A learning disability index (LD1) for the assessment of intellectual deficits on the WISC-R is described. The Factor II score coefficients derived from an unrotated principal components analysis of the WISC-R normative data, in combination with the individual's scaled scores, are used for this purpose. The population parameters of this index then allow for the assessment of the abnormality of the LDI in the individual case, as well as for the evaluation of the statistical significance of any change in the LDI from test to re-test.
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