“…The most important advantage of DEA method is the fact that it does not make any possible assumptions related to the structure of the production function (Reverte & Guzman, 2010). At the beginning DEA that has been used to measure the efficiency of the non-profit corporations (Charnes, Cooper, & Rhodes, 1981;Lewin & Morey, 1981), afterwards has also been used in the measurement of the relative efficiencies of the profit making corporations conducting activities in different sectors (Chandara, Cooper, Li, & Rahman, 1998;Drake & Howcroft, 1994;Shammari, 1999;Zhu, 2000;Keh & Chu, 2003;Düzakın & Düzakın, 2007;Önüt & Soner, 2007;Kao & Hwang, 2008).…”