1. Department of Econometrics, Faculty of Political Sciences, Sakarya University, Sakarya, Turkey
2. Department of Econometrics, Faculty of Economics and Administrative Sciences, Ataturk University, Erzurum, Turkey
3. Department of Statistics, Faculty of Science, Necmettin Erbakan University, Konya, Turkey
4. Department of Management Information Systems, Faculty of Economics and Administrative Sciences, Ataturk University, Erzurum, Turkey