The Journal of King Mongkut's University of Technology North Bangkok
วารสารวิชาการพระจอมเกล้าพระนครเหนือ

Busarakam Pratansup
Department of Statistics, Faculty of Commerce and Accountancy, Chulalongkorn University, Bangkok,
Thailand

Vitara Pungpapong
Department of Statistics, Faculty of Commerce and Accountancy, Chulalongkorn University, Bangkok,
Thailand