Is there a correlation between the results of the Cognitive Abilities Test (CogAT) and the results of The Iowa Tests?
Tables of correlations are available in the CogAT Research Handbook. From the correlations it is quite clear that most students score at or near the same percentile rank on The Iowa Tests and CogAT. Average correlations with the ITBS Composite score are 0.83 for the Verbal Battery, 0.77 for the Quantitative Battery, and 0.71 for the Nonverbal Battery. For ITED average correlations with the Composite score are 0.84 for the Verbal Battery, 0.75 for the Quantitative Battery, and 0.70 for the Nonverbal Battery. Clearly, the relationship is substantial. The Nonverbal Battery, with its lower correlations, appears to be a good indicator of ability that is somewhat less dependent on academic achievement.
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