Reliability of the WAIS—R Factors

Abstract

The reliability coefficients of the three normative WAIS—R factors were computed at each age level of the standardization sample from a formula provided by Tellegen and Briggs. Analysis indicated that the two major factors, Verbal Comprehension and Perceptual Organization, possess excellent reliability at all age levels. The third factor, Freedom from Distractibility, possesses adequate reliability at all age levels. A table of reliability coefficients is presented for each age level and for the alternate compositions of the Perceptual Organization and the Freedom from Distractibility factors.