This study tested the theoretical model underly ing the Revised Illinois Test of Psycholinguistic Abilities (ITPA). The ITPA model is a hierarchical factor model which includes five first-order factors (Receptive Process, Organizing Process, Expressive Process, Closure, and Sequential Memory); two sec ond-order factors (Representational Level and Automatic Level); and one third-order factor (Psy cholinguistic Ability). Results from correlated mul tiple-group component analyses of the ITPA subtest intercorrelations for each age group in the standardization sample provided strong support for the theoretical model.
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