Variations in students' performance across different school sectors—specifically, public, private religious, and private nonreligious schools—has long been an important topic in the sociology of education. In recent years, debate over the merits of each sector has increased between advocates and critics of school choice, as exemplified by current struggles over educational vouchers and their ramifications for public policy and politics. What has been lacking in this debate, however, has been a theoretically grounded empirical analysis of the factors that affect student success across...