1. a Econometric Institute, Erasmus University Rotterdam , PO Box 1738, NL-3000 DR Rotterdam, The Netherlands
2. b Central Bank of Indonesia and University of Indonesia , Jl. M.H. Thamrin No. 2, Jakarta 10350, Indonesia
3. c Institute of Statistics, Catholic University of Louvain , Voie du Roman Pays 20, B-1348 Louvain- la-Neuve, Belgium