food manufacturing industries during pre and post liberalisation periods, covering a period of two decades, from 1980-1981 to 2001-2002. The nonparametric Data Envelopment Analysis (DEA) approach is used to compute the Malmquist Total Factor Productivity (TFP) change, which has been further decomposed into efficiency and technical change. This paper also evaluates the performance of major inputs used in the food processing industry and identifies the causes of inefficiency across various segments. Based on the findings, the paper gives suggestions that can be used by policy makers and food processors in making decisions regarding various technical and managerial aspects to...
Tipo: Journal Article
Palavras-chave: Technical Efficiency; Total Factor Productivity (TFP); Food Processing; Data Envelopment Analysis (DEA); India; Productivity Analysis; Research Methods/ Statistical Methods; Q10; Q11; Q13.
Ano: 2009
URL: http://purl.umn.edu/53745

TESTING FOR DISEQUILIBRIUM IN THE DEMAND FOR AGRICULTURAL INPUTS
Provedor de dados: 31
Autores: LeBlanc,   Michael; Lutton,   Thomas.
A dynamic system of cost-share equations for agricultural inputs is used to test for the presence of input disequilibrium.  This dynamic system incorporates a disequilibrium adjustment process into input-share equations derived from a translog cost function.  The disequilibrium process is represented as a generalized partial adjustment model where disequilibrium in one input may affect other inputs.  Results from this analysis suggest applications of translog share systems to agriculture under static equilibrium assumptions are inappropriate.
Tipo: Journal Article
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/32382

Computing interaction effects and standard errors in logit and probit models
Provedor de dados: 31
Autores: Norton,   Edward C.; Wang,   Hua; Ai,   Chunrong.
This paper explains why computing the marginal effect of a change in two variables is more complicated in nonlinear models than in linear models. The command inteff computes the correct marginal effect of a change in two interacted variables for a logit or probit model, as well as the correct standard errors. The inteff command graphs the interaction effect and saves the results to allow further investigation.
Tipo: Journal Article
Palavras-chave: Inteff; Interaction terms; Logit; Probit; Nonlinear models; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116235

A COMPARISON OF CRITERIA FOR EVALUATING RISK MANAGEMENT STRATEGIES
Provedor de dados: 31
Autores: Baker,   Timothy G.; Gloy,   Brent A.
Several criteria that produce rankings of risk management alternatives are evaluated.  The criteria considered are Value at Risk, the Sharpe ratio, the necessary condition for first degree stochastic dominance with a risk free asset, and the necessary condition for second degree stochastic dominance with a risk free asset.  The effectiveness of the criteria increases as decision-makers are assumed to be more risk averse and have greater access to financial leverage.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/21726

A Mata Geweke–Hajivassiliou–Keane multivariate normal simulator
Provedor de dados: 31
Autores: Gates,   Richard.
An accurate and efficient numerical approximation of the multivariate normal (MVN) distribution function is necessary for obtaining maximum likelihood estimates for models involving the MVN distribution. Numerical integration through simulation (Monte Carlo) or number-theoretic (quasi–Monte Carlo) techniques is one way to accomplish this task. One popular simulation technique is the Geweke–Hajivassiliou–Keane MVN simulator. This paper reviews this technique and introduces a Mata function that implements it. It also computes analytical first-order derivatives of the simulated probability with respect to the variables and the variance–covariance parameters.
Tipo: Journal Article
Palavras-chave: GHK; Maximum simulated likelihood; Monte Carlo; Quasi–Monte Carlo; Importance sampling; Number-theoretic statistics; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117569

Factors Influencing Cotton Farmers’ Perceptions about the Importance of Information Sources in Precision Farming Decisions
Provedor de dados: 31
Autores: Velandia,   Margarita M.; Lambert,   Dayton M.; Mendieta,   Maria P.; Roberts,   Roland K.; Larson,   James A.; English,   Burton C.; Rejesus,   Roderick M.; Mishra,   Ashok K.
Information generated by precision farming technologies is of particular importance to producers. Precision farming technologies implies the ability to improve the management of production factors using site-specific information. This study examines factors influencing cotton farmers’ perceptions about the importance of crop consultants, farm input dealerships, Extension, other farmers, trade shows, the Internet and printed news/media for making precision farming decisions using a rank ordered logit model (ROLM). Results suggest that age, land tenure, income, percentage of income from farming, and location may affect farmers’ perceptions about the importance of different information sources when making decisions about precision farming technologies....
Tipo: Conference Paper or Presentation
Palavras-chave: Information-source preferences; Rank Ordered Logit Model; Precision Farming; Production Economics; Research Methods/ Statistical Methods; Q16; C25.
Ano: 2011
URL: http://purl.umn.edu/103752

Growing more rice with less water:  Increasing water productivity in rice-based cropping systems – Progress of research, 1 July 2001 to 30 June 2002
Provedor de dados: 31
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural research; Research projects; Experiments; Rice; Fertilizers; Farmer participation; Irrigation programs; Water balance; Flow measurement; Remote sensing; Cropping systems; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Crop Production/Industries; Farm Management; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2003
URL: http://purl.umn.edu/92660

Generalized least squares for trend estimation of summarized dose–response data
Provedor de dados: 31
Autores: Orsini,   Nicola; Bellocco,   Rino; Greenland,   Sander.
This paper presents a command, glst, for trend estimation across different exposure levels for either single or multiple summarized case–control, incidence-rate, and cumulative incidence data. This approach is based on constructing an approximate covariance estimate for the log relative risks and estimating a corrected linear trend using generalized least squares. For trend analysis of multiple studies, glst can estimate fixed- and random-effects metaregression models.
Tipo: Journal Article
Palavras-chave: Glst; Dose–response data; Generalized least squares; Trend; Meta-analysis; Metaregression; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117556

PRODUCER PREDICTION OF OPTIMAL SIRE CHARACTERISTICS IMPACTING FARM PROFITABILITY IN A STOCHASTIC BIO-ECONOMIC DECISION FRAMEWORK
Provedor de dados: 31
Autores: Pierce,   Vern L.; Herring,   William.
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21691

Efficiency = Equity and Other Musings on Economics and Sustainable Development
Provedor de dados: 31
Autores: Sinner,   Jim.
Conventional wisdom says that equity concerns are beyond the scope of economic analysis and that achieving equity objectives will often come at a cost in terms of efficiency. Examination of the underlying meaning of efficiency and how it is defined, however, reveals that this tension between efficiency and equity is more apparent than real. The paper also explores the application of other economic concepts to the field of sustainable development, including the use of discounting for present value, Gross Domestic Product as a measure of well-being, and rational utility maximisation vs. bounded rationality as models of human behaviour.
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/97778

Stata tip 16: Using input to generate variables
Provedor de dados: 31
Autores: Kohler,   Ulrich.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117505

A whole farm comparison of irrigated cotton rotations in the Lower Namoi Valley, NSW
Provedor de dados: 31
Autores: Powell,   Janine; Scott,   J. Fiona.
A whole farm budget for a representative farm in the Lower Namoi Valley in northern NSW was used to analyse the financial implications of a comparative rotational experiment of four cotton-based rotations conducted in recent years at the Australian Cotton Research Institute, near Narrabri. The model was used to compare the rotations, which highlighted the importance of crop selection for the financial performance of the business. Apart from providing a broad brush picture of financial performance, the model also had a stochastic component which was used to analyse the effect of variable commodity prices on the whole farm profitability of each rotation. Mean results indicated a positive return for all rotations within the representative farm budgets for the...
Tipo: Conference Paper or Presentation
Palavras-chave: Financial Economics; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/100698

Dynamics in Inter‐Firm Collaboration: The Impact of Alliance Capabilities on Performance
Provedor de dados: 31
Autores: Ziggers,   Gerrit Willem; Tjemkes,   Brian.
In this study we question the direct relationship between a firm’s alliance capability and alliance performance. We contend that this relationship is mediated through post‐formation factors such as alliance management and relational quality. Drawing from the Resource Based View a model is presented that explicates these indirect relationships. Partial least squares analysis was used to test three hypotheses, using a sample of Dutch alliance managers responsible for non‐equity alliances in agribusiness and the food industry. Our empirical findings affirm the hypothesized indirect relationships between a firm’s alliance capability and alliance performance.
Tipo: Journal Article
Palavras-chave: Alliance capability; Relational quality; Alliance management; Alliance performance; Resource Based View; Non‐equity alliances; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/97232

Using Double-Log Imperfect Import Substitutes Model to Estimate Compensated Elasticities and Welfare Impacts
Provedor de dados: 31
Autores: Musyoka,   M.P.
Decisions on the effects of safeguard mechanisms have been more on theoretical grounds often due to lack of precise estimation of elasticities that can be used to calibrate welfare effects. Alston et.al., (2002) demonstrate that the double logarithmic demand models can be augmented by Slutsky equation to create compensated demand equations which, when estimated result into precise compensates elasticities important for welfare analysis. This study demonstrates a similar adjustment on a dynamic double log Imperfect Import substitutes model to allow for estimation of compensated and uncompensated elasticities. Elasticities from three estimators OLS, SURE and IV indicate that imported wheat, maize and rice are normal commodities in Kenya. The uncompensated...
Tipo: Journal Article
Palavras-chave: Safeguard mechanism; Imperfect import substitutes; Welfare impacts; Wheat; Kenya; Research Methods/ Statistical Methods; Q17; Q18.
Ano: 2010
URL: http://purl.umn.edu/95774

Pricing Options on Commodity Futures: The Role of Weather and Storage
Provedor de dados: 31
Autores: Bozic,   Marin; Fortenbery,   T. Randall.
Options on agricultural futures are popular financial instruments used for agricultural price risk management and to speculate on future price movements. Poor performance of Black’s classical option pricing model has stimulated many researchers to introduce pricing models that are more consistent with observed option premiums. However, most models are motivated solely from the standpoint of the time series properties of futures prices and need for improvements in forecasting and hedging performance. In this paper we propose a novel arbitrage pricing model motivated from the economic theory of optimal storage, and consistent with implications of plant physiology on the importance of weather stress. We introduce a pricing model for options on futures based...
Tipo: Conference Paper or Presentation
Palavras-chave: Arbitrage pricing model; Options on futures; Generalized lambda distribution; Theory of storage; Skewness; Agribusiness; Agricultural Finance; Crop Production/Industries; Financial Economics; Research Methods/ Statistical Methods; Risk and Uncertainty; G13; Q11; Q14.
Ano: 2011
URL: http://purl.umn.edu/103638

Analysis of Country of Origin Labeling for Food Products in Taiwan Using Auction Experiment with Tasting
Provedor de dados: 31
Autores: Chern,   Wen S.; Lin,   Huei-Ching.
This study attempts to evaluate the economic benefits of the country of origin labeling (COOL) in Taiwan.  A Vickrey second-price sealed-bid auction was conducted to estimate the consumer’s willingness to pay for Taiwan products vs. those from China and Vietnam. Our experiment was designed to investigate the impacts of product tasting on bidding behavior. The regression results show that tasting raised bids for Taiwan and China teas, but lowered bids for Vietnam tea. The econometric results show very high premiums for Taiwan products. Taiwanese consumers and food producers stand to benefit greatly with COOL.
Tipo: Conference Paper or Presentation
Palavras-chave: Auction Experiment; Country of Origin Labeling; Tobit; Willingness to Pay; Bid Premium; Taiwan; China; Vietnam; Tea; Plum; Import; Food; Agribusiness; Agricultural and Food Policy; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Research Methods/ Statistical Methods; Q13; D12.
Ano: 2011
URL: http://purl.umn.edu/103219

Exploratory analysis of single nucleotide polymorphism (SNP) for quantitative traits
Provedor de dados: 31
Autores: Cleves,   Mario A.
With the decreasing cost and the increasing ability to quickly genotype single nucleotide polymorphisms (SNP) across the human genome, large databases containing possibly hundreds of typed SNPs are becoming common in population-based studies of quantitative traits. Testing for association between individual SNPs and the quantitative trait is an important first step in the discovery of disease susceptibility SNPs. This task, however, could be time-consuming and tedious if a large number of SNPs is involved. In this article, I introduce two new commands designed to facilitate the screening and testing of multiple SNPs for possible association with quantitative traits.
Tipo: Journal Article
Palavras-chave: Hwsnp; Qtlsnp; Genetic epidemiology; Genetic linkage; QTL; Biallelic marker; Single nucleotide polymorphisms; Hardy–Weinberg; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117508

Stata tip 37: And the last shall be first
Provedor de dados: 31
Autores: Baum,   Christopher F.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/119248

A GRAPHICAL ILLUSTRATION OF THE DULOY PARADOX
Provedor de dados: 31
Autores: Powell,   Alan A.
As a guide to the reorganisation of resources, the MVP /MFC comparison can result in the adjustment of resources to new levels which are actually further away from their optimal levels than their original values. Duloy illustrated this paradox mathematically in the context of fitted agricultural production functions in a paper published in 1959. His result is of considerable importance to agricultural micro-economists; however, it is not easy to teach to students of poor mathematical background. The need to be able to teach in literary form the Duloy Paradox--that increasing the application of a factor with a relatively high MVP can result in a movement away from the optimum input-mix--led to the following analysis.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1970
URL: http://purl.umn.edu/22410

PRODUCTIVITY GROWTH AND ITS COMPONENTS IN CHINESE AGRICULTURE AFTER REFORMS
Provedor de dados: 31
Autores: Wu,   Shunxiang; Walker,   David J.; Devadoss,   Stephen.
We investigate the temporal and spacial nature of productivity growth and its components in Chinese agriculture from 1980-1995 using nonparametric Malmquist procedures. The results indicate that the high rate of technical progress and deterioring efficiency performance coexisted in Chinese agriculture.  Policies encouraging technical progress should be accompanied by successful technological diffusions.
Tipo: Conference Paper or Presentation
Palavras-chave: Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20817

COMPARATIVE STATICS OF MONEY-GOODS SPECIFICATIONS OF THE UTILITY FUNCTION
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
The introduction of real-cash balances into the neoclassical model of the consumer wrecks havoc, in general, on the empirically observable refutable comparative statics properties of the model.  We provide the most general solution of this problem to date by deriving a symmetric and negative semidefinite generalized Slutsky matrix that is empirically observable and which contains all other such comparative statics results as a special case.  In addition, we clarify and correct two aspects of Samuelson and Sato’s (1984) treatment of this problem.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/11953

Speaking Stata: Graphing model diagnostics
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Plotting diagnostic information calculated from residuals and fitted values is a long-standard method for assessing models and seeking ways of improving them. This column focuses on the statistical mainstream defined by regression models for continuous responses, treated in a broad sense to include (for example) generalized linear models. After some comments on the history of such ideas (and even their anthropology and psychology), the commands available in official Stata are reviewed, and a modeldiag package is introduced. A detailed example on fuelwood yield from fallow areas in Nigeria illustrates a variety of general points and specific tips.
Tipo: Journal Article
Palavras-chave: Modeldiag; Anovaplot; Indexplot; Ofrtplot; Ovfplot; Qfrplot; Racplot; Rdplot; Regplot; Rhetplot; Rvfplot2; Rvlrplot; Rvpplot2; Graphics; Diagnostics; Regression; Generalized linear models; Analysis of variance; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116273

A pluralistic methodology for analysing supply chains
Provedor de dados: 31
Autores: Murray-Prior,   Roy B.; Rola-Rubzen,   Maria Fay; McGregor,   Murray J.; Batt,   Peter J.; Concepcion,   Sylvia B.; Rasco,   Eufemio; Digal,   Larry N.; Manalili,   Nerlita M.; Moran,   Antonio; Ellson,   Adela; Montiflor,   Marilou O.; Hualda,   Luis; Migalbin,   Lorraine.
Special problems are presented when analysing supply chains because of the complexity of the relationships. In addressing this problem for a vegetable supply chain in Mindanao a pluralistic methodology is used. A soft systems framework was used to structure and analyse the problem and identify relevant systems. Issues we are addressing are efficiencies along the supply chain (including input supply issues, output marketing, quality control and transport) and relationships between the various participants in the supply chain. Qualitative and quantitative data collection methods have been used. Analysis is being conducted with qualitative data analysis techniques, LP farm household models, transaction cost economics, gap analysis, factor analysis and...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/57926

ESTIMATION OF A U.S. DAIRY SECTOR MODEL BY MAXIMUM SIMULATED LIKELIHOOD
Provedor de dados: 31
Autores: Arias,   Carlos; Cox,   Thomas L.
This paper estimates a multivariate tobit system of monthly wholesale dairy prices where 4 prices are lower censored by the dairy price support program.  Using Maximum Simulated Likelihood (MSL) we test/correct for the effects of simulation noise and present two tests for estimating multivariate versus the singel tobit equations.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20804

Of Junk Food and Junk Science
Provedor de dados: 31
Autores: Collins,   Robert A.; Baker,   Gregory A.
The popular press has triumphantly announced that the cause of the obesity epidemic is “junk food.” After a moment’s reflection, however, it seems likely that the true causal structure of the obesity epidemic can be neither single-equation nor univariate. Therefore, while the hypothesis that “junk food” is the cause of obesity has little a priori plausibility, these articles in the popular press present a testable hypothesis that, in spite of some measurement impossibilities, is tested here. While one can always argue about p values etc., it is safe to say that the results show no evidence to indicate support for a causal link. The second section of the paper explains this result and suggests a rudimentary structural model of obesity that begins to address...
Tipo: Journal Article
Palavras-chave: Obesity; Junk food; Granger-causality; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession; Q10; Q16.
Ano: 2009
URL: http://purl.umn.edu/53799

THE DERIVATION OF BOUNDS TO THE GLOBAL OPTIMUM OF AN INTEGER FIXED CHARGE PROBLEM
Provedor de dados: 31
Autores: Roe,   Terry L.
A computationally efficient method is developed in this paper for deriving a sequence of bounds to the global value of an integer fixed charge problem where certain functions are linear only for positive values of the argument and have a jump discontinuity at the origin. While other efficient approximate techniques are available, the technique developed here offers the additional advantage of permitting the sequential error inherent in approximate solutions to be determined.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1970
URL: http://purl.umn.edu/13301

Willingness to pay for kerbside recycling the Brisbane Region
Provedor de dados: 31
Autores: Gillespie,   Robert; Bennett,   Jeffrey W.
Waste policy in Australia has a strong focus on kerbside recycling. This has a range of costs and benefits to the community, including non-market benefits. However, in Australia, there has been little investigation of household willingness to pay for kerbside recycling. This paper used mixed logit choice modelling to estimate the willingness to pay of households in Brisbane, Australia for kerbside waste collection services including kerbside recycling. It was found that households in Brisbane have a positive and significant willingness to pay of $131.49 per annum for fortnightly kerbside recycling and would be willing to pay an additional $18.30 to increase the frequency of this service to weekly. The utility of respondents was, however, found to decline...
Tipo: Report
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/107805

Genetically Modified Crops, an Input Distance Function Approach
Provedor de dados: 31
Autores: Gardner,   Justin G.; Nehring,   Richard F.; Nelson,   Carl H.
Our initial findings indicate that GM crops do not contribute to the decline of traditional family farms. We make a significant methodological impact by using the within transformation to remove unobserved individual effects and demonstrate that the within transformation results in ML estimates that are identical to OLS estimates.
Tipo: Conference Paper or Presentation
Palavras-chave: Production Economics; Genetically Modified Crops; Distance Function; Stochastic Frontier Analysis; Production Economics; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6800

The Agrifood Districts in the New Millennium
Provedor de dados: 31
Autores: Brasili,   Cristina; Fanfani,   Roberto.
The Italian Industrial Districts (IDs) are considered to be one of the main reasons for the rapid industrial development and success of Italy since the Second World War. The SME's have also played an important role in this. In this paper we outline the general characteristics of the ID approach and the main structural changes in the new millennium, due to them facing the process of globalization. The distinctive figures of the agrifood districts and their mosaic style of development are than analysed to highlight the similarities and differences between them and the other IDs. First show that they are more relevant and that their geographical distribution is more important than those of other recently analysed Italian ID's. The different zones of origin of...
Tipo: Conference Paper or Presentation
Palavras-chave: Economic Development; Agrifood Districts; Industrial Districts (IDs); SME’s role; Efficiency of firms; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; A1; C23; O1; Q10; Q17.
Ano: 2010
URL: http://purl.umn.edu/100456

ANALYSIS OF BREAKEVEN YIELD GAINS AND INPUT COST SAVINGS FOR A COTTON YIELD MONITORING SYSTEM
Provedor de dados: 31
Autores: Larson,   James A.; English,   Burton C.; Roberts,   Roland K.; Cochran,   Rebecca L.
Cotton yield monitors are a new technology and their costs have not been thoroughly evaluated.  This research evaluated yield gains and input savings required to cover the cost of a monitor.  Spreading monitor costs over multiple VRT decisions reduces the required yield gain or cost savings for any one decision.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35081

Prediction model of total farmland under the condition of unbalanced economic growth
Provedor de dados: 31
Autores: Chen,   Xiao-yuan; Chen,   Xiao-zhu; Zhang,   Lei.
The aim of this paper is to discuss the prediction method of the total farmland demand combining with the land utilization status and planning practice. [Method] We use the multiple regression prediction method and time series prediction method. [Result] By applying the data of farmland comprehensive production capacity, population development, changes of arable land, fixed assets investment and so on in Bijie Area, we have established the prediction models of total farmland demand, and determined the optimum model as the prediction proposal of total farmland in Bijie Area through evaluation and explanation. [Conclusion] The prediction proposal is compared with the "shadow index" of Bijie Area, which is instructed by the macro-control of Guizhou Province....
Tipo: Thesis or Dissertation
Palavras-chave: Total farmland; Shadow index; Unbalanced economy; China; Agricultural Finance; Financial Economics; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53470

Social Impact Assessment of the Proposed Dodds-Roundhill Coal Gasification Project
Provedor de dados: 31
This project report was completed by 14 graduate and undergraduate students in a social impact assessment course (AREC 450-550) during the Winter Term, January to April, 2009. The overall goal of this project was to learn specific concepts and methods for social impact assessment by undertaking such an assessment for the proposed Dodds-Roundhill Coal Gasification project (Southeast of Edmonton, Alberta). The social impact assessment is composed of four major components: (1) scoping of relevant social indicators, (2) social impacts within municipalities, (3) social impacts within the farming region, and (4) a comparative case study of social impacts. Together, the four project reports provide insights into the potential social impacts from the proposed coal...
Tipo: Working or Discussion Paper
Palavras-chave: Environmental impact assessment; Social indicators; Comparative case study; Social research methods; Energy policy; Community/Rural/Urban Development; Land Economics/Use; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession; R52; R11; Q34.
Ano: 2009
URL: http://purl.umn.edu/91421

Integrated participatory modelling of irrigated agriculture: the case study of the reorganisation of a water management system in Italy
Provedor de dados: 31
Autores: Bazzani,   Guido Maria.
The paper presents an application of the new version of the 'Decision Support for Irrigated agriculture' DSIrr designed to integrate water and agricultural policy analysis and to support participatory decision process. The tool is a scenario manager for bio-economic farm models considering climatic, agronomic, hydraulic, socio-economic and environmental aspects. The paper offers some insight on the decomposition approach adopted to integrate economic analysis at different scales by illustrating a case study conducted in Italy to support an ex ante evaluation of a water management system reorganisation. Reduce water consumption is a strategic objective which pricing policy cannot address given technical constraints. The replacement of the existing...
Tipo: Conference Paper or Presentation
Palavras-chave: Water; Agriculture; Economic analysis; Modelling and tools; Participatory process; Agricultural and Food Policy; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6496

Estimation and comparison of receiver operating characteristic curves
Provedor de dados: 31
Autores: Pepe,   Margaret S.; Longton,   Gary M.; Janes,   Holly.
The receiver operating characteristic (ROC) curve displays the capacity of a marker or diagnostic test to discriminate between two groups of subjects, cases versus controls. We present a comprehensive suite of Stata commands for performing ROC analysis. Nonparametric, semiparametric, and parametric estimators are calculated. Comparisons between curves are based on the area or partial area under the ROC curve. Alternatively, pointwise comparisons between ROC curves or inverse ROC curves can be made. We describe options to adjust these analyses for covariates and to perform ROC regression in a companion article. We use a unified framework by representing the ROC curve as the distribution of the marker in cases where we have standardized it to the control...
Tipo: Article
Palavras-chave: Roccurve; Comproc; Receiver operating characteristic curve; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122693

Graphical representation of interactions
Provedor de dados: 31
Autores: Barthel,   Friederike Maria-Sophie; Royston,   Patrick.
We provide a program to illustrate interactions between treatment and covariates or between two covariates by using forest plots under either the Cox proportional hazards or the logistic regression model. The program is flexible in both the possibility of illustrating more than one interaction at a time and variable specifications of scale.
Tipo: Journal Article
Palavras-chave: Fintplot; Interaction; Forest plot; Randomized controlled trial; Survival analysis; Logistic regression; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117585

Computational Complexity in Additive Hedonic Games
Provedor de dados: 31
Autores: Sung,   Shao Chin; Dimitrov,   Dinko.
We investigate the computational complexity of several decision problems in hedonic coalition formation games and demonstrate that attaining stability in such games remains NP-hard even when they are additive. Precisely, we prove that when either core stability or strict core stability is under consideration, the existence problem of a stable coalition structure is NP-hard in the strong sense. Furthermore, the corresponding decision problems with respect to the existence of a Nash stable coalition structure and of an individually stable coalition structure turn out to be NP-complete in the strong sense.
Tipo: Working or Discussion Paper
Palavras-chave: Additive Preferences; Coalition Formation; Computational Complexity; Hedonic Games; NP-hard; NP-complete; Research Methods/ Statistical Methods; C63; C70; C71; D02; D70; D71.
Ano: 2008
URL: http://purl.umn.edu/46655

A HEDONIC PRICE FUNCTION FOR AUSTRALIAN PREMIUM TABLE WINE
Provedor de dados: 31
Autores: Oczkowski,   Edward A.
A hedonic price function, relating the price of Australian wine to its attributes, is estimated. Six attribute groups are found to be statistically important in explaining deviations from average wine prices, i.e., quality, cellaring potential, grape variety/style, grape region, grape vintage and producer size. Various interaction terms between these variables and the impact of the year of marketing are also modelled. The consequent marketing implications for producers and consumers are discussed.
Tipo: Journal Article
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/22421

Bayesian Learning and the Regulation of Greenhouse Gas Emissions
Provedor de dados: 31
Autores: Karp,   Larry S.; Zhang,   Jiangfeng.
We study the importance of anticipated learning - about both environmental damages and abatement costs - in determining the level and the method of controlling greenhouse gas emissions. We also compare active learning, passive learning, and parameter uncertainty without learning. Current beliefs about damages and abatement costs have an important effect on the optimal level of emissions, However, the optimal level of emissions is not sensitive either to the possibility of learning about damages. or to the type of learning (active or passive), Taxes dominate quotas, but by a small margin.
Tipo: Working or Discussion Paper
Palavras-chave: Climate change; Uncertainty; Bayesian learning; Asymmetric information; Choice of instruments; Dynamic optimization; Environmental Economics and Policy; Research Methods/ Statistical Methods; Cll; C6l; D8; H2l; Q28.
Ano: 2001
URL: http://purl.umn.edu/6214

Prospects for a European Animal Welfare Label from the German Perspective: Supply Chain Barriers
Provedor de dados: 31
Autores: Franz,   Annabell; von Meyer,   Marie; Spiller,   Achim.
The Federal Government of Germany as well as the European Commission are discussing the establishment of an animal welfare label. This label should enable consumers to make a conscious purchasing decision on animal welfare products. Various studies show that many consumers (in Germany around 20 %) prefer products produced under animal friendly conditions. However, the supply of such products is limited. The following study examines the source of this discrepancy by way of an action‐based analytical approach and identifies different barriers within the supply chain that prevent the establishment of a market segment for animal welfare products. Although consumer demand will be decisive for long‐term success, first of all the stakeholders of the supply chain...
Tipo: Journal Article
Palavras-chave: Animal welfare; Label; Supply chain; Neo‐institutionalism.; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Industrial Organization; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/101284

In at the creation
Provedor de dados: 31
Autores: Becketti,   Sean.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117493

Indicators
Provedor de dados: 31
Autores: Perez,   Agnes C.; Blayney,   Donald P.; Hoskin,   Roger.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121238

Tests of Independence in Separable Econometric Models: Theory and Application
Provedor de dados: 31
Autores: Brown,   Donald J.; Deb,   Rahul; Wegkamp,   Marten.
A common stochastic restriction in econometric models separable in the latent variables is the assumption of stochastic independence between the unobserved and observed exogenous variables.  Both simple and composite tests of this assumption are derived from properties of independence empirical processes and the consistency of these tests is established.  As an application, we stimulate estimation of a random quasilinear utility function, where we apply our tests of independence.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/28395

CAUSALITY AMONG FED CATTLE MARKET VARIABLES: DIRECTED ACYCLIC GRAPHS ANALYSIS OF CAPTIVE SUPPLY
Provedor de dados: 31
Autores: Lee,   Andrew C.; Kim,   Man-Keun.
In quantitative research, direction of causality among the variables is often assumed without a rigorous test.  In this study, the directed acyclic graph (DAG) method was used to illuminate causal relationships among fed cattle industry variables, in particular, it was shown that captive supply causes spot market price to change.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20124

UNCERTAINTY, INFORMATION, AND IRREVERSIBLE INVESTMENTS
Provedor de dados: 31
Autores: Graham-Tomasi,   Theodore.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/14047

GAMES, CLUBS AND MODELS: THE ECONOMICS OF AN AGRICULTURAL ECONOMICS SOCIETY
Provedor de dados: 31
Autores: MacAulay,   T. Gordon.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/22857

The Effect of Information on Consumer Preferences of Indoor Plants
Provedor de dados: 31
Autores: Solano,   Alexis; House,   Lisa; Gao,   Zhifeng.
This study primarily focuses on the effect of information on consumers’ purchasing behavior.  If consumers are provided with information about a specific product they may change their beliefs about that product.  This distribution of information may lead the consumer to make the decision either to purchase or not purchase, or the consumer may increase or decrease the amount he or she is willing to pay.  Here, the impact of information about indoor plants’ ability to reduce indoor air pollution on participants is analyzed.  This research will add to the literature on consumer behavior and will also benefit the floriculture industry within the state of Florida. Florida’s floriculture sales have fluctuated during the last ten years.  From 2000 to 2003 the...
Tipo: Presentation
Palavras-chave: Effect of information; Willingness to pay; Conditional logits; Volatile organic compounds; Indoor plants; Floriculture; Agribusiness; Marketing; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/124419

Energy-irrigation nexus in South Asia: Improving groundwater conservation and power sector viability
Provedor de dados: 31
Autores: Shah,   Tushaar; Scott,   Christopher A.; Kishore,   Avinash; Sharma,   Abhishek.
2nd rev. ed.
Tipo: Report
Palavras-chave: Groundwater irrigation; Energy consumption; Irrigation systems; Pumps; Tube wells; Policy making; User charges; Costs; Agricultural and Food Policy; Agricultural Finance; Crop Production/Industries; Marketing; Production Economics; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/44557

Effects of Traceability on the Italian Fresh Vegetables Market: A Demand System Simulation
Provedor de dados: 31
Autores: Caracciolo,   Francesco; Cembalo,   Luigi.
Traceability can serve various purposes in the food sector, including that of chain quality control. However, the aspects that seem to be most frequently required of traceability are those related to food safety. Nevertheless, traceability systems development has recently shifted its focus from the major aspects of food safety to a price premium search approach. Although such an approach often appears to lie behind production strategies, there is no technical or theoretical evidence to support it: traceability systems do not guarantee, per se, quality. On the other hand, a rigorous traceability system that pursues multiple objectives involves costly procedures that are very likely to feed all the way up to the consumer side. The mainstream literature is...
Tipo: Conference Paper or Presentation
Palavras-chave: Traceability; Early potato; Censored demand system estimation; Sample selection approach; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods; D12; C31; C34.
Ano: 2010
URL: http://purl.umn.edu/100503

Chasing Absolute Cost and Profit Savings in a World of Relative Inefficiency
Provedor de dados: 31
Autores: Atkinson,   Scott E.; Dorfman,   Jeffrey H.
Econometric models to estimate allocative and technical inefficiency include stochastic shadow distance frontiers, shadow  cost frontiers, and shadow profit frontiers. In these models, the cost savings from eliminating both sources of inefficiency is  often reported in total and then decomposed into the contribution of each source.  This paper shows that this calculation, as formalized in Kumbhakar (1997) and used extensively in empirical applications over the last 25 years, is non-unique without  additional information that is  typically not available. The same results are obtained for shadow profit and shadow distance systems. The decomposition of cost (profit) savings is underidentified, since it is conditional on the arbitrarily normalized value for...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21058

IDENTIFYING THE SUB-COUNTY ZONE FOR GROWERS: A MODEL-BASED CLASSIFICATION FOR CROSS SECTIONAL AND TIME SERIES DATA
Provedor de dados: 31
Autores: Wang,   H. Holly; Zhang,   Hao.
County-based group crop insurance is not effective to growers in counties with heterogenous production practice.  A model-based cluster and classification method is developed to facilitate the information needed in the study of sub-county-zone-based crop insurance.  Wheat yield data from Whitman, WA is applied in the empirical analysis.
Tipo: Conference Paper or Presentation
Palavras-chave: GRP; Cluster; Classification; Mixed Effect Model; Wheat Yield; Crop Production/Industries; Financial Economics; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21637

LOCATION DECISIONS OF ENERGY-INTENSIVE MANUFACTURING FIRMS: ESTIMATING THE POTENTIAL IMPACT OF ELECTRIC UTILITIES DEREGULATION
Provedor de dados: 31
Autores: Goetz,   Stephan J.
Location decisions of electric energy-intensive manufacturing establishments are examined in the context of electric utilities deregulation, using Tobit and probit methods.  Rural counties which once had an advantage recruiting manufacturing industries by offering low electricity rates may lose firms to other regions of the country under deregulation.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1998
URL: http://purl.umn.edu/20951

CDSIMEQ: A program to implement two-stage probit least squares
Provedor de dados: 31
Autores: Keshk,   Omar M.G.
The cdsimeq command implements the two-stage probit least squares estimation method described in Maddala (1983) for simultaneous equations models in which one of the endogenous variables is continuous and the other endogenous variable is dichotomous. The cdsimeq command implements all the necessary procedures for obtaining consistent estimates for the coefficients, as well as their corrected standard errors.
Tipo: Journal Article
Palavras-chave: Simultaneous equations; Amemiya; Maddala; Continuous endogenous; Dichotomous endogenous; 2SPLS; 2SLS; Instruments; Standard errors; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116066

SEQUENTIAL REGRESSION: A FLEXIBLE TOOL FOR TIME SERIES MODELING
Provedor de dados: 31
Autores: Fackler,   Paul L.; King,   Robert P.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1984
URL: http://purl.umn.edu/13498

SUSTAINABLE RESOURCE MANAGEMENT: A METHODOLOGY FOR ANALYSIS
Provedor de dados: 31
Autores: Popp,   Jennie S. Hughes; Hoag,   Dana L.
Resource endowments, modeled as quality indices, are placed into a dynamic production model to determine resource use adjustments to meet sustainability and production input usage changes when resource quality fluctuates.  Impacts of sustainability are identified and the time path of resource quality is evaluated using substitution, reversibility and uncertainty criteria.
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1998
URL: http://purl.umn.edu/21008

Difference-based semiparametric estimation of partial linear regression models
Provedor de dados: 31
Autores: Lokshin,   Michael.
This article describes the plreg command, which implements the difference-based algorithm for fitting partial linear regression models.
Tipo: Journal Article
Palavras-chave: Plreg; Nonparametric regression; Difference-based estimator; Partial linear regression; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117587

