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	Provedor de dados AgEcon (7) Autor Galletto, Luigi (2) Scarpa, Riccardo (2) Thiene, Mara (2) Becker, Sascha O. (1) Blahna, Dale (1) Caliendo, Marco (1) Haan, Peter (1) Hardaker, J. Brian (1) Holden, Stein T. (1) Jakus, Paul M. (1) Keith, John E. (1) Kumbhakar, Subal C. (1) Lien, Gudbrand D. (1) Liu, Lu (1) Tatwangire, Alex (1) Uhlendorff, Arne (1) Mais... Palavra-chave Unobserved heterogeneity (7) Consumer preferences (2) Latent Class Attitudinal model (2) Organic products (2) Panel data (2) Research Methods/ Statistical Methods (2) WTP (2) Consumer/Household Economics (1) Demand and Price Analysis (1) Efficiency (1) Endogeneity of land access (1) Environmental Economics and Policy (1) Farm Management (1) Food Consumption/Nutrition/Food Safety (1) Halton sequences (1) Land Economics/Use (1) Matching (1) Maximum simulated likelihood (1) Mhbounds (1) Multinomial logistic model (1) Mais... Tipo do documento Conference Paper or Presentation (4) Journal Article (2) Article (1) Ano 2010 (1) 2009 (1) 2008 (1) 2007 (1) 2006 (3) País United States (7) Idioma Inglês (7)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 7 Primeira ... 1 ... Última Sensitivity analysis for average treatment effects AgEcon 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 The Welfare Effects of Restricting Off-Highway Vehicle Access to Public Lands AgEcon Jakus, Paul M.; Keith, John E.; Liu, Lu; Blahna, Dale. Off-highway vehicle (OHV) use is a rapidly growing outdoor activity that results in a host of environmental and management problems. Federal agencies have been directed to develop travel management plans to improve recreation experiences, reduce social conflicts, and diminish environmental impacts of OHVs. We examine the effect of land access restrictions on the welfare of OHV enthusiasts in Utah using Murdock’s unobserved heterogeneity random utility model (Murdock 2006). Our models indicate that changing access to public lands from fully “open” to “limited” results in relatively small welfare losses, but that prohibiting access results in much larger welfare losses. Tipo: Journal Article Palavras-chave: Off-highway vehicles; Recreational access; Unobserved heterogeneity; Random utility model; Environmental Economics and Policy. Ano: 2010 URL: http://purl.umn.edu/59337 DETERMINANTS OF PART-TIME FARMING AND ITS EFFECT ON FARM PRODUCTIVITY AND EFFICIENCY AgEcon Lien, Gudbrand D.; Kumbhakar, Subal C.; Hardaker, J. Brian. Little attention has been given in the agricultural economics literature to the impact of off-farm work on farm productivity and efficiency. More knowledge about what determines part-time farming and whether farm productivity and efficiency are affected by part-time farming could help policy makers introduce better targeted rural development policies. This paper aims to fill the above-mentioned gaps by first analysing factors that influence the choice of off-farm work; and then examining how off-farm work influences productivity and technical efficiency at the farm level. An unbalanced panel data set from 1991 to 2005 from Norwegian grain farms is used for this purpose. The results show that the likelihood of off-farm work and the share of time allocated... Tipo: Conference Paper or Presentation Palavras-chave: Off-farm work; Productivity; Efficiency; Unobserved heterogeneity; Panel data; Farm Management. Ano: 2008 URL: http://purl.umn.edu/6701 Modes of Land Access and Welfare Impacts in Uganda AgEcon Tatwangire, Alex; Holden, Stein T.. This article estimates the poverty reducing impact of land access in rural Uganda. Using balanced panel data for 309 households in 2001, 2003, and 2005, models that control for unobserved household heterogeneity and endogeneity of land acquisition and disposition are employed to measure the poverty-reduction effect of land on household income and expenditure per adult equivalent. Significant poverty reduction effects of increased land access in form of owned, operated and market-accessed land were found. The poverty reduction effect for land accessed through the market was significantly larger than the poverty reduction effect of land accessed through inheritance. Tipo: Conference Paper or Presentation Palavras-chave: Endogeneity of land access; Unobserved heterogeneity; Poverty impacts.; Land Economics/Use; O55; Q15; O12. Ano: 2009 URL: http://purl.umn.edu/51635 Consumers WTP for Wine with Certified Origin: Latent Classes Based on Attitudinal Responses AgEcon Scarpa, Riccardo; Thiene, Mara; Galletto, Luigi. This paper investigates preference heterogeneity of wine consumers by using latent class models based on attitudinal questions. Such responses turn out to be an important source of additional information when the goal is to identify different groups of people with a similar wine preference structure. We assume that preferences are latent and the responses to attitudinal questions are the visible effect of this latent heterogeneity. We find evidence of 4 different classes of respondents with similar response patterns. We focus on preferences for a well-known wine, the Prosecco, and sample the population in the area of production. For each preference-class we estimate a class-specific WTP equation for this wine, so as to estimate the class responsiveness of... Tipo: Conference Paper or Presentation Palavras-chave: Latent Class Attitudinal model; Consumer preferences; Organic products; WTP; Unobserved heterogeneity; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety. Ano: 2006 URL: http://purl.umn.edu/6689 Estimation of multinomial logit models with unobserved heterogeneity using maximum simulated likelihood AgEcon 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 Consumers WTP for wine with certified origin: Latent classes based on attitudinal responses AgEcon Scarpa, Riccardo; Thiene, Mara; Galletto, Luigi. This paper investigates preference heterogeneity of wine consumers by using latent class models based on attitudinal questions. Such responses turn out to be an important source of additional information when the goal is to identify different groups of people with a similar wine preference structure. We assume that preferences are latent and the responses to attitudinal questions are the visible effect of this latent heterogeneity. We find evidence of 4 different classes of respondents with similar response patterns. We focus on preferences for a well-known wine, the Prosecco, and sample the population in the area of production. For each preference-class we estimate a class-specific WTP equation for this wine, so as to estimate the class responsiveness of... Tipo: Conference Paper or Presentation Palavras-chave: Latent Class Attitudinal model; Consumer preferences; Organic products; WTP; Unobserved heterogeneity; Demand and Price Analysis. Ano: 2006 URL: http://purl.umn.edu/10046 Registros recuperados: 7 Primeira ... 1 ... Última

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