METRON
INTERNATIONAL JOURNAL OF STATISTICS

FOUNDED IN 1920 BY
Corrado Gini

EDITOR-IN-CHIEF
Pier Luigi Conti
Univ. "La Sapienza" - Roma

ASSOCIATE EDITORS
Francesco Bartolucci, Univ. Perugia; Yves Berger, Univ. Southampton; Daniela Cocchi, Univ. Bologna; Dimitris Karlis, Athens Univ. of Economics and Business; Partha Lahiri, Univ. Maryland - College Park; Anna Clara Monti, Univ. Sannio – Benevento; Davy Paindaveine, Univ. Libre - Bruxelles; Ludovico Piccinato, “La Sapienza” Univ. - Roma; Yosef Rinott, Hebrew Univ. - Jerusalem; Alberto Roverato, Univ. Bologna; Ruey S. Tsay, Univ. Chicago; Ricardas Zitikis, Univ. Western Ontario - London (Ontario)

ADVISORY BOARD
Alan Agresti, Univ. Florida; Adelchi Azzalini, Univ. Padova; Barry C. Arnold, Univ. California – Riverside; Mario Badaloni, (Ed. 1991-2002); Carlo Benedetti, (Ed. 1981-1990); Raymond J. Carroll, Texas A&M Univ. - College Station; Joseph L. Gastwirth, George Washington Univ. - Washington; Alan Gelfand, Duke Univ. - Durham; Giovanni M. Giorgi, (Ed. 2003-2006); Samuel Kotz, George Washington Univ. - Washington; Kanti V. Mardia, Univ. Leeds; Karl Mosler, Univ. Köln; Yakov Nikitin, St. Petersburg Univ.; Pranab K. Sen, Univ. North Carolina - Chapel Hill; Alfredo Rizzi, “La Sapienza“ Univ. - Roma; Murad S. Taqqu, Boston Univ.

EDITORIAL STAFF
Marco Alfo' (Executive Ed.) "Sapienza" Univ. di Roma; Pierpaolo Brutti (Assistant Ed.) "Sapienza" Univ. di Roma; Paolo Giordani (Assistant Ed.) "Sapienza" Univ. di Roma; Valeria Sambucini (Assistant Ed.) "Sapienza" Univ. di Roma; Samantha Leorato (Assistant Ed.) Univ. di Roma Tor Vergata.