International Evidence on Food Consumption Patterns:  An Update Using 2005 International Comparison Program Data
Provedor de dados: 31
Autores: Muhammad,   Andrew; Meade,   Birgit Gisela Saager.
In a 2003 report, International Evidence on Food Consumption Patterns, ERS economists estimated income and price elasticities of demand for broad consumption categories and food categories across 114 countries using 1996 International Comparison Program (ICP) data. This report updates that analysis with an estimated two-stage demand system across 144 countries using 2005 ICP data. Advances in ICP data collection since 1996 led to better results and more accurate income and price elasticity estimates. Low-income countries spend a greater portion of their budget on necessities, such as food, while richer countries spend a greater proportion of their income on luxuries, such as recreation. Low-value staples, such as cereals, account for a larger share of the...
Tipo: Technical Report
Palavras-chave: ICP 2005; High-value food products; Consumption patterns; Marginal share; Income elasticity; Price elasticity; ERS; USDA; Demand and Price Analysis; Food Security and Poverty; International Development; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/120252

Mata matters: Translating Fortran
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. In the Mata matters column, we show how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. In this column, we demonstrate how Fortran programs can be translated and incorporated into Stata.
Tipo: Journal Article
Palavras-chave: Mata; Fortran; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117531

PUBLIC PROJECTS EVALUATION, ENVIRONMENT, AND SEN'S THEORY; Proceedings of the Fifth Joint Conference on Agriculture, Food, and the Environment, June 17-18, 1996, Padova, Italy
Provedor de dados: 31
Autores: Casini,   Leonardo; Bernetti,   Iacopo.
The purpose of this paper is to present a methodology for analyzing public investment plans based on Sen's theory of capabilities.  Specifically, we will review the methodological and application problems involved in the use of Sen's theoretical framework for assessing the environmental and intergenerational impact of long-term public investments.
Tipo: Working or Discussion Paper
Palavras-chave: Public Economics; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/14407

A Comparison of Price Imputation Methods under Large Samples and Different Levels of Censoring.
Provedor de dados: 31
Autores: Lopez,   Jose Antonio.
Research paper
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer/Household Economics; Demand and Price Analysis; Research Methods/ Statistical Methods; Imputation methods; Multiple imputation; Censored prices; Protein demand; Elasticities.
Ano: 2011
URL: http://purl.umn.edu/104498

Production function estimation in Stata using the Olley and Pakes method
Provedor de dados: 31
Autores: Yasar,   Mahmut; Raciborski,   Rafal; Poi,   Brian P.
Productivity is often computed by approximating the weighted sum of the inputs from the estimation of the Cobb–Douglas production function. Such estimates, however, may suffer from simultaneity and selection biases. Olley and Pakes (1996, Econometrica 64: 1263–1297) introduced a semiparametric method that allows us to estimate the production function parameters consistently and thus obtain reliable productivity measures by controlling for such biases. This study first reviews this method and then introduces a Stata command to implement it. We show that when simultaneity and selection biases are not controlled for, the coefficients for the variable inputs are biased upward and the coefficients for the fixed inputs are biased downward.
Tipo: Article
Palavras-chave: Opreg; Levpet; Production function; Bias; Simultaneity; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122587

SEQUENTIAL ADOPTION OF SITE-SPECIFIC TECHNOLOGIES AND ITS IMPLICATIONS FOR NITROGEN PRODUCTIVITY: A DOUBLE SELECTIVITY MODEL
Provedor de dados: 31
Autores: Khanna,   Madhu.
This paper analyzes the sequential decision to adopt two site-specific technologies, soil testing and variable rate technology (VRT), and their impact on nitrogen productivity in four Midwestern states. The results indicate that while farm location was a key variable influencing the adoption of soil testing, human capital and innovativeness of farmers had a significant impact on the adoption of VRT. A double selectivity model applied to correct for sample selection bias shows that gains in nitrogen productivity due to the two adoption decisions are largest for farms with below average soil quality and statistically insignificant for farms with above average soil quality. These findings have implications for the targeting of public policies designed to...
Tipo: Conference Paper or Presentation
Palavras-chave: Site-specific crop management; Adoption; Bivariate probit; Sample selection; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21599

Mata Matters: Creating new variables—sounds boring, isn't
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. In the Mata Matters column, we show how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. In this quarter’s column, we continue to explore the handling of Stata datasets in Mata and focus on creating new variables.
Tipo: Journal Article
Palavras-chave: Mata; Views; Stata datasets; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117561

Forecasting in the Presence of Level Shifts
Provedor de dados: 31
Autores: Smith,   Aaron D.
This article addresses the problem of forecasting time series that are subject to level shifts. Processes with level shifts possess a nonlinear dependence structure. Using the stochastic permanent breaks (STOPBREAK) model, I model this nonlinearity in a direct and flexible way that avoids imposing a discrete regime structure. I apply this model to the rate of price inflation in the United States, which I show is subject to level shifts. These shifts significantly affect the accuracy of out-of-sample forecasts, causing models that assume covariance stationarity to be substantially biased. Models that do not assume covariance stationarity, such as the random walk, are unbiased but lack precision in periods without shifts. I show that the  STOPBREAK model...
Tipo: Working or Discussion Paper
Palavras-chave: Financial Economics; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/11985

THE CLUSTER-BASED DEVELOPMENT STRATEGY IN KAZAKHSTAN’S AGRO-FOOD SECTOR: A CRITICAL ASSESSMENT FROM AN "AUSTRIAN" PERSPECTIVE
Provedor de dados: 31
Autores: Wandel,   Jurgen.
This paper challenges the uselfullness of the cluster-based development strategy to diversify and increase the competitiveness of Kazakhstan’s economy, regarding the case of the country’s agro-food sector. For this it refers to insights of the Austrian Market Process Theory. It is argued that already the theoretical foundations of the cluster concept suffer from severe difficiencies, because it widely neglects the function of competition as a discovery procedure with alert entrepreuneurs as the driving force. Moreover, it ignores the knowledge requirements and limitations in a modern market economy for any outside third party to identify and promote successful industry structures. The closer examination of the implementation of the cluster development...
Tipo: Working or Discussion Paper
Palavras-chave: Cluster; Kazakhstan; Industrial policy; Institutional change; Cluster; Kasachstan; Industriepolitik; Institutioneller Wandel; Agribusiness; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; B 53; Q 13; L 22; L 52.
Ano: 2010
URL: http://purl.umn.edu/91760

Estimating the Demand for Wine Using Instrumental Variable Techniques
Provedor de dados: 31
Autores: Cuellar,   Steven; Huffman,   Ryan.
The demand for wine is generally estimated on an aggregate level as a single commodity. However, as recent history shows us, the demand for wine not only varies considerably by varietal, but also by price point within each varietal. As a result, although estimates of the demand for wine may be beneficial to the wine industry as a whole, they provide little benefit to individual wine producers. This paper seeks to overcome the limitations of prior research on the demand for wine by providing estimates for the demand for wine by varietal and price point. We also provide estimates of own price effects, income effects as well as cross price effects by color, varietal and price point. Problems of endogeneity inherent in demand estimation are corrected by...
Tipo: Working or Discussion Paper
Palavras-chave: Pooled Cross Section Time Series Data; Instrumental Variable Regression; Wine Demand; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/44085

Using density-distribution sunflower plots to explore bivariate relationships in dense data
Provedor de dados: 31
Autores: Dupont,   William D.; Plummer,   W. Dale, Jr.
Density-distribution sunflower plots are used to display high-density bivariate data. They are useful for data where a conventional scatterplot is difficult to read due to overstriking of the plot symbol. The x–y plane is subdivided into a lattice of small, regular, hexagonal bins. These bins are divided into low-, medium-, and high-density groups. In low-density bins, the individual observations are plotted as in a conventional scatterplot. Medium- and high-density bins contain light and dark sunflowers, respectively. In a light sunflower, each petal represents one observation. In a dark sunflower, each petal represents a specific number of observations. The user can control the sizes and colors of the sunflowers. By selecting appropriate colors and sizes...
Tipo: Journal Article
Palavras-chave: Scatterplot; Sunflower plot; Bivariate data; Density plot; Probability density function; Graphical statistics; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117526

MILK QUOTAS ABOLISHMENT AND SIMPLIFICATION OF THE SINGLE PAYMENT SCHEME: IMPLICATIONS ON DAIRY FARMERS’ PRODUCTIVE STRATEGY IN THE WEST OF FRANCE
Provedor de dados: 31
Autores: Lelyon,   Baptiste; Chatellier,   Vincent; Daniel,   Karine.
Paper removed at request of authors - 06/23/09.
Tipo: Conference Paper or Presentation
Palavras-chave: Dairy farm; CAP Health Check; Abolition of milk quotas; Price volatility; Bioeconomic model; Utility efficient programming; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q12; Q18; C61.
Ano: 2008
URL: http://purl.umn.edu/44795

Valuing the control of red imported fire ants in Australia using choice modelling
Provedor de dados: 31
Autores: Rolfe,   John; Windle,   Jill.
Invasive species create particular challenges for policy makers .Some deliberately introduced species contribute significantly to agricultural production and other purposes. However, many invasive weed and animal pests generate substantial costs through impacts on agricultural production, biodiversity, ecosystem services, infrastructure and communities.   An aggressive ant species, the red imported fire ant was introduced by accident to Australia. Infestations were found in Brisbane in February 2001. Modelling suggested that the pest could invade half of Australia within 35 years if it were not controlled.). Control of the fire ant has reduced the rate of new discoveries but the ant was still not eradicated by 2009.    The benefits of controlling red...
Tipo: Report
Palavras-chave: Invasive species; Red imported fire ants; Choice modelling experiments; Non-market valuation.; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94940

A Generalised Concept of Dominance in Linear Programming Models
Provedor de dados: 31
Autores: Drynan,   Ross G.
The notion of dominance most familiar to agricultural economists is perhaps the decision theoretic concept entailed in comparing one risky prospect to others. But dominance concepts are also relevant in the linear programming context, for example in identifying redundant constraints. In this note, the standard concept of dominance in linear programming is generalized by defining dominance with respect to differing levels of information about the programming problem.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/12358

Assessment of the Current Agricultural Data Base: An Information System Approach
Provedor de dados: 31
Autores: Bonnen,   James T.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/97517

External Validity of Hypothetical Surveys and Laboratory Experiments
Provedor de dados: 31
Autores: Chang,   Jae Bong; Lusk,   Jayson L.; Norwood,   F. Bailey.
We compare the ability of three preference elicitation methods (hypothetical choices, non-hypothetical choices, and non-hypothetical rankings) and three discrete-choice econometric models (the multinomial logit, the independent availability logit, and the random parameter logit) to predict actual retail shopping behavior in three different product categories (ground beef, wheat flour, and dishwashing liquid).  Overall, across all methods, we find a reasonably high level of external validity.  Our results suggest that the non-hypothetical elicitation approaches, especially the non-hypothetical ranking, outperformed the hypothetical choice experiment in predicting retail sales.  We also find that the random parameter logit can have superior predictive...
Tipo: Conference Paper or Presentation
Palavras-chave: Contingent valuation; Choice experiments; Experimental economics; External validity; Field experiment; Agribusiness; Consumer/Household Economics; Marketing; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43600

A tool for deterministic and probabilistic sensitivity analysis of epidemiologic studies
Provedor de dados: 31
Autores: Orsini,   Nicola; Bellocco,   Rino; Bottai,   Matteo; Wolk,   Alicja; Greenland,   Sander.
Classification errors, selection bias, and uncontrolled confounders are likely to be present in most epidemiologic studies, but the uncertainty introduced by these types of biases is seldom quantified. The authors present a simple yet easy-to-use Stata command to adjust the relative risk for exposure misclassification, selection bias, and an unmeasured confounder. This command implements both deterministic and probabilistic sensitivity analysis. It allows the user to specify a variety of probability distributions for the bias parameters, which are used to simulate distributions for the bias-adjusted exposure–disease relative risk. We illustrate the command by applying it to a case–control study of occupational resin exposure and lung-cancer deaths. By...
Tipo: Article
Palavras-chave: Episens; Episensi; Sensitivity analysis; Unmeasured confounder; Misclassification; Bias; Epidemiology; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120927

The Travel Cost Method: an empirical investigation of Randall's Difficulty
Provedor de dados: 31
Autores: Common,   Mick S.; Bull,   Tim; Stoeckl,   Natalie.
Randall (1994) argued that the Travel Cost Method (TCM) cannot generate monetary measures of recreation site benefits for use in Cost Benefit Analysis. Randall argues that what is relevant to recreational decision‐making is the subjective, and unobservable, price of travel, whereas TCM uses the observer‐assessed cost of travel. Hence, TCM can at best give ordinally measurable welfare estimates. ‘Randall’s Difficulty’ is formulated as an estimation problem and results are derived for that problem. The meaning of, prospects for, and usefulness of ordinal measurement are explored, and the existence of a solution to Randall’s Difficulty is considered.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/117209

Simulating Multivariate Distributions with Sparse Data: A Kernal Density Smoothing Procedure
Provedor de dados: 31
Autores: Lien,   Gudbrand D.; Hardaker,   J. Brian; Richardson,   James W.
Often analysts must conduct risk analysis based on a small number of observations. This paper describes and illustrates the use of a kernel density estimation procedure to smooth out irregularities in such a sparse data set for simulating univariate and multivariate probability distributions.
Tipo: Conference Paper or Presentation
Palavras-chave: Stochastic simulation; Smoothing; Multivariate kernel estimator; Parzen; Research Methods/ Statistical Methods; Q12; C8.
Ano: 2006
URL: http://purl.umn.edu/25449

CURRENT SMI RESEARCH PROGRAM
Provedor de dados: 31
Autores: Bishop,   Willard R., Jr.
Outlines on-going SMI Research.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/27688

Measuring Technical Efficiency of Dairy Farms with Imprecise Data: A Fuzzy Data Envelopment Analysis Approach
Provedor de dados: 31
Autores: Mugera,   Amin W.
This article integrates fuzzy set theory in Data Envelopment Analysis (DEA) framework to compute technical efficiency scores when input and output data are imprecise. The underlying assumption in convectional DEA is that inputs and outputs data are measured with precision.  However, production agriculture takes place in an uncertain environment and, in some situations, input and output data may be imprecise.  We present an approach of measuring efficiency when data is known to lie within specified intervals and empirically illustrate this approach using a group of 34 dairy producers in Pennsylvania.  Compared to the convectional DEA scores that are point estimates, the computed fuzzy efficiency scores allow the decision maker to trace the performance of a...
Tipo: Conference Paper or Presentation
Palavras-chave: Fuzzy set theory; Data Envelopment Analysis; Membership function; Α-cut level; Technical efficiency; Farm Management; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; Risk and Uncertainty; D24; Q12; C02; C44; C61.
Ano: 2011
URL: http://purl.umn.edu/103251

A NOTE ON SOME DIFFICULTIES IN RESPONSE ANALYSIS
Provedor de dados: 31
Autores: Anderson,   Jock R.
Some empirical problems which tend to receive inadequate attention in response analysis are discussed. These include the variation not explained by fitted production functions, the sensitivity of optima and profits to price changes, the cost of developing production functions and the value in using them.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1968
URL: http://purl.umn.edu/22695

Dollars or Cents: Impacts of Rescaling Data on a Mixed Logit Model with Normally and Lognormally Distributed Coefficients
Provedor de dados: 31
Autores: Hu,   Wuyang.
It is a common practice to rescale data to assist the model estimation process. This paper describes a case where care is called upon when interpreting the results after rescaling. The case is shown as associated with the lognormally distributed coefficient in a mixed logit model. Implications of rescaling data on a normally distributed coefficient are also given for comparison.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/24108

Rational Exaggeration in Information Aggregation Games
Provedor de dados: 31
Autores: Rausser,   Gordon C.; Simon,   Leo K.; Zhao,   Jinhua.
This paper studies a class of information aggregation models which we call “aggregation games.” It departs from the related literature in two main respects: information is aggregated by averaging rather than majority rule, and each player selects from a continuum of reports rather than making a binary choice. Each member of a group receives a private signal, then submits a report to the center, who makes a decision based on the average of these reports. The essence of an aggregation game is that heterogeneous players engage in a “tug-of-war,” as they attempt to manipulate the center’s decision process by mis-reporting their private information. When players have distinct biases, almost of them rationally exaggerate the extent of these biases. The degree of...
Tipo: Working or Discussion Paper
Palavras-chave: Information aggregation; Majority rule; Proportional representation; Mean versus median mechanism; Strategic communication; Incomplete information games; Strategic information transmission; Research Methods/ Statistical Methods; F71; D72; D82.
Ano: 2008
URL: http://purl.umn.edu/43976

Multivariable modeling with cubic regression splines: A principled approach
Provedor de dados: 31
Autores: Royston,   Patrick; Sauerbrei,   Willi.
Spline functions provide a useful and flexible basis for modeling relationships with continuous predictors. However, to limit instability and provide sensible regression models in the multivariable setting, a principled approach to model selection and function estimation is important. Here the multivariable fractional polynomials approach to model building is transferred to regression splines. The essential features are specifying a maximum acceptable complexity for each continuous function and applying a closed-test approach to each continuous predictor to simplify the model where possible. Important adjuncts are an initial choice of scale for continuous predictors (linear or logarithmic), which often helps one to generate realistic, parsimonious final...
Tipo: Article
Palavras-chave: Mvrs; Uvrs; Splinegen; Multivariable analysis; Continuous predictor; Regression spline; Model building; Goodness of fit; Choice of scale; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119254

An Analysis of Consumer Preferences for Information Sources on Food Safety by using Fuzzy Pair-wise Comparison
Provedor de dados: 31
Autores: Gunden,   Cihat; Miran,   Bulent; Uysal,   Ozlem Karahan; Kenanog,   Zerrin.
The main objective of this study is to measure consumer preferences for information sources on food safety along with the factors influencing the degree of consumer preferences in Turkey. The data were obtained from a survey of 385 consumers selected randomly in Izmir, Turkey. This study involves two-stage methodology. In the first stage, fuzzy pair-wise comparison was applied to calculate a measure of preferences. Five information sources on food safety, television programmes, doctors/experts, newspapers/journal articles, radio programmes and neighbors/friends were given to the consumers. The consumers were asked to make pair-wise comparisons among the information sources. The information source hierarchies of consumers were established and ranked from...
Tipo: Conference Paper or Presentation
Palavras-chave: Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6813

ON THE FRONTIER OF GENERATING REVEALED PREFERENCE CHOICE SETS: AN EFFICIENT APPROACH
Provedor de dados: 31
Autores: Scrogin,   David; Hofler,   Richard; Boyle,   Kevin J.; Milon,   J. Walter.
Deterministic rules for generating choice sets are often employed by analysts confronting universal sets with large numbers of alternatives.  For destination choice analysis, site exclusion rules defined by travel time, distance, or quality have a behavioral appeal, yet are fundamentally limited by their one-dimension scope.  To remedy this shortcoming while maintaining the concept that trips require costly inputs to yield utility generating outputs, we develop and test an exclusion rule for generating choice sets defined by efficiency measures derived from stochastic frontier econometric models.  Choice set composition, site choice efficiency and probability of selection, and consumer surplus are compared with results obtained under alternative exclusion...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20134

Investigation and Thoughts on the Farmers’ Specialized Cooperative Economic Organizations in Tropical Areas
Provedor de dados: 31
Autores: Wang,   Fang; Guo,   Jianchun.
Positive functions of farmers’ specialized cooperative economic organizations were emphasized, i.e. increasing farmers’ incomes, promoting the industrialization of agriculture, optimizing agricultural structure, enhancing the standardization of agricultural production and improving service means provided by government for agriculture. On the basis of investigating the current situation of farmers’ specialized cooperative economic organizations in tropical areas, the problems in the development process of these organizations were analyzed, which mainly included following aspects: ① Narrow coverage; ② Irregular and imperfect operation mechanism; ③ Insufficient effective policy support. Therefore, in view of these existing problems, the thoughts and...
Tipo: Thesis or Dissertation
Palavras-chave: Tropical areas; Farmers’ specialized cooperative economic organizations; Thoughts and countermeasures; China; Agricultural Finance; Community/Rural/Urban Development; Financial Economics; Industrial Organization; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/54027

Verbiage Matters: Do Respondents Answer Willingness to Pay Dichotomous Choice Questions on a Per Person or Per Group Basis?
Provedor de dados: 31
Autores: Lohman,   Greta; Keske,   Catherine M.; Loomis,   John B.
Dichotomous choice willingness to pay questions are often used to determine the value visitors place on nature-based recreation.  Ambiguity in wording can result in the use of information that does not necessarily reflect visitors’ true WTP.  For example, depending on the specificity of the verbiage used, respondents may answer questions on a group basis, rather than an individual basis.  To address this issue, experimental surveys were distributed with questions that specifically asked WTP on a per person basis, as compared to control surveys in which the WTP question was more generally worded.  Analyses show WTP responses for either survey type are statistically different, with non-overlapping confidence intervals.  Furthermore, approaches were conducted...
Tipo: Thesis or Dissertation
Palavras-chave: Dichotomous choice; Willingness to pay; Verbiage; Language; Wording; Group; Individual; Community/Rural/Urban Development; Demand and Price Analysis; Environmental Economics and Policy; Land Economics/Use; Public Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/60679

Data Availability for Carbon Calculators in Measuring GHG Emissions Produced by the Food Sector
Provedor de dados: 31
Autores: Amani,   Pegah; Schiefer,   Gerhard.
The continuing increase in burning fossil fuels over recent decades along with the changing land use have resulted in a considerable increase in the amount of greenhouse gases (GHGs) which can potentially lead to climate change. Adaptation processes will become necessary in order to cope with these challenges in the future. Despite individuals’ and institutions’ willingness to reduce the amount of GHG emissions caused by their actions or their “carbon footprints”, they may lack the knowledge to make effective choices. Carbon calculators have been developed to address these knowledge gaps by measuring and communicating the overall magnitude of the impacts and also the extent to which different behavior patterns contribute to GHG emissions. LCA databases, as...
Tipo: Article
Palavras-chave: GHG emission; Carbon calculator; LCA databases; Food chain; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/121956

An empirical research of the factors determining customer behaviour in food retail stores
Provedor de dados: 31
Autores: Lehota,   Jozsef; Horvath,   Agnes; Gyenge,   Balazs.
For years the Institute of Marketing at Szent István University has been conducting research in customer and consumer behaviour. This research project focuses on which food shops retail customers choose when it comes to traditional food. This paper briefly summarizes qualitative findings and offers a preliminary analysis of the project’s quantitative stage. Using six focus groups, the qualitative phase tried to identify factors that impact on how food retail shops were chosen. The goal was to pinpoint individual steps in the decision-making process. Shops selected for study were: hypermarkets, supermarkets, discount stores, small shops, markets, specialised stores and cash &amp; carry stores. Following this, using data from the qualitative results, a...
Tipo: Journal Article
Palavras-chave: Kelly’s repertory grid technique; Qualitative research; Quantitative research; Monroe &amp; Guiltinan’s store choice model; Donovan &amp; Rossiter’s store atmosphere model; Store characteristics; Segments of hypermarket patrons.; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/107650

IDENTIFYING CAUSAL RELATIONSHIPS BETWEEN NONSTATIONARY STOCHASTIC PROCESSES:  AN EXAMINATION OF ALTERNATIVE APPROACHES IN SMALL SAMPLES
Provedor de dados: 31
Autores: Zapata,   Hector O.; Hudson,   Michael A.; Garcia,   Philip.
A Monte Carlo investigation is used to examine the performance of two commonly used tests for Granger causality for univariate and bivariate nonstationary ARMA (p,q) processes. Tests are applied to raw data, first differences of the raw data, and detrended versions of the series. The results indicate that for independent series the tests are robust regardless of sample size. With bivariate series and nonstationarity, the tests results are sensitive to the ARMA specification, whether the data are filtered and the type of filter used, and the sample size.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/32108

Three Strikes and You're Out: Reply to Cooper and Willis
Provedor de dados: 31
Autores: Caballero,   Ricardo J.; Engel,   Eduardo M.R.A.
Cooper and Willis (2003) is the latest in a sequence of criticisms of our methodology for estimating aggregate nonlinearities when microeconomic adjustment is lumpy. Their case is based on “reproducing” our main findings using artificial data generated by a model where microeconomic agents face quadratic adjustment costs. That is, they supposedly find our results where they should not be found. The three claims on which they base their case are incorrect. Their mistakes range from misinterpreting their own simulation results to failing to understand the context in which our procedures should be applied. They also claim that our approach assumes that employment decisions depend on the gap between the target and current level of unemployment. This is...
Tipo: Working or Discussion Paper
Palavras-chave: Adjustment hazard; Aggregate nonlinearities; Lumpy adjustment; Observed and unobserved gaps; Quadratic adjustment; Research Methods/ Statistical Methods; E2; J2; J6.
Ano: 2004
URL: http://purl.umn.edu/28498

Linking Farmers to Markets through Modern Information and Communication Technologies in Kenya
Provedor de dados: 31
Autores: Mukhebi,   A.W.; Kundu,   J.; Okolla,   A.; Wambua,   M.; Ochieng,   W.; Fwamba,   G.
This paper highlights a market information and linkage system (MILS) developed and tested by the Kenya Agricultural Commodity Exchange Limited (KACE) that increases the efficiency of agricultural markets to work better for smallholder farmers and other small and medium sized agro-enterprises (SMEs). The MILS involves harnessing modern information and communication technologies (ICTs) to empower farmers with low-cost reliable and timely market information to enhance the bargaining power of the farmer for a better price in the market place, and to link the farmer to markets more efficiently and profitably. The components of the KACE MILS are (www.kacekenya.com): Rural based Market Information Points (MIPs) which are information kiosks located in rural...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Consumer/Household Economics; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Land Economics/Use; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/51988

Implications of Missing Data Imputation for Agricultural Household Surveys: An Application to Technology Adoption
Provedor de dados: 31
Autores: Gedikoglu,   Haluk; Parcell,   Joseph L.
Missing data is a problem that occurs frequently in survey data. Missing data results in biased estimates and reduced efficiency for regression estimates. The objective of the current study is to analyze the impact of missing-data imputation, using multiple-imputation methods, on regression estimates for agricultural household surveys. The current study also analyzes the impact of multiple-imputation on regression results, when all the variables in the regression have missing observations. Finally, the current study compares the impact of univariate multiple imputation with multivariate normal multiple imputation, when some of the missing variables have discrete distribution. The results of the current study show that multivariate-normal multiple...
Tipo: Presentation
Palavras-chave: Missing Data; Multiple Imputation; Bayesian Inference; Household Surveys; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/124333

The effect of information on consumer choice (the case of product with new properties)
Provedor de dados: 31
Autores: Fetisova,   Yulia.
In the modern world very concentrated informational environment forms consumer preferences well before a potential buyer goes to the shop to make purchases. The production of new commodities triggers economic agents’ demand for objective information necessary for taking decisions about their safety or further use. This study uses economic experiment to investigate the effect of information about the product with new properties on behavior of the Russian consumers and proves that new information can alter individual perceptions and evoke response. It turns out that women are more receptive to any information concerning food products. The results also emphasize discrepancy between actual participants’ behavior and their initial estimates made in...
Tipo: Working or Discussion Paper
Palavras-chave: Economic experiment; Effect of information; Product with new properties; Consumer behavior; Institutional and Behavioral Economics; Marketing; Research Methods/ Statistical Methods; D12; Q13.
Ano: 2009
URL: http://purl.umn.edu/51364

Riceflow: a Multi-region, Multi-product, Spatial Partial Equilibrium Model of the World Rice Economy
Provedor de dados: 31
Autores: Durand-Morat,   Alvaro; Wailes,   Eric J.
Tipo: Working or Discussion Paper
Palavras-chave: Rice; Spatial trade model; Bilateral trade; Policy; Agricultural and Food Policy; International Relations/Trade; Research Methods/ Statistical Methods; C02; C61; F11; F14; Q17; Q18.
Ano: 2010
URL: http://purl.umn.edu/92010

Export Diversification in Latin America and the Caribbean
Provedor de dados: 31
Autores: Taylor,   Timothy G.
Beginning in the mid-1980s the primary development paradigm pursued by Latin American and Caribbean countries undertook a major shift from the concept of import-substitution-industrialization (ISI) to that of export-led growth and openness to international markets. Despite these efforts, virtually no research has been undertaken to assess the degree to which the export structures of Latin American and Caribbean countries have in fact diversified.  This is unfortunate as the trade policy environment facing these countries is poised to undergo significant changes. The purpose of this paper is to examine the structure of exports to the U.S. from 19 selected Latin American and Caribbean countries over the 1989 to 2000 period in order to assess the degree to...
Tipo: Journal Article
Palavras-chave: Export diversification; Balassa Revealed Comparative Advantage; Agricultural and Food Policy; International Development; International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/36806

WHAT VALUE IS AGRICULTURAL ECONOMICS RESEARCH?
Provedor de dados: 31
Autores: Schimmelpfennig,   David E.; Norton,   George W.
Methods are presented for evaluating the economic benefits of agricultural economics research (AER). Decision theory and economic surplus analysis are used to evaluate returns to five representative types of AER. Benefits stem from effects of AER on economic efficiency through reduced uncertainty about optimal resource allocation or improved institutional design.
Tipo: Conference Paper or Presentation
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/21773

GRAFTED POLYNOMIALS AS APPROXIMATING FUNCTIONS
Provedor de dados: 31
Autores: Fuller,   Wayne A.
The use of segments of polynomials to approximate production surfaces and time-series trends is described and illustrated. These segmented curves are restricted to be continuous and have a continuous derivative(s) at the join points.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1969
URL: http://purl.umn.edu/22940

Dynamic Field Experiments in Development Economics: Risk Valuation in Morocco, Kenya, and Peru
Provedor de dados: 31
Autores: Lybbert,   Travis J.; Galarza,   Francisco B.; McPeak,   John G.; Barrett,   Christopher B.; Boucher,   Stephen R.; Carter,   Michael R.; Chantarat,   Sommarat; Fadlaoui,   Aziz; Mude,   Andrew G.
The effective design and implementation of interventions that reduce vulnerability and poverty require a solid understanding of underlying poverty dynamics and associated behavioral responses. Stochastic and dynamic benefit streams can make it difficult for the poor to learn the value of such interventions to them. We explore how dynamic field experiments can help (i) intended beneficiaries to learn and understand these complicated benefit streams, and (ii) researchers to better understand how the poor respond to risk when faced with nonlinear welfare dynamics. We discuss and analyze dynamic risk valuation experiments in Morocco, Peru, and Kenya.
Tipo: Journal Article
Palavras-chave: Poverty; Risk and uncertainty; Dynamics; Experiments; Kenya; Morocco; Peru; International Development; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/90791

Primal-Dual Estimation of a Linear Expenditure Demand System
Provedor de dados: 31
Autores: Paris,   Quirino; Perali,   Carlo Federico; Piccoli,   Luca.
Efficient estimates require the utilization of all the available theoretical and statistical information. This fact suggests that econometric models based on an explicit optimization theory might achieve more efficient estimates when all the primal and dual relations are used for a joint estimation of the model’s parameters. We present a discussion of this idea using a Linear Expenditure System (LES) of consumer demand. We assume that the risk-neutral household chooses its consumption plan on the basis of expected information. Some time after that decision, the econometrician attempts to measure quantities and prices and in so doing commits measurement errors. Hence, the econometric model is an errors-in-variables nonlinear system of equations for which...
Tipo: Working or Discussion Paper
Palavras-chave: Consumer demand functions; Primal-dual; Linear expenditure system; Demand and Price Analysis; Research Methods/ Statistical Methods; D0.
Ano: 2004
URL: http://purl.umn.edu/93741

Review of Sample Design for Zambia Post-harvest Survey (1997/98) and Recommendations for Improving the Sampling Strategy and Estimation Procedures
Provedor de dados: 31
Autores: Megill,   David J.
Following a review of the sample design for the 1997/98 Zambia Post-Harvest Survey  (PHS), described in the survey reports, summary results were tabulated from the survey data to  examine the distribution of the households for the different domains of analysis such as farm  size groups. Summary data were also examined for the different crops and animals. The purpose of  this report is to document the findings and recommendations from this review. Specific  recommendations are made on potential improvements to the sample design. This report also  includes the results of the CENVAR analyses, and specifies the procedures for weighting the data  and calculating the standard errors. A separate report on “Review of Questionnaire for  Post-Harvest Survey...
Tipo: Report
Palavras-chave: Food security; Food policy; Zambia; Crop Production/Industries; Research Methods/ Statistical Methods; Q18.
Ano: 2000
URL: http://purl.umn.edu/54457

APPLICATION OF EXPERIMENTATAL ECONOMICS CONCEPTS AND PRECEPTS TO CVM FIELD SURVEY PROCEDURES
Provedor de dados: 31
Autores: Bergstrom,   John C.; Stoll,   John R.
Experimental economics (EE) axioms are directly applied in this paper to contingent valuation method (CVM) field survey procedures.  The implications of EE concepts and precepts for conceptualizing and handling potential CVM biases and framing effects also are discussed.  It is concluded that EE concepts and precepts provide useful principles and guidelines for CVM field survey procedures.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/32451

MAD ABOUT BLUE: AN EMPIRICAL COMPARISON OF MINIMUM ABSOLUTE DEVIATIONS AND ORDINARY LEAST SQUARES ESTIMATES OF CONSUMER SURPLUS
Provedor de dados: 31
Autores: Bingham,   Matthew F.; MacNair,   Douglas J.; Dunford,   Richard W.
This research evaluates methods for estimating consumer surplus from recreation demand models.  MAD regression and MIMIC structural modeling are the primary tools employed.  The results from simulated and actual data indicate that MAD regression outperforms OLS.  Additionally, the analysis shows that well-defined, stable benefit-transfer functions can be developed.
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20828

The impact of property rates on agricultural land, focusing on the Northern Cape
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005.  This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58093

Managing water for the poor; Proceedings of the Regional Workshop on Pro-Poor Intervention Strategies in Irrigation Agriculture in Asia - Bangladesh, China, India, Indonesia, Pakistan and Vietnam, Colombo, 9-10 August 2001
Provedor de dados: 31
Tipo: Presentation
Palavras-chave: Water management; Irrigated farming; Surface irrigation; Large-scale systems; Poverty; Irrigation programs; Rural development; Participatory management; Conflict; Water users' associations; Farmer-agency interactions; Financing; Policy; Water rates; Pricing; Water scarcity; Rice; Irrigation scheduling; Water delivery; Case studies; Farm Management; Financial Economics; Food Security and Poverty; Public Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2002
URL: http://purl.umn.edu/118412

RISK MANAGEMENT THROUGH INSURANCE AND ENVIRONMENTAL EXTERNALITIES FROM AGRICULTURAL INPUT USE: AN ITALIAN CASE STUDY
Provedor de dados: 31
Autores: Capitanio,   Fabian.
The biological nature of agricultural production processes induce a higher degree of uncertainty surrounding the economic performance of farm enterprises. This has contributed to the development and acceptance of forms of public intervention aimed at reducing income variability that have no parallel in other sectors of the economy. In particular, subsidized crop insurance are a widely used tool. The impact of these programs on the decisions of production generates effects on input use, land use and thus, indirectly, environmental outcomes. The importance of this issue has grown in parallel with the growth in importance of the collective role of agriculture sector that has addressed the recent guidelines adopted by many developed countries. To examine the...
Tipo: Conference Paper or Presentation
Palavras-chave: Uncertainty; Risk Management; Crop Insurance; Input Use Decisions; Environmental Externalities; Mathematical Programming.; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods; Risk and Uncertainty; Q10; Q14.
Ano: 2008
URL: http://purl.umn.edu/44834

DISCUSSION: ECONOMIC RESEARCH TRADE-OFFS BETWEEN EQUITY AND EFFICIENCY
Provedor de dados: 31
Autores: Tweeten,   Luther G.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/30402

