The late OLIVE JEAN DUNN, PhD, was Professor Emerita of Biostatistics and Biomathematics at the University of California, Los Angeles. Dr. Dunn's academic career spanned over forty years and included significant contributions to statistical research. She was a Fellow of the American Statistical Association, the American Association for the Advancement of Science, and the American Public Health Association, as well as coauthor of Applied Statistics: Analysis of Variance and Regression, Third Edition (Wiley).

VIRGINIA A. CLARK, PhD, is Professor Emerita of Biostatistics and Biomathematics at the University of California, Los Angeles. A Fellow of the American Statistical Association, Dr. Clark has coauthored over ninety journal articles and is coauthor of Applied Statistics: Analysis of Variance and Regression, Third Edition (Wiley).