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Registros recuperados: 4
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Calculating Murphy–Topel variance estimates in Stata: A simplified procedure AgEcon
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
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Complements and Meat Demand in the U.S. AgEcon
Davis, Christopher G.; Stefanova, Stela; Hahn, William F.; Yen, Steven T..
In this study we estimated the price elasticities among meats, vegetables, grains, and potatoes and the impact that different levels of income have on the demand for these commodities. The 2005 Nielsen retail home scan data were used to construct a censored demand system of 14 equations. Results revealed that the uncompensated cross-price elasticities for both low and high-incomes suggest both substitution and complement relationships, while the compensated price elasticities are dominated primarily by substitution relationships. Our findings also revealed that expenditure elasticities among both low and high-income households differ for most commodities.
Tipo: Conference Paper or Presentation Palavras-chave: Censored dependent variables; Meats; Poultry; Fish; Vegetables; Sample selection model; Two-step estimation; Demand and Price Analysis; Livestock Production/Industries; C25; D12; Q11.
Ano: 2008 URL: http://purl.umn.edu/6406
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Demand for Organic and Conventional Fruits AgEcon
Lin, Biing-Hwan; Yen, Steven T.; Huang, Chung L..
We examine consumer demand for organic and conventional fruits by estimating a censored demand system, using Nielsen's Homescan data. Sociodemographic characteristics and income are found to be significant factors of organic fruit consumption. Consumers are responsive to own-price changes in selected organic fruits, while the own-price elasticities for conventional fruits are much smaller. Asymmetric cross-price effects are found between organic and conventional fruits, suggesting that a change in relative prices will more likely cause consumers of conventional fruits to "cross-over" to organic fruits, while the reverse is less likely to happen such that organic consumers will "revert" to conventional fruits.
Tipo: Conference Paper or Presentation Palavras-chave: Organic fruit; Homescan data; Censored demand system; Two-step estimation; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety.
Ano: 2008 URL: http://purl.umn.edu/6440
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Social Capital and Soil Erosion Control in Agriculturally Marginal Areas of Kenya: The Case of Machakos and Taita-Taveta Districts AgEcon
Obare, Gideon A.; Mwakubo, Samuel M.; Ouma, Emily Awuor; Mohammed, Lutta; Omiti, John M..
This paper evaluates the farmers’ perception of the soil erosion problem, and identifies and analyses social capital elements that motivate households to actively participate in soil conservation in agricultural production process. The data used in the study was generated using a structured questionnaire in a survey that covered 321 households in Kenya’s semi arid districts of Machakos and Taita-Taveta Districts. Two modelling strategies were used: A Probit model was used to estimate the likelihoods of factors that may influence farmers’ perception of soil erosion problem, and a Tobit to estimate parameters of factors that influence terracing intensity. The results indicate that although perception of the soil erosion problem is relatively high in the...
Tipo: Conference Paper or Presentation Palavras-chave: Social capital; Marginal areas; Soil erosion; Perception; Two-step estimation; Kenya; Research and Development/Tech Change/Emerging Technologies; C24; D23; Q15; Z13.
Ano: 2004 URL: http://purl.umn.edu/9532
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