Programmable GLM: Two user-defined links
Provedor de dados: 31
Autores: Guan,   Weihua; Gutierrez,   Roberto G.
With the release of Stata 7, the glm command for fitting generalized linear models underwent a substantial overhaul. Stata 7 glm contains an expanded array of variance estimators, regression diagnostics, and other enhancements. The overhaul took place to coincide with the release of Hardin and Hilbe (2001). With the new glm came a modular design that enables users to program customized link functions, variance functions, and weight functions to be used if Newey-West covariance estimates are desired. Because cases requiring customized link functions are the more prevalent in the literature, only those are considered here. We give two examples where a nonstandard link function is required: the relative survival model of Hakulinen and Tenkanen (1987) and a...
Tipo: Journal Article
Palavras-chave: GLM; Survival analysis; Cox regression; Programming; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116023

A NONPARAMETRIC HYPOTHESIS TEST VIA THE BOOTSTRAP RESAMPLING
Provedor de dados: 31
Autores: Temel,   Tugrul T.
This paper adapts an already existing nonparametric hypothesis test to the bootstrap framework.  The test utilizes the nonparametric kernel regression method to estimate a measure of distance between the models stated under the null hypothesis.  The bootstraped version of the test allows to approximate errors involved in the asymptotic hypothesis test.
Tipo: Conference Paper or Presentation
Palavras-chave: Hypothesis test; The bootstrap; Nonparametric regression; Omitted variables; Research Methods/ Statistical Methods; C12; C14; C15.
Ano: 2001
URL: http://purl.umn.edu/20600

A REGIONAL ECONOMETRIC MODEL OF U.S. APPLE PRODUCTION
Provedor de dados: 31
Autores: Roosen,   Jutta.
A four-region econometric model of U.S. apple production and consumption is developed.  Technical progress has benefited growers in the Northwest the most, but prices there are much lower in comparison to other regions.  Estimated elasticities are used to estimate national and regional welfare impacts of pesticide cancellations.
Tipo: Conference Paper or Presentation
Palavras-chave: Apple; Econometrics; Regional; Three-stage least square; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21663

In the Long Run
Provedor de dados: 31
Autores: Fernandez-Cornejo,   Jorge.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/125224

A simple approach to fit the beta-binomial model
Provedor de dados: 31
Autores: Guimaraes,   Paulo de Freitas.
In this paper, I show how to estimate the parameters of the beta-binomial distribution and its multivariate generalization, the Dirichlet-multinomial distribution. This approach involves no additional programming, as it relies on an existing Stata command used for overdispersed count panel data. Including covariates to allow for regression models based in these distributions is straightforward.
Tipo: Journal Article
Palavras-chave: Overdispersion; Beta binomial; Dirichlet multinomial; Fixed-effects negative binomial; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117527

A menu-driven facility for complex sample size calculation in randomized controlled trials with a survival or a binary outcome
Provedor de dados: 31
Autores: Royston,   Patrick; Babiker,   Abdel.
We present a menu-driven Stata program for the calculation of sample size or power for complex clinical trials with a survival time or a binary outcome. The features supported include up to six treatment arms, an arbitrary time-to-event distribution, fixed or time-varying hazard ratios, unequal patient allocation, loss to follow-up, staggered patient entry, and crossover of patients from their allocated treatment to an alternative treatment. The computations of sample size and power are based on the logrank test and are done according to the asymptotic distribution of the logrank test statistic, adjusted appropriately for the design features.
Tipo: Journal Article
Palavras-chave: Randomized controlled trials; Survival analysis; Logrank test; Experimental design; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115958

North Dakota Economic-Demographic Assessment Model (NEDAM): Technical Description
Provedor de dados: 31
Autores: Leistritz,   F. Larry; Ransom-Nelson,   William; Rathge,   Richard W.; Coon,   Randal C.; Chase,   Robert A.; Hertsgaard,   Thor A.; Murdock,   Steven H.; Toman,   Norman E.; Sharma,   Rakesh; Yang,   Pai-Sung.
This report describes the logic, structure, data bases, and operational procedures of the North Dakota model.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/23341

On Economic Optimization: A Nontechnical Survey
Provedor de dados: 31
Autores: Day,   Richard H.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/95545

Trust, Contracting, and Adaptation in Agri‐Food Hybrid Structures
Provedor de dados: 31
Autores: Martino,   Gaetano.
The paper considers the relationship between trust and governance structure from a Transaction Cost Economics perspective. The role of trust in the coordinating decisions is variously conceptualized according to the theoretical view adopted by the scholars. The present study adopt the three‐level schema introduced by Williamson (1996) and suggest that determinants of trust may operate both at institutional and governance structure level. The analytical framework depicted maintains that trust may determine a reduction of ex post transaction cost in the adaptation of hybrid structure. As a consequence trust appears to be able to extend the range of existence of the hybrids. The empirical part of the study is dedicated to a case study which illustrates the...
Tipo: Journal Article
Palavras-chave: Hybrid; Conditional trust; Adaptation; Contractual relationship.; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Industrial Organization; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/101283

Private Responses to Public Incentives for Invasive Species Management
Provedor de dados: 31
Autores: Ranjan,   Ram; Evans,   Edward A.
In this paper the impact of public policies such as subsidies and taxation on invasive species management is explored in a Markov chain process framework. Private agents react to public incentives based upon their long term expected profits and have the option of taking measures such as abatement, monitoring and reporting.  Conditions for perverse incentives are derived.  The impact of sequencing of taxation and subsides on spread of risks is explored.  One key finding of this paper is that excessive regulation may sometimes exacerbate the invasive species problem
Tipo: Journal Article
Palavras-chave: Invasive Species; Markov process; Perverse Incentives; Taxation and Subsidies; Agricultural and Food Policy; Agricultural Finance; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/36802

The impact of an increase in wine industry exports on the South African economy, focusing on the Western Cape
Provedor de dados: 31
Autores: McDonald,   Scott; Punt,   Cecilia; Bhanisi,   Sipho.
A marketing strategy undertaken by role players in the wine industry is expected to lead to increases in South African wine exports. A multi-sector analysis, which takes into account the linkage effects in an economy, was conducted to estimate the impact of an increase in wine exports on the South African economy. The increase in wine exports will be the result of changed perceptions and hence increases in the export price faced by South African wine producers. Results of a 10% increase in the international wine price indicated an increase of 0.1% in gross domestic product (GDP). The general positive effect on the economy is reflected by the creation of 5 824 employment opportunities, of which 20% is in the Western Cape. Factor incomes shows varied...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Agriculture in International Trade; Agricultural and Food Policy; International Relations/Trade; Research Methods/ Statistical Methods; C68; Q17.
Ano: 2006
URL: http://purl.umn.edu/58210

Sampling Schemes for Policy Analyses Using Computer Simulation Experiments
Provedor de dados: 31
Autores: Carriquiry,   Alicia L.; Breidt,   F. Jay; Lakshminarayan,   P.G.
Evaluating the environmental and economic impacts of agricultural policies is not a simple task.  A systematic approach to evaluation would include the effect of policy-dependent factors (sue as tillage practices, crop rotations, and chemical use) as well as the effect of policy-independent covariates (such as weather, topography, and soil attributes) on response variables (such as amount of soil eroded or chemical leached into the groundwater).  For comparison purposes, the effects of these input combinations on the response variable would have to be assessed under competing policy scenarios.  Because the number of input combinations is high in most problems, and because policies to be evaluated are often not in use at the time of the study, practitioners...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/18460

USING MULTIVARIATE RANK SUM TESTS TO EVALUATE EFFECTIVENESS OF COMPUTER APPLICATIONS IN TEACHING BUSINESS STATISTICS
Provedor de dados: 31
Autores: Su,   Yeong-Tzay; Liang,   Chyi-Lyi (Kathleen).
Arguments about using computer facilities to classroom teaching have gained a lot of attention over time.  Using the computer facilities will be helpful to demonstrate real world applications, while poor data or inappropriate case studies might reduce the confidence in applying computer programs in classroom teaching.  In this article we examine the results of using computer facilities to teach Business statistics to a group of Management students sampled from Krannert School of Management, Purdue University.  This study shows that students are attracted to the interactive computer programs designed for the Business Statistics course, and students are more motivated to attend classes when using computer facilities are applied in teaching.  Furthermore,...
Tipo: Conference Paper or Presentation
Palavras-chave: Rank sum test; Multivariate analysis; Teaching evaluation; Computer applications; Business statistics; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 1999
URL: http://purl.umn.edu/21707

Clubes de convergência nos municipios mineiros: uma análise via modelo threshold
Provedor de dados: 31
Autores: Santos,   Ricardo Bruno Nascimento dos; Amorim,   Airton Lopes; Coronel,   Daniel Arruda; Braga,   Marcelo Jose.
This paper is makes an analysis of the process of convergence of income between the municipalities of the Minas Gerais (Brazil) in the period of 1980 to 2005, trying to identify the existence of clubs of convergence using a model threshold. Results indicated for the formation of four clubs of convergence, among them shows a process of convergence between the all clubs. Human capital proved to be significant in explaining the process of growth of the intermediate groups of municipalities richer. The results also indicated that the physical capital was significantly negative for explaining the process of economic growth of most rich clubs of convergence, demonstrating in this way, a negative role for public investment undertaken in the districts of the region.
Tipo: Working or Discussion Paper
Palavras-chave: Income Convergence; Threshold Effect; Minas Gerais (Brazil); Community/Rural/Urban Development; Research Methods/ Statistical Methods; R11.
Ano: 2010
URL: http://purl.umn.edu/114400

Auction Experiments and Simulations of Milk Quota Exchanges
Provedor de dados: 31
Autores: Brümmer,   Bernhard; Loy,   Jens-Peter; Requate,   Till.
Since 2000 Germany has a fairly unique market mechanism to trade milk quotas between dairy farms. The two major features are: (1) a quasi auctioning system that produces excess demands which are covered by state reserves free of charge and (2) a price band is used to exclude high price bids. For both features an experimental design is developed to study their impact in comparison to a regular seller’s sealed bid double auction. Results show that both treatments lead to significant misallocations. These are due the direct impact of regulations and due to an imperfect adjustment of bidding functions towards them. The major goal of the market design to reduce quota prices is reached, however, at significant trade losses.
Tipo: Conference Paper or Presentation
Palavras-chave: Double Auction; Experiment; Milk Quota; Germany; Institutional and Behavioral Economics; Research Methods/ Statistical Methods; L11; D44; Q13.
Ano: 2010
URL: http://purl.umn.edu/61304

Using Choice Experiments to value River and Estuary Health in Tasmania with Individual Preference Heterogeneity
Provedor de dados: 31
Autores: Kragt,   Marit Ellen; Bennett,   Jeffrey W.
Choice experiments (CE), also known as choice modelling (CM), are now used widely in environmental valuation in Australia. Many examples assess the trade-offs between river catchment management and socio-economic impacts. There is, however, limited information about the values of Australian estuaries and none of the existing valuation studies addresses catchment management changes in Tasmania.   The CE study described in this report aims to elicit community preferences for protecting the rivers and estuary of the George catchment in north-eastern Tasmania. Results from conditional and mixed logit models show that respondents are, on average, willing to pay between $2.47 and $4.46 for a one kilometre increase in native riverside vegetation, and between...
Tipo: Report
Palavras-chave: Choice experiments; Preference heterogeneity; Mixed Logit models; River health; Estuary health; Tasmania; Environmental valuation; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94816

What is the Value of Hazardous Weather Forecasts? Evidence from a Survey of Backcountry Skiers
Provedor de dados: 31
Autores: Alberini,   Anna; Rheinberger,   Christoph M.; Leiter,   Andrea M.; McCormick,   Charles A.; Mizrahi,   Andrew.
What is the value of hazardous weather warnings? To answer this question, we focus on the avalanche bulletin for Switzerland issued by the WSL Institute for Snow and Avalanche Research (SLF). We take a survey-based, non-market valuation approach to estimating the value of hypothetical improvements in avalanche forecasting. We focus on backcountry skiers because (i) safety is arguably the most important type of benefit associated with the avalanche bulletin, (ii) they voluntarily undertake risks, and (iii) they perceive themselves and are generally perceived by others as skilled in avoiding risks. The respondents’ willingness to pay (WTP) for the improved services ranges between CHF 42 to 46, implying a mean value of statistical life (VSL) of CHF 1.75...
Tipo: Working or Discussion Paper
Palavras-chave: Avalanche Risk; Mortality; Value of Hazardous Weather Forecasts; Contingent Valuation; Value of a Statistical Life; Research Methods/ Statistical Methods; D81; J17; Q26.
Ano: 2010
URL: http://purl.umn.edu/92712

ANALYZING THE IMPACT OF BEACH CLOSURES, INTERSITE SUBSTITUTION AND INTERTEMPORAL SUBSTITUTION VIA A MODEL OF ATTENDANCE AT FIVE ORANGE COUNTY BEACHES
Provedor de dados: 31
Autores: Busch,   Christopher B.; Hanemann,   W. Michael.
This paper explores the impact on beach attendance of beach closures and the intersite and intertemporal substitution that may follow beach closures. A model of beach attendance is developed that builds on a model constructed by Paul Ruud to support the State of California's claim to damages after the American Trader oil spill off the coast of Orange County, southern California. Newly gathered data on beach closures is combined with data on daily attendance from 1985-1993. Variables are constructed to test for intersite substitution (the shifting of beach recreation in space, i.e. from a closed beach to another beach) and intertemporal substitution (the shifting of demand for recreation at a particular beach over time). The method of non-linear least...
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/6865

DISCUSSANT'S COMMENTS FOR AMERICAN AGRICULTURAL ECONOMICS ASSOCIATION ANNUAL MEETING, SELECTED PAPERS SESSION SP-3R: "ECONOMETRIC METHODS IN DEMAND ANALYSIS"
Provedor de dados: 31
Autores: Huang,   Kuo S.
This session focuses on advanced econometric issues in demand estimation. Testing Aggregation Without Separability in Meat Demand: An Investigation of the Generalized Composite Commodity Theorem George Davis, Texas A&amp;M University. A New, More General Demand System: The Nested PIGLOG Julian Alston and James Chalfant, University of California-Davis; Nicholas Piggott, North Carolina State University. An Almost Ideal Demand System with Global Regularity Properties Anatolik Skripnichenko, University of Alberta; Kevin Chen.                                The Estimation of a Complete Demand System Using Censored Microdata: Cereal Demand in Ethiopia  Michigan State University.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/21004

Explaining Investment Decisions in the South African Biofuels Industry: A Game Theoretic Approach
Provedor de dados: 31
Autores: Funke,   Thomas; Klein,   Peter G.
The production of biofuels and the establishment of a biofuels industry in South Africa have largely been hampered by the structure, procedures and requirements as set out in the Industrial Biofuel Strategy. This article sketches the industry by means of a game theoretic representation. A model is developed that represents the rational strategies of various role players in the industry with respect to investor decision making. In reality this did not occur and the article develops and documents a variable, σ, which in turn helps to represent the current state of affairs. The study explains why current investment decisions in the industry have been made and why certain role players remain indifferent towards any commitment.
Tipo: Journal Article
Palavras-chave: Biofuels; Game Theory; Biofuel Industry Investments; Agricultural Finance; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/95978

Obesity in Urban Food Markets: Evidence from Geo-referenced Micro Data
Provedor de dados: 31
Autores: Chen,   Susan E.; Florax,   Raymond J.G.M.; Snyder,   Samantha D.
This paper provides quantitative estimates of the effect of proximity to fast food restaurants and grocery stores on obesity in urban food markets. Our empirical model combined georeferenced micro data on access to fast food restaurants and grocery stores with data about salient personal characteristics, individual behaviors, and neighborhood characteristics. We defined a "local food environment" for every individual utilizing 0.5-mile buffers around a person's home address. Local food landscapes are potentially endogenous due to spatial sorting of the population and food outlets, and the body mass index (BMI) values for individuals living close to each other are likely to be spatially correlated because of observed and unobserved individual and...
Tipo: Working or Discussion Paper
Palavras-chave: Obesity; Fast food; Grocery store; Spatial econometrics; Micro data; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Public Economics; Research Methods/ Statistical Methods; C31; D12; I12; I18.
Ano: 2009
URL: http://purl.umn.edu/49512

Analyzing Households’ Fruit Juice Consumption and Purchasing Tendency: A Case Study From Isparta
Provedor de dados: 31
Autores: Gul,   Mevlut; Akpinar,   Goksel; Dagistan,   Erdal; Yilmaz,   Hilal; Gulcan,   Sinem.
The investments of fruit juice industry had been begun in 1969 in Turkey and accelerated since 1983 in modern sense. 37 fruit juice firms are officially registered as trademark. The fruit juice consumption per head was increased in the beginning of 1970s by about 13 fold augmentation, however, this value is still considerably lower than the developed countries. Relatively high fresh fruit consumption is caused lower fruit juice consumption in Turkey. However, an increasing in the domestic demand of fruit juice is observed by the years. This study was carried out to determine the fruit juice consumption and the expenditure of the families in Isparta Province. Thus, this investigation was conducted in the centre of Isparta. In this means, purchasing...
Tipo: Presentation
Palavras-chave: Fruit Juice; Consumption; Expenditure Structure; Agribusiness; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121997

Meta Response Surface Design for General and Partial Equilibrium Models
Provedor de dados: 31
Autores: Hess,   Sebastian; von Cramon-Taubadel,   Stephan.
Due to the complexity of general and partial equilibrium models, conventional sensitivity analysis, qualitative reviews or literature-based meta-analyses do not allow for detailed assessments of the role of individual parameters and policy shocks across different models. Therefore, the partial equilibrium model “GSIM” and a single country CGE are employed to generate synthetic scenarios based on randomly specified combinations of base data, elasticities and tariff changes selected from previously specified, plausible ranges. The synthetic meta-data has the advantage that the values of explanatory variables are measured exactly. This makes it possible to explore complex issues of functional form and interaction between variables in the estimation of the...
Tipo: Conference Paper or Presentation
Palavras-chave: General Equilibrium; Partial Equilibrium; Response Surface Design; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43689

Stata tip 20: Generating histogram bin variables
Provedor de dados: 31
Autores: Harrison,   David A.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117520

Measuring assistance to the agricultural industry in Australia using a Production Assistance Index
Provedor de dados: 31
Autores: MacLaren,   Donald; Lloyd,   Peter J.
The history of the reforms of the assistance given to Australian agriculture over the past fifty years is a remarkable story, especially when contrasted with the experiences of most other OECD countries. The effects of these reforms have been captured by the Productivity Commission (and its predecessors) and by Lloyd through time series of the nominal rates of assistance to individual agricultural commodities and to the industry as a whole. In this paper the concept of a partial equilibrium production assistance index is developed to obtain a more accurate picture of the implicit welfare consequences of this assistance for the period 1955-59 to 2000-04. This index is a mean of order 2. It is shown that the conventional average, the mean of order 1,...
Tipo: Conference Paper or Presentation
Palavras-chave: Production Assistance Index; Industry assistance; Trade Restrictiveness Index; Australian agricultural policy; Research Methods/ Statistical Methods; Agricultural and Food Policy.
Ano: 2008
URL: http://purl.umn.edu/6033

Introduction to game-theory calculations
Provedor de dados: 31
Autores: Orsini,   Nicola; Rizzuto,   Debora; Nante,   Nicola.
Game theory can be defined as the study of mathematical models of conflict and cooperation between intelligent and rational decision makers (Myerson 1991). Game-theory concepts apply in economy, sociology, biology, and health care, and whenever the actions of several agents (individuals, groups, or any combination of these) are interdependent. We present a new command gamet to represent the extensive form (game tree) and the strategic form (payoff matrix) of a noncooperative game and to identify the solution of a nonzero and zero-sum game through dominant and dominated strategies, iterated elimination of dominated strategies, and Nash equilibrium in pure and fully mixed strategies. Further, gamet can identify the solution of a zero-sum game through maximin...
Tipo: Journal Article
Palavras-chave: Game theory; Nash equilibrium; Payoff matrix; Zero-sum game; Game tree; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117525

COMMUNITY-BUSINESS MATCHING: A NEW MODEL FOR RURAL ECONOMIC DEVELOPMENT
Provedor de dados: 31
Autores: Buescher,   Michael; Halbrendt,   Catherine K.; Sullivan,   Pauline; Zheng,   Yi.
Identifying target industry sectors for community economic development is a complex problem.  The Community-Business Matching (CBM) Model is a tool that assists in identifying desirable industry sectors for sustainable economic development. The framework of the model is based on two measures, "Desirability" and "Compatibility", between a community and industry sectors. A case study of two Vermont communities will be presented.
Tipo: Conference Paper or Presentation
Palavras-chave: Community Assets and Goals; Business Benefits and Needs; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21696

COMBINING REGRESSION AND FACTOR ANALYSIS FOR USE IN AGRICULTURAL ECONOMICS RESEARCH
Provedor de dados: 31
Autores: Scott,   John T., Jr.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1976
URL: http://purl.umn.edu/29751

Stata tip 49: Range frame plots
Provedor de dados: 31
Autores: Merryman,   Scott.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119287

Stata tip 67: J() now has greater replicating powers
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122608

Modelling Framework Requirements
Provedor de dados: 31
Autores: Rizzoli,   Andrea E.; Svensson,   Mats G.E.; Rowe,   Ed C.; Donatelli,   Marcello; Muetzelfeldt,   Robert; van der Wal,   Tamme; van Evert,   Frits K.; Villa,   Ferdinando.
Tipo: Report
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/9303

Analysis and optimization regarding the activity of a Hungarian Pig Sales and Purchase Cooperation
Provedor de dados: 31
Autores: Balogh,   Peter; Ertsey,   Imre; Fenyves,   Veronika; Nagy,   Lajos.
In many ways, the Hungarian pork chain faces considerable disadvantages when compared to the situation in competing countries. In countries endowed with a modern meat chain, heavy concentration is the rule, but in Hungary decentralization still prevails, although thankfully the chain is not disintegrating even further. In our research we used the operation of co-operatives as a model in terms of a generalized network problem. The model allows the quantification of the number of pigs from given farms to slaughterhouses, the maximum sales revenue, the delivery threshold prices, and an analysis of the impact co-operative members exert on sales revenues.
Tipo: Journal Article
Palavras-chave: Pork production; Integration; Network; Linear programming; Demand and Price Analysis; Farm Management; Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/49192

Closing the factory doors until better times: CGE modelling of drought using a theory of excess capacity
Provedor de dados: 31
Autores: Wittwer,   Glyn; Griffith,   Marnie.
The aim of this paper is to analyse the regional economic impacts of a prolonged period of recurrent droughts. The model used for analysis is TERM-H2O, a dynamic successor to the bottom-up, comparative static TERM (The Enormous Regional Model). We concentrate on the regions of the southern Murray-Darling basin. Large change simulations are a challenge for modellers. Drought brings substantial inward supply shifts for farm sectors. This paper outlines various theoretical modifications undertaken to improve the modelling of drought in a computable general equilibrium (CGE) framework and then applies them to the period from 2005–06 on. In particular, we apply a theory of sticky capital adjustment to downstream processing sectors, whereby processors...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/59263

Innovation behaviour at farm level: Selection and identification
Provedor de dados: 31
Autores: Sauer,   Johannes; Zilberman,   David.
Using a squential logit model and a mixed-effects logistic regression approach this empirical study investigates factors for the adoption of automatic milking technology (AMS) at the farm level accounting for problems of sequential sample selection and behaviour identification. The results suggest the importance of the farmer’s risk perception, significant effects of peer-group behaviour, and a positive impact of previous innovation experiences.
Tipo: Conference Paper or Presentation
Palavras-chave: Squential logit model; Automatic milking technology (AMS); Livestock Production/Industries; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53276

Review of The Workflow of Data Analysis Using Stata, by J. Scott Long
Provedor de dados: 31
Autores: Acock,   Alan C.
This article reviews The Workflow of Data Analysis Using Stata, by J. Scott Long.
Tipo: Article
Palavras-chave: Data analysis; Workflow; Data management; Wdaus; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122707

PATH-DEPENDENCE WITHOUT INCREASING RETURNS TO SCALE AND NETWORK EXTERNALITIES
Provedor de dados: 31
Autores: Balmann,   Alfons; Odening,   Martin; Weikard,   Hans-Peter; Brandes,   Wilhelm.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/13402

Price Discovery in Nebraska Cattle Markets
Provedor de dados: 31
Autores: Stockton,   Matthew C.; Bessler,   David A.; Wilson,   Roger K.
Monthly observations on prices from 10 weight/gender classifications of Nebraska beef cattle are studied in an error correction model (ECM) framework. This study attempts a replication of the 2003 paper on Texas prices by Bessler and Davis, where they find medium heifers (600–700 lb) at the center of price discovery. Using the ECM results Nebraska light steers are found to be weakly exogenous, with the innovation accounting results showing marked differences. Industry structure, production choices, and animal type and breeding herd differences between Texas and Nebraska are proposed as plausible reasons for partial (or incomplete) success at replication.
Tipo: Journal Article
Palavras-chave: Bernanke factorization; Cattle prices; Cointegration; Directed acyclical graphs; Error correction; PC algorithm; Price discovery; Agribusiness; Demand and Price Analysis; Industrial Organization; Livestock Production/Industries; Production Economics; Research Methods/ Statistical Methods; C49; Q13.
Ano: 2010
URL: http://purl.umn.edu/57149

Goodness-of-fit test for a logistic regression model fitted using survey sample data
Provedor de dados: 31
Autores: Archer,   Kellie J.; Lemeshow,   Stanley.
After a logistic regression model has been fitted, a global test of goodness of fit of the resulting model should be performed. A test that is commonly used to assess model fit is the Hosmer–Lemeshow test, which is available in Stata and most other statistical software programs. However, it is often of interest to fit a logistic regression model to sample survey data, such as data from the National Health Interview Survey or the National Health and Nutrition Examination Survey. Unfortunately, for such situations no goodness-of-fit testing procedures have been developed or implemented in available software. To address this problem, a Stata ado-command, svylogitgof, for estimating the F-adjusted mean residual test after svy: logit or svy: logistic estimation...
Tipo: Journal Article
Palavras-chave: Svylogitgof; Goodness of fit; Survey design; Svy; Logistic regression; Logit; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117559

A CLASS OF SEPARABILITY FLEXIBLE FUNCTIONAL FORMS
Provedor de dados: 31
Autores: Driscoll,   Paul J.; McGuirk,   Anya M.
Quadratic flexible forms, such as the translog and generalized Leontief, are separability inflexible. That is, separability restrictions render them inflexible with regard to separable structures. A class functional forms is proposed that is flexible with regard to general production structures and remains flexible regarding weakly separable structures when separability restrictions are imposed, thus permitting tests of the separability hypothesis. Additionally, the restricted forms are parsimonious; that is they contain the minimum number of parameters with which flexibility can be achieved.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/30947

A framework for assessing impacts of community-based enterprises on poverty reduction: a case study in northern Thailand
Provedor de dados: 31
Autores: Terrakul,   Nuttamon; Villano,   Renato A.; Wood,   Fiona; Mounter,   Stuart W.
Poverty alleviation remains a challenge for Thailand’s socio-economic development. A key strategy of the Thai government to help meet this challenge at the ‘grass roots’ level has been the promotion of Community-Based Enterprises (CBEs). And national statistics and descriptive studies have shown that CBEs have led to both income improvement and employment creation. However, poverty is a multi-dimensional concept and also some groups are more adversely affected (such a women) than others. By investigating poverty from a number of different angles, this research aims to assess whether CBES are a genuine tool for poverty reduction at the individual household level. This paper provides an outline of the framework developed for assessing CBE impact on poverty...
Tipo: Conference Paper or Presentation
Palavras-chave: Impact assessment; Community-based enterprise; Poverty reduction; Gender empowerment; Northern Thailand; International Development; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/59165

Declining Poverty in Latin America? A Critical Analysis of New Estimates by International Institutions
Provedor de dados: 31
Autores: Helwege,   Ann; Birch,   Melissa B.L.
Indicators of progress in overcoming poverty in Latin America have been heralded recently by international institutions. Yet a closer look at data from the World Bank and the United Nations reveals contradictions that are not easily resolved by reference to the underlying methodologies. This paper provides an introduction to how poverty is measured, what the data indicate about trends in poverty, and reasons to tread cautiously in interpreting it as evidence of progress or stagnation. While significant progress has been achieved in a few large countries, the poorest countries are still very poor, and some countries have even seen increases in their poverty rates despite economic growth.
Tipo: Working or Discussion Paper
Palavras-chave: Community/Rural/Urban Development; Food Security and Poverty; Health Economics and Policy; International Development; International Relations/Trade; Political Economy; Public Economics; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/37279

IPASS TECHNICAL MANUAL
Provedor de dados: 31
Autores: Olson,   Douglas C.; Maki,   Wilbur R.; Schallau,   Con H.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1985
URL: http://purl.umn.edu/13714

Choice of the Empirical Definition of Zero in the Translog Multiproduct Cost Functional Form
Provedor de dados: 31
Autores: N'Guessan,   Yapo G.; Featherstone,   Allen M.; Cader,   Hanas A.
This study examines the impacts of empirical definition of zero output values on price elasticities, economy of scope, and scale using the Translog cost function. A system of cost and factor share equations with regularity conditions imposed is estimated. Results show that the choice of default values affects policy recommendations.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/35369

CONCEPTUAL FRAMEWORK FOR ANALYSING STRUCTURAL CHANGE IN AGRICULTURE AND RURAL LIVELIHOODS
Provedor de dados: 31
Autores: Buchenrieder,   Gertrud; Mollers,   Judith; Happe,   Kathrin; Davidova,   Sophia; Fredriksson,   Lena; Bailey,   Alastair; Kancs,   d'Artis; Swinnen,   Johan F.M.; Vranken,   Liesbet; Hubbard,   Carmen; Ward,   Neil; Juvancic,   Luka; Milczarek,   Dominika; Plamen,   Mishev.
The Deliverable 2.1 (D2.1) of the SCARLED project provides the conceptual framework for analysing structural change in agriculture and rural livelihoods in the NMS and established Member States of the EU. It concisely summarizes the underlying theories and concepts of the pertinent research issues in SCARLED. SCARLED addresses a topic of wide interest with regard to the identification of past and future key social and agricultural restructuring processes for a living countryside in the NMS. Methodologically, the topic is approached by comparative, structured multi-country farm surveys complemented by an analysis of structural changes in the farm sectors of two selected regions with the agent-based simulation model AgriPoliS, taking special account of...
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/91737

QUALITY, REPUTATION, AND IMPORTS
Provedor de dados: 31
Autores: Worth,   Thomas.
This paper develops a model of how firms determine the quality of their output in a setting of asymmetric information.  In this framework, the few lowest-cost firms produce high quality output and the rest produce at low quality due to a free-rider problem.  The presence of imports exacerbates this problem.
Tipo: Conference Paper or Presentation
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21567

LASSEN SICH ERTRAGSRISIKEN IN DER LANDWIRTSCHAFT GLOBAL DIVERSIFIZIEREN?
Provedor de dados: 31
Autores: Liu,   Xiaoliang; Xu,   Wei; Odening,   Martin.
C2_1
Tipo: Conference Paper or Presentation
Palavras-chave: Ertragsrisiken; Copulas; Diversifikation; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93955

OPPORTUNITIES FOR INNOVATION THROUGH INTERDISCIPLINARY RESEARCH
Provedor de dados: 31
Autores: Florkowski,   Wojciech J.
The need for the multidisciplinary research collaboration results from the needs of modern economy. Cutting-edge-research is increasingly multidisciplinary and requires experts to bring disciplinary knowledge, but willing and able to share knowledge and experience in the search for comprehensive solutions. Individual efforts can become more efficient if the institutional structures promote unimpeded exchange of knowledge through informal and formal arrangements. Agricultural and applied economists can assume the leadership position in multidisciplinary research projects by identifying the researchable issue and guiding the search for solutions given preferences and attitudes of users. Universities that do not innovate and encourage multidisciplinary...
Tipo: Book
Palavras-chave: Multidisciplinary research collaboration; Institutional promotion; Attitudes of researchers; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43408

A STRUCTURAL-EQUATION GME ESTIMATOR
Provedor de dados: 31
Autores: Marsh,   Thomas L.; Mittelhammer,   Ronald C.; Cardell,   N. Scott.
A generalized maximum entropy estimator is developed for the linear simultaneous equations systems model.  We provide results on large and small sample properties of the estimator.  Empirical results illustrate efficiency advantages of the generalized maximum entropy estimator proposed in this study over traditional estimators (e.g., 2SLS and 3SLS).
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20890

Large Deviations Theory and Empirical Estimator Choice
Provedor de dados: 31
Autores: Grendar,   Marian; Judge,   George G.
Criterion choice is such a hard problem in information recovery and in estimation and inference. In the case of inverse problems with noise, can probabilistic laws provide a basis for empirical estimator choice? That is the problem we investigate in this paper. Large Deviations Theory is used to evaluate the choice of estimator in the case of two fundamental situations-problems in modelling data. The probabilistic laws developed demonstrate that each problem has a unique solution-empirical estimator. Whether other members of the empirical estimator family can be associated a particular problem and conditional limit theorem, is an open question.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/25084

Non-Constant Discounting in Continuous Time
Provedor de dados: 31
Autores: Karp,   Larry S.
This note derives the dynamic programming equation (DPE) to a differentiable Markov Perfect equilibrium in a problem with non-constant discounting and general functional forms. We begin with a discrete stage model and take the limit as the length of the stage goes to 0 to obtain the DPE corresponding to the continuous time problem. We characterize the multiplicity of equilibria under non-constant discounting and discuss the relation between a given equilibrium of that model and the unique equilibrium of a related problem with constant discounting. We calculate the bounds of the set of candidate steady states and we Pareto rank the equilibria.
Tipo: Working or Discussion Paper
Palavras-chave: Hyperbolic discounting; Time consistency; Markov equilibria; Non-uniqueness; Observational equivalence; Pareto efficiency; Research Methods/ Statistical Methods; D83; L50.
Ano: 2004
URL: http://purl.umn.edu/25050

Incorporating Spatial Grain Price Information in Marketing Plans: An Excel-based Spreadsheet Program
Provedor de dados: 31
Autores: Nefstead,   Ward E.
This paper explores the process of integrating spatial price information in planning tools such as marketing plans. An Excel spreadsheet is shown as an example and integrated with spatial software from ESRI to produce a spatially optimized marketing solutions. Examples from a farm in southwestern Minnesota are used.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21186

Copula-Based Nonlinear Models of Spatial Market Linkages
Provedor de dados: 31
Autores: Goodwin,   Barry K.; Holt,   Matthew T.; Onel,   Gulcan; Prestemon,   Jeffrey P.
Replaced with revised version of paper 06/28/11.
Tipo: Conference Paper or Presentation
Palavras-chave: Spatial Market Linkages; Copula Models; State-dependence; Forest Products; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103715

Empowerment of farmer organizations: case study of Farmer Managed Irrigated Agriculture Project, Sindh.
Provedor de dados: 31
Autores: Murray-Rust,   Hammond; Memon,   Yameen; Talpur,   Mustafa.
Tipo: Working or Discussion Paper
Palavras-chave: Farmer managed irrigation systems; Farmers' associations; Irrigation programs; Case studies; Irrigation management; Water management; Irrigated farming; Farmer participation; Legal aspects; Institution building; Farm Management; Institutional and Behavioral Economics; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2001
URL: http://purl.umn.edu/92779

GAMS CODE FOR ESTIMATING A SOCIAL ACCOUNTING MATRIX (SAM) USING CROSS ENTROPY (CE) METHODS
Provedor de dados: 31
Autores: Robinson,   Sherman; El-Said,   Moataz.
This paper documents the computer code implementing the CE-SAM estimation technique in GAMS (General Algebraic Modeling System). It defines the estimation problem in a deterministic setting; extends the approach to include a stochastic treatment of errors in control totals; summarizes the equations describing CE technique for estimating a consistent SAM starting from an inconsistent data set estimated with error; and provides the GAMS code.
Tipo: Working or Discussion Paper
Palavras-chave: Entropy; Cross entropy; Social accounting matrices; SAM; GAMS; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/16293

Using Surveys Effectively: What are Impact Surveys?
Provedor de dados: 31
Impact assessment surveys are questionnaire-based surveys that allow microfinance institutions (MFIs) to produce statistically valid information on the changes occurring in the lives of their clients and to assess whether these changes can be associated with their participation in the programme.
Tipo: Report
Palavras-chave: Financial Economics; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/23736

