Data Envelopment Analysis(DEA) is a mathematical technique to assess relative efficiencies of decision making units(DMUs).The efficiency of 14 Iranian forest companies and forest management units was investigated in 2...Data Envelopment Analysis(DEA) is a mathematical technique to assess relative efficiencies of decision making units(DMUs).The efficiency of 14 Iranian forest companies and forest management units was investigated in 2010.Efficiency of the companies was estimated by using a traditional DEA model and a two-stage DEA model.Traditional DEA models consider all DMU activities as a black box and ignore the intermediate products, while two-stage models address intermediate processes.LINGO software was used for analysis.Overall production was divided into to processes for analyses by the two-stage model, timber harvest and marketing.Wilcoxon's signed-rank test was used to identify the differences of average efficiency in the harvesting and marketing sub-process.Weak performance in the harvesting sub-process was the cause of low efficiency in 2010.Companies such as Neka Chob and Kelardasht proved efficient at timber harvest, and Neka Chob forest company scored highest in overall efficiency.Finally, the reference units identified according to the results of two-stage DEA analysis.展开更多
Two-oriented agriculture was a complex organism coupling production,economics,society and ecology.Its development process was affected by various factors such as producers,nature,society,etc.In order to overcome measu...Two-oriented agriculture was a complex organism coupling production,economics,society and ecology.Its development process was affected by various factors such as producers,nature,society,etc.In order to overcome measurement error of traditional data envelopment analysis caused by ignoring random,three-stage DEA model was studied to remove environmental factors and random effects.On the foundation of this model was two-oriented agriculture comprehensive production efficiency of 14 cities were estimated in Hunan Province in 2008,and brown forth corresponding policy proposals to promote agricultural development.展开更多
文摘Data Envelopment Analysis(DEA) is a mathematical technique to assess relative efficiencies of decision making units(DMUs).The efficiency of 14 Iranian forest companies and forest management units was investigated in 2010.Efficiency of the companies was estimated by using a traditional DEA model and a two-stage DEA model.Traditional DEA models consider all DMU activities as a black box and ignore the intermediate products, while two-stage models address intermediate processes.LINGO software was used for analysis.Overall production was divided into to processes for analyses by the two-stage model, timber harvest and marketing.Wilcoxon's signed-rank test was used to identify the differences of average efficiency in the harvesting and marketing sub-process.Weak performance in the harvesting sub-process was the cause of low efficiency in 2010.Companies such as Neka Chob and Kelardasht proved efficient at timber harvest, and Neka Chob forest company scored highest in overall efficiency.Finally, the reference units identified according to the results of two-stage DEA analysis.
文摘Two-oriented agriculture was a complex organism coupling production,economics,society and ecology.Its development process was affected by various factors such as producers,nature,society,etc.In order to overcome measurement error of traditional data envelopment analysis caused by ignoring random,three-stage DEA model was studied to remove environmental factors and random effects.On the foundation of this model was two-oriented agriculture comprehensive production efficiency of 14 cities were estimated in Hunan Province in 2008,and brown forth corresponding policy proposals to promote agricultural development.
