Correcting special ability test scores for general ability

Abstract

A formula is presented for correcting for the effect of general intelligence in a special ability test, the effect of which is to raise the special ability score of an individual who is below the mean on the general ability test and vice versa. It serves to reduce the correlation between general ability test scores and corrected special ability test scores to zero, thereby eliminating the variance contributed by general intelligence from a special ability or aptitude test. It is suggested that corrected special ability test scores will be found most useful in the prediction of success in the semi-skilled trades and in routine clerical jobs. (PsycInfo Database Record (c) 2025 APA, all rights reserved)