Estimating input allocation for farm supply models
Provedor de dados: 31
Autores: Gocht,   Alexander.
When building an economic model for supply analysis the aim is to model a decision making process of one or more agents which fits the observed practice as good as possible. Hereby the modeller is often confronted with incomplete information about the production process; particular crop specific input data are rarely available. The problem of defining activity related technology inputs coefficients is not new. A good deal of literature comes from the mathematical programming perspective, where input coefficients were estimated using a standard linear regression function to fully represent the mathematical program. However this approach is a pure technical device and may result in an inconsistent model. The author of the paper wants to investigate whether...
Tipo: Conference Paper or Presentation
Palavras-chave: Farm supply model; Input allocation; Entropy; HDP; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6469

Estimation of nonstationary heterogeneous panels
Provedor de dados: 31
Autores: Blackburne,   Edward F. III; Frank,   Mark W.
We introduce a new Stata command, xtpmg, for estimating nonstationary heterogeneous panels in which the number of groups and number of time-series observations are both large. Based on recent advances in the nonstationary panel literature, xtpmg provides three alternative estimators: a traditional fixed-effects estimator, the mean-group estimator of Pesaran and Smith (Estimating long-run relationships from dynamic heterogeneous panels, Journal of Econometrics 68: 79–113), and the pooled mean-group estimator of Pesaran, Shin, and Smith (Estimating long-run relationships in dynamic heterogeneous panels, DAE Working Papers Amalgamated Series 9721; Pooled mean group estimation of dynamic heterogeneous panels, Journal of the American Statistical Association 94:...
Tipo: Article
Palavras-chave: Xtpmg; Nonstationary panels; Heterogeneous dynamic panels; Pooled mean-group estimator; Mean-group estimator; Panel cointegration; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119268

Testing Welfare Measurement Gains of Combining Stated and Revealed Preferences Methods Using Count Data Models
Provedor de dados: 31
Autores: Gonzalez,   Juan Marcos; Loomis,   John B.; Gonzalez-Caban,   Armando.
This research updates the joint estimation of revealed and stated preference data of Cameron (1992) to allow for joint estimation of the Travel Cost Method (TCM) portion using count data models. Further these count data models reflect correction for truncation and endogenous stratification associated with commonly used on-site recreation sampling. Our updated modeling framework also allows for testing of consistency of behavior between revealed and stated preference data rather than imposing it. Our empirical example is river recreation visitors to the Caribbean National Forest in Puerto Rico. For this data set we find consistency between revealed preference and stated preference data. We also find little gain in estimation efficiency in our data. This may...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21203

The Effects of a Provision Rule in Choice Modelling
Provedor de dados: 31
Autores: Mazur,   Kasia; Bennett,   Jeffrey W.
This research report investigates the effects of including a provision rule in choice modelling non-market valuation studies. Split samples with and without a provision rule were used to test for differences in household willingness-to-pay for improvements in environmental quality in the Hawkesbury-Nepean catchment. Local/rural and distant/urban sub-samples of residents were selected.   The results of the study show that the inclusion of a provision rule had an effect on preferences in the distant/urban communities; however, the impact of a provision rule in the local/rural community sub-samples was negligible.
Tipo: Report
Palavras-chave: Choice modelling; Incentive comparability; Provision rule; Non-market valuation; Environment; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/94945

A new framework for managing and analyzing multiply imputed data in Stata
Provedor de dados: 31
Autores: Carlin,   John B.; Galati,   John C.; Royston,   Patrick.
A new set of tools is described for performing analyses of an ensemble of datasets that includes multiple copies of the original data with imputations of missing values, as required for the method of multiple imputation. The tools replace those originally developed by the authors. They are based on a simple data management paradigm in which the imputed datasets are all stored along with the original data in a single dataset with a vertically stacked format, as proposed by Royston in his ice and micombine commands. Stacking into a single dataset simplifies the management of the imputed datasets compared with storing them individually. Analysis and manipulation of the stacked datasets is performed with a new prefix command, mim, which can accommodate data...
Tipo: Article
Palavras-chave: Mim; Mimstack; Ice; Micombine; Miset; Mifit; Multiple imputation; Missing data; Missing at random; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120928

Durabilité des systèmes de production des petits ruminants: Une approche de santé  animale–marketing
Provedor de dados: 31
Autores: Lokman,   Zaibet.
L’objectif de ce papier est d’identifier les contraintes de commercialisation des petits ruminants sur le marché aux bestiaux.  Ces contraintes sont particulièrement prononcées chez les petits éleveurs. Notre recherche met en évidence la relation entre les caractéristiques de cette catégorie d’éleveurs et le choix du lieu de commercialisation (marché, sur la route ou à la ferme).  Ce choix est lié aussi aux coûts de transaction qui se manifestent sur le marché mais aussi à l’état de santé du cheptel.  La décision de ne pas se rendre sur le marché est supposée influencer négativement la continuité de cette activité et par conséquent la durabilité de d’élevage chez les petits éleveurs. Parmi les facteurs trouvés favoriser la chance de se rendre sur le marché...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Environmental Economics and Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Health Economics and Policy; Livestock Production/Industries; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/52099

Review of A Handbook of Statistical Analyses Using Stata by Rabe-Hesketh and Everitt
Provedor de dados: 31
Autores: Winter,   Nicholas J.G.
This article reviews A Handbook of Statistical Analyses Using Stata by Rabe-Hesketh and Everitt.
Tipo: Journal Article
Palavras-chave: Introductory; Gllamm; Stata texts; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116253

FOREWORD: Special Issue on Experimental Methods in Environmental, Natural Resource, and Agricultural Economics
Provedor de dados: 31
Autores: Messer,   Kent D.; Murphy,   James J.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Environmental Economics and Policy; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/90838

The information theoretic foundations of a probabilistic and predictive micro and macro economics
Provedor de dados: 31
Autores: Judge,   George G.
Despite the productive efforts of economists, the disequilibrium nature of the economic system and imprecise predictions persist. One reason for this outcome is that traditional econometric models and estimation and inference methods cannot provide the necessary quantitative information for the causal influence-dynamic micro and macro questions we need to ask given the noisy indirect effects data we use. To  move economics in the direction of a probabilistic and causal based predictive science, in this paper information theoretic estimation and inference methods are suggested as a basis for  understanding and making predictions about dynamic micro and macro economic processes and systems.
Tipo: Working Paper
Palavras-chave: Information theoretic methods; State space models; First order Markov processes; Inverse problems; Dynamic economic systems; Research Methods/ Statistical Methods; C40; C51.
Ano: 2012
URL: http://purl.umn.edu/122890

International Pork Trade and Foot-and-Mouth Disease
Provedor de dados: 31
Autores: Yang,   Shang-Ho; Reed,   Michael R.; Saghaian,   Sayed H.
International pork trade has not only been influenced by trade agreements but also altered by consumer perceptions on disease-infected animals. This study uses a gravity model with fixed-effects to investigate how pork trade is affected by foot-and-mouth disease among 186 countries. Results confirm that pork export falls when an exporting country develops FMD. Exporters with a vaccination policy have larger negative impacts than those with a slaughter policy. Further, pork importers that develop FMD and institute a slaughter policy will import more pork, but importers with a vaccination policy import the same level of pork. In order to retain a position as a top pork exporter, a slaughter policy is often a better choice than a vaccination policy.
Tipo: Presentation
Palavras-chave: Foot-and-mouth disease; Pork exports; Regional trade agreement; Gravity model; Zero-valued trade.; Food Consumption/Nutrition/Food Safety; International Relations/Trade; Research Methods/ Statistical Methods; C52; Q17; Q18.
Ano: 2012
URL: http://purl.umn.edu/124356

MORE REALISTIC SINGLE EQUATION MODELS THROUGH SPECIFICATION OF RANDOM COEFFICIENTS
Provedor de dados: 31
Autores: Langham,   Max R.; Mara,   Michael.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/30415

Multiple imputation of missing values: update
Provedor de dados: 31
Autores: Royston,   Patrick.
This article describes a substantial update to mvis, which brings it more closely in line with the feature set of S. van Buuren and C. G. M. Oudshoorn’s implementation of the MICE system in R and S-PLUS (for details, see http://www.multiple-imputation.com). To make a clear distinction from mvis, the principal program of the new Stata release is called ice. I will give details of how to use the new features and a practical illustrative example using real data. All the facilities of mvis are retained by ice. Some improvements to micombine for computing estimates from multiply imputed datasets are also described.
Tipo: Journal Article
Palavras-chave: Ice; Mvis; Uvis; Micombine; Mijoin; Misplit; Missing data; Missing at random; Multiple imputation; Multivariate imputation; Regression modeling; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117511

Geographic Distribution of Renewable Energy Sector Industries: An Analysis Using Recent Developments in Industry Concentration Measurement
Provedor de dados: 31
Autores: Register,   D. Lane; Lambert,   Dayton M.; English,   Burton C.; Jensen,   Kimberly L.; Menard,   R. Jamey; Wilcox,   Michael D.
Recent developments in firm location analysis are applied to explore the concentration patterns of firms making up the green energy sectors in 2002 and 2006. A two-step procedure is applied in this analysis. First, Guimarães, Figueiredo, and Woodward’s spatial adaption of Ellison and Glaeser’s industry concentration index are applied to estimate the degree to which firms making up the so-called green energy sectors tend to exhibit concentration. In the second stage, the spatial distribution of concentration is analyzed using a statistical framework, also suggested by Guimarães, Figueiredo, and Woodward. Preliminary results suggest that green energy subsectors exhibit significant global concentration, but localized concentration appears to be random.
Tipo: Presentation
Palavras-chave: Global; Local; Industry concentration measures; Green energy sectors; Community/Rural/Urban Development; Research Methods/ Statistical Methods; C21; L20.
Ano: 2012
URL: http://purl.umn.edu/124038

Groundwater Management and the Cost of Reduced Surface Water Deliveries to Urban Areas: The Case of the Central and West Coast Basins of Southern California
Provedor de dados: 31
Autores: Sunding,   David L.; Hamilton,   Stephen F.; Ajami,   Newsha K.
The Central and West Coast groundwater basins (“basins” or “Central and West Coast Basins”) are located in southern Los Angeles County. Groundwater produced from these basins provides approximately forty percent of the water supply for residents and businesses in all or parts of 43 cities. The 4 million residents in the area comprise more than ten percent of the total population of the State of California.  This report measures the economic costs and benefits of the various program elements encompassed by the proposed judgment amendments (Judgment Amendments) to pumpers extracting groundwater in the basins. Because those pumpers include water agencies, who collectively serve nearly 4 million customers the economic costs and benefits also extend to the...
Tipo: Working or Discussion Paper
Palavras-chave: Groundwater; Water supply; Water costs; Water demand; Water policy; Demand and Price Analysis; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/51596

Is there Need for more Transparency and Efficiency in Cause‐related Marketing
Provedor de dados: 31
Autores: Langen,   Nina; Grebitus,   Carola; Hartmann,   Monika.
“Growing awareness among consumers about sustainability issues ‐ ranging from recycling to fair wages for workers ‐ are starting to shape consumer buying patterns” (Partos 2009). Especially for conscious consumers ethical and sustainable consumption are becoming mainstream. With regard to ethical consumption the popularity is shown for instance by a growing relevance of Causerelated Marketing (CrM) campaigns in Germany. CrM is an increasingly applied marketing tool, where product purchase leads to target‐oriented donations regarding a designated cause – promoted on the product by label. However, research reveals that German consumers are sceptic with regard to the amount of money spent and have doubts towards unselfish motives of firms. At present little...
Tipo: Conference Paper or Presentation
Palavras-chave: Cause‐related Marketing; Donations efficiency; Transparent labelling; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Marketing; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100467

Regional Supply Capacity of Agricultural Products in Shandong Province Based on GIS
Provedor de dados: 31
Autores: Yang,   Liping; Guo,   Honghai; Yao,   Huimin; Sun,   Xiaoqing; Yang,   Ping; Wang,   Yong; Zhang,   Weizhan.
The authors select six indices of resource endowment, supply scale and structure of agricultural products in assessment area of China, and then use Factor Analysis Method and Geographic Information System (GIS) technology to classify the supply capacity of agricultural products in 140 counties and cities of Shandong Province. The authors also made a comprehensive quantitative and locational evaluation. Based on this, the authors put forward some suggestions on how to improve the supply capacity of agricultural products in Shandong Province of China.
Tipo: Thesis or Dissertation
Palavras-chave: Supply capacity of agricultural products; Factor Analysis Method; GIS; Shandong Province of China; Agricultural and Food Policy; Crop Production/Industries; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53599

Rural Economic and Social Statistics
Provedor de dados: 31
Autores: Bryant,   W. Keith.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/97586

Incentive Compatible Mechanism Design for Discrete Choice Surveys
Provedor de dados: 31
Autores: Das,   Chhandita; Anderson,   Christopher M.; Swallow,   Stephen K.
Paper removed by author 02/04/09.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21327

Meta-analysis with missing data
Provedor de dados: 31
Autores: White,   Ian R.; Higgins,   Julian P.T.
A new command, metamiss, performs meta-analysis with binary outcomes when some or all studies have missing data. Missing values can be imputed as successes, as failures, according to observed event rates, or by a combination of these according to reported reasons for the data being missing. Alternatively, the user can specify the value of, or a prior distribution for, the informative missingness odds ratio.
Tipo: Article
Palavras-chave: Metamiss; Meta-analysis; Missing data; Informative missingness odds ratio; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122700

Structural Agricultural Land Use Modelling
Provedor de dados: 31
Autores: Fezzi,   Carlo; Bateman,   Ian J.
This paper develops a structural econometric model of agricultural land use and production based on the joint multi-output technology representation introduced by Chambers and Just (1989). Starting from a flexible specification of the farm profit function we derive land use allocation, input applications, crops yield and livestock number equations in a joint and theoretically consistent framework. We present an empirical application using fine-scale spatial data covering the entirety of England and Wales and including the main economic, policy and environmental drivers of land use change in the past 40 years. To account for the presence of censored observations in this micro-level data we estimate the model as a system of two-limits Tobit equations via...
Tipo: Conference Paper or Presentation
Palavras-chave: Land Use; Structural Econometric Modelling; Agro-Environmental Policy; System of Censored Equations; Multivariate Tobit; Quasi-Maximum Likelihood.; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Q15; Q53; C34.
Ano: 2009
URL: http://purl.umn.edu/51423

Review of Data Analysis Using Stata by Kohler and Kreuter
Provedor de dados: 31
Autores: Schumm,   L. Philip.
This article reviews Data Analysis Using Stata by Kohler and Kreuter.
Tipo: Journal Article
Palavras-chave: Data analysis; Introductory; Teaching; GSOEP; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117549

Empirical Analysis on Fixed Assets Investment and Income of Rural Household
Provedor de dados: 31
Autores: Zhang,   Lin.
The related literatures were reviewed. According to the data in 1984-2005, the long-run equilibrium relation and causality of household income and fixed assets investment in China were studied empirically. The results showed that the restrictions of income growth on fixed assets investment of household were serious, but fixed assets investment was not the cause of household income growth. Finally, some policy proposals were put forward.
Tipo: Thesis or Dissertation
Palavras-chave: Farmers; China; Fixed assets investment; Income; Co-integration theory; Agricultural Finance; Financial Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53516

Probabilities of Success for Netherlands Dairy Farmers Moving Operations to the U.S.
Provedor de dados: 31
Autores: Duncan,   Anthony; Richardson,   James W.; Schwart,   Robert B., Jr.
The probability of success for an immigrating Dutch dairy farmer was analyzed using a whole farm simulation model.  Data used to simulate the U.S. farms came from the AFPC’'s database of representative U.S. dairies and projected mean annual prices from FAPRI.  Data on the Dutch dairy used for analysis came from Department of Agriculture, Nature, and Food Safety, the Agricultural Economics Institute, and research from Wageningen University in the Netherlands.  Results indicate that Dutch dairy farmers with adequate equity are better off financially immigrating to the U.S., rather than staying in the Netherlands.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20302

A nova economia institucional e sua aplicação no estudo do agronegócio brasileiro
Provedor de dados: 31
Autores: Mendes,   Krisley; Figueiredo,   Jeovan de Carvalho; Michels,   Ido Luiz.
This paper presents the theoretical roots from which emerges the New Institutional Economics (NIS). It shows that the NIS, in discussion with other branches institutionalists, reveals important theoretical limitations and contradictions. The lack of that rescue in studies on agribusiness prevents the observation of important issues of the Brazilian agribusiness, such as conflict, power and culture in the formation of structures of governance. The paper presents, first, the link between the understanding agribusiness in its systemic form and the institutionalist thought. Then, recovers the sources and branches of Institutional Economics, and shows that NIS is linked to the methodological individualism, which differs from the original institutionalism. It is...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Institutionalism; New Institutional Economics; Supply chains.
Ano: 2008
URL: http://purl.umn.edu/53852

AN APPLIED PROCEDURE FOR ESTIMATING AND SIMULATING MULTIVARIATE EMPIRICAL (MVE) PROBABILITY DISTRIBUTIONS IN FARM-LEVEL RISK ASSESSMENT AND POLICY ANALYSIS
Provedor de dados: 31
Autores: Richardson,   James W.; Klose,   Steven L.; Gray,   Allan W.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/15490

A CGE Analysis of the Harbinson Proposal: Outcomes for the EU25
Provedor de dados: 31
Autores: Philippidis,   George; Hubbard,   Lionel J.; Renwick,   Alan W.
In this study, we employ the Harbinson proposal and July Framework to compare a ‘likely’ Doha scenario with an ‘inclusive’ baseline. The key aim is to assess the impacts across EU member states. More specifically, we (i) employ the latest version 6 of the GTAP database, (ii) explicitly model CAP mechanisms (e.g., quotas, decoupled payments, set-aside, CAP budget etc.) to more accurately assess the asymmetric trade led welfare effects on selected EU member states, and (iii) introduce binding overhangs into domestic support, export subsidies and more importantly market access commitments. Whilst the EU regions benefit from the multilateral reform proposals, the gains are weakened considerably by the tariff binding overhangs, where the EU25 only gain ten per...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/45992

Quick Guide To Quattro Pro for Windows: For Mouse Users
Provedor de dados: 31
Autores: DeLano,   Daniel R.; Williams,   Jeffery R.; Schurle,   Bryan W.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/118141

Predicament and development of agricultural insurance in China
Provedor de dados: 31
Autores: Tian,   Ai-jun.
Starting from the predicament for agricultural insurance development in China, we use the principle of economics and game theory to analyze the causation of the difficulty in developing agricultural insurance based on apprehending the connotation of agricultural insurance. And related countermeasures and suggestions on how to get through difficult situation and revitalize agricultural insurance are put forward.
Tipo: Thesis or Dissertation
Palavras-chave: Agricultural insurance; Shrinking; Innovation; China; Agricultural Finance; Financial Economics; Labor and Human Capital; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53472

INCORPORATING SAFETY-FIRST CONSTRAINTS IN LINEAR PROGRAMMING PRODUCTION MODELS
Provedor de dados: 31
Autores: Atwood,   Joseph A.; Watts,   Myles J.; Helmers,   Glenn A.; Held,   Larry J.
A recent survey indicated that many procedures view risk in a safety-first context. Traditional methods used to impose safety-first constraints in optimization models have often been difficult to implement. This is particularly true when endogenous decisions affect the distribution of the chance-constrained random variable.  This paper presents a method whereby probabilistic constraints can be easily imposed upon finitely discrete random variables. The procedure uses a linear version of the lower partial moment stochastic inequality. The resulting solutions are somewhat conservative but are less so than the results using the previously published mean income-absolute deviation stochastic inequality.
Tipo: Journal Article
Palavras-chave: Production Economics; Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/32152

WTP and WTA in relation to irrigation development in the Fitzroy Basin, Queensland
Provedor de dados: 31
Autores: Rolfe,   John; Bennett,   Jeffrey W.
Estimates of the compensating surplus generated by changes in non-marketed environmental amenities can be estimated using stated preference valuation techniques. These are typically framed in terms of WTP tradeoffs, even if the situation of interest involves a property right vestment that calls for a WTA question. The differences created by the two questioning formats are explored in this paper using the results of two choice modelling applications. Both applications were framed on the potential for irrigation development and environmental losses in the Fitzroy River Basin, Central Queensland. The scenarios used in the applications differed only in that they used alternatively WTP and WTA questioning formats. The results indicate that robust models could...
Tipo: Conference Paper or Presentation
Palavras-chave: Choice modelling; Compensating surplus; WTP; WTA; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/58204

Improving Food Quality through Institutional Innovations: Using a Free‐Rider Approach for Collective Action
Provedor de dados: 31
Autores: Nuppenau,   Ernst-August.
This paper outlines how a team work approach, recently suggested in institutional economics to overcome the problem of externalities, can be used to promote better food quality. Cost sharing as “team work” is considered a novel institution to improve food quality by giving incentives to overcome the public good character of quality. We translate the approach from negative to positive externalities. Hereby: (1) We make a reference to the current state of the discussion on how food quality depends on efforts of a food industry to get a better image and discuss how much need there is to improve quality. (2) An outline of a mathematical approach of a “team work” is presented in the provision of quality as a positive externality and (3) the approach is adapted...
Tipo: Conference Paper or Presentation
Palavras-chave: Food quality; Team; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100460

RELEVANCE OF DUALITY THEORY TO THE PRACTICING AGRICULTURAL ECONOMIST:  DISCUSSION
Provedor de dados: 31
Autores: Young,   Douglas L.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32279

Grain Futures Markets: What Have They Learned?
Provedor de dados: 31
Autores: Santos,   Joseph M.
Taken together, studies that examine how well commodity futures markets perform find that risk premiums are common—and so unbiasedness is not—and markets are not uniformly efficient across commodities or forecast horizons. This large body of research sheds important light on whether and to what extent commodity-futures markets forecast optimally future spot prices and, so, enable commercials to manage price risk by effectively parsing out much of it to speculators, a process that improves the total welfare of an economy with competitive but otherwise-incomplete markets. Nevertheless, that speculators can, in effect, improve welfare in this way has done little to quell popular hostilities toward futures markets. Such hostilities—and, in particular, those...
Tipo: Conference Paper or Presentation
Palavras-chave: Commodities futures markets; Unbiasedness; Efficiency; Chicago Board of Trade; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Demand and Price Analysis; Farm Management; Financial Economics; Marketing; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/53040

From the help desk: Some bootstrapping techniques
Provedor de dados: 31
Autores: Poi,   Brian P.
Bootstrapping techniques have become increasingly popular in applied econometrics and other areas. This article presents several methods and shows how to implement them using Stata’s bootstrap command.
Tipo: Journal Article
Palavras-chave: Bssize initial; Bssize refine; Bssize analyze; Bssize cleanup; Bootstrap; Confidence intervals; Percentile-t; Dependent processes; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116251

Agribusiness Firm Reactions to Regulations: The Case of Investments in Traceability Systems
Provedor de dados: 31
Autores: Heyder,   Matthias; Hollmann-Hespos,   Thorsten; Theuvsen,   Ludwig.
The regulatory framework of food production has changed a lot in recent years. As a result, traceability of food products as become mandatory in the European Union, nonetheless leaving room for more advanced solutions. This study answers the question what exactly determines firms’ investments in traceability systems by first developing a theoretical framework—the so‐called Tracking and Tracing Systems Investment Model—and then analyzing empirical data from the German food industry that provide in‐depth insights into companies’ investment behaviour. Altogether, 234 companies representing more than fifteen different sub‐sectors of the food‐processing industry participated in an online survey. The results show that German food firms can be divided into four...
Tipo: Journal Article
Palavras-chave: Investment behaviour; Traceability; Tracking and tracing; Agribusiness; Food industry; Agribusiness; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/97230

Estimation of sensitivity and specificity arising from validity studies with incomplete designs
Provedor de dados: 31
Autores: Reichenheim,   Michael E.; Ponce de Leon,   Antonio.
This insert introduces valides, validesi, and validesu, a set of commands that allow the calculations of point and precision estimates of sensitivity and specificity obtained in validity studies with incomplete designs.
Tipo: Journal Article
Palavras-chave: Validity; Sensitivity; Specificity; Incomplete design; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/116004

INTERPRETATIONS AND TRANSFORMATIONS OF SCALE FOR THE PRATT-ARROW ABSOLUTE RISK AVERSION COEFFICIENT:  IMPLICATIONS FOR GENERALIZED STOCHASTIC DOMINANCE:  REPLY
Provedor de dados: 31
Autores: Cochran,   Mark C.; Raskin,   Rob.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1987
URL: http://purl.umn.edu/32221

Supplying Improved Seed to Farmers in Rural Kenya: The Case of Freshco Kenya Ltd.
Provedor de dados: 31
Autores: Mabaya,   Edward T.; Cramer,   Laura K.; Mahiga,   Veronica K.; Pham,   Huong Q.; Simpson,   Tara M.; Tang,   Xiaowei C.
Freshco, a small producer and distributor of hybrid maize seed and macadamia seedlings, was one of the first private companies to enter the Kenya seed market after its liberalization. Currently, the company produces and markets six high yielding maize varieties that are suited for diverse agro-ecological conditions. Despite the company’s encouraging growth in the local maize seed market, Freshco’s executives recognize the need to scale up operations to stay competitive. The company’s challenge is to recognize business opportunities and customer needs in an environment susceptible to ecological, political, and socioeconomic change.
Tipo: Journal Article
Palavras-chave: Kenya; Seed industry; Smallholder farmers; Scenario planning; Crop Production/Industries; Farm Management; Research Methods/ Statistical Methods; Q10; Q12.
Ano: 2009
URL: http://purl.umn.edu/53743

THE ROLE OF AREA-YIELD CROP INSURANCE IN FARMERS' ADJUSTMENT AGAINST RISK IN A DRYLAND REGION OF PORTUGAL
Provedor de dados: 31
Autores: Serrao,   Amilcar; Coelho,   Luis.
This research develops a mathematical programming model to maximize the expected utility of the farmers' wealth-producing cereals in the Alentejo dryland region of Portugal, and it is used to determine the premium rate that crop farmers are willing to pay for reducing the variability of their incomes, and the Portuguese government subsidy of the premium rate in the case where the farmer is not willing to pay the totality of this.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/21841

USING ECONOMIC VALUE ADDED (EVA) TO EXAMINE FARM BUSINESSES
Provedor de dados: 31
Autores: Ibendahl,   Gregory A.; Fleming,   Ronald A.
The four profitability measures recommended by the Farm Financial Standards Task Force have limitations for examining wealth creation. Non-farm corporations, by contrast, have started to use Economic Value Added (EVA) to measure wealth creation. EVA has some advantages over other financial ratios because it fully accounts for the resources used on the farm and it includes both realized and unrealized capital gains in the calculation. This article examines the EVA metric for three years of farm financial data to determine if it provides additional information about wealth creation and profitability than do the other four ratios. Factors that help predict EVA are also examined.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35145

Willingness-to-Pay for New Products in a University Foodservice Setting
Provedor de dados: 31
Autores: Zhou,   Guzhen; Tran Cong,   Chinh; Poerwanto,   Devie A.; Goodman,   Lucas A.; Pelton,   Marie E.; Vollaro,   Michele; Childress,   Ronald; Kaninda Tshikala,   Sam; He,   Xiao; Zheng,   Zijuan; Maynard,   Leigh J.
A dairy products manufacturer wishing to expand into university foodservice operations collaborated with a graduate marketing class to research student preferences regarding the Company’s products.  Baseline and follow-up stated choice surveys and conditional logit analyses were conducted at a land-grant university where the Company’s products were introduced.  Brand awareness grew but remained low during the study period.  Average WTP estimates for the Company’s most popular product approximated the retail price and resembled WTP for a competing brand.  Average WTP for the Company’s other products, however, was considerably lower than the retail price.  Significant WTP differences existed among some consumer segments.
Tipo: Conference Paper or Presentation
Palavras-chave: Willingness-to-Pay; Consumer Segment; University Foodservice; Conjoint analysis; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61332

Review of Regression Models for Categorical Dependent Variables Using Stata, Second Edition, by Long and Freese
Provedor de dados: 31
Autores: Williams,   Richard A.
This article reviews Regression Models for Categorical Dependent Variables Using Stata, Second Edition, by Long and Freese.
Tipo: Journal Article
Palavras-chave: Categorical data; Regression models; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117578

A NOTE ON THE BOX-COX TRANSFORMATION UNDER HETEROSKEDASTICITY
Provedor de dados: 31
Autores: Blaylock,   James R.; Salathe,   Larry E.; Green,   Richard D.
The Box-Cox transformation (BCT) has been frequently used as both a flexible functional form and as a decision device to distinguish among alternative model specifications.  Most researchers have failed to recognize that the BCT when applied to the dependent variable can compensate for heteroskedasticity.  This paper investigates a new procedure which estimates both the BCT parameters and the analytic form of heteroskedasticity.  Results from the new procedure are compared to estimates obtained from the traditional method of estimating BCT models.  Comparisons indicate that proper specification of the error variance can influence the magnitude of BCT parameters and alter the results of hypothesis testing.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/32394

A model-based approach to moral hazard in food chains - What contribution do principal-agent-models make to the understanding of food risks induced by opportunistic behaviour?
Provedor de dados: 31
Autores: Hirschauer,   Norbert.
Food risks may be caused by moral hazard, i.e. by opportunistic behaviour of upstream sellers who exploit the fact that many food product qualities remain uncertain to downstream buyers in the course of conventional market transactions (credence qualities). Due to this lack of market transparency buyers run the risk to pay premium prices for inferior products (quality risks); furthermore, they run the risk to use or consume substances which are harmful (health risks). Therefore, they will want to design optimal contracts and controls preventing opportunistic behaviour. Usually, however, buyers cannot contract contingent on the actions of upstream sellers because they cannot observe them directly (information asymmetry). Motivated by the obviously...
Tipo: Journal Article
Palavras-chave: Food risk; Information asymmetry; Moral hazard; Opportunistic behaviour; Prevention; Principal-agent-model; Traceability; Agribusiness; Farm Management; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2004
URL: http://purl.umn.edu/97448

ITERATIVE LEAST SQUARES ESTIMATION OF CENSORED REGRESSION MODELS WITH UNKNOWN ERROR DISTRIBUTIONS
Provedor de dados: 31
Autores: Tsur,   Yacov; Zemel,   Amos.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/14118

Assessing the impact of agricultural research on farmer's knowledge about African animal trypanosomosis : An application of the propensity score matching approach
Provedor de dados: 31
Autores: Liebenehm,   Sabine; Affognon,   Hippolyte; Waibel,   Hermann.
Ex-post evaluation of agricultural research is aimed to empirically provide evidence of past investments’ effectiveness. This paper is intended to measure the immediate impact of livestock research activities on cattle farmers’ knowledge about trypanosomosis and its therapeutic and preventive control strategies. According to the quasi-experimental design of the intervention, it is shown that its impact will be adequately estimated by propensity score matching (PSM). Based on data collected according to a knowledge, attitude and practice (KAP) questionnaire in the region of Kénédougou that is common to Mali and Burkina Faso, results indicate a significant gain in farmers’ know-how due to participation in livestock research activities.
Tipo: Conference Paper or Presentation
Palavras-chave: African animal trypanosomosis (AAT); Knowledge; Attitude and practice (KAP); Propensity score matching (PSM); Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53277

Speaking Stata: Making it count
Provedor de dados: 31
Autores: Cox,   Nicholas J.
The count command has one simple role, to count observations in general or that satisfy some condition(s). This task can be useful when some larger problem pivots on counting, especially if count is used with a loop over observations or variables. I use various problems, mostly of data management, as examples. I also make comparisons with the use of _N, summarize, and egen for the same or similar problems.
Tipo: Article
Palavras-chave: Count; Counting; Data management; Dropping variables; Finding matches; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119259

Modelling the management of multiple-use reservoirs: Deterministic or stochastic dynamic programming?
Provedor de dados: 31
Autores: Tran,   Lap Doc; Schilizzi,   Steven; Chalak,   Morteza; Kingwell,   Ross S.
Modelling complex systems such as multiple-use reservoirs can be challenging. A legitimate question for scientists and modellers is how best to model their management under uncertain rainfall. This paper studies whether it is worth using a stochastic model that requires more effort than a much simpler deterministic model. Both models are applied to the management of a multiple-use reservoir in southern Vietnam. Although no single modelling approach is universally superior, this study indicates that the desirable modelling approach is stochastic if reservoir capacity and water use demands have a high enough impact on the optimal timing of reservoir water use.
Tipo: Presentation
Palavras-chave: Deterministic dynamic proramming; Stochastic dynamic programming; Water management; Irrigation; Fisheries; Multiple-use reservoir; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2012
URL: http://purl.umn.edu/124463

'Individual' versus 'Household' in Recreational Demand Models
Provedor de dados: 31
Autores: Veronesi,   Marcella.
This study proposes a novel approach to estimating a recreational demand model that accounts for intra-household resource allocation. The technique is based on an analogy borrowed from the literature of collective household behavior and, in particular, on Browning, Chiappori and Lewbel (2006)’s model. We formulate a collective recreational demand model that takes into account the role of each member’s preferences for consumption choices and that depends on how disposable income is divided within the household. This model identifies the Consumer Surplus for each household member and the allocation of resources within a household by a consumption technology function, which summarizes all of the technological economies of scale and scope that result from...
Tipo: Working or Discussion Paper
Palavras-chave: Consumer/Household Economics; Demand and Price Analysis; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/98551

INCOME REMINDER AND THE DIVERGENCE BETWEEN WILLINGNESS-TO-PAY ESTIMATES ASSOCIATED WITH DICHOTOMOUS CHOICE AND OPEN-ENDED ELICITATION FORMATS
Provedor de dados: 31
Autores: He,   Senhui; Jordan,   Jeffrey L.; Florkowski,   Wojciech J.
This study investigates whether an income reminder can reduce the divergence between the willingness-to-pay (WTP) estimates associated with the open-ended (OE) and dichotomous choice (DC) elicitation formats.  Results show that without an income reminder, WTP estimate associated with DC elicitation format is about 1.66 times as large as that associated with OE elicitation format.  With an income reminder, the WTP estimate associated with DC format decreased while the WTP estimate associated with OE format increased, and the divergence between the WTP estimates was almost eliminated.
Tipo: Conference Paper or Presentation
Palavras-chave: Dichotomous choice; Open-ended; Income reminder; Water quality improvement; Willingness-to-pay; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/35193

IMPACTOS DA ESTABILIZAÇÃO MONETÁRIA E DA ESTRATÉGIA COMPETITIVA DA INDÚSTRIA, SOBRE O CONSUMO DE CAFÉ TORRADO NO BRASIL
Provedor de dados: 31
Autores: Carvalho de Mesquita,   Jose Marcos; Lara,   Jose Edson; Souki,   Gustavo Quiroga.
The main purpose of this research is to evaluate the influence of two distinct programs over the coffee consumption in Brazil. The first one is the implementation of “Plano Real” and it’s consequences in terms of monetary stabilization and income growing. The second refers to a program that aimed to increase the quality of toasted coffee, launched by Associação Brasileira da Industria do Café – ABIC -, named “Selo Pureza” (“Pureness Seal”). Macroeconomics conditions are considered external variables. However they can not be controlled by the organizations once they are able to cause high impacts on a company performance. Cooperative strategy is an association and in this case, participants have total control and can plan results. The methodology involves...
Tipo: Journal Article
Palavras-chave: Estratégia competitiva e estratégia relacional; Mercado de café; Agronegócio; Competitive strategy; Cooperative strategy; Coffee market; Agribusiness.; Agribusiness; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2010
URL: http://purl.umn.edu/102040

