Percent increase in proficiency resulting from use of selective devices

Abstract

The relationship of the mean standard score of selected applicants to the validity coefficient and selection ratio is discussed, and presented in graphic and tabular form. With a test validity as high as .50, a selection ratio of 10%, and a criterion score ratio (ratio of best to poorest worker) of 4 to 1, the expected improvement in criterion performance is only 23%. "Under optimal conditions, therefore, improvement in productivity as a result of a selection program can be considered to approximate 25%." (PsycInfo Database Record (c) 2025 APA, all rights reserved)