1. Rosaria Lombardo is Associate Professor of Statistics, Economics Department, University of Campania L. Vanvitelli, via Gran Priorato di Malta, Capua (CE), Italy
2. Eric J. Beh is Professor of Statistics and Head of Statistics discipline, School of Mathematical and Physical Sciences, University of Newcastle, Callaghan, 2308, New South Wales, Australia
3. Pieter M. Kroonenberg is Emeritus Professor of Multivariate Data Analysis, The Three-Mode Company, University of Leiden, Wasstraat 11, 2313 JG Leiden, The Netherlands