SFA와 DEA를 비교한 우리나라 근해어업의 효율성 분석

A study on the Efficiency of Korean Offshore Fisheries comparing between SFA and DEA

Domestic seafood has been widely used as a main protein source of the people, and demand for seafood is increasing year by year due to increase in national income and development of eating out culture. It is necessary to study to provide information to improve fishery income by improving efficiency and lowering inefficiency due to decline of earning of offshore fishery in recent 10 years. Both Stochastic Frontier Model and Data Envelopment Analysis were applied and the efficiency was compared and Wilcoxon test was conducted. Before the SFA analysis, the translog production function model was selected as a suitable model in this study. The estimation results of fishery production function show that the distribution of inefficiency follows a half-normal distribution, the technical inefficiency clearly exists in the production function, and the efficiency improves with time. In the DEA-SFA analysis, the average efficiency was estimated as 88% in the SFA, 49% under the Constant Return to Scale, and 70% under the Variable Return to Scale. As a wilcoxon test result, only one of 14 fisheries had commonality in fishery in the Constant Return to Scale. The yearly agreement of estimates were not consistent between SFA and CRS, while all the years showed the consistent estimates between SFA and VRS. Therefore, it was found that the estimates of SFA model should be considered to be consistent with those estimates in DEA model under the Variable Return to Scale.