To determine the equivalence and relationship of Peabody and WISC scores in a retarded population, 49 students in a class for the educable retarded were tested. The Peabody IQ consistently over-estimated WISC Verbal, Performance, and Full Scale IQs. Intercorrelations between IQs from the two tests were disappointingly low. A more cautious approach to use of the Peabody as a “substitute” measure for the WISC is suggested.
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