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Long-Term Stability of Membership in a Wechsler Intelligence Scale for Children–Third Edition (WISC-III) Subtest Core Profile Taxonomy

Although often applied in practice, clinically based cognitive subtest profile analysis has failed to achieve empirical support. Nonlinear multivariate subtest profile analysis may have benefits over clinically based techniques, but the psychometric properties of these methods must be studied prior to their implementation and interpretation. The current study posed the following question: Is Wechsler Intelligence Scale for Children–Third Edition (WISC-III) cluster membership based on nonlinear multivariate subtest profile analysis stable over a 3-year period? Membership stability to a subtest taxonomy, including constancy of displaying an unusual profile, was based on data from 585 students. General (.39) and partial (.26 to .51) kappa coefficients either failed to reach statistical significance or indicated poor classification stability, with the exception of two profile types. It was concluded that, with these two possible exceptions, profile-type membership to an empirically derived WISC-III subtest taxonomy should not be used in interpretation or educational decision making.