By using three-mode principal components analysis and perfect congruence analysis in conjunction, the factorial structure of the 11 correlation matrices of the Wechsler Intelligence Scale for Children-Revised was analyzed within a single framework. This allows a unified description showing both the strong similarities between the standardization samples and some small differences related to age. Furthermore, claims about comparability between the WISC-R factorial structure, the structures of other independently conducted stud ies, and those of several translations of the WISC-R were evaluated. Again the overall similarity was strik ing, albeit most studies showed lower explained vari ances. Some age effects seemed to be present here as well. The contribution of three-mode principal compo nents analysis was found to lie primarily in the simul taneous analysis of the standardization samples, while perfect congruence analysis allowed the evaluation of the strengths and the correlations of the common WISC-R components in all studies without encountering rotation problems.
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