Emmanouil Trachanas Department of Economics, Aristotle University of Thessaloniki   Aristotle University of Thessaloniki Department of Economics P.O. Box 178, GR-54124, Thessaloniki, Greece Thessaloniki, 54124 Greece   etrachan@econ.auth.gr   http://users.auth.gr/etrachan/           JEL Areas: C1 : Econometric and Statistical Methods: General C5 : Econometric Modeling: General