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Registros recuperados: 26
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A Comparison of Imputation Methods under Large Samples and Different Censoring Levels (PowerPoint) AgEcon
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
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A minimum cross entropy model to generate disaggregated agricultural data at the local level AgEcon
Xavier, Antonio; Martins, Maria de Belem Costa Freitas; Fragoso, Rui Manuel de Sousa.
This work presents an entropy approach to disaggregate agricultural data at a local level. It comprises two different steps. In a first one, an information prior at disaggregated level based on experts’ opinions, available cartography of land use and biophysical data is created. In a second step, it’s used a minimum cross entropy process in order to manage these information inputs and to guaranty a solution compatible with all the different restrictions. The model was applied to the region of Algarve in the year of 1999, in order to disaggregate the data at the pixel and county level. Results show that the model was able to provide some satisfactory results since the estimated values obtained for the different areas revealed a good approximation to the...
Tipo: Conference Paper or Presentation Palavras-chave: Minimum cross entropy; Data disaggregation; Local level; Algarve; Agricultural policies; Agricultural and Food Policy; C11; C81; Q15; R14.
Ano: 2011 URL: http://purl.umn.edu/98991
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Canadian Consumer Attitudes and Purchasing Behaviour of Omega-3 Products AgEcon
Nilsson, Tomas K.H.; Chase, Darren; Emunu, John Paul; McCann-Hiltz, Diane; Peng, Yanning.
The development of innovative functional food products is a major trend in today's food industry. The growth of this industry is driven by increased consumer awareness of their own health deficiencies, increased understanding of the possible health benefits of functional foods, development in formulation technologies, a positive regulatory environment and changing consumer demographics and lifestyles. While there has been a proliferation of omega-3 products such as milk, eggs, yogurt, and margarine in the Canadian food market, very little is known about consumers of omega-3 products. In our study we use ACNielsen HomescanTM data combined with ACNielsen Panel TrackTM survey data to develop profiles of omega-3 consumers in Canada. The focus of the study is...
Tipo: Working or Discussion Paper Palavras-chave: Omega-3 fatty acids; Nutritional labelling; Health benefits; Ordered probit model; Food Consumption/Nutrition/Food Safety; C81; D12; I19; Q19.
Ano: 2007 URL: http://purl.umn.edu/7713
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Determinants of Poverty among U.S. Farm Households AgEcon
El-Osta, Hisham S.; Morehart, Mitchell J..
This research uses data from the 2004 Agricultural Resource Management Survey and probit regression to examine the determinants of poverty among U.S. farm households. The findings reveal, among others, the importance of a livelihood strategy that combines participation in government programs and off-farm work in lowering poverty rates. Findings also show the importance of educational attainment of the farm operator in mitigating poverty, but only when poverty is measured on a relative rather than an absolute basis. Policy recommendations are provided in the context of these findings.
Tipo: Journal Article Palavras-chave: Composite measure of economic well-being; Government programs; Off-farm work; Poverty; Agricultural Finance; Financial Economics; Labor and Human Capital; J23; J24; D3; I21; I32; C81.
Ano: 2008 URL: http://purl.umn.edu/45037
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Documentation of a multi-topic questionnaire-based survey on sustainable resource use in rural China AgEcon
Jia, Xiangping; Buchenrieder, Gertrud.
This Discussion Paper documents a survey conducted in rural China in 2005. A multi-topic survey funded by the Sino-German international Training Program "Sustainable Resource Use in North China", the project covers farm management, land property rights and rural credit access on the North China Plain. From a credit standpoint, this paper covers questionnaire design, sample, survey implementation, data entry, a brief assessment of the overall experience, as well as lessons drawn.
Tipo: Working or Discussion Paper Palavras-chave: Questionnaire; Survey; Credit access; Household model; Categorical variables; Stata.; Agribusiness; Farm Management; Food Consumption/Nutrition/Food Safety; International Development; Land Economics/Use; Productivity Analysis; Resource /Energy Economics and Policy; C81; C93; D19.
Ano: 2007 URL: http://purl.umn.edu/90856
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DOCUMENTATION OF THE POLAND FARM SURVEY 2000 AgEcon
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
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Effects of Endogenous Task Complexity and the Endowed Bundle on Stated Choice AgEcon
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
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Estimation of Treatment Effect of Asthma Case Management Using Propensity Score Methods AgEcon
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
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Evaluating the Impact on Market Performance of Investments in Market Information Systems: Methodological Challenges AgEcon
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
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Farm Animal Welfare, Consumer Willingness to Pay, and Trust: Results of a Cross-National Survey AgEcon
Nocella, Giuseppe; Hubbard, Lionel J.; Scarpa, Riccardo.
