Construct validity of the Illinois test of psycholinguistic abilities for a clinic population

Abstract

The construct validity of the 10 primary ITPA subtests was investigated on a clinic population of 91 (66 males, 25 female) learning disabled children. Construct validity was determined by the degree to which each subtest measured discrete, independent abilities and the extent of subtest relationship to academic subject areas. Results via factor analysis and correlational analyses generally support the independence of the channel dimension, i.e., visual vs. auditory. While the process dimension, i.e., receptive, expressive, and associative, was not found to be an independent measure, the dimension of levels, i.e., representational vs. automatic, was substantiated for this clinical population. Implications of discrepancies in the channel dimension are discussed.

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