Class size

The effect of university class size on performance.

We therefore estimate non-linear class size effects controlling for unobserved heterogeneity of both individual students and faculty. We find that: (i) at the average class size, the effect size is ?.108; (ii) the effect size is however negative and significant only for the smallest and largest ranges of class sizes and zero over a wide range of intermediate class sizes from 33 to 104; (iii) students at the top of the test score distribution are more affected by changes in class size, especially when class sizes are very large