Paulo Mourao University of Minho   Campus de Gualtar 4700 Braga Braga, 4700 Portugal   paulom@eeg.uminho.pt   http://www1.eeg.uminho.pt/economia/paulom/index2.htm           JEL Areas: C8 : Data Collection and Data Estimation Methodology; Computer Programs: General G1 : General Financial Markets: General (includes Measurement and Data)