Utilizing data from the WISC-R standardization sample (Wechsler, 1974), Gutkin (1978) presented formulae to calculate factorially pure verbal comprehension, perceptual organization, and freedom from distractibility deviation quotients. Data are presented concerning standard errors of measurement and the score discrepancies that are required for statistical significance between these WISC-R scores.
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Terry B. Gutkin (1979) studied this question.