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Burns, Gary W.; Watson, Billy L. – Journal of Learning Disabilities, 1973
Evaluated was whether factor analysis of the 12 Illinois Test of Psycholinguistic Abilities subtest scores earned by 90 underachieving children (between 5 and 10 years of age) would support the dimensions of psycholinguistic processes, organizational levels, and communication channels as described in the clinical model of the instrument. (Author)
Descriptors: Children, Exceptional Child Research, Learning Disabilities, Test Interpretation

Rennick, Phillip M.; And Others – Adolescence, 1978
Factor analyses of the WISC, ITPA, and PIAT, revealed that 85 percent of the total variance of these tests can be accounted for by an abbreviated battery of 12 of the 26 subtests. Results indicated a very tight relationship between academic achievement and academic aptitude, even in underachievers. (Author/SJL)
Descriptors: Academic Aptitude, Achievement Tests, Correlation, Elementary School Students