Natchaya Ratasukharom Department of Statistics, Faculty of Science, Kasetsart University, Bangkok Thailand
Boonorm Chomtee Department of Statistics, Faculty of Science, Kasetsart University, Bangkok Thailand
Chantha Wongoutong Department of Statistics, Faculty of Science, Kasetsart University, Bangkok Thailand
Sudarat Nidsunkid Department of Statistics, Faculty of Science, Kasetsart University, Bangkok Thailand