Abstract
The structure and composition of profile types most representative of the 2,200 children (6 years 0 months to 16 years 11 months) comprising the normative sample for the Wechsler Intelligence Scale for Children—Third Edition (WISC-III) are identified. Profiles from the 10 mandatory WISC-III subtests are sorted according to similar shape and level using multistage cluster analysis with independent replications. The final solution of eight most common (or core) profile types fulfills all formal heuristic and statistical criteria, including complete coverage, satisfactory within-type homogeneity, between-type dissimilarity, and replicability. Profile types are described according to population prevalence, ability level, subtest configuration; and each type is examined for membership trends by child demography, family characteristics, and unusual IQ discrepancies. Two methods are given for determining the relative uniqueness of WISC-III profile patterns in future research and clinical work. The article concludes with a case example using the method recommended for “everyday” decision making.
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