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	Provedor de dados AgEcon (2) Autor Guermat, Cherif (1) Hadri, Kaddour (1) Ni, Jianhong (1) Whittaker, Julie (1) Zhang, Sizhu (1) Zhang, Yu (1) Mais... Palavra-chave Stochastic frontier production (2) Bioethanol (1) C23 (1) C24 (1) D24 (1) Energy crop (1) Farm Management (1) Heteroscedasticity (1) International Development (1) Panel data (1) Production Economics (1) Q12 (1) Research Methods/ Statistical Methods (1) Sustainable production (1) Technical efficiency (1) Yunnan province (1) Mais... Tipo do documento Conference Paper or Presentation (1) Journal Article (1) Ano 2011 (1) 2003 (1) País United States (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Estimating Farm Efficiency in the Presence of Double Heteroscedasticity Using Panel Data AgEcon Hadri, Kaddour; Guermat, Cherif; Whittaker, Julie. The accuracy of technical efficiency measures is important given the interest in such measures in policy discussions. In recent years the use of stochastic frontiers has become popular for estimating technical inefficiency, but estimated inefficiencies are sensitive to specification errors. One source of such errors is heteroscedasticity. This paper addresses this issue by extending the Hadri (1999) correction for heteroscedasticity to stochastic production frontiers and to panel data. It is argued that heteroscedasticity within an estimation can have a significant effect on results, and that correcting for heteroscedasticity yields more accurate measures of technical inefficiency. Using panel data on cereal farms, it is found that the usual technical... Tipo: Journal Article Palavras-chave: Stochastic frontier production; Heteroscedasticity; Technical efficiency; Panel data; Farm Management; Research Methods/ Statistical Methods; C23; C24; D24; Q12. Ano: 2003 URL: http://purl.umn.edu/43994 Sustainable Energy Crop Production: A Case Study for Sugarcane and Cassava Production in Yunnan, China AgEcon Zhang, Yu; Ni, Jianhong; Zhang, Sizhu. The possibility of using biomass as a source of energy in reducing the greenhouse-effect imposed by carbon dioxide emission and relieving energy crisis is a matter of great interest, such as bioethanol production. Nevertheless, the cultivation of dedicated energy crops dose meet with some criticisms (conflict with food security and environmental degradation, for example). Nowadays sugarcane and cassava are regarded as the potential energy crops for bioethanol production. Endowed with natural resources and favorable weather condition, Yunnan province, China, is the major sugarcane and cassava production area in China. This paper presents production structures of these two crops in Yunnan and compares the sustainable production between the usages of... Tipo: Conference Paper or Presentation Palavras-chave: International Development; Production Economics; Energy crop; Stochastic frontier production; Sustainable production; Yunnan province; Bioethanol. Ano: 2011 URL: http://purl.umn.edu/100737 Registros recuperados: 2 Primeira ... 1 ... Última

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