Simple thematic mapping
Provedor de dados: 31
Autores: Pisati,   Maurizio.
Thematic maps illustrate the spatial distribution of one or more variables of interest within a given geographic unit. In a sense, a thematic map is the spatial analyst’s equivalent to the scatterplot in nonspatial analysis. This paper presents the tmap package, a set of Stata programs designed to draw five kinds of thematic maps: choropleth, proportional symbol, deviation, dot, and label maps. The first three kinds of maps are intended to depict area data, the fourth is suitable for representing point data, and the fifth can be used to show data of both types.
Tipo: Journal Article
Palavras-chave: Tmap choropleth; Tmap propsymbol; Tmap deviation; Tmap dot; Tmap label; Thematic map; Choropleth map; Proportional symbol map; Deviation map; Dot map; Label map; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116257

Outcome Mapping: A method for tracking behavioural changes in development programs
Provedor de dados: 31
Autores: Smutylo,   Terry.
Outcome mapping is a methodology for planning, monitoring and evaluating development initiatives that aim to bring about social change. The process of outcome mapping helps a project team or program to be specific about the actors it targets, the changes it expects to see and the strategies it employs. Results are measured in terms of the changes in behaviour, actions or relationships that can be influenced by the team or program. The methodology is comprised of several tools, which can be adapted to different contexts. It enhances team and program understanding of change processes, improves the efficiency of achieving results and promotes realistic and accountable reporting.
Tipo: Report
Palavras-chave: Outcome; PME; Planning; Monitoring; Evaluation; Methodology; Social change; Agricultural and Food Policy; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/52517

PANEL ESTIMATORS TO COMBINE REVEALED AND STATED PREFERENCE DICHOTOMOUS CHOICE DATA
Provedor de dados: 31
Autores: Loomis,   John B.
Combining stated and revealed preference data often involved multiple responses from the same individual. Panel estimators are appropriate to jointly model the decision to actually visit at current trip costs, the intention to visit at hypothetically higher trip costs, and the intention to visit at proposed quality levels. To incorporate data on all three choices, the random effects probit model is used to estimate the economic value of changes in instream flow as a covariate in the model and calculating value under alternative flow regimes.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/30862

Patterns of restructuring food markets in South Africa: The case of fresh produce supply chains
Provedor de dados: 31
Autores: Chikazunga,   Davison; Joordan,   D.; Bienabe,   Estelle; Louw,   Andre.
The restructuring process of the food markets in South Africa is at an advanced stages of consolidation and the emergence dominance of few supermarket chains expanding into non-traditional areas, through franchise format stores and forecourt stores overtaking informal wet markets and green grocers. The growth has been followed by consolidation of the procurement system from a decentralised to a centralised procurement and distribution mechanism replacing the wholesaling function of the National Fresh Produce Markets.  The growth in disposable income, , population growth and urbanization have fuelled the demand food outlets like supermarkets which in turn fuels innovations and dynamic changes surrounding supermarkets Keywords: Fresh produce, Procurement,...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; International Relations/Trade; Land Economics/Use; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/51995

ANALYSIS OF "DON'T KNOW" RESPONSE TO REFERENDUM CONTINGENT VALUATION QUESTIONS
Provedor de dados: 31
Autores: Haener,   Michel K.; Adamowicz,   Wiktor L.
This paper considers the treatment of "don't know" (DK) responses to referendum contingent valuation questions.  The determinants of DK responses are empirically analyzed using a data set from a survey of old growth forest valuation.  It is found that DK respondents possess unique characteristics that differentiate them from Yes and No respondents.  These findings do not support the most common treatments of DK responses that are currently used.  Responses to an open-ended question included in the survey are used to provide further insight into the preferences of DK respondents.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/31518

Flexible parametric alternatives to the Cox model, and more
Provedor de dados: 31
Autores: Royston,   Patrick.
Since its introduction to a wondering public in 1972, the Cox proportional hazards regression model has become an overwhelmingly popular tool in the analysis of censored survival data. However, some features of the Cox model may cause problems for the analyst or an interpreter of the data. They include the restrictive assumption of proportional hazards for covariate effects, and “loss” (non-estimation) of the baseline hazard function induced by conditioning on event times. In medicine, the hazard function is often of fundamental interest since it represents an important aspect of the time course of the disease in question. In the present article, the Stata implementation of a class of flexible parametric survival models recently proposed by Royston and...
Tipo: Journal Article
Palavras-chave: Parametric survival analysis; Hazard function; Proportional hazards; Proportional odds; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115931

Two New Simple Bibliometric Indexes to Better Evaluate Research in Economics
Provedor de dados: 31
Autores: Anania,   Giovanni; Caruso,   Annarosa.
The paper proposes two new simple indexes - the k and w indexes - to assess a scientist’s publications record based on citations. The two indexes are superior to the widely used h index (Hirsch, 2005), as they preserve all its valuable characteristics and try to overcome one of its known major shortcomings, i.e. that it uses only a fraction of the information contained in a scientist’s citations profile and, as a result, does not show a sufficiently fine ‘granularity’ (the h index is defined over the set of positive integers) to allow a fully satisfactory ranking of scientists. This problem is particularly acute in those disciplines, such as Economics, where scientific productivity and citation practices typically yield fewer citations per paper and, as a...
Tipo: Presentation
Palavras-chave: Bibliometrics; Citation statistics; H-index; Evaluating research in Economics; Research Methods/ Statistical Methods; A11.
Ano: 2012
URL: http://purl.umn.edu/124116

Stata tip 36: Which observations?
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117594

Stata tip 73: append with care!
Provedor de dados: 31
Autores: Baum,   Christopher F.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122710

Standardizing anthropometric measures in children and adolescents with new functions for egen
Provedor de dados: 31
Autores: Vidmar,   Suzanna; Carlin,   John B.; Hesketh,   Kylie; Cole,   Tim.
A new function for egen has been developed to allow transformation of child anthropometric data to z-scores using the LMS method and the reference data available from the 1990 British Growth Reference and the 2000 US CDC Growth Reference. An additional function allows for children to be categorized according to body mass index (weight/height2) using international cutoff points recommended by the Childhood Obesity Working Group of the International Obesity Taskforce.
Tipo: Journal Article
Palavras-chave: Z-scores; LMS; Egen; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116210

PRIMARY DETERMINANTS AND THE SPATIAL DISTRIBUTION OF CORRUPTION
Provedor de dados: 31
Autores: Ortega,   David L.; Florax,   Raymond J.G.M.; Delbecq,   Benoit A.
This paper analyzes the spatial distribution of corruption and its primary economic and political determinants. Economic freedom and development are found to lower incidences of corruption.  Of notable significance, this study finds empirical evidence of a non-linear relationship between a country’s level of democracy and corruption. Extreme authoritarian regimes are found to have lower corruption levels than hybrid regimes, but past a certain threshold democracy inhibits corruption. More importantly the analysis in this paper finds that the economic and political actions of a country have a significant impact on corruption levels worldwide.
Tipo: Working or Discussion Paper
Palavras-chave: Corruption; Spatial econometrics; Economic freedom; Political democracy; Political Economy; Public Economics; Research Methods/ Statistical Methods; C21; D73; H11.
Ano: 2010
URL: http://purl.umn.edu/101395

Recovering Preferences from a Dual-Market Locational Equilibrium
Provedor de dados: 31
Autores: Kuminoff,   Nicolai V.
This paper develops a new structural estimator that uses the properties of a market equilibrium, together with information on households and their observed location choices, to recover horizontally differentiated preferences for a vector of local public goods. The estimation is consistent with equilibrium capitalization of local public goods and recognizes that job and house location choices are interrelated. By using set identification to distinguish the identifying power of restrictions on the indirect utility function from the identifying power of assumptions on the distribution of preferences, the estimator provides a new perspective on characteristics-based models of the demand for a differentiated product. The estimator is used to recover...
Tipo: Conference Paper or Presentation
Palavras-chave: Consumer/Household Economics; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/5989

Comparing Willingness-to-Pay Estimates from Experimental Auctions with Mailed Surveys Incorporating Cheap Talk
Provedor de dados: 31
Autores: Froehlich,   Eve J.; Carlberg,   Jared G.
Willingness-to-pay (WTP) results from experimental auctions are compared to those from cheap-talk and conventional surveys for branded beef products in Canada. It is found that while the cheap-talk survey appears to mitigate hypothetical bias compared to the conventional survey, cheap-talk survey WTP remains higher than that in experimental auctions.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/34945

Risk Adjusted Productivity Measures
Provedor de dados: 31
Autores: Glazyrina,   Anna; Shaik,   Saleem.
Tipo: Conference Paper or Presentation
Palavras-chave: Risk; Productivity measures; DEA; Hyperbolic distance function; Panel data; Productivity Analysis; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/56580

Review of A Visual Guide to Stata Graphics by Mitchell
Provedor de dados: 31
Autores: Kohler,   Ulrich.
This article reviews A Visual Guide to Stata Graphics by Mitchell.
Tipo: Journal Article
Palavras-chave: Graphics; Stata; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116276

ERRATA: FORMULATION OF PROPORTIONALITY RESTRAINTS IN LINEAR PROGRAMMING
Provedor de dados: 31
Autores: Filan,   S.J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/9211

MICROWAVE: A GENERIC FRAMEWORK FOR MICRO SIMULATIONBASED EX ANTE POLICY EVALUATION
Provedor de dados: 31
Autores: Wolfert,   Jacques; Lepoutre,   Jan; Dol,   Wietse; Van Passel,   Steven; van der Veen,   Hennie B.; Bouma,   Foppe.
This paper presents the MicroWave approach that has been developed to improve the process of modeling in the context of micro simulation. It leads to a more efficient model development, better quality of models and their output and improvement in knowledge management. A conceptual framework has been developed and translated into a hierarchical structure of GAMS program code. Besides, several software applications and other tools have been developed for support. These products are presented and some examples illustrate how MicroWave can be applied. MicroWave is especially useful in interdisciplinary research in which different persons are involved in the modeling process and when different models have to be combined.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/29143

Variable Input Allocation: Why Heterogeneity Matters?
Provedor de dados: 31
Autores: Letort,   Elodie; Carpentier,   Alain.
The allocation of variable inputs among crops is a common problem in applied studies that use farm accountancy data. Standard farm accounting information is typically restricted to aggregate or whole-farm input expenditures; there are usually no details on how these expenditures are split among crops. Most studies employing multi-crop econometric models with land as an allocable fixed input consider generally variable input uses at the farm level (Moore and Negri, 1992). However, the allocation of variable inputs among crops appears to be useful for several objectives, such as to analyze the evolution of gross margins at the crop level, to investigate the empirical validity of a multi-crop econometric model and to provide important information for...
Tipo: Conference Paper or Presentation
Palavras-chave: Variable Input Allocation; Heterogeneity; Agricultural and Food Policy; Agricultural Finance; Crop Production/Industries; Farm Management; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/109387

LEARNING AND TECHNOLOGY SPILLOVER: PRODUCTIVITY CONVERGENCE IN NORWEGIAN SALMON AQUACULTURE
Provedor de dados: 31
Autores: Tveteras,   Ragnar.
An econometric analysis of productivity convergence in Norwegian salmon aquaculture is undertaken. We also test for the effects of learning and external industry infrastructure capital.  Empirical evidence for reduction in productivity differentials  is found, but the estimated models also provide indications of more permanent differences in productivity and their underlying sources.
Tipo: Conference Paper or Presentation
Palavras-chave: Production economics; Production Economics; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21651

A Dual Approach to Estimation With Constant Prices
Provedor de dados: 31
Autores: Paris,   Quirino; Caputo,   Michael R.
In a recent paper, Mundlak assumes that the price-taking, risk-neutral and profit-maximizing entrepreneur makes his decisions on the basis of a planning model that maximizes expected profit using expected prices. In the same paper, the author asserts that when there is no sample price variation across competitive firms, it is impossible to estimate the supply and factor demand functions from cross-section data using a dual approach. In a famous paper, titled “To Dual or not to Dual,” Pope asserted a similar opinion. This paper shows that, using Mundlak’s assumption about planning decisions based upon expected profit, it is possible to use a dual estimator to estimate supply and factor demand functions. This objective is achieved by using Mundlak’s...
Tipo: Working or Discussion Paper
Palavras-chave: Constant prices; Dual approach; Cobb-Douglas; Nonlinear errors-in-variables; Demand and Price Analysis; Research Methods/ Statistical Methods; D0; C3.
Ano: 2003
URL: http://purl.umn.edu/93740

Censored Probit Estimation with Correlation near the Boundary: A Useful Reparameteriztion
Provedor de dados: 31
Autores: Terza,   Joseph V.; Tsai,   Wei-Der.
The conventional computational algorithms for full information maximum likelihood (FIML) estimation of the censored probit model (see Farber, 1983), will sometimes fail to converge when the estimated value of the correlation coefficient (ñ) approaches ±1; even when the true value of ñ is not at a boundary. We show that a simple reparametrization of the censored probit model may afford straightforward Newton-Raphson convergence to the true FIML estimate for cases in which likelihood maximization under the conventional censored probit parameterization would have failed. Moreover, our method avoids the computational and inferential complications that arise in alternative methods that, based on a specified criterion, suggest fixing the estimated value of ñ at...
Tipo: Journal Article
Palavras-chave: Sample selection; Endogenous treatment effects; Endogenous switching; Qualitative dependent variables; Informal elderly care; Research Methods/ Statistical Methods; I12; C24; C63.
Ano: 2006
URL: http://purl.umn.edu/50278

A survey on survey statistics: What is done and can be done in Stata
Provedor de dados: 31
Autores: Kreuter,   Frauke; Valliant,   Richard.
This article will survey issues in analyzing complex survey data and describe some of the capabilities of Stata for such analyses. We will briefly review key elements of survey design and explain the effects of different design features on bias and variance. We compare different methods of variance estimation for stratified and clustered samples and discuss the handling of survey weights. We will also give examples for the practical importance of Stata’s survey capabilities.
Tipo: Article
Palavras-chave: Cluster sampling; Complex design; Nonresponse; Stratified sampling; Variance estimation; Weights; DEFECT; NHANES; NHIS; PISA; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119252

RECENT DEVELOPMENTS IN EU POLICIES – CHALLENGES FOR PARTIAL EQUILIBRIUM MODELS
Provedor de dados: 31
Autores: Britz,   Wolfgang; Heckelei,   Thomas.
This paper gives an overview on current and prospective modelling challenges for agricultural partial equilibrium (PE) models focussing on EU policies. Starting from a certain policy context, the paper highlights the current capabilities and limitations of existing PE models and, if available, develops some ideas on future modelling directions to advance the usefulness of quantitative information provided.
Tipo: Conference Paper or Presentation
Palavras-chave: Policy impact assessment; Agricultural partial equilibrium models; Common Agricultural Policy; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6315

DYNAMIC PROGRAMMING:  HAS ITS DAY ARRIVED?
Provedor de dados: 31
Autores: Burt,   Oscar R.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32259

A Flexible Parametric Family for the Modeling and Simulation of Yield Distributions
Provedor de dados: 31
Autores: Ramirez,   Octavio A.; McDonald,   Tanya U.; Carpio,   Carlos E.
The distributions currently used to model and simulate crop yields are unable to accommodate a substantial subset of the theoretically feasible mean-variance-skewness-kurtosis (MVSK) hyperspace. Because these first four central moments are key determinants of shape, the available distributions might not be capable of adequately modeling all yield distributions that could be encountered in practice. This study introduces a system of distributions that can span the entire MVSK space and assesses its potential to serve as a more comprehensive parametric crop yield model, improving the breadth of distributional choices available to researchers and the likelihood of formulating proper parametric models.
Tipo: Journal Article
Palavras-chave: Risk analysis; Parametric methods; Yield distributions; Yield modeling and simulation; Yield nonnormality; Agribusiness; Agricultural Finance; Crop Production/Industries; Land Economics/Use; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; C15; C16; C46; C63.
Ano: 2010
URL: http://purl.umn.edu/90675

Estimating Disaggregate Production Functions: An Application to Northern Mexico
Provedor de dados: 31
Autores: Msangi,   Siwa; Howitt,   Richard E.
This paper demonstrates a robust method for achieving disaggregation in the estimation of flexible-form farm-level multi-input production functions using minimally-specified data sets. Since our ultimate goal is to address important questions related to the distributional effects of policy changes, we place emphasis on the ability of the model to reproduce the characteristics of the existing production system and to predict the outcomes of these changes at a high level of disaggregation. Achieving this requires the use of farm-level models that are estimated across a wide spectrum of sizes and types, which is often difficult to do with traditional econometric methods, due to limitations of data.  The approach to estimating flexible-form production...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21080

Impact assessment of agricultural research in West Africa: an application of the propensity score matching methodology
Provedor de dados: 31
Autores: Liebenehm,   Sabine; Affognon,   Hippolyte; Waibel,   Hermann.
Replaced with revised version of paper 07/29/09.
Tipo: Conference Paper or Presentation
Palavras-chave: African animal trypanosomosis (AAT); Knowledge; Attitude and practice (KAP); Propensity score matching (PSM); Farm Management; Livestock Production/Industries; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/50829

Data issues in general equilibrium modelling
Provedor de dados: 31
Autores: Beutre,   Benjamin; Rodriguez,   Gil; Pant,   Hom M.
In recent years global general equilibrium (GE) models have been used to analyse policy issues such as trade liberalisation, regional integration and environmental policies. While a global CGE model is an excellent tool to perform a comprehensive analysis of such policies, it requires an enormous amount of data to calibrate or parameterise the model itself. Quality differences in the data sets might affect the results of the model simulation. Identifying and removing problems in the database is an important task for the effective use of a CGE model. In this paper, we suggest an approach to detect and remove major inconsistencies from the database of a CGE model. To illustrate, we examine and modify selected interindustry transactions in the GTAP version 5...
Tipo: Conference Paper or Presentation
Palavras-chave: International Relations/Trade; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/57838

PRELIMINARY EMPIRICAL EVIDENCE CONCERNING AN ASSET THEORY MODEL OF MARKETS FOR STORABLE AGRICULTURAL COMMODITIES
Provedor de dados: 31
Autores: Orden,   David.
This paper has two objectives. The first is to summarize succinctly the concepts and operational procedure underlying the use of vector autoregression techniques. These techniques may be used either in forecasting or to obtain insights about structural relations from historical data that has been observed. The second objective is to estimate a vector autoregressive system that models agricultural price, stock and export determination in order to unravel some of the interactions characterizing the agricultural economy.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/14087

Growth Expectations and Decision to Renovate a Golf Course: An Application of a Censored Model with the Simultaneity Test
Provedor de dados: 31
Autores: Bilgic,   Abdulbaki; Florkowski,   Wojciech J.
Golf course renovation and expected business growth were examined. Endogeneity test  on the   renovation decision and a censored expected growth model rejected the hypothesis of simultaneity and decisions were modeled separately. Key determinants for both decisions were golf facility features, but not respondents'’ characteristics.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21446

MODELING:  A BRIDGE BETWEEN NATURAL SCIENTISTS AND AGRICULTURAL ECONOMISTS
Provedor de dados: 31
Autores: Hoisington,   Caroline.
This paper has a broad topic:  the use of modeling as an area of common interest and as a bridge for research between agricultural biological scientists and agricultural economisits.  The thesis is that modeling is a tool which offers some unique properties, both in itself for addressing research problems and as a mechanism for communication.  To demonstrate this position, examples of current and projected uses of models in the various plant sciences and in agricultural economics will be discussed.  Suggestions will be made as to how both groups of researchers can benefit from working together on models.  Lastly some suggestions will be made as to how scientists and social scientists from various disciplines can work together as teams.
Tipo: Thesis or Dissertation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/11059

The Effect of Exchange Rate Volatility upon Foreign Trade of Hungarian Agricultural Products
Provedor de dados: 31
Autores: Fogarasi,   Jozsef.
This paper takes a new empirical look at the long-standing question of the effect of exchange rate volatility on international trade flows of transition economies in Central Europe by studying the case of Hungarian agricultural exports to their export destination countries between 1999 and 2008. Based on a gravity model that controls for other factors likely to determine bilateral trade, the results show that nominal exchange rate volatility has had a significant positive effect on agricultural trade over this period. This positive effect of exchange rate volatility on agricultural exports suggests that agri-food entrepreneurs are not interested in speeding up the process of joining Hungary to the euro zone.
Tipo: Journal Article
Palavras-chave: International trade; Gravity model; Exchange rate volatility; International Relations/Trade; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2011
URL: http://purl.umn.edu/102403

Difference Analysis on the Sustainable Development of Eco-city - A Case of 14 Cities in Gansu Province, China
Provedor de dados: 31
Autores: Chen,   Hui.
Taking 14 cities of Gansu Province as examples, this paper adopts the Principal Component Analysis and Cluster Analysis methods based on the theory of sustainable development and ecological city. A total of 36 index factors of the sustainable development of eco-city are selected. Through establishing the evaluation index system of sustainable eco-city, the sustainable development level of eco-cities in Gansu Province is analyzed. Research result is as follows: (1) according to the Principal Component Analysis, there are significant regional differences among the sustainable development of eco-city in Gansu Province; and its influencing factors can be summarized as comprehensive economic development factor, industrial development factor, land-use factor,...
Tipo: Thesis or Dissertation
Palavras-chave: Sustainable development; Eco-city; Principal Component Analysis; Cluster Analysis; Gansu Province; China; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/53819

Multi-variable analyses of marketing by wine producers
Provedor de dados: 31
Autores: Doman,   Szilvia.
Tipo: Journal Article
Palavras-chave: Wine distribution; Sales problems; Cluster analysis; Plant size; Agribusiness; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/48089

Scale Measures within the Context of Dynamic Adjustment and External Economies
Provedor de dados: 31
Autores: Luh,   Yir-Hueih.
This study proposes an integrated approach to measuring the broader definition of scale economies proposed by Morrison and Siegel.  The paper attempts to tackle the three unsolved problems in Morrison and Siegel, and thus will offer a methodological refinement and in the meantime make a significant contribution to the literature.  Calculation of the total scale economies measures suggest Taiwan¡¦s production technology exhibit long-run increasing returns to scale in the presence of external economies.  A comparison of the conventional measure of scale economies indicate a possible downward bias when short-run fixity as well as external economies from high-tech capital investment, R&amp;E and human capital, are not explicitly recognized.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/21232

Impact of Firm Characteristics on Expected and Actual Traceability Costs and Benefits in the Italian Fishery Supply Chain
Provedor de dados: 31
Autores: Asioli,   Daniele; Boecker,   Andreas; Canavari,   Maurizio.
Since 2005, the implementation of a traceability system is mandatory to all European food chain operators. The balance of costs to build and maintain the traceability system and benefits of traceability depends on the firm's traceability objectives and its resources, as reflected in characteristics, such as adopted quality management systems (QMS) or firm size. Mora and Menozzi (2005) mention that the cost of traceability is lower when firms already have a QMS in place. Moreover, US producers exporting to multiple destinations, in particular EU and Japan, need to comply with more stringent traceability regulations (De Souza Monteiro and Caswell 2004). This may request the adoption of more sophisticated and costly traceability systems. Food operators tend...
Tipo: Conference Paper or Presentation
Palavras-chave: Traceability; Firm characteristics; Business performance; Fishery operators; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100502

Building Supply‐Systems from Scratch: The Case of Biodiesel Chain in Brazil
Provedor de dados: 31
Autores: Watanabe,   Kassia; Zylbersztajn,   Decio.
The purpose of this article is to study the transplantation of complex agro‐industrial systems. The main focus is the analysis of the biodiesel system in Brazil using the Agro‐Chain System approach (AGS). The AGS analysis considers the institutional and organizational environments and verifies how a governance structure evolves as the institutional environment changes. The methodology used is a case study of the biodiesel chain system in the State of Minas Gerais – Brazil. This local system developed as a result of governmental incentives. The present study’s contribution is that it identifies the main obstacles to implementing agro chains and networks involving regions and actors that do not have previous history of productive organizations.
Tipo: Conference Paper or Presentation
Palavras-chave: Transplant of agro‐industrial systems; Bio‐energy production; Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100499

Semi-subsistence Farm Households in Central and South-eastern Europe: Current State and Future Perspectives
Provedor de dados: 31
Autores: Fritzsch,   Jana; Wegener,   Stefan; Buchenrieder,   Gertrud; Curtiss,   Jarmila; Gomez y Paloma,   Sergio.
The European Union (EU) introduced a special transitional semi-subsistence measure to promote the smallest agricultural producers, so-called semi-subsistence farm households (SFHs) in the enlargement process. An outlook on the future of SFHs requires comprehensive and reliable information on the phenomenon and the impact of policy measures on their development. Therefore, a survey using a standardised questionnaire was conducted in Poland (175 households), Romania (185 households), and Bulgaria (184 households) from July to September 2007. In a first step, four major types of SFHs could be identified by means of cluster analysis: (i) rural diversifiers, (ii) rural pensioners, (iii) farmers, and (iv) rural newcomers. In a second step, a multiobjective...
Tipo: Conference Paper or Presentation
Palavras-chave: Semi-subsistence; Policy analysis; Transition countries; Multiobjective linear programming; Agricultural and Food Policy; Community/Rural/Urban Development; Consumer/Household Economics; Research Methods/ Statistical Methods; C61; P27; Q12.
Ano: 2009
URL: http://purl.umn.edu/51444

Stata tip 12: Tuning the plot region aspect ratio
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116256

General Remedies to Local Problems: An Applied Researcher’s Manual to Multiple Imputation
Provedor de dados: 31
Autores: Kyureghian,   Gayaneh; Capps,   Oral, Jr.; Nayga,   Rodolfo M., Jr.
Nonresponse is a pervasive and persistent problem in survey data. This research reviews several methods for imputing missing values. A special emphasis is placed on the multiple imputation methods as a more generalizable advanced remedy to missingness. An empirical application of these methods, along with a regression or conditional mean imputation, is provided. Contingent upon certain properties of data, inference based guidance to the choice and implementation of these methods is provided.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/108266

Mata Matters: Interactive use
Provedor de dados: 31
Autores: Gould,   William.
Mata is Stata’s matrix language. In the Mata Matters column, we show how Mata can be used interactively to solve problems and as a programming language to add new features to Stata. In this quarter’s column, we look at interactive use of Mata.
Tipo: Journal Article
Palavras-chave: Mata; Interactive use; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117589

CRITIQUE OF THE METHODOLOGY OF AUSTRALIAN AGRICULTURAL ECONOMICS
Provedor de dados: 31
Autores: Stent,   W.R.
In this article attention is drawn to serious methodological weaknesses in Australian agricultural economics. It is frankly polemic in style and after a discussion of the philosophies of science of Popper and Kuhn the author argues that Australian agricultural economists ought to be more critical of the assumptions on which current theory is based and should be seeking to establish a new approach to the problems of the agricultural economy which would place more emphasis on social justice than on 'growth and efficiency'.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1976
URL: http://purl.umn.edu/23044

EXPLORING ALTERNATIVES FOR ESTIMATING SYSTEMS OF EQUATIONS WITH MULTIPLE CENSORED VARIABLES: FARM OUTPUT SUPPLY AND INPUT DEMAND
Provedor de dados: 31
Autores: Arias,   Carlos; Perali,   Carlo Federico.
This paper explores two alternatives for estimating systems of equations with multiple censored variables: Maximum Simulated Likelihood and a two-step technique that seems to be well suited for large samples. The empirical part of the paper estimates a system of cost, cost shares and revenue shares equations of Italian farms using both approaches.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/21591

Simulation-based sensitivity analysis for matching estimators
Provedor de dados: 31
Autores: Nannicini,   Tommaso.
This article presents a Stata program (sensatt) that implements the sensitivity analysis for matching estimators proposed by Ichino, Mealli, and Nannicini (Journal of Applied Econometrics, forthcoming). The analysis simulates a potential confounder to assess the robustness of the estimated treatment effects with respect to deviations from the conditional independence assumption. The program uses the commands for propensity-score matching (att* ) developed by Becker and Ichino (Stata Journal 2: 358–377). I give an example by using the National Supported Work demonstration, widely known in the program evaluation literature.
Tipo: Article
Palavras-chave: Sensatt; Sensitivity analysis; Matching; Propensity score; Program evaluation; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119280

Evaluating Changes in Cropping Patterns due to the 2003 CAP Reform. An Ex-post Analysis of Different PMP Approaches Considering New Activities
Provedor de dados: 31
Autores: Blanco,   Maria; Cortignani,   Raffaele; Severini,   Simone.
Replaced with revised version of paper 02/22/08.
Tipo: Conference Paper or Presentation
Palavras-chave: Ex-post policy evaluation; Positive mathematical programming; CAP reform; Agricultural and Food Policy; Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6674

Optimal intertemporal investment in Australian agriculture: An empirical investigation
Provedor de dados: 31
Autores: Agbola,   Frank W.
This paper empirically investigates optimal intertemporal investment behaviour of farmers in Australia. The dynamic investment model is estimated using pooled crosssectional and time-series farm survey data spanning the period 1979-1993. The model captures intertemporal investment behaviour of farmers, including independent and instantaneous adjustment decisions. Empirical test results indicate that labour, capital, sheep numbers and cattle numbers adjust sluggishly towards their long-run equilibrium levels. Results provide empirical evidence to indicate that adjustment problem is characteristic of production in agricultural zones Australia.
Tipo: Journal Article
Palavras-chave: Australia; Agricultural zones; Optimal intertemporal investment model; Quaxi-fixity; Adjustment costs; Farm Management; Research Methods/ Statistical Methods; C33; C12; C13; C61.
Ano: 2005
URL: http://purl.umn.edu/44094

Análisis econométrico de la heterogeneidad de las preferencias de los individuos: aplicación a la valoración económica de la conservación del paisaje agrícola de montaña
Provedor de dados: 31
Autores: Colombo,   Sergio; Hanley,   Nick.
The need to account for respondents’ preference heterogeneity in stated choice models has motivated researchers to apply random parameter logit and latent class models. In this paper we compare these three alternative ways of incorporating preference heterogeneity in stated choice models and evaluate how the choice of model affects welfare estimates in a given empirical application. Finally, we discuss what criteria to follow to decide which approach is most appropriate.  RESUMEN: La necesidad de incorporar la heterogeneidad en las preferencias de los individuos en los modelos de elección discreta ha llevado a los investigadores a emplear siempre más frecuentemente modelos de parámetros aleatorios o de clases latentes. En este artículo se comparan tres...
Tipo: Journal Article
Palavras-chave: Heterogeneity; Heterogeneidad; Modelos de clases latentes; Modelos de heterogeneidad de la varianza; Modelos de parámetros aleatorios; Paisaje de montaña; Latent class models; Covariance heterogeneity models; Random parameter models; Uphill landscape; Environmental Economics and Policy; Research Methods/ Statistical Methods; C52; Q24.
Ano: 2008
URL: http://purl.umn.edu/37191

CONVERGENCE CRITERIA AND THEIR FULFILMENT BY THE COUNTRIES OUTSIDE THE EURO-ZONE
Provedor de dados: 31
Autores: Nagy,   Henrietta; Kaposzta,   Jozsef.
In order to ensure the sustainable convergence required for the achievement of economic and monetary union (EMU), the Treaty sets five convergence criteria which must be met by each Member State before it can take part in the third stage of EMU and hence before it can adopt the euro. Compliance is checked on the basis of reports produced by the Commission and the European Central Bank (ECB). The criteria are: • government finances (the Commission when drawing up its annual recommendation to the Council of Finance Ministers examines compliance with budgetary discipline on the basis of the following two criteria): o the ratio of annual government deficit to gross domestic product must not exceed 3% at the end of the preceding financial year...
Tipo: Book
Palavras-chave: Economic and monetary union; New member countries; Analyses; Agricultural and Food Policy; Community/Rural/Urban Development; International Development; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43186

OPTIMIZING COMPLEX BIOECONOMIC SIMULATIONS USING AN EFFICIENT SEARCH HEURISTIC
Provedor de dados: 31
Autores: Kazmierczak,   Richard F., Jr.
For simulation to be truly useful for investigating many problems in agricultural economics, non-simplifying optimization techniques need to be employed.  General methods for simulation optimization that do not inhibit system characterization or analysis are available, and they would appear to provide much of the mathematical and optimizing rigor demanded by economists.  This paper describes the theory and algorithm of a robust and efficient simulation optimization approach, the Complex Method.  An example of implementing the algorithm is illustrated using a pest management problem.
Tipo: Working or Discussion Paper
Palavras-chave: Simulation; Optimization; Complex Method; Hill-climbing; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/31661

Life and work on small-scale farms in Norway: an outlook based on survey results linked to financial data
Provedor de dados: 31
Autores: Lien,   Gudbrand D.; Bergfjord,   Ole Jakob; Hoveid,   Oyvind.
This paper studies what causes (small-scale) farmers to leave their farms and typically move to urban areas. A data set is constructed by linking survey results with financial data, and the data set is analyzed by multivariate statistical techniques. Our results indicate that, while existence and size of future farm production is important, there is also a difference between farmers who primarily have financial objectives for their farming, and those who have more lifestyle oriented objectives. The latter group is, everything else being equal, more likely to stay on the farm. This could imply that, if preventing migration from rural to urban areas is a policy objective, production support schemes will be effective for some groups, but will be less...
Tipo: Conference Paper or Presentation
Palavras-chave: Migration; Farmer objectives; Agricultural policy; Structural equation modelling; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/52849

Rural Manufacturers: Attributes and Technical Assistance Needs
Provedor de dados: 31
Autores: Leistritz,   F. Larry; Wanzek,   Janet K.
Tipo: Technical Report
Palavras-chave: Community/Rural/Urban Development; Production Economics; Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/121174

Comparing responses from web and paper-based collection modes in a choice modelling experiment
Provedor de dados: 31
Autores: Windle,   Jill; Rolfe,   John.
To determine whether the collection mode affects sample characteristics and value estimates, paper-based (using drop-off/pick-up) and web-based (using an internet panel) modes were tested.  The exercise elicited values from Brisbane respondents for future environmental improvement of the Great Barrier Reef.    The total per survey cost of the paper-based survey was approximately $70 per survey. The survey took three months to complete.  In contrast, the online survey cost approximately $15 per survey and took two weeks to complete.   The results show there were no differences in gender, education and income levels between the two groups. In the internet group, however, there were more younger and fewer older people.    A comparison of the respondents’...
Tipo: Report
Palavras-chave: Web-based surveys; Internet surveys; Paper-based surveys; Stated preference; Collection mode; Choice experiments.; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94941

Nonparametric Technical Efficiency with N Firms and M Inputs: A Simulation
Provedor de dados: 31
Autores: Tauer,   Loren W.; Hanchar,   John J.
Simulation of nonparametric efficiency shows that even when the number of firms is large, defining ten or more inputs results in most firms being efficient. Comparison of empirical with simulated results suggests that the dimension of the problem rather than actual efficiencies has the greater effect for some empirical results.
Tipo: Working Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/121333

Estimation of multinomial logit models with unobserved heterogeneity using maximum simulated likelihood
Provedor de dados: 31
Autores: Haan,   Peter; Uhlendorff,   Arne.
In this paper, we suggest a Stata routine for multinomial logit models with unobserved heterogeneity using maximum simulated likelihood based on Halton sequences. The purpose of this paper is twofold. First, we describe the technical implementation of the estimation routine and discuss its properties. Further, we compare our estimation routine with the Stata program gllamm, which solves integration by using Gauss–Hermite quadrature or adaptive quadrature. For the analysis, we draw on multilevel data about schooling. Our empirical findings show that the estimation techniques lead to approximately the same estimation results. The advantage of simulation over Gauss–Hermite quadrature is a marked reduction in computational time for integrals with higher...
Tipo: Journal Article
Palavras-chave: Multinomial logit model; Multinomial logistic model; Panel data; Unobserved heterogeneity; Maximum simulated likelihood; Halton sequences; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117572

