Do reductions in class size raise students’ test scores? Evidence from population variation in Minnesota's elementary schools
Economics of Education Review Volume 31, Number 3, ISSN 0272-7757 Publisher: Elsevier Ltd
Many U.S. states and cities spend substantial funds to reduce class size, especially in elementary (primary) school. Estimating the impact of class size on learning is complicated, since children in small and large classes differ in many observed and unobserved ways. This paper uses a method of to assess the impact of class size on the test scores of grade 3 and 5 students in Minnesota. The method exploits random variation in class size due to random variation in births in school and district catchment areas. The results show that reducing class size increases mathematics and reading test scores in Minnesota. Yet these impacts are very small; a decrease of ten students would increase test scores by only 0.04–0.05 standard deviations (of the distribution of test scores). Thus class size reductions are unlikely to lead to sizeable increases in student learning.
Cho, H., Glewwe, P. & Whitler, M. (2012). Do reductions in class size raise students’ test scores? Evidence from population variation in Minnesota's elementary schools. Economics of Education Review, 31(3), 77-95. Elsevier Ltd.