| Institution: | 1.Department of Statistics and Applied Mathematics, Miguel Hernández University, Avda. del Ferrocarril, s/n, 03202 Elche, Spain. This author's research is supported by the Generalitat Valenciana (Pla Valencià d'Investigació Cient?′fica i Desenvolupament Tecnològic, Grant number GV-2000-51-1).,ES;2.CentER and Department of Econometrics, Tilburg University, P.O. Box 90153, 5000 LE Tilburg, The Netherlands.,NL;3.Corresponding author. Current address: Department of Applied Mathematics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands (E-mail: timmer@math.utwente.nl.),NL |
