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Assessment
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Cross Validation of Prediction Equations for Wechsler Memory Scale-Ill Indexes

Bradley N. Axelrod

John D. Dingell

Department of Veterans Affairs Medical Center, Detroit, MI

Joseph J. Ryan

Central Missouri State University

John L. Woodard

Finch University of Health Sciences-Chicago Medical School

Six prediction equations were previously found to predict to Wechsler Memory Scale-III (WMS-3) Immediate Memory Index (IM) and General Memory Index (GM) using twoor three-subtest combinations. The equations were cross-validated on a sample of 214 mixed clinical patients from an entirely different location in the Midwest. The two three-subtest prediction equations (including Logical Memory, Verbal Paired Associates, and either Faces or Family Pictures) better estimated IM and GM than did the two-subtest equations (Logical Memory and Verbal Paired Associates). Correlations for the former equations correlated .97 and .96 with full WMS-3 IM and GM, respectively. In addition, at least 95% of the predicted scores were within two SEMs of obtained IM and GM scores. The twosubtest equations correlated only .89 for IM and .92 for GM. The predicted scores that fell within two SEMs captured 78% and 88% of the cases for IM and GM, respectively. The results provide support for the use of the three-subtest prorated forms of the WMS-3 to estimate IM and GM.

Key Words: Wechsler Memory Scale • memory • assessment • short forms

Assessment, Vol. 8, No. 4, 367-372 (2001)
DOI: 10.1177/107319110100800402
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