Wp# 0057MSS-253-2008 July 20, 2008 THE UNIVERSITY OF TEXAS AT SAN ANTONIO, COLLEGE OF BUSINESS Working Paper SERI ES ONE UTSA CI RCLE SAN ANTONI O, TEXAS 78249-0631 210 458-4317 | BUSI NESS.UTSA.EDU Copyright ©2006 by the UTSA College of Business. All rights reserved. This document can be downloaded without charge for educational purposes from the UTSA College of Business Working Paper Series (business.utsa.edu/wp) without explicit permission, provided that full credit, including © notice, is given to the source. The views expressed are those of the individual author(s) and do not necessarily reflect official positions of UTSA, the College of Business, or any individual department. Ricardo Leiva Departamento de Matem´atica F.C.E., Universidad Nacional de Cuyo 5500 Mendoza, Argentina Anuradha Roy Department of Management Science and Statistics The University of Texas at San Antonio One UTSA Circle San Antonio, TX 78249, USA Department of Management Science & Statistics, University of Texas at San Antonio, San Antonio, TX 78249, U.S.A An Extension of the Traditional Classification Rules: the Case of Non-Random Samples