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Assessment
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Estimation of Wechsler Adult Intelligence Scale-Ill Index Scores with the 7-Subtest Short form in a Clinical Sample

Bradley N. Axelrod

John D. Dingell

Department of Veterans Affairs Medical Center, Detroit, Michigan

Joseph J. Ryan

Central Missouri State University, Warrensburg, Missouri

L. Charles Ward

Tuscaloosa Department of Veterans Affairs Medical Center, Tuscaloosa, Alabama

A 7-subtest short form of the Wechsler Adult Intelligence Scale-III (WAIS-III) previously demonstrated good comparability in estimating Full Scale and Verbal IQ summary scores, with adequate comparability in estimating Performance IQ. In a mixed clinical sample of 295 patients, the current study assessed the equivalence of the index scores generated from the full and prorated WAIS-III. The results revealed correlations corrected for redundancy of .90, .86, .87, and .75 for the Verbal Comprehension (VCI), Perceptual Organization (POI), Working Memory (WMI), and Processing Speed (PSI) indexes, respectively. Although the 7-subtest short form of the WAIS-III was not designed to estimate index scores, adequate estimates are viable for VCI, POI, and WMI when the goal is to obtain group, rather than individual, data points.

Key Words: WAIS-ILI • intelligence • short forms • index scores • assessment

Assessment, Vol. 7, No. 2, 157-161 (2000)
DOI: 10.1177/107319110000700207
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