Q: Is there a correlation between the results of the CogAT® Form 6 and the results of The Iowa Tests®?
A: The relationship is substantial at all grades. Tables of these correlations are found in the CogAT Form 6, Research Handbook. The tables show that the CogAT Composite score has the highest correlation with achievement (except for mathematics achievement). The Nonverbal Battery has the lowest correlation with achievement and appears to be a good indicator of ability that is somewhat less dependent on academic achievement.
Average correlations between CogAT and the Iowa Tests of Basic Skills® Composite scores are .83 for the Verbal Battery, .77 for the Quantitative Battery, .69 for the Nonverbal Battery, and .85 for the CogAT Composite. Average correlations with the Iowa Tests of Educational Development® Composite score are .81 for the Verbal Battery, .75 for the Quantitative Battery, .70 for the Nonverbal Battery, and .84 for the CogAT Composite.
Q: Does CogAT measure students' innate abilities?
A: No. All abilities are developed through experience. CogAT measures students' abilities to reason with words, quantitative concepts, and nonverbal (spatial) pictures. These abilities are developed through experiences within and outside of school.
Q: Is CogAT an IQ test? Are SAS scores IQ scores?
A: No. CogAT measures reasoning abilities. Although these abilities are central to all definitions of intelligence, the word intelligence implies much more. However, psychologists have never agreed on the definition of intelligence, so how much more should be included in an intelligence test is often debated. Further, the notion of IQ comes from an earlier set of procedures for indexing the rate of mental development. CogAT does not use these procedures. The SAS scale used on CogAT provides normalized Standard Age Scores for that fraction of the population that attends school. Although SAS scores are very helpful for professionals, nonprofessionals can confuse them with IQ scores, so they are generally not reported to parents and lay organizations. Percentile ranks and stanines are better suited for general audiences.