Reliable Dimensions for Wisc Profiles

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Abstract
Measures of multivariate reliability are calculated for profiles of WISC subscales on three age groups. Profile dimensions based on reliability considerations are also established and matched across age groups and with factor analytic dimensions. While all possible differences among individual subscales are quite unreliable (about .51), a reduced set of five uncorrelated dimensions can be found with a more satisfactory reliability (about .87). In unrotated form, the maximally reliable dimension is essentially total IQ and the second maximally reliable dimension closely resembles a verbal-performance contrast. Four of the five rotated dimensions give a good match across age groups and with Verbal Comprehension, Relevancy, Perceptual Organization and Maze-specific factors. Guidelines for the interpretation and use of WISC subscale profiles are provided for both clinical and research uses.

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