Aliasuddin Aliasuddin Syiah Kuala University   Kopelma Darussalam, Syiah Kuala Banda Aceh, Aceh 23111 Indonesia   aliasuddin@unsyiah.ac.id   http://s3ie.unsyiah.ac.id/profil-prodi-die-feb-unsyiah           JEL Areas: B4 : Economic Methodology: General C4 : Econometric and Statistical Methods: Special Topics