Petr Blahus, PhD, was DrSc, Professor, Division of Methodology, in the Faculty of Physical Education and Sport, Charles University, Prague, Czech Republic. A distinguished international scholar, he published in Czech, English, and Russian.

Bruce L. Brown, PhD, is Professor of Psychology at Brigham Young University and authored Multivariate Analysis for the Biobehavioral and Social Sciences (Brown, Hendrix, Hedges, and Smith, 2012, Wiley).

C. Victor Bunderson, PhD, is emeritus professor of Instructional Psychology and Technology at Brigham Young University. He served on the Assessment Council of Western Governors University from 1997 through 2023. His experience includes VP Research Management at Educational Testing Service, and cofounder of several technology companies that advanced and applied concepts and methods explained in this book.

Joseph A. Olsen, PhD, is Associate Research Professor, Assistant Dean, and Director of Research Support in the College of Family, Home, and Social Sciences at Brigham Young University. Dr. Olsen advises on methods and software in graduate research projects across many departments.