A Computer Simulation Model of Knowledge Management in Small and Medium Agri-Food Enterprises
Provedor de dados: 31
Autores: Martinez Soto,   Moises E.; Monroy,   Carlos Rodriguez; Fuentes-Pila,   Joaquin; Morris Diaz,   Anne; Araujo,   M. Gil.
System dynamics is an appropriate tool to build management models due to its ease of application in solving unstructured problems. In the twenty-first century the sustainability of organizations is influenced by the way it manages its knowledge. In this sense, knowledge management (KM) represents a strategy that contributes to improving the production supply chain (SC) of the agri-food industry (AFI). The objective of this research is to develop a computer model to simulate the effect of KM on the production of AFI. The methodology applied was that of the system dynamics by using the Vensim PLE ® v. 5.10 software, whose determining indicators were selected through an empirical study of KM in the SC of precooked corn flour industry in Venezuela. The study...
Tipo: Presentation
Palavras-chave: Small and Medium Enterprises; System Dynamics; Supply Chain; Knowledge Management; Food Industry.; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/122029

INCORPORATING MULTIPLE OBJECTIVES IN PLANNING MODELS OF LOW-RESOURCE FARMERS
Provedor de dados: 31
Autores: Flinn,   John C.; Jayasuriya,   Sisira; Knight,   C. Gregory.
Linear goal programming provides a means of formally incorporating the multiple goals of a household into the analysis of farming systems. Using this approach, the set of plans which come as close as possible to achieving a set of desired goals under conditions of land and cash scarcity are derived for a Filipino tenant farmer. A challenge in making LGP models empirically operational is the accurate definition of the goals of the farm household being modelled.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/23062

THE USE AND POTENTIAL OF OPTIMAL CONTROL MODELS IN AGRICULTURAL ECONOMICS
Provedor de dados: 31
Autores: Zilberman,   David.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1982
URL: http://purl.umn.edu/32284

Stata tip 43: Remainders, selections, sequences, extractions: Uses of the modulus
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119264

MEASURING TECHNICAL EFFICIENCY IN A SMALL-SCALE FISHERY: A causality analysis
Provedor de dados: 31
Autores: Sergio,   Colin-Castillo.
The analysis of technical efficiency (TE) on the small-scale fishery is relevant for several reasons. While this type of fishery is highly common in developing countries like Mexico, there are a very limited number of analyses assessing their efficiency. Indeed, there is no precise information on the contribution of the small-scale fisheries to livelihoods and economies in developing nations. Exploring this gap in the research would be relevant for the decision making policy. On the one hand, small-scale fisheries can generate significant profits and be more resilient to shocks and crises; two important elements to poverty alleviation and food security. But on the other hand, small-scale fisheries may overexploit stocks, harming the environment and...
Tipo: Conference Paper or Presentation
Palavras-chave: Stochastic frontier analysis; Technical efficiency; Directed acyclic graph; Causality analysis; Small-scale fishery; Environmental Economics and Policy; Production Economics; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103822

Quantitative Analysis of Dynamic Change of Cultivated Land Pressure in Arid and Semi-arid Areas Based on Food Security - A Case of Jiuquan City, Gansu Province, China
Provedor de dados: 31
Autores: Fu,   Shi-bo; Wang,   Hai-hong; Ma,   Qiong.
Taking the Jiuquan City, Guansu Provice, China as an example, according to the 1997-2007 Gansu Statistical Yearbook, Jiuquan Statistical Yearbook, the Second National Land Investigation in Jiuquan City and other relevant statistical data, models of minimum cultivated area per capita and pressure index of cultivated land are used based on food security. Cultivated land area, population, grain output, sowing area and other factors in years 1997-2007, which affect the cultivated land pressure in arid and semi-arid areas, are analyzed and estimated, as well as the temporal variations of minimum cultivated area per capita and pressure index of cultivated land. Pressure index of cultivated land in Jiuquan City is calculated and the pressure situation of...
Tipo: Thesis or Dissertation
Palavras-chave: Food security; Pressure of cultivated land; Arid and semi-arid areas of China; Land Economics/Use; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/56410

From the help desk: It's all about the sampling
Provedor de dados: 31
Autores: McDowell,   Allen; Pitblado,   Jeffrey S.
Effective estimation and inference, when the data are collected using complex survey designs, requires estimators that fully account for the sampling design. This article explores, by means of Monte Carlo simulations of the power of simple hypothesis tests, the consequences of parameter estimation and inference when naive estimators are employed with survey data.
Tipo: Journal Article
Palavras-chave: Cluster; Design; Power; Strata; Svy; Svymean; Svyset; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115961

ALTERNATIVE APPROACHES ON CONSTRUCTING A COMPOSITE INDICATOR TO MEASURE AGRICULTURAL SUSTAINABILITY
Provedor de dados: 31
Autores: Gomez-Limon,   Jose Antonio; Riesgo,   Laura.
The aim of this paper is to carry out a comparative analysis of alternative methods on constructing composite indicators to measure global sustainability of the agricultural sector. This comparison is implemented empirically on the irrigated agriculture of the Duero basin (Spain) as a case study. For this purpose, this research uses a dataset of indicators previously calculated for different farm-types and policy scenarios. The results allow to establish a hierarchy of the policy scenarios on the basis of the level of sustainability achieved. Furthermore, analyzing the heterogeneity of different farms-types in each scenario, is also possible to determine the main features of the most sustainable farms in each case. All this information is useful in order...
Tipo: Conference Paper or Presentation
Palavras-chave: Sustainability; Composite Indicators; Irrigated agriculture; Scenarios; Agricultural policy; Agricultural and Food Policy; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6489

Proving causal relationships using observational data
Provedor de dados: 31
Autores: Bryant,   Henry L.; Bessler,   David A.
We describe a means of rejecting a null hypothesis concerning observed, but not deliberately manipulated, variables of the form H0: A -/-&gt; B in favor of an alternative hypothesis HA: A --&gt; B, even given the possibility of causally related unobserved variables. Rejection of such an H0 relies on the availability of two observed and appropriately related instrumental variables. While the researcher will have limited control over the confidence level in this test, simulation results suggest that type I errors occur with a probability of less than 0.15 (often substantially less) across a wide range of circumstances. The power of the test is limited if there are but few observations available and the strength of correspondence among the variables is weak....
Tipo: Conference Paper or Presentation
Palavras-chave: Causality; Monte Carlo; Observational data; Hypothesis testing; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103238

TESTING AGGREGATION CONSISTENCY ACROSS GEOGRAPHY AND COMMODITIES
Provedor de dados: 31
Autores: Liu,   Qinghua; Shumway,   C. Richard.
Consistent aggregation of production data across commodities and states was tested using Lewbel's generalized composite commodity theorem (GCCT).  This was the first empirical GCCT test for consistent geographic aggregation and was applied to two groups of states.  Consistent commodity aggregation was tested in all states for two output groups and three input groups and in one state for a larger number of groups.  Using a more powerful test procedure than previously applied to production data, most tests for commodity aggregation gave ambiguous results.  Consistent geographic aggregation was generally supported across Pacific Northwest states but was ambiguous across all Western states.   Key words: Aggregation, commodity, geographic, composite commodity...
Tipo: Conference Paper or Presentation
Palavras-chave: Aggregation; Commodity; Geographic; Composite commodity theorem; Multiple-comparison tests.; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22201

ALTERNATIVE BREEDING INVENTORY SPECIFICATIONS IN A LIVESTOCK MARKET MODEL
Provedor de dados: 31
Autores: Vere,   David T.; Griffith,   Garry R.; Bootle,   B.W.
The procedures adopted for incorporating breeding decisions in a livestock market model have implications for the simulation of the model. Specifically, there is a need to consider the nature of the biological lags between livestock breeding decisions and outputs, and how these are incorporated in the breeding inventory used in such a model. In this paper, five alternative breeding inventory specifications are used in a structural econometric model of the Australian prime lamb market. The predictions of lamb slaughterings and of price responses of lamb producers are affected by the specification of the lamb breeding inventory used. The extent to which the modelling results approximated reality was substantially improved when disaggregated and seasonally...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1993
URL: http://purl.umn.edu/22739

Stata par la pratique : statistiques, graphiques et éléments de programmation par Éric Cahuzac et Christophe Bontemps
Provedor de dados: 31
Autores: Terracol,   Antoine.
Cet article propose une revue de Stata par la pratique par Éric Cahuzac et Christophe Bontemps.
Tipo: Article
Palavras-chave: Apprentissage de Stata; Cahuzac; Bontemps; Splp; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122624

REGIONAL HOUSING PRICE CYCLES: A SPATIO-TEMPORAL ANALYSIS USING US STATE LEVEL DATA
Provedor de dados: 31
Autores: Kuethe,   Todd H.; Pede,   Valerien O.
We present a study of the effects of macroeconomic shocks on housing prices in the Western United States using quarterly state level data from 1988:1 – 2007:4. The study contributes to the existing literature by explicitly incorporating locational spillovers through a spatial econometric adaptation of vector autoregression (SpVAR). The results suggest these spillovers may Granger cause housing price movements in a large number of cases. SpVAR provides additional insights through impulse response functions that demonstrate the effects of macroeconomic events in different neighboring locations. In addition, we demonstrate that including spatial information leads to significantly lower mean square forecast errors.
Tipo: Working or Discussion Paper
Palavras-chave: Housing prices; VAR; Spatial econometrics; Community/Rural/Urban Development; Research Methods/ Statistical Methods; C31; C32; R21.
Ano: 2009
URL: http://purl.umn.edu/47596

Longitudinal examination as a possible method of observing agriculture
Provedor de dados: 31
Autores: Fizcerene Nagymihaly,   Kornelia; Nabradi,   Andras; Pummer,   Laszlo.
On the basis of our examinations we have come to the conclusion that longitudinal examinations are the simplest and most up-to-date methods as well as the most cost-efficient ones for following the decision-making, preparatory data collection, processing and analysis opportunities, which better and better serve the sustainability of agriculture, together with subsequently tracking feedback about the decisions to see if the given measure has really resulted in reaching the objectives. The method was proved capable of supplying both micro- and macro-level information in the desired breakdown, groupings and systems of connections. The development successive (panel) examination that we applied can serve as the basis of decision-making affecting huge areas by...
Tipo: Journal Article
Palavras-chave: Longitudinal (development successive) examination; Method; Applicability; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/48090

SCAN DATA RESEARCH: THE STATUS
Provedor de dados: 31
Autores: Fletcher,   Stanley M.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/26853

From the help desk: Polynomial distributed lag models
Provedor de dados: 31
Autores: McDowell,   Allen.
Polynomial distributed lag models (PDLs) are finite-order distributed lag models with the impulse–response function constrained to lie on a polynomial of known degree. You can estimate the parameters of a PDL directly via constrained ordinary least squares, or you can derive a reduced form of the model via a linear transformation of the structural model, estimate the reduced-form parameters, and recover estimates of the structural parameters via an inverse linear transformation of the reduced-form parameter estimates. This article demonstrates both methods using Stata.
Tipo: Journal Article
Palavras-chave: Polynomial distributed lag; Almon; Lagrangian interpolation polynomials; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116237

The Structure of Models: Understanding Theory Reduction and Testing with a Production Example
Provedor de dados: 31
Autores: Davis,   George C.
The language of economics is the language of models. Understanding the structure of this language offers many benefits. Unfortunately, the structure is ubiquitous in implementation but absent in documentation. This paper documents the structure of models in the context of the theory reduction and testing process. The structure is used to explain why there are several legitimate ways to deal with nonspherical errors in econometric models and why the recent work on stochastic preferences and technologies is a progressive step forward for the discipline. A production modeling exercise is presented to help illuminate the concepts.
Tipo: Journal Article
Palavras-chave: Methodology; Models; Theory reduction; Theory testing; Venn diagrams; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/31142

NONPARAMETRIC ANALYSIS OF COST MINIMIZATION AND EFFICIENCY
Provedor de dados: 31
Autores: Lemberg,   Beth; Wongcharupan,   Metha.
This study examines cost minimizing behavior and efficiency measures for a sample of Kansas wheat producers, using nonparametric methods. As such, it verifies the applicability of nonparametrics within a production economic framework.
Tipo: Conference Paper or Presentation
Palavras-chave: Nonparametrics; WACM; Production; Industrial Organization; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20952

EINFLUSS DER BIOGASERZEUGUNG AUF LANDWIRTSCHAFTLICHE PACHTPREISE IN DEUTSCHLAND
Provedor de dados: 31
Autores: Breustedt,   Gunnar; Habermann,   Hendrik.
A2_3
Tipo: Conference Paper or Presentation
Palavras-chave: Biogas; Erneuerbare-Energien-Gesetz; Pachtpreise; Räumliche Ökonometrie; Agricultural and Food Policy; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/93937

RESEARCH NEEDS FOR THE RETAIL FOOD INDUSTRY
Provedor de dados: 31
Autores: Cottrell,   Robert L.
Examines current retail food industry needs and develops priorities.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/27680

Evaluating Consumer Response to GM Foods: Some Methodological Considerations
Provedor de dados: 31
Autores: Marks,   Leonie A.; Kalaitzandonakes,   Nicholas G.; Vickner,   Steven S.
In 1998 the European Union placed a moratorium on the planting of transgenic crops within its borders. The resulting ban on biotech crops has led to the current trans-Atlantic trade dispute between the United States and the EU. At the heart of this dispute is the issue of consumer acceptance. The EU’s current position is predicated on perceived public concerns about biotech foods which found a voice in numerous opinion polls conducted during the late 1990s (e.g., European Commission, 1997, 2000). Such concerns have also been amplified by intense media coverage and resulting political activism. Given the pivotal role that consumer opinion has played in recent EU policy, an understanding of how consumers value biotech foods is critical to informed...
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Consumer/Household Economics; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/45731

EU-wide spatial down-scaling of results of regional economic models to analyze environmental impacts
Provedor de dados: 31
Autores: Britz,   Wolfgang.
Major environmental indicators require data at a spatial resolution below administrative units as found in economic models. The CAPRI-Dynaspat project added spatial results for EU27 to the CAPRI model allowing for linkage to bio-physical models and calculation of novel indicators. The layer consists of clusters of 1x1 km cells exhausting the agricultural area, uniform in soil parameters, slope class, land cover and administrative unit. Crop and irrigation shares, stocking densities and yields are estimated per cluster along with intermediate input demand including crop specific fertilizer application rates. Those estimates drive statistically estimated meta-models from the bio-physical crop growth model DNDC to derive the nitrogen and water cycle....
Tipo: Conference Paper or Presentation
Palavras-chave: Spatial dis-aggregation; Agri-environmental indicators; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6677

A COMPARISON OF VARIOUS FRONTIER ESTIMATION METHODS UNDER DIFFERING DATA GENERATION ASSUMPTIONS
Provedor de dados: 31
Autores: Settlage,   Daniel M.; Dixon,   Bruce L.; Thomsen,   Michael R.
Monte Carlo methods examine the accuracy of several production frontier approximating forms, estimators and methods to rank firms by level of predicted technical efficiency. Results show stochastic frontier methods superior to data envelopment analysis.  The Cobb-Douglas approximating form is superior to the translog or generalized Leontief.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/15773

kountry: A Stata utility for merging cross-country data from multiple sources
Provedor de dados: 31
Autores: Raciborski,   Rafal.
This article describes kountry, a data-management command that can be used to translate one country-coding scheme into another, to recode country names into a “standardized form”, and to generate geographic-region variables. Users can build a custom dictionary through a helper command, kountryadd, that “teaches” kountry new name variations. The dictionary can be protected from an accidental overwriting through two helper commands: kountrybackup and kountryrestore.
Tipo: Article
Palavras-chave: Kountry; Kountryadd; Kountrybackup; Kountryrestore; Country names; Country-coding schemes; Geographical; Region; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122601

A REVIEW OF THREE RESEARCH PROGRAMS IN QUANTITATIVE MODELLING IN THE BUREAU OF AGRICULTURAL ECONOMICS
Provedor de dados: 31
Autores: Kingma,   Onko Tjerek; Longmire,   James L.; Stoeckel,   Andrew B.
Elements of three of the BAE's research programs in economic modelling of the rural sector, namely, the modelling of agricultural production systems, rural commodity markets and agriculture within a general equilibrium framework, are reviewed with emphasis on the use of such models in policy work. Suggestions are made for further modelling in these areas.
Tipo: Journal Article
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 1980
URL: http://purl.umn.edu/22915

BUBBLES IN PRICES OF EXHAUSTIBLE RESOURCES
Provedor de dados: 31
Autores: Jovanovic,   Boyan.
Aside from the equilibrium that Hotelling (1931) displayed, his model of non-renewable resources also contains a continuum of bubble equilibria. In all the equilibria the price of the resource rises at the rate of interest. In a bubble equilibrium, however, the consumption of the resource peters out, and a positive fraction of the original stock continues to be traded forever. And that may well be happening in the market for high-end Bordeaux wines.
Tipo: Working or Discussion Paper
Palavras-chave: Wine; Exhaustible resource; Bubble; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/45830

Finding Maxmin Allocations in Cooperative and Competitive Fair Division
Provedor de dados: 31
Autores: Dall'Aglio,   Marco; Di Luca,   Camilla.
We consider upper and lower bounds for maxmin allocations of a completely divisible good in both competitive and cooperative strategic contexts. We then derive a subgradient algorithm to compute the exact value up to any fixed degree of precision.
Tipo: Working Paper
Palavras-chave: Fair Division; Maxmin Allocation; Kalai Bargaining Solution; Cooperative Game Theory; Research Methods/ Statistical Methods; D63; C61; C71; C78.
Ano: 2011
URL: http://purl.umn.edu/120020

An Improved Method for Calibrating Purchase Intentions in Stated Preference Demand Models
Provedor de dados: 31
Autores: Davies,   Stephen P.; Loomis,   John B.
The Orbit demand model allows the magnitude of the calibration to stated purchase intentions to vary based on the magnitude of the stated quantities. Using an empirical example of stated trips, we find that the extent of calibration varies substantially with less correction needed at small stated trips (–25%) but larger corrections at higher quantities of stated visits (–48%). We extend the Orbit model to calculate consumer surplus per stated trip of $26. Combining the calibrations in stated trips and value per trip, the Orbit model provides estimates of annual benefits from 60% to 111% less than the count data model.
Tipo: Journal Article
Palavras-chave: Hypothetical bias; Orbit; Ordered probit model; Travel cost model; Recreation; Stated preference; Agribusiness; Agricultural Finance; Consumer/Household Economics; Demand and Price Analysis; Financial Economics; Food Consumption/Nutrition/Food Safety; Institutional and Behavioral Economics; Marketing; Production Economics; Productivity Analysis; Research Methods/ Statistical Methods; D12; H44; Q26; Q51.
Ano: 2010
URL: http://purl.umn.edu/100521

A NEW GENERAL CONCEPTUAL APPROACH TO MODELING THE LIVESTOCK SECTOR: AN APPLICATION TO THE JAPANESE SWINE-PORK SECTOR
Provedor de dados: 31
Autores: Fabiosa,   Jacinto F.; Qi,   Xiaoting.
Many livestock sector models have limited coverage of relevant variables, and are somewhat ad hoc in their choice of what should be specified as behavioral equations.  This study develops a generic conceptual approach to modeling the livestock sector that provides consistent rules of specification and better coverage of variables.  This approach is then applied to the swine-pork sector of Japan.  The new approach departs significantly from existing models.  The structure clearly differentiates stock and flow variables; only flow variables have behavioral specifications and stock variables are accounting identities; flow variables are expressed in rates rather than levels; logistic functions are used in most flow variables to automatically impose...
Tipo: Conference Paper or Presentation
Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/20835

Stata tip 70: Beware the evaluating equal sign
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122627

Modeling the Tail Distribution and Ratemaking: An Application of Extreme Value Theory
Provedor de dados: 31
Autores: Hao,   Jianqiang; Bathke,   Arne; Skees,   Jerry R.
Economic analysis of weather risk often depends on accurate assessment of the probability (P) of tail quantiles (Q). Extreme value theory can provide a promising estimation of the tail part risk and this paper intends to apply the extreme value model to estimate the tail risk on India excess rainfall.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/19190

Understanding Foreign Direct Investment in the Southern African Development Community: An Analysis Based on Project-Level Data
Provedor de dados: 31
Autores: Mhlanga,   Nomathemba; Blalock,   Garrick; Christy,   Ralph D.
This paper uses a uniquely rich project-level dataset to analyze determinants and trends of FDI flows to the Southern African Development Community (SADC) region.  We control for the source of the investment, the sector in which the investment is undertaken, and the investment type in addition to project size.  The results indicate market size to have a positive impact on FDI flows under all specifications- a result consistent with earlier studies.  Other variables are unstable depending on specification and the subset of the data used.  Furthermore, we find no significant differences in factors that drive FDI flows by source country, while greenfield investments are seen to respond more to the growth potential of the market relative to other forms of...
Tipo: Conference Paper or Presentation
Palavras-chave: Foreign Direct Investment; Determinants; Africa; International Development; Research Methods/ Statistical Methods; F23; O55.
Ano: 2009
URL: http://purl.umn.edu/51632

AN ARBITRAGE-FREE APPROACH TO QUASI-OPTION VALUE; Proceedings of the Fifth Joint Conference on Agriculture, Food, and the Environment, June 17-18, 1996, Padova, Italy
Provedor de dados: 31
Autores: Coggins,   Jay S.; Ramezani,   Cyrus A.
In the presence of uncertainty and irreversibility, dynamic decision problems should not be solved using expected net present value analysis.  The right to delay a decision can be valuable.  We show that the value of this right equals Arrow and Fisher’s (1974) quasi-option value.  In a discrete model we show how to derive quasi-option value using methods from finance, methods that remove altogether the need to take expected values of future stochastic variables.  Two main findings are presented.  First, if the stochastic dynamic process underlying the problem is known, the Arrow and Fisher and Henry (1974) result that improper use of net present value leads to too much early development, is correct.  Second, if the process is not known perfectly, their...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/14469

DIESE MODELLE SIND ZU KOMPLEX!-ODER DOCH NICHT?: EXPERIMENTELLES DESIGN UND METAMODELLIERUNG ALS MOGLICHER WEG, DAS KOMMUNIKATIONSPROBLEM AGENTENBASIERTER MODELLE IN DER POLITIKANALYSE ZU LOSEN (German)
Provedor de dados: 31
Autores: Happe,   Kathrin; Kellermann,   Konrad.
Agent-based models have recently become very popular. However, it is often difficult to communicate the models' complexity and assumptions. Hence, criticising them becomes a challenging task. This paper addresses this problem and discusses different ways to increase the transparency and acceptability of complex models. We use designed experiments and metamodelling to show relationships between model parameters and the impact of policy options. We do so using the model AgriPoliS which has been initialised using an artificial agricultural structure   Agentenbasierte Ansätze erfreuen sich einer immer größeren Beliebtheit. Allerdings besteht ein grundlegendes Problem dieses Ansatzes darin, dass die Komplexität der angewendeten Modelle und der darin getroffenen...
Tipo: Conference Paper or Presentation
Palavras-chave: Agentenbasierte Modellierung; Design of Experiments; Sensitivitätsanalyse; Politikanalyse; Agent-based modelling; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/7613

Networking Your Way to a Better Prediction: Effectively Modeling Contingent Valuation Survey Data
Provedor de dados: 31
Autores: Bergtold,   Jason S.; Taylor,   Daniel B.; Bosch,   Darrell J.
The purpose of this paper is to empirically compare the out-of-sample predictive capabilities of artificial neural networks, logit and probit models using dichotmous choice contingent valuation survey data. The authors find that feed-forward backpropagation artificial neural networks perform relatively better than the binary logit and probit models with linear index functions. In addition, guidelines for modeling contingent valuation survey data and how to estimate median WTP using artificial neural networks are provided.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/22152

Comparing a best management practice scorecard with an auction metric to select proposals in a water quality tender
Provedor de dados: 31
Autores: Rolfe,   John; Windle,   Jill.
This report compares evaluation frameworks for selecting landholder proposals to improve water quality. A water quality tender performed in the Burdekin region in Northern Australia in 2007/2008 was used as a case study.    Tender bids can be assessed using an inputs-based best management practice scorecard or an outputs-based auction metric. Where landholder proposals are rated by inputs-based criteria, the scorecard approach, and other variants of multi-criteria analysis are commonly applied. Output-based approaches  are typically applied in water quality and conservation tenders. This approach uses an environmental benefits index to summarise the cost-effectiveness of each proposal.  The case study evaluation reported in this paper shows how...
Tipo: Report
Palavras-chave: Water quality tender; Auction metric; Best management practice; Input-based; Output-based; Great Barrier Reef.; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/94939

Understanding values associated with stormwater remediation options in marine coastal ecosystems: A case study from Auckland, New Zealand
Provedor de dados: 31
Autores: Bastone,   Chris; Stewart-Carbines,   Megan; Kerr,   Geoffrey N.; Sharp,   Basil M.H.; Meister,   Anton D.
This paper describes the design and implementation of a choice experiment to understand Aucklanders’ preferences for environmental qualities associated with the effects of urban run-off on marine coastal environments. Auckland’s coastal environments are affected by a range of ecological and human factors. While much research has been undertaken in the area of ecology, little is understood of human preferences for coastal environments and their management. An unlabelled choice experiment was developed with three environmental quality attributes specified at three broad coastal categories. The environmental qualities are ecological health, water clarity, and underfoot conditions. Willingness to pay estimates for these attributes indicates that respondents...
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/59578

Stata tip 11: The nolog option with maximum-likelihood modeling commands
Provedor de dados: 31
Autores: Royston,   Patrick.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116255

EFFICIENCY IN AGRICULTURAL PRODUCTION OF BIODIVERSITY: ORGANIC VS. CONVENTIONAL PRACTICES
Provedor de dados: 31
Autores: Sipilainen,   Timo; Marklund,   Per-Olov; Huhtala,   Anni.
Promotion of environmental sustainable farming practices is an important policy goal for the whole agricultural sector. However, when the efficiency of production is measured in practice, enhancement of environmental quality such as biodiversity and other environmental amenities does not seem to be recognized as a positive output produced by agriculture. Here, we include crop diversity index as an indicator of environmental output in a comparison of efficiency of conventional and organic crop farms. Non-parametric technical efficiency scores are estimated applying data envelopment analysis on a sample of Finnish crop farms for 1994 – 2002. The results show that in a pooled data set conventional crop farms are more technically efficient than organic farms...
Tipo: Conference Paper or Presentation
Palavras-chave: Crop diversity; Shannon index; DDEA; Technical efficiency; Environmental Economics and Policy; Farm Management; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6478

STATIC AND DYNAMIC EFFICIENCY OF POOLED BROILER CONTRACTS: RELATIVE-PERFORMANCE CONTRACTS VS. FIXED-PERFORMANCE CONTRACTS
Provedor de dados: 31
Autores: Wang,   Yanguo; Jaenicke,   Edward C.
With the broiler industry as a backdrop, this paper develops theoretical models to compare optimal incentives of pooled relative-performance and fixed-performance contracts in static and dynamic models that account for both adverse selection and moral hazard.  In spite of some growers’' complaints about the relative-performance contracts used in the broiler industry, model results largely justify the popularity and superiority of relative performance contracts relative to fixed performance contracts
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20406

Speaking Stata: Counting groups, especially panels
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Counting panels, and more generally groups, is sometimes possible in Stata through a reduction command (e.g., collapse, contract, statsby) that produces a smaller dataset or through a tabulation command. Yet there are also many problems, especially with irregular sets of observations for varying times, that do not yield easily to this approach. This column focuses on techniques for answering such questions while maintaining the same data structure. Especially useful are the Stata commands by: and egen and indicator variables constructed for the purpose. With by: we often exploit the fact that subscripts are defined within group, not within dataset. egen functions are often used to produce group-level statistics. Tagging each group just once ensures that...
Tipo: Article
Palavras-chave: Data management; Panels; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119295

TESTING THE SIGNIFICANCE OF DEVIATIONS FROM RATIONAL BEHAVIOR
Provedor de dados: 31
Autores: Tsur,   Yacov.
We propose procedures for testing statistically the significance of violations of nonparametric tests of optimization axioms when observed behavior is measured with error. The tests are robust against parametric specification of the error distribution, thus are nonparametric in both the statistical and economic senses, and are readily implemented numerically. An illustration with demand data is presented.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1990
URL: http://purl.umn.edu/13267

A WHALE OF A GOOD TIME: EXPLORING FLEXIBILITY IN THE RECREATION DEMAND MODEL
Provedor de dados: 31
Autores: Shaikh,   Sabina L.
This research seeks to produce more robust, less biased estimates from the two-constraint recreation demand model by applying globally flexible estimation techniques to travel cost data for California whale watching trips. While locally flexible functional forms do improve upon previously used restrictive forms imposed for estimation of travel cost models, specification errors occur unless the chosen form happens to coincide with the true unknown underlying form.  A globally flexible functional form can consistently approximate the true function and its derivatives for all points in the sample range. This paper seeks to reduce specification error and improve accuracy of estimates from the two-constraint recreation demand model by using a globally flexible...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 1998
URL: http://purl.umn.edu/20826

Price Transmission to Ugandan Coffee Growers in a Liberalized Market
Provedor de dados: 31
Autores: Musumba,   Mark; Sen Gupta,   Rajorshi.
Replaced with revised version of poster 07/21/11.
Tipo: Conference Paper or Presentation
Palavras-chave: Trade Liberalization; Future Prices; Price Transmissions; Ugandan Coffee Growers; Demand and Price Analysis; International Relations/Trade; Research Methods/ Statistical Methods; F13.
Ano: 2011
URL: http://purl.umn.edu/103906

WHEN FLEXIBLE FORMS ARE ASKED TO FLEX TOO MUCH
Provedor de dados: 31
Autores: Driscoll,   Paul J.
Taylor series-based flexible forms cannot be interpreted as Taylor series approximations unless all data used in estimation lie in a region of convergence.  When flexible forms lose their Taylor series interpretation, elasticity estimates will be biased.  When the flexible form is a translog, Rotterdam, or AIDS model, the region of convergence is shown to be the entire positive orthant.  Regions of convergence associated with quadratic, Leontief, and any flexible form that does not employ logged arguments are smaller and may not encompass the entire data set.  Implications for production and demand analyses and experimental design are discussed.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/31226

Contributing to the Analysis of the Sustainability Management in the Organization of the Green Procurement: Theoretical Elements and Empirical Evidence from a Case Study
Provedor de dados: 31
Autores: Pampanini,   Rossella; Martino,   Gaetano.
The introduction of the environmental dimensions within the Public Administration procurements and contracts is increasingly held as contribution to the sustainability of the chains governance. The so called Green Procurement (COM (2001) 274, l.n.488/1999) thus represents an important institutional innovation in Agri-Food Chains and it may potentially act as driver of changing toward a better rooted managerial approach to sustainability.
Tipo: Presentation
Palavras-chave: Agribusiness; Agricultural and Food Policy; Farm Management; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/121994

Adaptive Experimental Design Using the Propensity Score
Provedor de dados: 31
Autores: Hahn,   Jinyong; Hirano,   Keisuke; Karlan,   Dean S.
Many social experiments are run in multiple waves, or are replications of earlier social experiments. In principle, the sampling design can be modified in later stages or replications to allow for more efficient estimation of causal effects. We consider the design of a two-stage experiment for estimating an average treatment effect, when covariate information is available for experimental subjects. We use data from the first stage to choose a conditional treatment assignment rule for units in the second stage of the experiment. This amounts to choosing the propensity score, the conditional probability of treatment given covariates. We propose to select the propensity score to minimize the asymptotic variance bound for estimating the average treatment...
Tipo: Working or Discussion Paper
Palavras-chave: Experimental design; Propensity score; Efficiency bound; Research Methods/ Statistical Methods; C1; C14; C9; C93; C13.
Ano: 2009
URL: http://purl.umn.edu/47107

INTERNATIONAL CONFERENCE ON IMPACT OF AGRICULTURAL RESEARCH AND DEVELOPMENT: WHY HAS IMPACT ASSESSMENT RESEARCH NOT MADE MORE OF A DIFFERENCE?
Provedor de dados: 31
This document contains the proceedings of an international conference on impact assessment research held in San Jose, Costa Rica, from 4-7 February 2002. Co-organized by the Economics Program of the International Maize and Wheat Improvement Center (CIMMYT) and the Standing Panel on Impact Assessment (SPIA) of the Consultative Group on International Agricultural Research (CGIAR), the conference was attended by approximately 150 impact assessment practitioners and users. Participants included representatives from CGIAR Centers, national agricultural research organizations, public and private universities, multilateral lending organizations, development assistance agencies, non-governmental organizations (NGOs), philanthropic foundations, private...
Tipo: Book Chapter
Palavras-chave: Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/23724

Warenkorbanalysen mit Data Mining
Provedor de dados: 31
Autores: Muller,   Stephan.
With increasing price-competition in retail business, marketing becomes the critical success factor. All activities have to be oriented towards customer needs. Within marketing research, the individual act of purchase plays a decisive role and necessitates a holistic analysis of the market basket. Moreover, progress in information technology has enabled us to store huge amounts of data, including a valuable pool of business experiences. It is not possible to make this potential knowledge completely available with conventional statistical approaches. This is where Data Mining provides an ideal approach. It is an analysis process for extracting information from large databases. The aim of the study, submitted as diploma thesis at the ETH Zurich, is to show a...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Agribusiness.
Ano: 2005
URL: http://purl.umn.edu/32007

A COMPLETE CHARACTERIZATION OF THE LINEAR, LOG-LINEAR, AND SEMI-LOG INCOMPLETE DEMAND SYSTEM MODELS
Provedor de dados: 31
Autores: von Haefen,   Roger H.
This study extends LaFrance’'s (1985, 1986, 1990) previous research by deriving the necessary parameter restrictions for two additional classes of incomplete demand system models to be integrable.  In contrast to LaFrance'’s earlier work, this analysis considers models that treat expenditures and expenditure shares as the dependent variables in the specified incomplete demand systems.  With environmental economists increasingly turning to demand system approaches to value changes in environmental quality, these new results significantly expand the menu of empirical specifications which can be used to fit a given data set.  Moreover, the alternative specifications considered in this study, in combination with LaFrance'’s original work, represent a complete...
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/31118

HOW DID POLICY INTERVENTIONS IN WHEAT EXPORT MARKETS IN RUSSIA AND UKRAINE DURING THE FOOD CRISIS 2007/2008 INFLUENCE WORLD MARKET PRICE TRANSMISSION?
Provedor de dados: 31
Autores: Goetz,   Linde; Glauben,   Thomas; Brümmer,   Bernhard.
C1_2
Tipo: Conference Paper or Presentation
Palavras-chave: International price transmission; Wheat market; Food crisis; Markov switching error correction model; Russia; Ukraine; Agricultural and Food Policy; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/93952

Patenting, Commercialization, and US Academic Research in the 21st Century: The Resilience of Basic, Federally-Funded Open Science
Provedor de dados: 31
Autores: Barham,   Bradford L.; Foltz,   Jeremy D.
The life sciences have been the most dynamic area of US university research and commercialization efforts over the past twenty-five years. Using unique data from a large representative sample of life scientists this work examines whether academic patenting and commercialization complement, substitute for, or “hold-up” other research activities. The results highlight the resilience of the basic, federally-funded open scientific research model. Our findings, in turn, underscore the fundamental importance of maintaining the public funding and commitment to the academic, scientific enterprise.
Tipo: Working or Discussion Paper
Palavras-chave: Public Economics; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/92139

The Impact of Increasing Excise Duties on the Economy
Provedor de dados: 31
Autores: Reynolds,   Sanri.
Excise duties have increased considerably over the past few years, raising concerns on the effect this may have on the economy. However, these increases are welcomed by those concerned about the costs of externalities associated with excessive alcohol consumption, including productivity loss, foetal alcohol syndrome, liver cirrhosis, traffic accidents, etc. This study contains results on the impact of a 10% increase in excise duties on the South African economy, using a static computable general equilibrium model. The impact on gross domestic product, trade and prices, as well as changes in the factor market and the welfare of households of the Northern and Western Cape (the two major wine producing provinces in the country) are analysed. The results...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58069

