A Yudin-type short form of the WISC-R: two aspects of validation.

Provided validity data for a Yudin-type short form of the WISC-R for N equal to 70 middle-class children (34 males and 36 females, X age equal to 7.6 years, SD equal to 2.58 months) of above-average intelligence (means: VIQ equal to 115.55, PIQ equal to 122.27, FIQ equal to 121.02). Short- to long-form validity coefficients were all above .90 for Verbal, Performance, and Full Scale IQ scores. Highly similar predictive validity coefficients were found for the short and long forms of the WISC-R when compared with the Metropolitan Achievement and Otis Lennon Mental Ability tests. In contrast, little support was found for the validity of the short-form profile data as assessed by Cattell's rp coefficient of profile similarity.