> for the Non-Submitters they tended to show a weaker relationship, essentially under- predicting the college GPA I wonder if that's at least partially due to

> for the Non-Submitters they tended to show a weaker relationship, essentially under- predicting the college GPA I wonder if that's at least partially due to non-submitters choosing not to submit because they did worse than expected on the test, compared to how they did on practice tests. Even assuming no exogenous events like a bad night's sleep, test anxiety, etc, your SAT score is still an estimate of your "true" score, with some variance. If you have an expected score due to taking practice tests, and your measured score is significantly lower just because you happened to fall on the left part of your own personal score distribution for the real test, maybe you decide not to submit your score. If that happens systematically, but SAT score really is correlated with success, you would expect nonsubmitters to outperform their score.