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Naglieri and Bornstein (2003) investigated the correlations between individually administered tests of intelligence and achievement reported in various test manuals and published journal articles. In their review they divided the papers into two groups: studies involving correlations between (a) IQ and achievement test composites and (b) IQ and achievement subtests. Within these two areas, data were further divided into studies involving small (n < 200) and large (n > 200) samples. For the large studies, the ability/achievement composite correlations for the K-ABC (.74) followed by the CAS and WJ-III (both .70) were the top ranked. Results for the large-scale ability and achievement subtest studies demonstrated that the CAS (Standard and Basic Batteries, respectively) had the highest correlations with achievement subtests (.65 and.64), followed by the K-ABC (.63). Thus, the two measures of cognitive processing consistently had the highest correlations with achievement despite the fact that they do not contain achievement-like subtests found in all the other ability measures. They concluded that measures of basic psychological processes offer a viable alternative to traditional IQ for the correlation with achievement.
References & BibliographyEdit
Naglieri, J.A. and Bornstein, B.T. (2003).Intelligence and Achievement: Just how Correlated are they? Journal of Psychoeducational Assessment, Vol. 21, No. 3, 244-260