This study examined how much improvement was attainable with respect to accuracy of differential item functioning (DIF) measures and DIF detection rates in the Mantel-Haenszel procedure when employing focal and reference groups with notably unbalanced sample sizes where the focal group has a fixed small sample which does not satisfy the minimum…

This book summarizes the evaluation by the Committee on the General Aptitude Test Battery (GATB) of the National Research Council of the U.S. Employment Service's use of the GATB. The book serves professional users, policymakers, and students of psychometrics because of its clear and concise review of important issues. (SLD)