Feyyaz Zeren Sakarya University   Sakarya University, İŞletme Fakültesi, SAKARYA Sakarya, 54187 Turkey   feyyazzeren@outlook.com   www.fzeren.sakarya.edu.tr/en           JEL Areas: C3 : Multiple or Simultaneous Equation Models: General C4 : Econometric and Statistical Methods: Special Topics