Building the Stock of College-Educated Labor Revisited
复制了Dynarski(2008)关于佐治亚和阿肯色州奖学金项目增加大学教育人口的研究，发现使用不同样本量(1%与5%的PUMS)结果存在差异，尤其对女性；并指出因聚类少且政策变化仅两次，聚类标准误严重低估置信区间。
In a recent paper in the Journal of Human Resources, Dynarski (2008) used data from the 1 percent 2000 Census Public Use Microdata Sample (PUMS) files to demonstrate that merit scholarship programs in Georgia and Arkansas increased the stock of college-educated individuals in those states. This paper replicates the results in Dynarski (2008) but we also find important differences in the results between the 1 percent and 5 percent PUMS, especially for women. We also demonstrate that the author's use of clustered standard errors, given the small number of clusters and only two policy changes, severely understates confidence intervals.