College performance predictions and the SAT

The methods used in most SAT validity studies cannot be justified by any sample selection assumptions and are uninformative about the source of the SATʹs predictive power. A new omitted variables estimator is proposed; plausibly consistent estimates of the SATʹs contribution to predictions of University of California freshman grade point averages are about 20% smaller than the usual methods imply. Moreover, much of the SATʹs predictive power is found to derive from its correlation with high school demographic characteristics: The orthogonal portion of SAT scores is notably less predictive of future performance than is the unadjusted score.