I don't think that the population here represents the population at large. With that caveat, from reading many threads here, it would seem that the CogAT is an iffy indicator of what an IQ score might be. CogAT is not supposed to be an IQ test, but rather a group "learned ability" test.
In our case, we did find CogAT to correctly identify DD's greatest area of strength. DD had very high scores on the CogAT verbal (high 99%) and WISC VCI (qualified for extended norms). Her nonverbal CogAT score was her next highest, and her PRI was very high also (but lower than verbal). Her quantitative was the lowest, but it was not low. Her CogAT composite was a 99%, and her WISC FSIQ was DYS level, with a higher GAI.
So I think that the CogAT gave us a clue that she might also do well on an IQ test, but not with precision (the CogAT ceiling is lower than the WISC ceiling). But the strengths WERE accurate, and they do match what I see in real life.
