I'm not trying to say there's no correlation from some subgroups. Obviously there is.
I'm trying to say that if you're trying to predict performance in a new environment (college) you can improve the prediction by correcting for factors (bad home environment during high school) that affect current test scores but won't be active in the future.
How large the correction should be can only be answered by large population studies.
Good point. It would be extremely useful to be able to pinpoint factors that are transient vs. those that stay with someone and continue to affect future performance..
I'm trying to say that if you're trying to predict performance in a new environment (college) you can improve the prediction by correcting for factors (bad home environment during high school) that affect current test scores but won't be active in the future.
How large the correction should be can only be answered by large population studies.