1. Department of Applied Statistics and Econometrics, Faculty of Graduate Studies for Statistical Research, Cairo University, EGYPT
2. Quantitative Analysis Department, College of Business Administration, King Saud University, Riyadh, SAUDI ARABIA
3. Department of Mathematics, Rivers State University, Port Harcourt, NIGERIA
4. Biostatistics and Epidemiology, University of Medical Sciences, Ondo, Ondo State, NIGERIA
5. Department of Statistics, Federal Polytechnic of Oil and Gas, Bonny Island, Rivers State, NIGERIA