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2nd Forum on Irrigation and water for sustainable development: 15 –16 December, 2008 Ghion Hotel, Addis Ababa, Ethiopia AgEcon
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
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A BAYESIAN ALTERNATIVE TO GENERALIZED CROSS ENTROPY SOLUTIONS FOR UNDERDETERMINED ECONOMETRIC MODELS AgEcon
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
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A BAYESIAN FRAMEWORK FOR OPTIMAL INPUT ALLOCATION WITH AN UNCERTAIN STOCHASTIC PRODUCTION FUNCTION AgEcon
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
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A Bayesian Large Deviations Probabilistic Interpretation and Justification of Empirical Likelihood AgEcon
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
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A BEGINNER'S GUIDE TO VECTOR AUTOREGRESSION AgEcon
Ford, Stephen A..
Tipo: Working or Discussion Paper Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1986 URL: http://purl.umn.edu/13527
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A Better Approach to Resolving Variable Selection Uncertainty in Meta Analysis for Benefits Transfer AgEcon
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
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A bioeconomic model for determining the optimal response to a new weed incursion in Australian cropping systems AgEcon
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
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A brief history of Stata on its 20th anniversary AgEcon
Cox, Nicholas J..
Tipo: Journal Article Palavras-chave: Research Methods/ Statistical Methods.
Ano: 2005 URL: http://purl.umn.edu/117491
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A BRIEF OVERVIEW OF NONPARAMETRIC METHODS IN ECONOMICS AgEcon
Hallam, Arne.
Tipo: Journal Article Palavras-chave: Research Methods/ Statistical Methods.
Ano: 1992 URL: http://purl.umn.edu/29001
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A CAUTIONARY NOTE ON POLYNOMIAL DISTRIBUTED LAG FORMULATIONS OF SUPPLY RESPONSE AgEcon
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
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A CGE Analysis of the Harbinson Proposal: Outcomes for the EU25 AgEcon
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
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A Choice Modelling Survey of Community Attitudes to Improvements in Environmental Quality in NSW Catchments AgEcon
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
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A CLASS OF SEPARABILITY FLEXIBLE FUNCTIONAL FORMS AgEcon
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
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A closer examination of subpopulation analysis of complex–sample survey data AgEcon
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
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A COMMENT ON KLIEVE-MACAULAY'S SOUTHERN BLUEFIN TUNA GAME AgEcon
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
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A COMPARATIVE ANALYSIS OF AGRICULTURAL TRACTOR INVESTMENT MODELS AgEcon
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
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A COMPARATIVE ANALYSIS OF RISK PREFERENCE ELICITATION PROCEDURES USING MAIL SURVEY RESULTS AgEcon
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
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A Comparison of Approaches to Mitigate Hypothetical Bias AgEcon
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
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A COMPARISON OF CRITERIA FOR EVALUATING RISK MANAGEMENT STRATEGIES AgEcon
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
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A Comparison of Historic and Implied Volatility for Predicting Agricultural Option Premiums AgEcon
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
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