Learning disability indices derived from a principal components analysis of the WISC--R: A study of learning disabled and normal boys.

Abstract
Learning disability indices derived from the factor score coefficients of the second factor secured from a principal components analysis of the WISC-R (Wechsler, 1974) in combination with the individual subtest scaled scores of 24 learning disabled boys were compared with the same indices obtained from the scores of the WISC-R standardization sample of normal boys. Reliable differences between these groups confirm the validity of this kind of measure.