Higher animal welfare standards increase costs along the supply chain of certified animal-friendly products (AFP). Since the market outcome of certified AFP depends on consumer confidence toward supply chain operators complying with these standards, the role of trust in consumer willingness-to-pay (WTP) for AFP is paramount. Results from a contingent valuation survey administered in five European Union countries show that WTP estimates were sensitive to robust measures of consumer trust for certified AFP. Deriving the WTP effect of a single food category on total food expenditure is difficult for survey respondents; hence, a budget approach was employed to facilitate this process.
Tipo: Conference Paper or Presentation Palavras-chave: Animal welfare; Certification; Consumer trust; WTP; Budget approach; Crop Production/Industries; Environmental Economics and Policy; Farm Management; Livestock Production/Industries; C81; Q13; Q18.
Ano: 2010 URL: http://purl.umn.edu/96832
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Forecasting the Adoption of GM Oilseed Rape: Evidence from a Discrete Choice Experiment AgEcon
Breustedt, Gunnar; Muller-Scheessel, Jorg; Latacz-Lohmann, Uwe.
This paper explores farmers’ willingness to adopt genetically modified oilseed rape prior to its commercial release and estimates the ‘demand’ for the new technology. The analysis is based upon choice experiments with 202 German arable farmers. A multinomial probit estimation revealed that GM attributes such as gross margin, expected liability from cross pollination, or flexibility in returning to conventional oilseed rape significantly affect the likelihood of adoption. Neighbouring farmers’ attitudes towards GM cropping and a number of farmer and farm characteristics were also found to be significant determinants of prospective adoption. Demand simulations suggest that adoption rates are very sensitive to the profit difference between GM and non-GM rape...
Tipo: Conference Paper or Presentation Palavras-chave: Adoption forecast; Choice experiment; Genetically modified oilseed rape; Multinomial probit; Technology adoption; C42; C81; Q12; Q16.
Ano: 2008 URL: http://purl.umn.edu/36771
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Inside the 'Black Box' of Project Star: Estimation of Peer Effects Using Experimental Data AgEcon
Boozer, Michael A.; Cacciola, Stephen E..
The credible identification of endogenous peer group effects— i.e. social multiplier or feedback effects —has long eluded social scientists. We argue that such effects are most credibly identified by a randomly assigned social program which operates at differing intensities within and between peer groups. The data we use are from Project STAR, a class size reduction experiment conducted in Tennessee elementary schools. In these data, classes were comprised of varying fractions of students who had previously been exposed to the Small class treatment, creating class groupings of varying experimentally induced quality. We use this variation in class group quality to estimate the spillover effect. We find that when allowance is made for this ‘feedback’ effect...
Tipo: Working or Discussion Paper Palavras-chave: Peer effects; Data with a group structure; Organization of schooling; Experimental evidence; Teaching/Communication/Extension/Profession; Z13; C51; C81; I21; C23.
Ano: 2001 URL: http://purl.umn.edu/28524
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La tipologia de las explotaciones en funcion de su viabilidad economica y demografica: aplicacion a las explotaciones de bovino en Galicia AgEcon
Garcia, Francisco Sineiro; Iglesias, Edelmiro Lopez; Fernandez, Roberto Lorenzana; Pacos, Bernardo Valdes.
RESUMEN En este artículo se elabora una tipología de las explotaciones de bovino en Galicia en función de su viabilidad económica y demográfica, empleando como fuente las bases de datos anonimizadas de los censos agrarios de 1989 y 1999. Los resultados así obtenidos son utilizados en una triple dirección: ofrecer una radiografía de la estructura actual del sector, interpretar sus transformaciones recientes y proyectar las tendencias para la próxima década (1999-2009). El análisis permite concluir que el sector está integrado por tres grandes grupos de explotaciones, con unas características y unas perspectivas muy diferentes: aquéllas con viabilidad económica y demográfica, sólo 1/5 pero que concentran ya la mayor parte del output; las que están en manos...
Tipo: Journal Article Palavras-chave: Viability of farms; Agrarian structures; Bovine livestock; Galicia; Structural adjustment; Livestock Production/Industries; C81; Q12; Q15; Q18.
Ano: 2004 URL: http://purl.umn.edu/28775
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Microeconomic and Geo-physical Data Integration for Agri-environmental Analysis, Georeferencing FADN Data: A Case Study in Italy AgEcon
Fais, Andrea; Nino, Pasquale; Giampaolo, Antonio.
The authors, inside a TAPAS action, have developed a methodology - based on the integration between FADN data with statistical, administrative and cartographic information - to improve the production of statistical data related to agricultural policies impact on land and environment. This methodology allows - using Geographic Information System (GIS) technology - to produce and organise data at geographical level. Data spatially referenced respond to the specific needs of agri-environmental analysis and problems, mostly related to specific areas (environmental vulnerability areas), inside defined boundaries (e.g. river basin). The GIS is implemented with several cartographic layers (Topographic and cadastral maps, land use, soils, water sources, climate,...
