A comparative factor analysis of the WISC-R by sex and age with learning disabled children

WISC-R data were factor analyzed for a sample of 980 learning disabled subjects aged 9 through 14. Separate analyses were conducted for the total sample, males only, females only, and age-level groupings. The three-factor solution (Verbal Comprehension, Perceptual Organization, and Freedom from Distractibility), previously identified in normal samples, was found to be appropriate for the learning disabled subjects in the present study for the total sample and the sex and age groupings. The Verbal Comprehension factor emerged as the most robust followed by Perceptual Organization and Freedom from Distractibility.