Abbreviation of the WAIS for clinical use: An attempt at validation

Abstract

PROBLEM I n a recent study, Satz and Mogel@) constructed an abbreviated form of the WAIS in which all scales and subtests were represented. The attempt was to obviate a shortcoming in previous abbreviated forms which used only those combinations of subtests (usually four) that provided maximal correlations with Full Scale IQ(4). Such procedures have limitations, except for research application, by virtue of their emphasis on single I& indices. By representing all scales and subtests in the recent abbreviated form, the clinician is provided with the complete breadth of intellectual functions as measured by the WAIS. This was done by using selected items on nine of the WAIS subtests while leaving the Digit Span and Digit Symbol subtests intact. Correlations with the respective WAIS Scales were: Verbal I& = .99, Performance IQ = .97, and Full Scale I& = .99. I t was further shown that this abbreviated form correlates highly with the standard Full Scale WAIS regardless of intellectual level or diagnostic classification.One methodological problem remains, however, in that a rescoring procedure (as in many of the previous WAIS short forms) was used in validating the present abbreviated form. For example, the assumption is often implied that a subject would perform the same regardless of whether the short form were administered separately or merely rescored from the standard form. In the present abbreviated form, wherein less than 50% of the standard WAIS items are used, factors such as fatigue, set, time, and change in the continuity of item difficulty could have obvious effects on performance. Using a test-retest design, this study attempts to evaluate the influence of these or other factors. This was done by presenting the abbreviated items separately for criterion comparison with the standard WAIS form. METHODSubjects. Files from a large N P Veterans Administration Hospital were drawn for Ss who had previous test-retest scores on the WAIS. This sample (N = 30) represented the control group and consisted of 18 schizophrenics (Mean I& = 83.33)

A block rotation task: The application of multivariate and decision theory analysis for the prediction of organic brain disorder.

“…Educational level was included because of its relationship to socioeconomic level and general intelligence (Griffith & Taylor, 1960b). The three test variables were the Abbreviation of the WAIS for Clinical Use (Mogel & Satz, 1963;Satz & Mogel, 1962), the Trail Making Test (TMT) (Armitage, 1946;Reitan, 1958), and the MFDT (Graham & Kendall,I960),4 Only the Performance IQ Scale of the Abbreviated WAIS was administered; this was to insure a nonverbal psychometric IQ control for the BRT. Pearson ;• correlations between the Abbreviated and original WAIS forms have been reported as follows (Satz & Mogel, 1962): Verbal IQ = .99; Performance IQ = .97; Full Scale IQ = .99.…”

Validity of two selected‐item short forms of the WAIS‐III in an intellectually deficient sample

“…Not only does this make it unclear how an individual's performance would be altered by administering only those items scored on the short form, but it also leaves unclear the logistics of such an administration. Mogel and Satz (1963) recognized and addressed the assumption of expected performance on short forms in their publication of a study that used a test-retest method to compare full administration with short form administration of the WAIS. In the discussion of their results, they report similar predictive power of the Satz-Mogel (1962) short form whether rescored from a full administration or administered independently.…”

“…In the discussion of their results, they report similar predictive power of the Satz-Mogel (1962) short form whether rescored from a full administration or administered independently. However, they fail to describe the independent short form administration procedures (Mogel & Satz, 1963). Therefore, the clinical use of selected-item short forms remains questionable.…”

Further validation of the Ohio Literacy Test: Correlation with the Wechsler Adult Intelligence Scale and grade achieved in school

“…It is composed of 50 sentences of increasing difficulty in vocabulary and comprehension. I n terms of its accuracy, a previous study (2) reported substantial correlation between the OLT and other tests. However, these results were attenuated by correlations performed using several intelligence tests, based on 85 Ss.…”