Institution: | a Department of Statistics, Faculty of Mathematics and Computer Science, Amirkabir University of Technology, 424, Hafez Ave., Tehran 15914, Iran b Statistical Research and Training Center, Tehran, Iran c Instituto de Alta Investigación, Universidad de Tarapacá, Casilla 7D, Arica, Chile d Department of Mathematics and Computer Science, Amirkabir University of Technology, 424, Hafez Ave., Tehran 15914, Iran |