We estimate the causal impact of school and classroom gender composition on achievement. We take advantage of the random assignment of Korean middle school students to single-sex schools, co-educational (coed) schools with single-sex classes, and coed schools with mixed-gender classes. Male...

We estimate the causal impact of school and classroom gender composition on achievement. We take advantage of the random assignment of Korean middle school students to single-sex schools, co-educational (coed) schools with single-sex classes, and coed schools with mixed-gender classes. Male...

This paper provides a long-term follow-up of students who participated in the Tennessee STAR experiment. The Tennessee STAR experiment randomly assigned 11,600 elementary school students and their teachers to a small class, regular-size class or regular-size class with a teacher-aide. The...