Affiliation: | 1. Department of Statistics, Faculty of Mathematics and Physics, Charles University in Prague, Prague, Czech Republic;2. Institute of Stochastics, Karlsruhe Institute of Technology, Karlsruhe, Germany;3. Department of Economics, National and Kapodistrian University of Athens, Athens, Greece;4. Unit for Business Mathematics and Informatics, North-West University, Potchefstroom, South Africa |