Affiliation: | 1. Department of Statistics, Faculty of MathematicsPontificia Universidad Católica de Chile, Casilla 306, Correo 22, Santiago, Chile.;2. Department of Probability and Mathematical StatisticsFaculty of Mathematics and Physics, Charles University in Prague, Sokolovska 83, CZ‐186 75 Praha 8 ’ Karlín, Czech Republic. |