The gold standard in making causal inference on program effects is a randomized trial. Most randomization designs in education randomize classrooms or schools rather than individual students. Such "clustered randomization" designs have one principal drawback: They tend to have limited statistical power or precision. This study aims to…

Advocates of vouchers believe that public schools facing the threat of losing students and funding to private schools will take the measures necessary to raise student performance. Opponents worry that vouchers will actually leave public schools worse off by draining them of funds and encouraging the best students and the most involved parents to…