USING CASE STUDIES AS AN APPROACH FOR CONDUCTING AGRIBUSINESS RESEARCH
Provedor de dados: 31
Autores: Sterns,   James A.; Schweikhardt,   David B.; Peterson,   H. Christopher.
Case study research is increasingly important in agricultural economics as a means of collecting data, and building and testing theory.  Case study research has a prescribed set of objectives, epistemology, methodology, and methods that have been developed and tested in a wide range of scholarly and problem-solving situations.  This article reviews these fundamentals and then demonstrates the case study approach within the context of an agribusiness research project.  This application exemplifies how case study research is capable of generating a robust, comprehensive array of "knowledge" about complex, highly interdependent and dynamic economic and social phenomena.
Tipo: Journal Article
Palavras-chave: Agribusiness; Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/34509

Cost of production estimates for wheat, milk and pigs in selected EU member states
Provedor de dados: 31
Autores: Kleinhanss,   Werner; Offermann,   Frank; Butault,   Jean-Pierre; Surry,   Yves R.
Summary: This study summarizes cost estimates based on the EU Farm Accountancy Data Network using the General Cost of Production Model, developed, applied and tested within the FACEPA project. Results are provided for wheat, pigs and milk for the main producer countries of the EU for the period 1999 to 2007. Estimated input-output coefficients are generally based on monetary figures, expressing cost shares referring to total output. Effects of scale, specialization and location can be derived by estimates based on respective sub-samples. Costs per unit are derived based on input-output coefficients and output values, providing costs per hectare or ton for wheat and per ton of milk. There is a considerable variation between Member States not only of...
Tipo: Technical Report
Palavras-chave: Econometric analysis; Production costs; Ökonometrische Analyse; Produktionskosten; Agricultural and Food Policy; Farm Management; Production Economics; Research Methods/ Statistical Methods; C39; Q12.
Ano: 2011
URL: http://purl.umn.edu/118867

Kriging with Nonparametric Variance Function Estimation
Provedor de dados: 31
Autores: Opsomer,   Jean D.; Ruppert,   D.; Wand,   M.P.; Holst,   U.; Hossjer,   O.
A method for fitting regression models to data that exhibit spatial correlation and Heteroskedasticity is proposed.  A combination of parametric and nonparametric regression techniques is used to iteratively estimate the various components of the model.  The approach is demonstrated on a large dataset of predicted nitrogen runoff from agricultural lands in the Midwest and Northern Plains regions of the U.S.  For this dataset, the model is comprised of three main components: (1) the mean function which includes farming practice variables, local soil and climate characteristics and the nitrogen application treatment, is assumed linear in the parameters and fitted by generalized least squares.  (2) the variance function, which contains a local as well as a...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/18582

Measuring the Value of Changes in Ecosystem Services from Agriculture: Economic Contributions to Multidisciplinary Research (PowerPoint)
Provedor de dados: 31
Autores: Swinton,   Scott M.
Tipo: Conference Paper or Presentation
Palavras-chave: Ecosystem services; Economics; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Q.
Ano: 2010
URL: http://purl.umn.edu/58990

QIC program and model selection in GEE analyses
Provedor de dados: 31
Autores: Cui,   James.
The generalized estimating equation (GEE) approach is a widely used statistical method in the analysis of longitudinal data in clinical and epidemiological studies. It is an extension of the generalized linear model (GLM) method to correlated data such that valid standard errors of the parameter estimates can be drawn. Unlike the GLM method, which is based on the maximum likelihood theory for independent observations, the GEE method is based on the quasilikelihood theory and no assumption is made about the distribution of response observations. Therefore, Akaike’s information criterion, a widely used method for model selection in GLM, is not applicable to GEE directly. However, Pan (Biometrics 2001; 57: 120–125) proposed a model-selection method for GEE...
Tipo: Article
Palavras-chave: Qic; Akaike's information criterion; GEE; Likelihood; Model; Quasilikelihood under the independence model criterion; Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119269

Buckley–James method for analyzing censored data, with an application to a cardiovascular disease and an HIV/AIDS study
Provedor de dados: 31
Autores: Cui,   James.
The Buckley–James method and the Cox proportional hazards model were proposed in the 1970s. Both methods can be used to analyze survival-type data, although the former focuses on calculation of the expected value of the survival time and the latter on the relative risk of explanatory variables on the failure event. In cardiovascular disease epidemiological studies, it is essential to correct the effect of taking antihypertensive medicine, which means we need to calculate the expected blood pressure for people who take the medicine. I developed a Stata program to calculate the Buckley–James estimate. I will describe how to use this program to calculate the expected value of a censored outcome and illustrate the method through an example from a...
Tipo: Journal Article
Palavras-chave: Buckley–James method; Censoring; Expectation; Survival; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117542

Indicators September-09
Provedor de dados: 31
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/124220

Empirical analysis of the influencing factors of sugar imports in China
Provedor de dados: 31
Autores: Gong,   Xue-wu; Wu,   Ge.
We study the factors influencing the sugar imports in China. A multivariate linear regression model for quantitative analysis in established and the model is researched with multicollinearity treatment, autocorrelation and heteroscedasticity test. Research result shows that the per capita income and price fluctuation are not the main factors affecting the sugar import in China, but the domestic sugar production and consumption are the key factors. The substitution effect of sugar substitute has been weakening relatively, exchange rate should be an important factor on sugar imports in the future. Finally, suggestions on how to improve the pattern of the import trade and to enhance the international competitiveness of Chinese sugar are put forward.
Tipo: Thesis or Dissertation
Palavras-chave: Sugar; Import volume; Influencing factors; Linear regression analysis; China; Agricultural and Food Policy; International Relations/Trade; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53438

EVALUATING COST AND OUTPUT LEVELS FOR AGRICULTURAL UTILIZATION RESEARCH
Provedor de dados: 31
Autores: Jones,   Harold B., Jr.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1973
URL: http://purl.umn.edu/29424

GEOGRAPHIC AND INSTITUTIONAL DETERMINANTS OF REAL INCOME: A SPATIO-TEMPORAL SIMULTANEOUS EQUATION APPROACH
Provedor de dados: 31
Autores: Ngeleza,   Guyslain K.; Florax,   Raymond J.G.M.; Masters,   William A.
This paper tests a series of prominent hypotheses regarding the determinants of per-capita income using a novel spatial econometric approach to control for spillovers among neighboring countries and for spatially correlated omitted variables. We use simultaneous equations to identify alternative channels through which country characteristics might affect income, and then test the robustness of those effects. We find support for both "institutionalist" and "geographic" determinants of income. A time-varying index of institutional quality has a strong independent effect on current income, but there is also a persistent effect of geographic factors such as seasonal frost, malaria transmission, and coastal location, which influence income through their links...
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/28663

DOCUMENTATION OF THE POLAND FARM SURVEY 2000
Provedor de dados: 31
Autores: Petrick,   Martin.
This documentation summarises the technical information about the Poland farm survey 2000. This survey was recently carried out in co-operation with Polish partners by the Institute of Agricultural Development in Central and Eastern Europe (IAMO) in Halle (Saale), Germany. The topics covered in the documentation are a description and reprint of the questionnaire, sample design, survey organisation and implementation, data management, calculation of certain compound variables, and a brief assessment of the experiences made with the instrument.
Tipo: Working or Discussion Paper
Palavras-chave: Methods of data collection; Microeconomic data; Survey methodology; Research Methods/ Statistical Methods; C81.
Ano: 2001
URL: http://purl.umn.edu/14908

A FAMILY OF AGRONOMIC PRODUCTION FUNCTIONS WITH ECONOMIES OF SCOPE
Provedor de dados: 31
Autores: Lloyd,   Peter J.
This paper derives a family of multiple-output multiple-input production functions from the underlying technologies. These technologies are represented by average yield functions for each of the commodities (crops) produced from a common pool of resources. The production functions are implicitly separable. Examples include the CRETH, translog, generalised power and generalised McFadden functions. Moreover, given a function which is a member of this family, the individual commodity yield and production functions can be recovered. Such implicitly separable multiple-output production functions may exhibit economies or diseconomies of scope which reflect the interactions between outputs sharing a common pool of resources.
Tipo: Journal Article
Palavras-chave: Industrial Organization; Research Methods/ Statistical Methods.
Ano: 1989
URL: http://purl.umn.edu/22584

Buyer and Seller Responses to an Adverse Food Safety Event: The Case of Frozen Salmon in Alberta
Provedor de dados: 31
Autores: Maynard,   Leigh J.; Saghaian,   Sayed H.; Nickoloff,   Megan.
Fish is a low-fat protein source high in omega-3 fatty acids, but in 2004 consumers also heard that farmed salmon had high levels of polychlorinated biphenyl (PCBs). This research evaluated how Canadian consumers and processors reacted to the conflicting health messages. Demand estimates and time-series analysis of 2001-2006 frozen meat scanner data in Alberta, Canada show a significant drop in salmon expenditure share following the PCB finding. The industry responded by launching low-priced wild salmon products, which contributed to significant demand expansion. The analysis illustrates how a food safety threat was averted and even served as a catalyst for growth.
Tipo: Journal Article
Palavras-chave: Salmon; Scanner data; Food safety; Demand; Directed acyclic graphs; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; Q10; Q11; Q16; Q22.
Ano: 2008
URL: http://purl.umn.edu/53629

Monetary Policy Impacts on Cash Crop Coffee and Cocoa Using Structural Vector Error Correction Model
Provedor de dados: 31
Autores: Bamba,   Ibrahim; Reed,   Michael R.
Coffee and cocoa are two agricultural commodities produced mainly in developing countries and exported almost entirely to high income industrialized countries. The international market for these products is marked by high price instability. This paper investigates whether monetary policy disturbances contribute to cocoa and coffee price instability. Monthly time series data were collected for five variables including agricultural prices, industrial prices, money supply, exchange rate, and interest rate. A Vector Error Correction model is used to investigate whether cocoa and coffee prices overshoot in response to unanticipated monetary shock. The econometric evidence points toward overshooting of cocoa, arabica coffee and robusta coffee prices in the...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20056

AGRÁR-MUNKANÉLKÜLISÉG ÉS A TERÜLETI EGYENLŐTLENSÉGEK MAGYARORSZÁGON
Provedor de dados: 31
Autores: Ritter,   Krisztian.
Although many times the new values of rural category has been emphasized in the literature, rural areas show significant disadvantages in general. As a main reason, in Hungary - partly due to the political and economical transition - the role of agriculture in employment has been notably decreased. In Hungary the changing role of agriculture, the rural unemployment and the territorial distribution of unemployment were analyzed numbers of times in the last decades, while there were no researches in agricultural unemployment and it’s territorial characteristics. First goal of the paper is the determination of rural micro-regions that show significant and permanent agricultural job-loss and agricultural unemployment during the period 1990-2003. Comparison...
Tipo: Book
Palavras-chave: Rurális területek; Strukturális válság; Többváltozós statisztikai módszerek; Rural areas; Sructural crisis; Statistical analyses; Community/Rural/Urban Development; Labor and Human Capital; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43412

Leveraging Landscape Change: Instrument design for supporting the evolution of new natural resource industry niches
Provedor de dados: 31
Autores: Hatfield-Dodds,   Steve; Binning,   Carl; Dyack,   Brenda.
This paper outlines how resource degradation in Australia could be reversed with innovative investment approaches that compensate for the main impediments to beneficial landscape change. We argue that the existing suite of policy responses is incomplete and there are benefits to be had by introducing some new approaches for encouraging innovative and creative, appropriate landscape change. We discuss two examples that address the need for instruments that encourage the evolution of new natural resource industry niches: 1. the proposal advanced by the Allen Consulting Group in its recommendations to the Business Leaders Roundtable in 2001 on options for leveraging private investment entitled Repairing the Country 2. a pilot project that is being undertaken...
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods; Q28; D7.
Ano: 2004
URL: http://purl.umn.edu/58704

Stata tip 40: Taking care of business
Provedor de dados: 31
Autores: Baum,   Christopher F.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/119261

Extrapolation in Games of Coordination and Dominance Solvable Games
Provedor de dados: 31
Autores: Mengel,   Friederike; Sciubba,   Emanuela.
We study extrapolation between games in a laboratory experiment. Participants in our experiment first play either the dominance solvable guessing game or a Coordination version of the guessing game for five rounds. Afterwards they play a 3x3 normal form game for ten rounds with random matching which is either a game solvable through iterated elimination of dominated strategies (IEDS), a pure Coordination game or a Coordination game with pareto ranked equilibria. We find strong evidence that participants do extrapolate between games. Playing a strategically different game hurts compared to the control treatment where no guessing game is played before and in fact impedes convergence to Nash equilibrium in both the 3x3 IEDS and the Coordination games. Playing...
Tipo: Working or Discussion Paper
Palavras-chave: Game Theory; Learning; Extrapolation; Research Methods/ Statistical Methods; C72; C91.
Ano: 2010
URL: http://purl.umn.edu/98475

SPATIAL TESTS FOR EDGE-EFFECT EXTERNALITIES AND EXTERNAL SCALE ECONOMIES IN CALIFORNIA AGRICULTURE
Provedor de dados: 31
Autores: Parker,   Dawn Cassandra; Munroe,   Darla K.
This paper test the hypothesis that conflicts along borders shared with conventional farms and potential external economies of scale have led to clustering of certified organic farms, using 1997 data from Yolo County, CA. Using a variety of landscape and areal statistics and a spatially autoregressive limited dependent variable model, we find significant evidence of spatial clustering related to both factors.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20000

Review of Veterinary Epidemiologic Research by Dohoo, Martin, and Stryhn
Provedor de dados: 31
Autores: Audige,   Laurent.
This article reviews Veterinary Epidemiologic Research by Dohoo, Martin, and Stryhn.
Tipo: Journal Article
Palavras-chave: Veterinary; Epidemiology; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116214

Indicators
Provedor de dados: 31
Autores: Kaufman,   Phillip R.; Farrigan,   Tracey L.; Parker,   Timothy S.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/121441

Funnel plots in meta-analysis
Provedor de dados: 31
Autores: Sterne,   Jonathan A.C.; Harbord,   Roger M.
Funnel plots are a visual tool for investigating publication and other bias in meta-analysis. They are simple scatterplots of the treatment effects estimated from individual studies (horizontal axis) against a measure of study size (vertical axis). The name “funnel plot” is based on the precision in the estimation of the underlying treatment effect increasing as the sample size of component studies increases. Therefore, in the absence of bias, results from small studies will scatter widely at the bottom of the graph, with the spread narrowing among larger studies. Publication bias (the association of publication probability with the statistical significance of study results) may lead to asymmetrical funnel plots. It is, however, important to realize that...
Tipo: Journal Article
Palavras-chave: Metafunnel; Funnel plots; Meta-analysis; Publication bias; Small-study effects; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116233

A Simple Lagrange Multiplier F-Test for Multivariate Regression Models
Provedor de dados: 31
Autores: Beatty,   Timothy K.M.; LaFrance,   Jeffrey T.; Yang,   Muzhe.
This paper proposes a straightforward, easy to implement approximate F-test which is useful for testing restrictions in multivariate regression models. We derive the asymptotics for our test statistic and investigate its finite sample properties through a series of Monte Carlo experiments. Both theory suggests and simulations confirm that our approach will result in strictly better inference than the leading alternative
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/25074

An Overview of the Canadian Agriculture and Agri-Food System 2011
Provedor de dados: 31
This 2011 report provides an economic overview of the Canadian agriculture and agri-food system.  It is meant to be a multi-purpose reference document to provide:  an introduction to the agriculture and agri-food system;  a snapshot of structural changes that are occurring throughout the system in response to various factors; and  background data and information to inform public discussions on challenges and opportunities facing the Canadian agriculture and agri-food system.  Charts and tables with brief accompanying texts are used to summarize information and to provide base performance indicators.  The 2011 report begins with a special feature that provides a description of young farmers in Canada including their numbers by farm size, province and farm...
Tipo: Report
Palavras-chave: Agriculture; Agri-food; R&amp;D; Consumers; GDP; Employment; Exports; Imports; Innovation; Young farmers; Farm typology; Income; Government support; Trade; Productivity; Food processing; Food manufacturing; Environment; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Consumer/Household Economics; Demand and Price Analysis; Environmental Economics and Policy; Farm Management; Financial Economics; Food Consumption/Nutrition/Food Safety; International Relations/Trade; Labor and Human Capital; Land Economics/Use; Livestock Production/Industries; Marketing; Production Economics; Productivity Analysis; Public Economics; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/103047

A COMPARATIVE ANALYSIS OF RISK PREFERENCE ELICITATION PROCEDURES USING MAIL SURVEY RESULTS
Provedor de dados: 31
Autores: Fausti,   Scott W.; Gillespie,   Jeffrey M.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2000
URL: http://purl.umn.edu/36469

Properties of Flexible Functional Forms for Modeling Bilateral Export Supply and Import Demand in Multi-Country Agri-Food Models
Provedor de dados: 31
Autores: Winter,   Etti Maria; Frohberg,   Klaus.
This paper illustrates the opportunities of incorporating more advanced functional forms into multi-country trade policy models. It suggests the use of flexible forms such as the Symmetric Generalized McFadden Function (SGMF) or the Normalized Quadratic-Quadratic Expenditure System (NQQES). Particularly if issues namely trade in differentiated products, preferential trade and effects of standards and traceability on bilateral trade are considered the NQQES offers attractive properties since it allows estimating variety specific expenditure elasticities which might compensate for example increased certification costs. A second aim of the paper refers to the critique on the handling of model parameters in calibrated policy models. In general, employed...
Tipo: Conference Paper or Presentation
Palavras-chave: Bilateral trade modelling; Flexible functions; Calibration; International Relations/Trade; Research Methods/ Statistical Methods; B41; C61; F13; Q18; Q17.
Ano: 2005
URL: http://purl.umn.edu/24471

Research on Rural Tourism Development Based on the New Policy of Land Circulation
Provedor de dados: 31
Autores: Mei,   Yan; Xiao,   Xiao.
Land reform development in China has experienced three great reforms, and new policy of rural land circulation in new period was an inevitable trend of rural economic development. SWOT analytical method was adopted to study the influences of the new policy on rural tourism development, which led to new opportunities, including developing rural tourism in scale and realizing capitalization of the resources. However, there were many problems and challenges, which were showed in neglecting the guarantee of farmers’ interests and lacking the protection of rural landscape. Hence, the measures for rural tourism development under new situations should be taken as follows. To begin with, it should give full play to government function; secondly, it must strengthen...
Tipo: Thesis or Dissertation
Palavras-chave: Land circulation; SWOT; Development strategy; China; Rural tourism; Community/Rural/Urban Development; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/53603

WHAT ROLE FOR LEUCAENA LEUCOCEPHALA IN MEETING KENYA'S FUELWOOD DEMAND?:A BIOECONOMIC MODEL
Provedor de dados: 31
Autores: Stone,   Steven W.; Kyle,   Steven C.; Conrad,   Jon M.
Shortages of wood for burning and construction have begun to create serious environmental problems in sub-Saharan Africa. Kenya is of particular interest both because of its high population pressure and its commitment to au active reforestation movement. This paper examines the contribution that the fast-growing species, Leucaena leucocephala, can make in this effort. A simple statistical model was used to determine the soil and climatic factors that affect its growth; these results are then compared with existing conditions in Kenya. Estimated coefficients for growth and estimated output prices were used to derive a function relating the present value of net revenue to rotation length. It is demonstrated that the economically optimal rotation is just...
Tipo: Working or Discussion Paper
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/6854

The history of StataQuest
Provedor de dados: 31
Autores: Anagnoson,   J. Theodore.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117497

U.S. Outdoor Recreation Use Values:  A Benefit Transfer Study
Provedor de dados: 31
Autores: Kaval,   Pamela; Loomis,   John B.
Past empirical benefit measures and other information originally obtained through primary data collection can be used for assessing and analyzing current management and policy actions. This use of past valuation information for current policy analysis is called benefit transfer. In this report, we present information from our database of 1239 consumer surplus estimates usable for benefit transfer that we created from our extensive literature review. The outdoor recreation use value database spans from 1967 through 2003 with activities ranging from birdwatching and picnicking to rock climbing and snorkeling. A park manager or other planner could easily use the information from our database to estimate consumer surplus values for a park, region, or activity,...
Tipo: Conference Paper or Presentation
Palavras-chave: Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2004
URL: http://purl.umn.edu/97796

Allocative vs. Technical Efficiency, and Related Matters in Linear Programming
Provedor de dados: 31
Autores: Drynan,   Ross G.
The relationship between technical and allocative efficiency is examined by drawing on concepts of activity dominance in linear programming. The conclusion is reached that there is no fundamental distinction between technical and allocative efficiency. Other topics addressed in the paper, all connected by the common thread of activity dominance, include activity specification and the nature of returns to scale.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1987
URL: http://purl.umn.edu/12351

Choices under Risk in Rural Peru
Provedor de dados: 31
Autores: Galarza,   Francisco B.
This paper estimates the risk preferences of cotton farmers in Southern Peru, using the results from a multiple-price-list lottery game. Assuming that preferences conform to two of the leading models of decision under risk. Expected Utility Theory (EUT) and Cumulative Prospect Theory (CPT) -- we find strong evidence of moderate risk aversion. Once we include individual characteristics in the estimation of risk parameters, we observe that farmers use subjective nonlinear probability weighting, a behavior consistent with CPT. Interestingly, when we allow for preference heterogeneity via the estimation of mixture models -- where the proportion of subjects who behave according to EUT or to CPT is endogenously determined -- we find that the majority of farmers’...
Tipo: Working or Discussion Paper
Palavras-chave: International Development; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2009
URL: http://purl.umn.edu/92247

Confidence intervals and p-values for delivery to the end user
Provedor de dados: 31
Autores: Newson,   Roger.
Statisticians make their living producing confidence intervals and pvalues. However, those in the Stata log are not ready for delivery to the end user, who usually wants to see statistical output either as a plot or as a table. This article describes a suite of programs used to convert Stata results to one or other of these forms. The eclplot package creates plots of estimates with confidence intervals, and the listtex package outputs a Stata dataset in the form of table rows that can be inserted into a plain TeX, LaTeX, HTML, or word processor table. To create a Stata dataset that can be output in these ways, we can use the parmest, dsconcat, and lincomest packages to create datasets with one observation per estimated parameter; the sencode, tostring,...
Tipo: Journal Article
Palavras-chave: Confidence interval; P-value; Plot; Table; Estimation results; TeX; LaTeX; HTML; Word processor; Presentation; Eclplot; Listtex; Parmest; Dsconcat; Lincomest; Sencode; Tostring; Ingap; Reshape; Descsave; Factext; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116091

Analysing Government Decision Making in the South African Biofuels Industry: A Game Theoretic Approach
Provedor de dados: 31
Autores: Funke,   Thomas; Klein,   Peter G.
The production of biofuels in many countries is largely driven by the government strategy and incentives that are in place. In South Africa the first round of the development of such a draft strategy took place in 2005 while the official stance on biofuels was finalized in December of 2007. During the policy development process various governmental departments had strategic goals and targets that they all were required to achieve. The achievement of these strategic targets and goals is also risky and the various departments that have some form of involvement in the biofuels industry need to decide on how much risk they are willing to take. This article sketches the game that the various governmental departments played as well as the risks that they were...
Tipo: Journal Article
Palavras-chave: Biofuels; Game Theory; Government Strategy; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/95979

Application of Chow test to improve analysis of farmer participation in markets in Kenya
Provedor de dados: 31
Autores: Otieno,   David Jakinda; Omiti,   John M.; Nyanamba,   Timothy O.; McCullough,   Ellen B.
Involvement of farmers especially those at the smallholder level, in commercial agriculture is an important pathway towards economic development.  There is a growing literature on the extent and determinants of market participation by farmers in different areas of the world. However, many studies fail to statistically account for the choice of either pooled models or disaggregated analysis of data from multiple sites. The consequence is that the scope and relevance of policy inferences on the basis of those results are limited. This study contributes to knowledge in filling the analytical void through application of the Chow test. Primary data from seventy seven vegetable farmers is analysed to understand factors that influence the level of market...
Tipo: Conference Paper or Presentation
Palavras-chave: Chow test; Rural-urban divide; Market analysis; Policy; Kenya; Agribusiness; Agricultural and Food Policy; Marketing; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/50776

Spatial Agglomeration Degree and Influencing Factors of Main Agricultural Products in Guangdong Province of China
Provedor de dados: 31
Autores: Chen,   Weilian; Zhang,   Hongou; Wang,   Rongrong; Chen,   Jing.
This paper introduces the calculation formula and measure standard of Gini coefficient, and measures the spatial agglomeration degree of main agricultural products in Guangdong Province by Gini coefficient. We also analyze the influencing factors of the agglomeration of main agricultural products in Guangdong Province, and put forward related suggestions.
Tipo: Thesis or Dissertation
Palavras-chave: Guangdong Province; Main agricultural product; Spatial agglomeration degree; Influencing factor; China; Marketing; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods; Teaching/Communication/Extension/Profession.
Ano: 2009
URL: http://purl.umn.edu/53530

AN APPROACH TO THE ECONOMETRIC ESTIMATION OF ATTITUDES TO RISK IN AGRICULTURE
Provedor de dados: 31
Autores: Bardsley,   Peter; Harris,   Michael.
A simple model is developed relating the debt and asset portfolio of the farm to the production decision, which leads to a small non-linear system of equations. The system is estimated with time-series cross-sectional data from Australian broadacre agriculture using non-linear three-stage least squares. This gives a new method of estimating risk aversion coefficients by using actual behaviour of farmers in a realistic economic environment, rather than games played in artificial situations. Australian farmers are found to be risk averse, and the partial coefficient of risk aversion decreases with wealth and increases with income. The results are consistent with the results of studies by Binswanger in India and elsewhere using a completely different method....
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 1987
URL: http://purl.umn.edu/22447

Stata tip 56: Writing parameterized text files
Provedor de dados: 31
Autores: Gini,   Rosa.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120936

FEEDFORWARD NEURAL NETWORK ESTIMATION OF A CROP YIELD RESPONSE FUNCTION
Provedor de dados: 31
Autores: Joerding,   Wayne H.; Li,   Ying; Young,   Douglas L.
Feedforward networks have powerful approximation capabilities without the "explosion of parameters" problem faced by Fourier and polynomial expansions.  This paper first introduces feedforward networks and describes their approximation capabilities, then we address several practical issues faced by applications of feedforward networks.  First, we demonstrate networks can provide a reasonable estimate of a Bermudagrass hay fertilizer response function with the relatively sparse data often available from experiments.  Second, we demonstrate that the estimated network with a practical number of hidden units provides reasonable flexibility.  Third, we show how one can constrain feedforward networks to satisfy a priori information without losing their flexible...
Tipo: Journal Article
Palavras-chave: Biological process models; Feedforward networks; Production function; Neural networks; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/15430

MEASURING THE SUPPLY RESPONSE FUNCTION OF TOBACCO IN ZIMBABWE
Provedor de dados: 31
Autores: Leaver,   Rosemary.
This paper presents an estimate of the price elasticity of supply for tobacco output in Zimbabwe using an adapted Nerlovian model.  The results indicate a short-run elasticity of +0.34 and a long-run elasticity of +0.81, suggesting that tobacco farmers are highly unresponsive to price changes.  These estimates are similar to those obtained for tobacco in supply response studies conducted in other developing African countries.
Tipo: Conference Paper or Presentation
Palavras-chave: Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/19079

An Evaluation of the Soda Tax with Multivariate Nonparametric Regressions
Provedor de dados: 31
Autores: Belasco,   Eric J.; Ghosh,   Sujit K.; Chidmi,   Benaissa.
This research extends past work by Shonkwiler and Yen (1999) by allowing for distributional flexibility and nonlinear responses in the form of established semiparametric and nonparametric regressions. The proposed models are shown to outperform the parametric version typically used in demand analysis to characterize a system of censored equations in terms of model fit and prediction power. Using the developed models, we derive elasticities associated with different individual-specific scenarios with regard to the recently proposed “penny-an-ounce” tax on soft drinks sweetened with sugar.
Tipo: Conference Paper or Presentation
Palavras-chave: Censoring; Health taxes; Nonparametric regressions; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/61329

TOWARD IMPROVED ECONOMIC ANALYSIS USING CONTINGENT VALUATION: SOME METHODOLOGICAL CONSIDERATIONS APPLIED TO RIVER TOXICS AND DAM REMOVAL
Provedor de dados: 31
Autores: Hitzhusen,   Frederick J.; Abdul-Mohsen,   Ashraf; Kruse,   Sarah.
This paper addresses conceptually and empirically some of the biases commonly associated with contingent valuation (CV) elicitation of willingness to pay (WTP) values for non-market goods and services. More specifically, the study focuses on testing for scope, context, and sequence effects in CV mail surveys as well as the assumption of well-defined preferences in mail questionnaires and how this assumption might bias WTP estimates. Our results suggest that the absence of scope effects in the some CV mail surveys might be a result of the complexity or multidimensional aspect of the policy in question (i.e. dredging with and without dam removal) and the assumption that increases in scale of the public good are easier to be comprehended and then translated...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/20326

Stata tip 22: Variable name abbreviation
Provedor de dados: 31
Autores: Ryan,   Philip.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117534

The Organizational Evolution of Markets for Wood Products in the Southern United States
Provedor de dados: 31
Autores: Dunn,   Michael A.; Barnes,   James N.
This paper represents the first case study attempt to develop a transaction cost conceptual model to describe industry evolution of the paper and lumber industries in the Southern United States around the late 1800s and early 1900s. We use transaction cost theory to explain the co-evolution of markets for wood products noting that variation in the level and type of investments made in physical and human capital assets needed to manage paper and lumber miller operations had a significant influence on the use of wood dealer systems compared to more vertically organized business arrangements. We identify some testable hypotheses and areas of future research.
Tipo: Conference Paper or Presentation
Palavras-chave: Industry Evolution; Contracting; Property Rights; Vertical Integration; Forest Products; Industrial Organization; Research Methods/ Statistical Methods; L14; L24; L73; J24.
Ano: 2008
URL: http://purl.umn.edu/6746

The Failure of Strategic Industrial Policies Due to the Manipulation by Firms
Provedor de dados: 31
Autores: Karp,   Larry S.; Perloff,   Jeffrey M.
The strategic effects of subsidies on output and subsidies on investment differ substantially in dynamic models where a government's commitment ability is limited. Output subsidies remain effective even as the period of commitment vanishes, but investment subsidies may become completely ineffective. This difference has been obscured because most existing models of strategic trade policy are static.
Tipo: Working or Discussion Paper
Palavras-chave: Strategic trade policy; Convex adjustment costs; Markov perfect equilibria; International Relations/Trade; Research Methods/ Statistical Methods; 410; 026.
Ano: 1993
URL: http://purl.umn.edu/6052

Sample size calculations for main effects and interactions in case–control studies using Stata's nchi2 and npnchi2 functions
Provedor de dados: 31
Autores: Saunders,   Catherine L.; Bishop,   D. Timothy; Barrett,   Jennifer H.
The non-central chi-squared distribution can be used to calculate power for tests detecting departure from a null hypothesis. Required sample size can also be calculated because it is proportional to the non-centrality parameter for the distribution. We demonstrate how these calculations can be carried out in Stata using the example of calculating power and sample size for case–control studies of gene–gene and gene–environment interactions. Do-files are available for these calculations.
Tipo: Journal Article
Palavras-chave: Gene–environment interaction; Gene–gene interaction; Power; Sample size; Study design; Non-central chi^2; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116031

RETURNS TO SCALE AND SIZE IN AGRICULTURAL ECONOMICS: COMMENT
Provedor de dados: 31
Autores: Fare,   Rolf.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1988
URL: http://purl.umn.edu/32151

Toward an Agricultural Policy Monitoring System (APMS)
Provedor de dados: 31
Autores: De Benedictis,   Michele.
This working paper focuses on a subject of special relevance for agricultural policy reforms: the establishment of an Agricultural Policy Monitoring System.
Tipo: Working or Discussion Paper
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/48897

Stata at 20: a personal view
Provedor de dados: 31
Autores: Royston,   Patrick.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117498

Measuring Regional Productivity Differences in the Australian Wool Industry: A Metafrontier Approach
Provedor de dados: 31
Autores: Villano,   Renato A.; Fleming,   Euan M.; Fleming,   Pauline.
Using panel data, we estimate technology gaps for four distinct sheep-producing regions in Eastern Australia (Northern New South Wales, Central and South-Eastern New South Wales, South-Western New South Wales and South-West Victoria) that reflect spatial environmental and technological differences in wool production. A deterministic stochastic metafrontier production function model is estimated that envelops the stochastic frontiers of the four regions. This metafrontier approach enables us to estimate the environment-technology gap ratio that reflects these spatial differences in the environment and variations in production technologies in the wool enterprise for benchmarked farmers in each region. As a result, a more accurate estimation is possible of...
Tipo: Conference Paper or Presentation
Palavras-chave: Efficiency; Productivity; Metafrontier; Technology Gaps; Wool Production; Spatial; Livestock Production/Industries; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6036

QUALITY PREMIUMS FOR AUSTRALIAN WHEAT IN THE GROWING ASIAN MARKETS
Provedor de dados: 31
Autores: Ahmadi-Esfahani,   Fredoun Z.; Stanmore,   Roland G.
An hedonic price function is applied to Australia's wheat exports to the growing Asian markets. The values for the quality characteristics in the wheat markets of Indonesia, Malaysia, Singapore, South Korea, and Thailand are estimated. The data base for the study is from the Australian Wheat Board shipments over the period 1984 to 1991. The sample is divided into two separate time periods to test the consistency in demand for export wheat and to trace recent trends in quality premiums. The implications of the results for wheat marketing and trade are explored.
Tipo: Journal Article
Palavras-chave: Marketing; Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/22731

El sector agricola peruano y sus interrelaciones con el entorno macroeconomico: un modelo econometrico
Provedor de dados: 31
Autores: Briceno Lira,   Arturo.
Este documento plantea un modelo econométrico que permite cuantificar y simular el impacto de las políticas macroeconómicas sobre el desempeño agrícola de los principales cultivos de la agricultura nacional, clasificados en importables (trigo, arroz y maíz amarillo duro), exportables (café, algodón y azúcar) y no transables (papa). Una de las principales características del modelo es el uso de especificaciones econométricas dinámicas basadas en modelos de corrección de error para variables cointegradas.
Tipo: Working or Discussion Paper
Palavras-chave: Sector agropecuario; Modelos econometricos; Agricultural sector; Econometric models; Peru; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q10; C50.
Ano: 1991
URL: http://purl.umn.edu/42260

A two-stage productivity analysis using bootstrapped Malmquist index and quantile regression
Provedor de dados: 31
Autores: Kaditi,   Eleni A.; Nitsi,   Elisavet I.
This paper examines the effects of farm characteristics and government policies in enhancing productivity growth for a sample of Greek farms, using a two-stage procedure. In the 1st-stage, non-parametric estimates of Malmquist index and its decompositions are computed, while a bootstrapping procedure is applied to provide their statistical precision. In the 2nd-stage, the productivity growth estimates are regressed on various covariates using a bootstrapped quantile regression approach. The effect that the covariates exert on productivity growth of the average producer is analyzed, as well as the marginal effect of a given covariate for individuals at different points in the conditional productivity distribution. The results indicate that there exists...
Tipo: Conference Paper or Presentation
Palavras-chave: Malmquist productivity index; Quantile regression; Bootstrap; Research Methods/ Statistical Methods; C14; C21; D24.
Ano: 2009
URL: http://purl.umn.edu/52845

SPLINE FUNCTIONS: THEIR USE IN ESTIMATING NON-REVERSIBLE RESPONSE
Provedor de dados: 31
Autores: Groenewegen,   John.
The Objectives of this paper are: (1) to introduce the concept of spline functions; and (2) to account for complete and partial non-reversibility with spline functions. This paper illustrates this approach using a supply response example.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1979
URL: http://purl.umn.edu/13423

