Comparison of WAIS-III Short Forms for Measuring Index and Full-Scale Scores

Author:

Girard Todd A.1,Axelrod Bradley N.2,Wilkins Leanne K.3

Affiliation:

1. Ryerson University, Toronto, Ontario, Canada,

2. John D. Dingell Department of Veterans Affairs Medical Center, Detroit, MI, USA

3. Ryerson University, Toronto, Ontario, Canada

Abstract

This investigation assessed the ability of the Wechsler Adult Intelligence Scale—Third Edition (WAIS-III) short forms to estimate both index and IQ scores in a large, mixed clinical sample ( N = 809). More specifically, a commonly used modification of Ward’s seven-subtest short form (SF7-A), a recently proposed index-based SF7-C and eight-subtest short form (SF8) were evaluated. All three SFs proved adequate for estimating verbal comprehension, perceptual organization, and full-scale intelligence within considerably less time relative to an SF11 that provides full measurement of WAIS index scores. The SF7-A provided the best combination overall in terms of psychometric performance and estimated time savings. However, SF8 best represents all four factors and allows measurement of processing speed. The SF7-C was most hampered by inclusion of the Block Design subtest in the current assessment, but may prove advantageous in future extensions to the WAIS-IV.

Publisher

SAGE Publications

Subject

Applied Psychology,Clinical Psychology

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