Abstract
Performed an analysis of published data on the WAIS to ascertain whether the highly reliable Information and Vocabulary subtests can function as measures of intelligence in their own right. The median criterion-related validity coefficients of these two subtests were found to be 0.38. The Verbal and Full Scale IQs had median validity coefficients that surprisingly were not appreciably higher (.41 and 0.38, respectively). It was concluded that the addition of more WAIS subtests to a battery that already includes Information or Vocabulary will not result in any increase in predictive validity and that these additional tests, therefore, lack incremental validity.
Published Version
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