Building the Stock of College-Educated Labor Revisited
复制了Dynarski(2008)关于佐治亚州和阿肯色州奖学金项目增加大学教育人口的研究，发现1%和5%人口普查样本结果存在差异，且聚类标准误的使用严重低估了置信区间。
Abstract 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.