Prediction of verbal, performance, and full scale IQs from seven subtests of the WAIS-R.

The Wechsler Adult Intelligence Scale-Revised (Wechsler, 1981) was given to 70 male VA patients, and IQs were estimated from seven subtests that require about half the administration time of the full test. Estimates correlated well with Verbal, Performance, and Full Scale IQs, and mean estimated IQs differed by less than 1 IQ point from actual means. Error sizes in predicting Full Scale IQs were small (M = 1.96) and exceeded 4 IQ points in only 3 cases. In comparison, error sizes for the Doppelt (1956) abbreviation (M = 3.71) were significantly larger and were greater than 4 IQ points in 20 cases.