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Adopción de prácticas de conservación de suelos, en la pequeña agricultura de Chile Central AgEcon
Jara-Rojas, Roberto; Bravo-Ureta, Boris E.; Diaz Osorio, Jose.
Published by Asociación de Economistas Agrarios de Chile
Tipo: Journal Article Palavras-chave: Technology adoption; Soil conservation; Poisson regression; Peasant farmers; Chile.; Community/Rural/Urban Development; Land Economics/Use; Production Economics.
Ano: 2009 URL: http://purl.umn.edu/97379
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CROP DIVERSITY AS THE DERIVED OUTCOME OF FARMERS' 'SURVIVAL FIRST' MOTIVES IN ETHIOPIA: WHAT ROLE FOR ON-FARM CONSERVATION OF SORGHUM GENETIC RESOURCES? AgEcon
Wale, Edilegnaw; Virchow, Detlef.
Crop genetic resources are the building blocks of sustainable agricultural development due to their relevance not only as inputs for variety development but also as indigenous crop insurance mechanisms through traditional variety portfolio management. Their continuous survival is, however, threatened by natural and human driven factors. This threat has induced the need for designing conservation measures. Among the in situ and ex situ conservation options available to conserve crop genetic resources, on-farm conservation has recently attracted enormous attention. To make this option operational, placing incentives (that link conservation with utilization) and removal of perverse incentives are believed to be crucial so that landraces of no immediate...
Tipo: Conference Paper or Presentation Palavras-chave: On-farm conservation; Sorghum genetic resources; Incentives; Poisson regression; Ethiopia; Crop Production/Industries.
Ano: 2003 URL: http://purl.umn.edu/25882
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Demographic Factors Affecting the Adoption of Multiple Value-Added Practices by Oklahoma Cow-Calf Producers AgEcon
Williams, Brian R.; Raper, Kellie Curry; DeVuyst, Eric A.; Peel, Derrell S.; Lalman, David L.; Richards, Chris; Doye, Damona G..
The utilization of marketing programs to enhance feeder calf value has been met with modest success in Oklahoma. Value-added programs are continually promoted as avenues for improving cow-calf profitability, but producer adoption of value-added practices lags in spite of research showing the value of these practices. Identifying producer characteristics that increase their likelihood to adopt value-added practices is critical to developing successful outreach efforts. Results from a survey of Oklahoma producers on value-added practice adoption indicate that multiple demographic variables influence a producer’s likelihood of practice adoption. For Extension specialists, results can help in targeting likely adopters and developing methods to overcome...
Tipo: Presentation Palavras-chave: Beef producers; Value-added practices; Practice adoption; Negative binomial regression; Poisson regression; Farm Management; Livestock Production/Industries; Q12; Q16.
Ano: 2012 URL: http://purl.umn.edu/119743
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Maximum likelihood estimation of endogenous switching and sample selection models for binary, ordinal, and count variables AgEcon
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
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Regulatory SPS instruments in meat trade AgEcon
Schlueter, Simon W.; Wieck, Christine; Heckelei, Thomas.
Policy makers have to choose between different potentially risk-reducing instruments regulating agri-food trade. Analysing the meat sector, the paper aims at identifying least trade distorting regulations for different policy goals relevant to the SPS agreement. For this purpose, a non-linear gravity model is estimated by Poisson pseudo-maximum likelihood and applied to a panel data set at HS 4-digit level. Regulations are distinguished by a frequency approach allowing to identify the least trade distorting regulation for each policy objective. The results suggest significant differences of trade impacts between types of sanitary regulations.
Tipo: Working or Discussion Paper Palavras-chave: Agri-food trade; Gravity model; Poisson regression; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; International Relations/Trade; C23; F14; Q17.
Ano: 2009 URL: http://purl.umn.edu/56972
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The Adoption of Best-Management Practices by Louisiana Dairy Producers AgEcon
Rahelizatovo, Noro C.; Gillespie, Jeffrey M..
This study examines the adoption of best-management practices (BMPs) in terms of the total number of practices implemented up to a certain period, using count data analysis. Poisson and negative binomial regressions were used to examine the likely determinants of producers’ decisions to adopt greater numbers of technologies, and the specific case of dairy producers’ adoption of BMPs was explored. Our results emphasize the significant effect of producers’ awareness of the efforts to control non-point source pollution, information about BMPs, farms size, producer’s educational attainment, and risk aversion on the number of BMPs adopted.
Tipo: Journal Article Palavras-chave: Best management practices (BMP); Count data analysis; Dairy industry; Negative binomial regressions; Poisson regression; Q12; Q16.
Ano: 2004 URL: http://purl.umn.edu/43445
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Understanding the multinomial-Poisson transformation AgEcon
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
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