Kerripat, since you seem to have studied this a bit, I have a question. I have seen studies like you mention that show somewhere around an 80% relationship btwn WISC scores and CogAT scores, but I've never seen any data where they took out kids who scored very highly on one or the other and looked to see if the relationship was still that high.
I wonder with all of the stories of high WISC scoring kids who test much lower on the CogAT if the relationship is still that high as kids move very far away from the mean. Do you know if that has ever been studied? I did see one study that is linked on Hoagies that found a negative correlation with IQ on the OLSAT for highly gifted kids whereas there was a strong positive correlation with IQ for average kids or when the entire population was included not just kids who are far from the mean.
