WISC-R factor structures (Principal Factor Analysis-Varimax rotation) were compared for previously diagnosed samples of learning disabled Navajo and Papago children. Both two- and three-factor solutions were analyzed, utilizing coefficients of congruence. Both groups were similar in terms of proportion of common factor variance accounted for by a general factor, and the Verbal-Performance distinction was demonstrated in both groups.
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Zarske et al. (1981) studied this question.
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