1. Dept. of Statistics and Computer Science, Univ. of Veterinary and Animal Sciences, Lahore 54000, PK e-mail: mazam72@yahoo.com
2. Dept. of Statistics, GC University, Lahore 54000, PK, e-mail: aarshadstat@gmail.com
3. Dept. of Statistics, Faculty of Sciences, King Abdulaziz University, Jeddah 21551, SA (Corresponding author), e-mail: aslam_ravian@hotmail.com