The Factors of the Illinois Test of Psycholinguistic Abilities: A Comparison of 18 Factor Analyses

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Abstract
This study factor analyzed the correlation matrices of a number of studies involving the ITPA. All of the correlation matrices were analyzed on the same program using the same criteria to examine trends between studies. More factors tended to appear as chronological age increased. Although there was little consistency of factor structure between age groups, analysis of three groups at the same age level produced a reasonable amount of consistency. Analysis of the channel, level, and process dimensions of the ITPA revealed that channel differentiation was best achieved for all age levels. For age groups above CA 6–0, it appears that the ITPA was moderately successful in assessing some of the dimensions for which it was intended.

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