ANALYSIS OF THE ROMANIAN AGRICULTURE IN THE PERIOD OF TRANSITION, BASED ON THE NATIONAL ACCOUNTS
Provedor de dados: 31
Autores: Vincze,   Maria-Magdolna; Madaras,   Szilard.
The purpose of this paper is to present the changes occurred during the transition period in the role and place of agriculture in the Romanian economy. The main methodological instruments used are the national Input-Output Tables for 1999-2004 published in the National Accounts. We have also used figures from the Regional Accounts to put into evidence regional differences in total GDP and the GDP of agriculture. Input-Output analysis is an analytical tool recognized as one of the most significant contributions to the economic theory and applications, but rarely used in agricultural economics for quantifying the structural changes of the economic activities. The first part of the paper presents the general equilibrium situation of the Romanian economy and...
Tipo: Book
Palavras-chave: Input-Output model; Economic activities structures; Regional differences; Impact of the new agricultural policy; Agricultural and Food Policy; Community/Rural/Urban Development; International Development; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/43191

Valuing Consumer Preferences with the CUB Model: A Case Study of Fair Trade Coffee
Provedor de dados: 31
Autores: Cicia,   Gianni; Corduas,   Marcella; Del Giudice,   Teresa; Piccolo,   Domenico.
D'Elia and Piccolo (2005) have recently proposed a mixture distribution, named CUB, for ordinal data. The use of such a mixture distribution for modelling ratings is justified by the following consideration: the judgment that a subject expresses is the result of two components, uncertainty and selectiveness. The possibility of relating the parameters of CUB models to covariates makes the formulation interesting for practical applications In this case study, a sample of 224 fair‐trade coffee consumers were interviewed at stores. With this data‐set, CUB model split consumers, according to their preferences, in two different segments: one showing high price elasticity, and one with a low price elasticity. As regards the potential of the CUB model, it showed a...
Tipo: Journal Article
Palavras-chave: CUB model; Fair trade coffee; Latent class choice model; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/91144

Durabilité des systèmes de production des petits ruminants: Une approche de santé  animale–marketing
Provedor de dados: 31
Autores: Zaibet,   Lokman; Abdelhafidh,   Hassen.
L’objectif de ce papier est d’identifier les contraintes de commercialisation des petits ruminants sur le marché aux bestiaux.  Ces contraintes sont particulièrement prononcées chez les petits éleveurs. Notre recherche met en évidence la relation entre les caractéristiques de cette catégorie d’éleveurs et le choix du lieu de commercialisation (marché, sur la route ou à la ferme).  Ce choix est lié aussi aux coûts de transaction qui se manifestent sur le marché mais aussi à l’état de santé du cheptel.  La décision de ne pas se rendre sur le marché est supposée influencer négativement la continuité de cette activité et par conséquent la durabilité de d’élevage chez les petits éleveurs. Parmi les facteurs trouvés favoriser la chance de se rendre sur le marché...
Tipo: Conference Paper or Presentation
Palavras-chave: Agricultural and Food Policy; Community/Rural/Urban Development; Demand and Price Analysis; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; International Relations/Trade; Marketing; Productivity Analysis; Research and Development/Tech Change/Emerging Technologies; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/52006

RECENT APPLICATIONS OF NONPARAMETRIC PROGRAMMING METHODS
Provedor de dados: 31
Autores: Lee,   Hyunok.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992
URL: http://purl.umn.edu/29007

Understanding the multinomial-Poisson transformation
Provedor de dados: 31
Autores: Guimaraes,   Paulo de Freitas.
There is a known connection between the multinomial and the Poisson likelihoods. This, in turn, means that a Poisson regression may be transformed into a logit model and vice versa. In this paper, I show the data transformations required to implement this transformation. Several examples are used as illustrations.
Tipo: Journal Article
Palavras-chave: Poisson regression; Logit; Conditional logit; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116247

Participatory rural appraisal for irrigation management research: lessons from IIMI's experience
Provedor de dados: 31
Autores: Gosselink,   Paul; Strosser,   Pierre.
The increasing international awareness about the strengths of participatory approaches and methods for research and development has led international development banks, NGOs, donors and research and training institutes to adopt Participatory Rural Appraisal (PRA) and other participatory approaches to implement new projects and programs. At IIMI, PRA approaches and methods have also been incorporated in a number of research activities. The present Working Paper explores the opportunities of PRA in irrigation management research through an analysis of selected case studies in which IIMI attempted to practice the PRA approach.
Tipo: Working or Discussion Paper
Palavras-chave: Irrigation management; Participatory management; Participatory rural appraisal; Research methods; Farmer managed irrigation systems; Watersheds; Performance indexes; Water users; Case studies; Farm Management; Research Methods/ Statistical Methods.
Ano: 1995
URL: http://purl.umn.edu/113606

From the help desk
Provedor de dados: 31
Autores: McDowell,   Allen.
Welcome to From the help desk. From the help desk is written by the people in Technical Services at StataCorp and deals with issues that they have found to be of concern to a large fraction of Stata users. It is the rare column in this series that deals with sophisticated programming issues because such issues, by definition, are not of concern to a large fraction of Stata users. From the help desk discusses the use of sophisticated programs and the use of sophisticated statistics.
Tipo: Journal Article
Palavras-chave: Internet; Web; Ado-files; Stata executable installation; Updates; Downloading; User-written additions; Packages; Search; Find; Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/115937

CONGESTION MODELS WITH CONSISTENT CONJECTURES
Provedor de dados: 31
Autores: Holloway,   Garth J.
This paper demonstrates that, in situations in which a cumulative externality exists, the basic nature and extent of resource misallocation may be substantially less than we imagine. This conclusion stems from deriving consistent conjectures in a unified framework in which congestion is present. Experiments support the conclusion that, when numbers of agents are small, when there is little heterogeneity among them, and when they have the opportunity to observe each other during repeated experiment, the market allocation may be efficient.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/22372

Is there a future for small farms in developed countries? Evidence from the French case
Provedor de dados: 31
Autores: Perrier-Cornet,   Philippe; Aubert,   Magali.
This research aims to identify the specific characteristics of small farms in developed countries and the factors which influence their survival and growth. Using the case of France, we employ statistical and econometric analysis of data from the Farm Structure Survey (N=70,000) for the period 2000-2007. The principal findings suggest that small farms are no more likely than other farms to employ “alternative” strategies to the predominant model of increasing farm size, nor are they more likely to diversify on-farm activities or operate under quality-labelled production systems, with the notable exception of organic agriculture. However, where small farms do adopt or practice these activities, they are seen to have a favourable effect in ensuring their...
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/52855

Characterizing the female entrepreneur: Comparing behavior in a market entry experiment with other groups of individuals
Provedor de dados: 31
Autores: Schade,   Christian; Boewe,   Sabrina; Krause,   Kai Oliver.
We investigate the strategic decision behavior of female entrepreneurs in a realistic market entry experiment where individuals started with gains or losses experienced prior to the game. We compare the entry behavior of female entrepreneurs to the entry behavior of male entrepreneurs and to the entry behavior of female and male students. We find that female entrepreneurs show entry patterns very similar to that of male entrepreneurs and very different from female students: female entrepreneurs on average over enter markets and do not react to their opponents’ prior experiences much. The same accounts for male entrepreneurs. Furthermore, we find that entrepreneurs in general exhibit significantly higher mean entry probabilities than students, whereby...
Tipo: Working or Discussion Paper
Palavras-chave: Female Entrepreneurship; Strategic Decision Behavior; Market Entry; Experimental Economics; Agribusiness; Agricultural and Food Policy; Agricultural Finance; Consumer/Household Economics; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/59520

Structural Change via Threshold Effects:  Estimating U.S. Meat Demand Using Smooth Transition Functions
Provedor de dados: 31
Autores: Rodriguez,   Nestor; Eales,   James S.
Structural change remains a contentious issue in the literature. This study focuses on analyzing structural change in consumer demand for meats, which are modeled over the past half century. A standard inverse demand model is combined with a variant of the Smooth Transition Autoregressive (STAR) model. Results indicate that structural change has occurred and that con- sumers' preferences for meat are sensitive to in ation.
Tipo: Presentation
Palavras-chave: Food demand; Econometrics; Meat demand; Applied Microeconomics; Time Series; Agribusiness; Consumer/Household Economics; Demand and Price Analysis; Research Methods/ Statistical Methods.
Ano: 2012
URL: http://purl.umn.edu/124366

Review of Statistical Modeling for Biomedical Researchers by Dupont
Provedor de dados: 31
Autores: Garrett,   Joanne M.
This article reviews Statistical Modeling for Biomedical Researchers by Dupont.
Tipo: Journal Article
Palavras-chave: Biostatistics; Research Methods/ Statistical Methods.
Ano: 2003
URL: http://purl.umn.edu/116076

TARGETING “REAL FARMERS” WITH REFORMED CAP PAYMENTS: AN ANALYSIS FOR ITALY
Provedor de dados: 31
Autores: Rocchi,   Benedetto.
A multi-sector model is used to assess the targeting of CAP payments in Italy, according with alternative definitions of the “real farmers” institutional sector. The model is based on a Social Accounting Matrix of the Italian economy, properly adapted to represent the process of income formation and distribution in agriculture. The accounting framework has been integrated with a set of microeconomic information from the Farm Business Survey, a sample of agricultural holdings representative of the whole industry in Italy. The effects of changes in CAP payments have been assessed through a process in which impacts moves from the micro to the macro module of the model and return, in an iterative way. A vector of final income increase for each household...
Tipo: Conference Paper or Presentation
Palavras-chave: Common Agricultural Policy; Targeting; Income distribution; Social accounting matrix; Agricultural and Food Policy; Research Methods/ Statistical Methods; Q18 agricultural policy; D57 input-output tables and analysis; D30 distribution general.
Ano: 2008
URL: http://purl.umn.edu/44817

MODELING OF NONLINEAR FUNCTIONS INTO A LINEAR PROGRAMMING FORMAT
Provedor de dados: 31
Autores: Roe,   Terry L.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1975
URL: http://purl.umn.edu/13931

House Price Prediction: Hedonic Price Model vs. Artificial Neural Network
Provedor de dados: 31
Autores: Limsombunchai,   Visit.
The objective of this paper is to empirically compare the predictive power of the hedonic model with an artificial neural network model on house price prediction. A sample of 200 houses in Christchurch, New Zealand is randomly selected from the Harcourt website. Factors including house size, house age, house type, number of bedrooms, number of bathrooms, number of garages, amenities around the house and geographical location are considered. Empirical results support the potential of artificial neural network on house price prediction, although previous studies have commented on its black box nature and achieved different conclusions.
Tipo: Conference Paper or Presentation
Palavras-chave: Hedonic Model; Artificial Neural Network (ANN); House Price.; Environmental Economics and Policy; Land Economics/Use; Research Methods/ Statistical Methods; C53; L74.
Ano: 2004
URL: http://purl.umn.edu/97781

Speaking Stata: Graphs for all seasons
Provedor de dados: 31
Autores: Cox,   Nicholas J.
Time series showing seasonality—marked variation with time of year—are of interest to many scientists, including climatologists, other environmental scientists, epidemiologists, and economists. The usual graphs plotting response variables against time, or even time of year, are not always the most effective at showing the fine structure of seasonality. I survey various modifications of the usual graphs and other kinds of graphs with a range of examples. Although I introduce here two new Stata commands, cycleplot and sliceplot, I emphasize exploiting standard functions, data management commands, and graph options to get the graphs desired.
Tipo: Journal Article
Palavras-chave: Cycleplot; Sliceplot; Seasonality; Time series; Graphics; Cycle plot; Rotation; State space; Incidence plots; Folding; Repeating; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117590

Historical Development and Applications of the EPIC and APEX Models
Provedor de dados: 31
Autores: Gassman,   Philip W.; Williams,   Jimmy R.; Benson,   Verel W.; Izaurralde,   R. Cesar; Hauck,   Larry M.; Jones,   C. Allan; Atwood,   Jay D.; Kiniry,   James R.; Flowers,   Joan D.
The development of the field-scale Erosion Productivity Impact Calculator (EPIC) model was initiated in 1981 to support assessments of soil erosion impacts on soil productivity for soil, climate, and cropping conditions representative of a broad spectrum of U.S. agricultural production regions. The first major application of EPIC was a national analysis performed in support of the 1985 Resources Conservation Act (RCA) assessment. The model has continuously evolved since that time and has been applied for a wide range of field, regional, and national studies both in the U.S. and in other countries. The range of EPIC applications has also expanded greatly over that time, including studies of (1) surface runoff and leaching estimates of nitrogen and...
Tipo: Working or Discussion Paper
Palavras-chave: APEX; Carbon sequestration; Climate change; EPIC; Modeling; Soil erosion; Water quality; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/18372

ALTERNATIVE FUTURES OF RURAL AREAS IN THE EU: A COMPARATIVE ANALYSIS OF SCENARIO STUDIES
Provedor de dados: 31
Autores: Jansson,   Kristina M.; Terluin,   Ida J.
What does rural Europe look like in 2030? Is agriculture still the main land user? In recent years, studies such as ESPON, Eururalis, SCENAR2020, SENSOR, SEAMLESS and PRELUDE have tried to address these questions. These studies resulted in a number of alternative futures of rural areas in the EU. In this paper a comparative analysis of these scenario studies is made in order to explore differences and similarities in the scenarios and alternative futures of rural areas in the EU. For this purpose, we designed a scheme for assessing the properties of the various scenarios and a scheme for a systematic description of the rural futures according to the scenarios. It appears that most scenario studies use a baseline scenario and a set of alternative scenarios...
Tipo: Conference Paper or Presentation
Palavras-chave: Rural Europe; Scenario studies; Alternative futures; Land-use; Territorial disparities; Agribusiness; Community/Rural/Urban Development; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/57506

DYNAMIC MICROECONOMETRIC APPROACHES TO ANALYSING AGRICULTURAL POLICY
Provedor de dados: 31
Autores: Gardebroek,   Cornelis; Oude Lansink,   Alfons G.J.M.
Micro-econometric models have become a standard and powerful tool in analysing agricultural policies. In this paper we assess the contributions that have been made in the agricultural economics literature to dynamic microeconometric models of firms and households that are estimated using microdata. After discussing developments in dynamic investment models, dynamic household models, dynamic discrete choice models and dynamic efficiency models we give promising directions for future research and discuss implications for future data collection.
Tipo: Conference Paper or Presentation
Palavras-chave: Dynamics; Microeconometric models; Agricultural policy analysis; Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6592

The impact of property rates on agricultural land, focusing on Limpopo
Provedor de dados: 31
Autores: Reynolds,   Sanri; van Schoor,   Melt.
Municipalities across the country are in the process of implementing property rates on all property, following the Local Government: Property Rates Act (2004) that came into effect on 1 July 2005.  This study investigates the economic impact of property rates on agricultural land, using a static computable general equilibrium model. The direct and indirect effects of property rates on the macro-economy, factor incomes, household welfare, prices and agricultural output are discussed. The results indicate that the impact of raising property rates depends on the use made of the additional revenue by government. There is a small negative impact on the economy and the overall welfare of households decline if government spends the additional revenue. On the...
Tipo: Working or Discussion Paper
Palavras-chave: Computable General Equilibrium Models; Research Methods/ Statistical Methods; C68.
Ano: 2006
URL: http://purl.umn.edu/58071

Using Participatory Research Methods in Economic Research
Provedor de dados: 31
Autores: MacDonald,   Darla Hatton; Weber,   Marian.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1998
URL: http://purl.umn.edu/24109

Pricing Fed Cattle on a Grid: An Analysis of the Incentive Mechanism over Time
Provedor de dados: 31
Autores: Fausti,   Scott W.; Wang,   Gerald; Diersen,   Matthew A.; Qasmi,   Bashir A.
Empirical results suggest that the grid premium and discount structure is slowly adjusting carcass quality incentive/disincentive market signals to encourage marketing on a grid and discourage marketing by the pen. If this trend continues, grid market share of steer and heifer slaughter volume should increase in the future.
Tipo: Presentation
Palavras-chave: Fed cattle; Grid; Marketing; Market share; Livestock production; Livestock Production/Industries; Marketing; Research Methods/ Statistical Methods; Q13.
Ano: 2012
URL: http://purl.umn.edu/119670

Speaking Stata: Graphing categorical and compositional data
Provedor de dados: 31
Autores: Cox,   Nicholas J.
A variety of graphs have been devised for categorical and compositional data, ranging from widely familiar to more unusual displays. Both official Stata commands and user-written programs are available. After a stacking trick for binary responses is explained, bar charts and related displays for cross-tabulations are discussed in detail. Tips and tricks are introduced for plotting cumulative distributions of graded (ordinal) data. Triangular plots are explained for three-way compositions, such as three proportions or percentages.
Tipo: Journal Article
Palavras-chave: Graphics; Categorical data; Binary data; Nominal data; Ordinal data; Grades; Compositional data; Cross-tabulations; Bar charts; Cumulative distributions; Logit scale; Catplot; Tabplot; Tableplot; Distplot; Mylabels; Triplot; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116238

An Economic Evaluation of Adoption of the Conservation Compliance Program: A Stochastic Dominance Approach
Provedor de dados: 31
Autores: Govindasamy,   Ramu; Cochran,   Mark J.
Using stochastic dominance, this paper examines the adoption of the Conservation Compliance Program (CCP) in twelve Iowa soil types. Subsidies necessary to compensate producers for the increased risk of compliance strategies are estimated. Results indicate that to promote voluntary compliance with the CCP, the government should provide a subsidy of between $4.55 to $19.88 per acre, depending on the soil type.
Tipo: Journal Article
Palavras-chave: Conservation compliance; Stochastic dominance; Adoption; Risk premium; Erosion; Agribusiness; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1997
URL: http://purl.umn.edu/90409

IS EQUITY A CONSTRAINT? APPLICATIONS TO BLOCK RATE AND OTHER PRICING SCHEMES WITH HETEROGENEOUS USERS
Provedor de dados: 31
Autores: Schoengold,   Karina; Zilberman,   David.
In this paper, we model the trade-off between equity and efficiency in a market for a resource when users of that resource are heterogeneous. We develop the analytical model, and show that under certain circumstances efficiency can be achieved in a manner that also reduces inequality. We also illustrate these results through the use of simulation methods.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/19945

Updating an input-output table for use in policy analysis
Provedor de dados: 31
Autores: Buetre,   Benjamin L.; Ahmadi-Esfahani,   Fredoun Z.
The long lag in the publication of input–output tables is one of the central constraints in applied general equilibrium analysis. Model builders often use out‐dated databases leading to analyses that are inappropriate for the policy questions being addressed. This occurs particularly when there exists a significant structural change in the economy. We discuss the updating of an input–output table of the Philippines by simulation technique. A detailed computable general equilibrium model of the Philippine economy with comparative static and forecasting capabilities is utilised. The data are drawn from known percentage changes of macroeconomic variables such as those in the national accounts and structural variables such as employment and output by industry.
Tipo: Journal Article
Palavras-chave: Agricultural and Food Policy; Research Methods/ Statistical Methods.
Ano: 2000
URL: http://purl.umn.edu/117853

Organic and Conventional Vegetable Production in Oklahoma
Provedor de dados: 31
Autores: Khanal,   Kalpana; Henneberry,   Shida Rastegari; Taylor,   Merritt J.; Schatzer,   Raymond Joe; Epplin,   Francis M.; Roberts,   B. Warren; Edelson,   Jonathan V.; Shrefler,   Jim.
This study compares he profitability and risk related to conventional and organic vegetable production systems A linear programming model was used to find the optimal mix of vegetables in both production systems. And a target MOTAD (minimization of total absolute deviation) model was used to perform risk analysis in both organic and conventional production systems
Tipo: Conference Paper or Presentation
Palavras-chave: Crop Production/Industries; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6789

REPORTING RESPONSE RATES FOR TELEPHONE SURVEYS USED IN AGRICULTURAL ECONOMICS RESEARCH
Provedor de dados: 31
Autores: Gripp,   Sharon I.; Luloff,   A.E.; Yonkers,   Robert D.
Response rates are one indicator of a survey's data quality, as a great deal of importance has been placed on the mail survey's response rate.  However, a telephone survey's response rate usually is not reported.  Even if one is reported, the numbers used in the calculation are rarely defined making the response rate interpretation unclear.  Using a recent telephone survey of Pennsylvania dairy managers, this paper demonstrates how telephone survey data should be reported.  Essentially, every research report should include a discussion of how the survey was conducted, a disposition table, and well-defined formulas used to calculate response rates.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1994
URL: http://purl.umn.edu/31439

Indicators
Provedor de dados: 31
Autores: Capehart,   Thomas C., Jr.; Shane,   Mathew.
Tipo: Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/121906

Characterizing Spatial Pattern in Ecosystem Service Values when Distance Decay Doesn’t Apply: Choice Experiments and Local Indicators of Spatial Association
Provedor de dados: 31
Autores: Johnston,   Robert J.; Ramachandran,   Mahesh; Schultz,   Eric T.; Segerson,   Kathleen; Besedin,   Elena Y.
Stated preference analyses commonly impose strong and unrealistic assumptions in response to spatial welfare heterogeneity. These include spatial homogeneity or continuous distance decay. Despite their ubiquity in the valuation literature, global assumptions such as these have been increasingly abandoned by non-economics disciplines in favor of approaches that allow for spatial patchiness. This paper develops parallel methods to evaluate local patchiness and hot spots in stated preference welfare estimates, characterizing relevant patterns overlooked by traditional approaches.  The analysis draws from a choice experiment addressing river restoration. Results demonstrate shortcomings in standard treatments of spatial heterogeneity and insights available...
Tipo: Conference Paper or Presentation
Palavras-chave: Willingness to Pay; Hot Spot; Stated Preference; Ecosystem Service; Valuation; Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 2011
URL: http://purl.umn.edu/103374

Greenhouse Gas Impacts of Ethanol from Iowa Corn: Life Cycle Analysis versus System-wide Accounting
Provedor de dados: 31
Autores: Feng,   Hongli; Rubin,   Ofir D.; Babcock,   Bruce A.
Life cycle analysis (LCA) is the standard approach used to evaluate the greenhouse gas (GHG) benefits of biofuels. However, it is increasingly recognized that LCA results do not account for some impacts—including land use changes—that have important implications on GHGs. Thus, an alternative accounting system that goes beyond LCA is needed. In this paper, we contribute to the literature by laying out the basics of a system-wide accounting (SWA) method that takes into account all potential changes in GHGs resulting from biofuel expansion. We applied both LCA and SWA to assess the GHG impacts of ethanol based on Iowa corn.  Growing corn in rotation with soybeans generated 35% less GHG emissions than growing corn after corn. Based on average corn production,...
Tipo: Working or Discussion Paper
Palavras-chave: Biofuels; Corn ethanol; Greenhouse gas; Life cycle analysis; System-wide accounting; Crop Production/Industries; Land Economics/Use; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/6312

Designing an effective evaluation model for the South African Department of Agriculture
Provedor de dados: 31
Autores: Madzivhandila,   T.P.; Griffith,   Garry R.; Fleming,   Euan M.
Governments are under increasing pressure to deliver results. Therefore, it is important to evaluate the effectiveness, efficiency and relevance of the public service in implementing policies and programmes for social betterment. Without such evaluations, it is difficult to ensure that evidence is integrated into policy and used in practice due to lack of generalizability and learning. This paper focuses on (1) the knowledge that is relevant to understand evaluation influence, (2) the possible conceptual frameworks that enable understanding of the evaluation implementation process, (3) possible models of the process of organizational evaluation, and (4) the main ways of intervening to increase influence. The context for analysis is the South African...
Tipo: Conference Paper or Presentation
Palavras-chave: Evaluation; Evaluation Influence; Policy; Programmes; South Africa; Political Economy; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/5983

MODEL SELECTION CRITERIA USING LIKELIHOOD FUNCTIONS AND OUT-OF-SAMPLE PERFORMANCE
Provedor de dados: 31
Autores: Norwood,   F. Bailey; Ferrier,   Peyton Michael; Lusk,   Jayson L.
Model selection is often conducted by ranking models by their out-of-sample forecast error. Such criteria only incorporate information about the expected value, whereas models usually describe the entire probability distribution. Hence, researchers may desire a criteria evaluating the performance of the entire probability distribution. Such a method is proposed and is found to increase the likelihood of selecting the true model relative to conventional model ranking techniques.
Tipo: Conference Paper or Presentation
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2001
URL: http://purl.umn.edu/18947

THE ABROGATION OF SET ASIDE AND THE INCREASE OF CEREAL PRICES: CAN THEY REVERT THE DECLINE OF CEREAL PRODUCTION GENERATED BY DECOUPLING?
Provedor de dados: 31
Autores: Severini,   Simone; Valle,   Stefano.
The decoupling of direct payments, caused by the introduction of the Single Payment Scheme (SPS), has generated an incentive for farmers to decrease the production of cereals, oilseeds and protein crops (COP) and (because of the reform of sugar CMO) sugar beet. In some cases, this has also provided a strong enough incentive for farmers to let some of the available land uncultivated in the years immediately following the introduction of the SPS. However, in the last few years, cereal prices have sharply increased under the pressure of a growing world demand. Under this situation, the EU Commission has abrogated the set aside requirement allowing the cultivation on idle land. In this way the Commission intends to allow EU farmers to take advantage of the new...
Tipo: Conference Paper or Presentation
Palavras-chave: CAP; Decoupling; Set Aside; Cereal Prices; PMP; Farmers behaviour.; Agricultural and Food Policy; Crop Production/Industries; Political Economy; Research Methods/ Statistical Methods; Q10; Q18.
Ano: 2008
URL: http://purl.umn.edu/44782

Participatory action research: strengthening farmer organizations and agency-farmer relations
Provedor de dados: 31
Autores: Wijayaratna,   C.M.; Valdez,   Delia M.
Tipo: Book
Palavras-chave: Irrigation management; Irrigation systems; Agricultural development; Farmer-agency interactions; Operations; Maintenance; Performance evaluation; Institution building; Farmers associations; Training; Research methods; Privatization; Farm Management; Institutional and Behavioral Economics; Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/113711

Systems Analysis and Simulation: A Survey of Applications in Agricultural and Resource Economics
Provedor de dados: 31
Autores: Johnson,   Stanley R.; Rausser,   Gordon C.
Tipo: Book
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1977
URL: http://purl.umn.edu/95726

Linear Programming - An Example
Provedor de dados: 31
Autores: McFarlane,   G.C.; Dillon,   John L.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1956
URL: http://purl.umn.edu/8930

Consistency of Empirical Likelihood and Maximum A-Posteriori Probability Under Misspecification
Provedor de dados: 31
Autores: Grendar,   Marian; Judge,   George G.
Using a large deviations approach, Maximum A-Posteriori Probability (MAP) and Empirical Likelihood (EL) are shown to possess, under misspecification, an exclusive property of Bayesian consistency. Under conditions of consistency, regardless of prior the MAP estimator asymptotically coincides with EL. The consistency property is also studied for sampling processes other than iid.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/6053

Unbalanced Nested Component Error Model and the Value of Soil Insecticide and Bt Corn for Controlling Western Corn Rootworm
Provedor de dados: 31
Autores: Yang,   Juan; Mitchell,   Paul D.; Gray,   Michael E.; Steffey,   Kevin L.
We describe four recently developed panel data estimators for unbalanced and nested data, a common problem for economic and experimental data. We estimate a western corn rootworm damage function with each estimator, including separate parameters for random effects from year, location, and experimental errors. We then use each estimator to assess the cost of the western corn rootworm soybean variant and the net benefit of soil insecticide and Bt corn for controlling this pest. At current prices, we find that soil insecticide generates a net loss ranging about $0.50-$3.25/ac, while Bt corn generates a net benefit ranging $2.50-$7.00/ac.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2007
URL: http://purl.umn.edu/92127

Estimation of supply response in CAPRI
Provedor de dados: 31
Autores: Jansson,   Torbjorn.
The primary objective of this paper is to estimate behavioural parameters of the quadratic regional supply models in the modelling system CAPRI, using the time series data in the CAPRI database. A secondary objective is to replace the constant yields of the original model by functions that depend on input use. Due to lack of statistical robustness, the second objective is not achieved, thus yields remain constant. A Bayesian highest posterior density estimator is developed to address the primary objective. After discarding regions with insufficient data, parameters for up to 23 crop production activities with related inputs, outputs, prices and behavioural functions are estimated for 165 regions in EU-15. The results are systematically compared to the...
Tipo: Working or Discussion Paper
Palavras-chave: Bayesian estimation; Errors-in-variables; PMP; Research Methods/ Statistical Methods; Q11; C32.
Ano: 2007
URL: http://purl.umn.edu/57030

Cow-Calf Farm Management: Farm survey evidence from 2007
Provedor de dados: 31
Autores: Nehring,   Richard F.; Peel,   Derrell S.; Nulph,   David.
This study describes and compares cow-calf operations and assesses their relative competitiveness, developing performance measures for a sample of U.S. farms. We find that larger operations tend to be significantly more scale and technically efficient than smaller operations.  However, we do not find significant differences in net farm returns by size except on medium large operations—showing virtually no net return on farm assets in 2007. While larger operations are clearly more scale and technically efficient and have lower variable costs per cow, off-farm income makes smaller operations competitive as reflected in higher household returns than all size groups--except for very large cow-calf operations.
Tipo: Conference Paper or Presentation
Palavras-chave: Cow-calf; Performance measures; Technical efficiency; Farm Management; Production Economics; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/46672

Climate change risk and response
Provedor de dados: 31
Autores: Kahrl,   Fredrich; Roland-Holst,   David W.
Tipo: Working or Discussion Paper
Palavras-chave: Energy; Sustainability; Climate change; Risk; Economic conditions; Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2008
URL: http://purl.umn.edu/46721

Parametric frailty and shared frailty survival models
Provedor de dados: 31
Autores: Gutierrez,   Roberto G.
Frailty models are the survival data analog to regression models, which account for heterogeneity and random effects. A frailty is a latent multiplicative effect on the hazard function and is assumed to have unit mean and variance θ, which is estimated along with the other model parameters. A frailty model is an heterogeneity model where the frailties are assumed to be individual- or spell-specific. A shared frailty model is a random effects model where the frailties are common (or shared) among groups of individuals or spells and are randomly distributed across groups. Parametric frailty models were made available in Stata with the release of Stata 7, while parametric shared frailty models were made available in a recent series of updates. This article...
Tipo: Journal Article
Palavras-chave: Parametric survival analysis; Frailty; Random effects; Overdispersion; Heterogeneity; Research Methods/ Statistical Methods.
Ano: 2002
URL: http://purl.umn.edu/115948

Stata: The language of choice for time-series analysis?
Provedor de dados: 31
Autores: Baum,   Christopher F.
This paper discusses the use of Stata for the analysis of time series and panel data. The evolution of time-series capabilities in Stata is reviewed. Facilities for data management, graphics, and econometric analysis from both official Stata and the user community are discussed. A new routine to provide moving-window regression estimates—rollreg—is described, and its use illustrated.
Tipo: Journal Article
Palavras-chave: Time-series analysis; Time-series data; Time-series modeling; Moving-window regression; Rolling regression; Research Methods/ Statistical Methods.
Ano: 2005
URL: http://purl.umn.edu/117499

Measuring the Impacts of Improving Research Capacity: The Case of Training in Wheat Disease Resistance
Provedor de dados: 31
Autores: Brennan,   John P.; Quade,   Kathryn J.
It is notoriously difficult to assess the economic value of research aimed at improving research capacity, particularly in enhancing human capital. In this paper, a framework is developed and an analysis is undertaken of the value of training for scientists in wheat rust resistance in India. The value of the training is assessed through marginal analysis of the improvement in the level of disease resistence flowing from the increased capacity. On that basis, the value of programs to build human capacity through training or further education can be estimated. While such estimates need to be highly qualified, they provide a basis for quantifying the value of R&amp;D capacity building.
Tipo: Conference Paper or Presentation
Palavras-chave: Capacity building; Training; Economic; Rust; Wheat; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/58379

REJOINDER: AN APPROACH TO THE ECONOMETRIC ESTIMATION OF ATTITUDES TO RISK IN AGRICULTURE
Provedor de dados: 31
Autores: Bardsley,   Peter; Harris,   Michael.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1991
URL: http://purl.umn.edu/22623

Testing construct validity of verbal versus numerical measures of preference uncertainty in contingent valuation
Provedor de dados: 31
Autores: Akter,   Sonia; Bennett,   Jeffrey W.
The numerical certainty scale (NCS) and polychotomous choice (PC) methods are two widely used techniques for measuring preference uncertainty in contingent valuation (CV) studies. The NCS follows a numerical scale and the PC is based on a verbal scale. This report presents results of two experiments that use these preference uncertainty measurement techniques.   The first experiment was designed to compare and contrast the uncertainty scores obtained from the NCS and the PC method. The second experiment was conducted to test a preference uncertainty measurement scale that combines verbal expressions with numerical and graphical interpretations: a composite certainty scale (CCS). The construct validity of the certainty scores obtained from these three...
Tipo: Report
Palavras-chave: Preference uncertainty; Contingent valuation; Numerical certainty scale; Polychotomous choice method; Composite certainty scale; Climate change; Australia.; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q51; Q54.
Ano: 2010
URL: http://purl.umn.edu/94942

Bayesian Bootstrap Analysis of Systems of Equations
Provedor de dados: 31
Autores: Heckelei,   Thomas; Mittelhammer,   Ronald C.
Tipo: Working or Discussion Paper
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1996
URL: http://purl.umn.edu/18786

Submenu and dialogs for meta-analysis commands
Provedor de dados: 31
Autores: Steichen,   Thomas J.
The metadialog package provides Stata dialog boxes for the publicly available meta-analysis commands. It includes the commands needed to create a Meta-Analysis submenu on the StataCorp-defined User menu.
Tipo: Journal Article
Palavras-chave: Dialog; Menu; Meta-analysis; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116232

Prerequisites and limits for economic modelling of climate change impacts and adaptation
Provedor de dados: 31
Autores: Jotzo,   Frank.
There is demand for qualitative and quantitative economic analysis on the optimum degree of climate change mitigation and adaptation, the optimal timing of such actions, and their optimum distribution between countries and sectors.   This paper discusses what is, as well as what is not, possible for economic modelling in this field. Specific reference is made to the paper by Bosello, Carraro and de Cian (2009), as well as Tol (2009).   Integrated assessment modelling can provide powerful qualitative insights (for example, about the need for both mitigation and adaptation and the interactions between the two, or the need for both individual and policy-driven adaptation). However, the more detailed quantitative results from such studies are subject are...
Tipo: Report
Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/94951

DATA HANDLING RESTRICTIONS ON LARGE SCALE AGRICULTURAL MODELS
Provedor de dados: 31
Autores: Sluczanowski,   Philip W.R.
In a large-scale agricultural model a sizeable amount of low level data undergoes several stages of processing. In designing a model, uncertainty and complexity will restrict the generality of computer-implemented stages and much of the processing will be manual. The resulting model is likely to be inflexible to changes or else require as long again to modify and rerun as to design another model in order to evaluate another policy. By recognizing the necessary constraints imposed by mass data handling, the proportion of time spent on data problems could be reduced. Emphasis should be placed on defining beforehand as explicity as possible an acceptable methodology and what the specific uses of the model will be.
Tipo: Journal Article
Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1976
URL: http://purl.umn.edu/9171

Why Differences Make a Difference: Traditional Food Chain Performance in Selected European Countries
Provedor de dados: 31
Autores: Molnar,   Adrienn; Gellynck,   Xavier; Weaver,   Robert D.
Organizations no longer compete as independent entities, but as chains (Christopher 1998; Cox 1999; Lambert and Cooper 2000), and these organizations more and more realize the performance potential of chains (Pearson and Samali 2005; Gellynck, Vermeire and Viaene 2006). Being part of a well‐performing chain generates important performance benefits for the individual organization (Zhenxin, Hong and Edwin 2001). As a result, there is increasing interest in the performance of chains as a research subject (Beamon 1998). A vast group of authors (Neely, Mills, Platts, Gregory and Richards 1994; Neely, Gregory and Platts 1995; Beamon 1998; Christopher 1998; Beamon 1999; Li and O'Brien 1999; Van der Vorst 2000; Gunasekaran, Patel and Tirtiroglu 2001; Lambert and...
Tipo: Conference Paper or Presentation
Palavras-chave: Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; Production Economics; Research Methods/ Statistical Methods.
Ano: 2010
URL: http://purl.umn.edu/100508