Institution: | aCentER and Department of Econometrics and Operations Research, Tilburg University, P.O. Box 90153, 5000 LE Tilburg, The Netherlands;bDepartment of Econometrics and Operations Research, VU University Amsterdam, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands;cDepartamento de Estatística e Investigación Operativa, Universidade de Vigo, 36200 Vigo, Spain |