مؤلف: Richard F. Gunst

ROBERT L. MASON, Ph D, is Institute Analyst at Southwest Research Institute in San Antonio, Texas. RICHARD F. GUNST, Ph D, is a professor in the Department of Statistical Science at Southern Methodist University in Dallas, Texas. JAMES L. HESS, Ph D, is Staff Vice President, Operations, at Leggett & Platt Inc. in Carthage, Missouri.