Education production functions are estimated using student-level achievement data for Japanese students, with emphasis on estimating the causal effect of class size on students' academic performance. The empirical results show that students‟ test scores are strongly affected by individual...

This study introduces a piecewise-linear relationship between student achievement and class size. Using student-level data from Japan, we find that piecewise-linear specifications clearly show a better fit to the data. We also find that a significant class-size effect is observed in the lower...