EFFICIENCY DETERMINATION OF THE FOREST SUB-DISTRICTS BY USING FUZZY DATA ENVELOPMENT ANALYSIS (CASE STUDY: İZMİR FOREST REGIONAL DIRECTORATE)

In this research, efficiency covering the years 2007-2009 of the forest sub-districts in the Izmir Forest Regional Directorate was evaluated using 15 variables by fuzzy data envelopment analysis. Fuzzy DEA solutions were carried out using the data range. Fuzzy data was established by defining the lower, central and upper limits on the basis of the triangular membership function. These data are converted into interval data considering the approach of Zimmermann (1991) I± cutting set. Thus, the upper and lower limits of efficiency values were obtained at five different I± (0; 0.25; 0.50; 0.75 and 1.00) using fuzzy data envelopment analysis. Then inefficient forest sub-districts were listed from best to worst using the Minimax Regret-Based Approach. As a conclusion, Gocbeyli, Sarigol, Kinik, YeniŞakran and Kemalpasa forest sub-districts have the best efficiency. On the other hand, Salihli, Gordes, Akhisar, Manisa, Odemis and Tire forest sub-districts have the worst efficiency. Keywords: Forest sub-districts, Efficiency, Fuzzy Data Envelopment Analysis, Izmir.