This paper examines evidence on the effect of class size on student achievement. First, it is shown that results of quantitative summaries of the literature, such as Hanushek, depend critically on whether studies are accorded equal weight. Huanushek summarizes 277 estimates extracted from 59...

This paper examines evidence on the effect of class size on student achievement. First, it is shown that results of quantitative summaries of the literature, such as Hanushek, depend critically on whether studies are accorded equal weight. Huanushek summarizes 277 estimates extracted from 59...