The mean variance components of the WISC-R were calculated from normative data and compared with previously reported mean variance components of the WISC. Only slight differences were noted in the mean variance components of the two tests. Both the WISC and WISC-R subtests appear to possess relatively less specific variance than do several other psychological tests. It does not appear that the patterning of WISC-R subtests will be any less frustrating than patterning on the WISC.
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