1. Department of Economic and Social Statistics, University of Lodz, 90-214 Lodz, Poland
2. Centre of International Programmes, Széchenyi István University, 9026 Győr, Hungary
3. University School of Management Studies, Guru Gobind Singh Indraprastha University, New Delhi 110078, India
4. Graduate Studies and Research, Lebanese American University, Beirut 1102 2801, Lebanon
5. Department of Spatial Econometric, University of Lodz, 90-419 Lodz, Poland