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Linear regression techniques and continuous norning were used to develop a procedure to estimate age-adjusted WAIS-R IQ scores from the Shipley Institute of Living Scale. The estimation procedure was derived on a mixed psychiatric sample of 100 inpatients in a Veteran's Administration hospital setting and then was replicated on an independent sample of 50 psychiatric inpatients. Estimated scores based on the cross-validation sample correlated.87 and.85, respectively, with WAIS-R Full Scale scaled scores and IQs and did not over predict, which indicates a high degree of concordance between these two procedures. The estimation procedure also compared favorably to five other techniques initially developed for use with the WAIS or Wechsler-Bellevue. In light of this favorable outcome, this estimation procedure is recommended for use in clinical and research settings in which a brief but accurate IQ estimate is desired.
Zachary et al. (Mon,) studied this question.