Stability of validity indices through test score ranges

Abstract

Effects of correction for restriction in range and variability of validity evidence throughout the predictor score range were examined in a sample of 16,230 inexperienced life insurance agents. The predictor variable was the Aptitude Index Battery (a biographical inventory) and the criterion was 1-year objective sales production. Data displayed nonlinearity and heteroscedasticity. Although variations in the validity coefficients and the slopes within the restricted samples were observed, these were generally accounted for by sampling error. When analyzed with linear regression techniques, data showed stronger relationships between the predictor and criterion at the upper score range; however, when analyzed with techniques appropriate for nonlinear, heteroscedastic data, validity evidence indicated better predictability at lower score ranges. Increasing the truncation of the distribution yielded increasingly overestimated slopes and corrected correlations. Influences of nonlinearity and heteroscedasticity and implications for the use of the direct restriction of range correction formula are discussed. (PsycInfo Database Record (c) 2025 APA, all rights reserved)