Scores from two (Vocabulary, Block Design) and four (Arithmetic, Vocabulary, Block Design, and Picture Arrangement) subtest short forms of the WAIS—R were compared with the Full Scale IQs for vocational rehabilitation clients, 305 mentally retarded, emotionally disturbed, and physically handicapped subjects. Some large differences between mean IQs, some low correlations between IQs once corrected for spuriousness, and high misclassification rates suggest caution in using the short-form IQs. Use of the Full Scale IQ for screening vocational rehabilitation clients is recommended.
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Clayton et al. (1986) studied this question.
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