Tipo: Conference Paper or Presentation Palavras-chave: Agricultural statistics; Agri-environment; FADN; GIS; TAPAS; DPSIR; Environmental Economics and Policy; C81; O13; Q21.
Ano: 2005 URL: http://purl.umn.edu/24547
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Modeling Advertising Expenditures and Spillover Effects Applied to the U.S. Non-Alcoholic Beverage Industry: Vector Autoregression (VAR) and Polynomial Distributed Lag (PDL) Approaches AgEcon
Dharmasena, Senarath; Capps, Oral, Jr.; Bessler, David A..
The non-alcoholic beverage market in the U.S. is a multi-billion dollar industry growing steadily over the past decade. Also, non-alcoholic beverages are among the most heavily advertised food and beverage groups in the United States. Several studies pertaining to non-alcoholic beverages including the incorporation of advertising effects have been conducted, but most of these have centered attention on milk consumption. Some studies have considered demand interrelationships for several beverages including advertising effects in systems-wide analyses. In our analysis, we develop and employ a unique monthly time-series data set derived from Nielsen Homsescan panels for household purchases of non-alcoholic beverages over the period from January 1998 through...
Tipo: Presentation Palavras-chave: Non-alcoholic beverages; Vector autoregression; Polynomial distributed lags; Beverage advertizing; Directed acyclic graphs; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Marketing; C18; C22; C52; C53; C81; D11; D12.
Ano: 2012 URL: http://purl.umn.edu/124363
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MUNICIPALITY DISAGGREGATION OF GERMAN'S AGRICULTURAL SECTOR MODEL RAUMIS AgEcon
Roeder, Norbert; Gocht, Alexander.
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 9.000 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 municipality...
Tipo: Conference Paper or Presentation Palavras-chave: Highest Posterior Density estimator (HPD); RAUMIS; Down scaling; Agricultural and Food Policy; C11; C61; C81; Q15.
Ano: 2011 URL: http://purl.umn.edu/99248
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None-of-These Bias in Stated Choice Experiments AgEcon
Alfnes, Frode; Steine, Gro.
We conduct a within-sample test of hypothetical bias and parameter equality between a hypothetical stated choice (SC) experiment using pictures and a real choice (RC) experiments using products. With exception of the none-of-these alternative-specific dummy, we cannot reject parameter equality between the two datasets. However, when we estimate the models separately with no parameter restrictions, the SC experiment gave WTP estimates that were approximately 50 percent higher and marginal WTP estimates that were almost two times as high as the corresponding estimates from the RC experiment. However, even though the monetary value of the WTP disparity was large, the disparity between the WTP estimates from the two data sets was not statistically significant.
Tipo: Conference Paper or Presentation Palavras-chave: Choice experiment; Hypothetical bias; Color; Mixed logit; Salmon; Willingness to pay; Consumer/Household Economics; C81; C93; D12; Q22.
Ano: 2005 URL: http://purl.umn.edu/24761
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POLAND'S AGRICULTURE: SERIOUS COMPETITOR OR EUROPE'S POORHOUSE? SURVEY RESULTS ON FARM PERFORMANCE IN SELECTED POLISH VOIVODSHIPS AND A COMPARISON WITH GERMAN FARMS AgEcon
Petrick, Martin; Spychalski, Grzegorz; Switlyk, Michal; Tyran, Ewa.
The aim of this paper is to present an analysis of farm-level data collected in a survey of 464 Polish farms in 2000. Performance indicators of farms in three Polish voivodships are compared with farm accountancy data from two German Länder. The results show that Polish farms were much less profitable than their German counterparts. The gap in income levels is much higher between persons employed in the agricultural sector than between average working persons in the two countries. Living standards within the Polish farm sector decline from the north-west to the south-east. The analysis suggests that the lower profitability of farms is a consequence of pronounced structural deficiencies due to a quite unfavourable workforce-land ratio on Polish farms and...
Tipo: Working or Discussion Paper Palavras-chave: Agriculture; Farm performance; Survey data; Poland; Germany; Farm Management; Q12; C81; P32.
Ano: 2001 URL: http://purl.umn.edu/14894
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Problem Solving and Hypothesis Testing Using Economic Experiments AgEcon
Hudson, Darren.
The roots and uses of economic experiments in problem solving and hypothesis testing are explored in the present article. The literature suggests that the primary advantage of economics experiments is the ability to use controlled stimuli to test economic hypotheses. Other literature also suggests that experiments are useful in problem solving settings. The advantages and disadvantages of experiments are discussed.
Tipo: Journal Article Palavras-chave: Experiments; Problem solving; Hypothesis testing; C81; C91; C92; C93.
Ano: 2003 URL: http://purl.umn.edu/43209
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Salvage the treasure of geographic information in Farm census data AgEcon
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
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