The multiple linear regression method was used to derive a short form for the Wechsler Intelligence Scale for Children-Revised in a sample of 300 children receiving treatment and/or evaluation at a university-affiliated community mental health center. The predictive validity of this approach was examined via a crossvalidation that included 300 additional subjects taken from the same population, as well as two short-form regression equations taken from the work of Kennedy and Elder (1982), and a short form derived from the Wechsler normative sample (Kaufman, 1976). Correlations and standard errors of the estimates are reported for both the original and cross-validational samples, and it is pointed out that crossvalidations of this kind result in empirical assessments of shrinkage, as opposed to the theoretical estimates provided by various shrinkage formulae. It is also suggested that there are two distinct types of shrinkage that need to be accounted for in the conduct of short-form research and that, in concentrating on the issue of part-whole shrinkage, prior studies in the area have virtually ignored the issue of cross-validational shrinkage.
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