Amjad Mahmood
Department of Statistics, National College of Business Administration and Economics, Lahore, Pakistan.; Hailey College of Commerce, University of the Punjab, Lahore, Pakistan.
Nadia Mushtaq
Department of Statistics, Forman Christian College (A Chartered University),Lahore,Pakistan
Muhammad Hanif
Department of Statistics, National College of Business Administration and Economics,Lahore,Pakistan
Farhad Hussain
Department of Management Science and Engineering, Hebei University,Baoding, Hebei,China