[1] Aligarh Muslim Univ, Dept Stat & Operat Res, Aligarh, India
[2] Univ Bradford, Sch Management, Bradford, England
[3] Modibbo Adama Univ, Dept Operat Res, Yola, Nigeria
[4] Univ Northampton, Fac Business & Law, Northampton, England
[5] Jaipuria Inst Management, Dept Operat & Decis Sci, Jaipur, India