External validation of the equivalence of two computational formulas for a WAIS-R seven-subtest short form

Robin C. Hilsabeck, Deborah A. Schrager, William Drew Gouvier

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The usefulness of an abbreviated form of the Wechsler Adult Intelligence Scale-R (WAIS-R) has been noted by several researchers. A 7-subtest short form yielding estimates of Verbal, Performance, and Full Scale IQs (FSIQs) has shown good reliability and validity. Both weighted and prorated formulas have been used interchangeably to compute estimated IQs derived from this short form. The purpose of this study was to compare the equivalence of these formulas with the full WAIS-R in a mixed clinical sample. Results show that both formulas produce nearly identical results, with neither formula emerging as clearly superior over the other; validity coefficients for WAIS-R IQs ranged from .95 to .97. A very slight absolute advantage was noted for the prorated over the weighted formula in that it resulted in fewer IQ differences greater than 2 standard errors of measurement, fewer misclassifications of FSIQ, and stronger correlations with WAIS-R Verbal, Performance, and FSIQs.

Original languageEnglish (US)
Pages (from-to)239-242
Number of pages4
JournalApplied Neuropsychology
Volume6
Issue number4
DOIs
StatePublished - Dec 1 1999

Keywords

  • Equations
  • Formulas
  • Seven-subtest short form
  • WAIS-R

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology
  • Developmental and Educational Psychology
  • Arts and Humanities (miscellaneous)

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