1. Faculty of Graduate Studies for Statistical Research, Cairo University, Giza 12613, Egypt
2. Department of Quantitative Analysis, College of Business Administration, King Saud University, P.O. Box 71115, Riyadh 11587, Saudi Arabia
3. Department of Mathematics, University de Caen Normandie, Campus Ⅱ, Caen 14032, France
4. Central Agency for Public Mobilization & Statistics (CAPMAS), Cairo, Egypt