Enareta Kurtbegu University of Evry-Val d'Essonne, EPEE, TEPP-CNRS   4, Bvd. Francois Mitterrand Bureau 316, Bat. Ile-de-France Evry, 91025 France   enareta.kurtbegu@univ-evry.fr             JEL Areas: C4 : Econometric and Statistical Methods: Special Topics G1 : General Financial Markets: General (includes Measurement and Data)