Data from college admissions tests can provide a valuable measure of student achievement, but the non-representativeness of test-takers is an important concern. We examine selectivity bias in both state-level and school-level SAT and ACT averages. The degree of selectivity may differ importantly across and within schools, and across and within…

Using research findings and statistics to support a policy argument often leads to misinterpretations and exaggerations of public school performance. Two experts illustrate this point by discussing examples of distorted high school drop-out rates, student performance on standardized tests, and international comparisons of U.S. and Japanese…