研究表明，高权益流离失所的工人通常会产生大量的长期收益损失。由于这些损失变得越来越明显，政策制定者具有明显扩大的培训资源，其中大部分地区发生在普通社区大学课程中。为了分析这种培训的有效性，我们将行政盈利记录与在1990年代上半年在华盛顿州的上半年流离失所的工人的社区学院成绩单记录。我们探讨了回归模型统计规范的几个问题，量化了社区学院学分对收益的影响。These include (i) how to allow for a transition period immediately after the end of workers’ schooling when their earnings may be temporarily depressed, (ii) whether earnings gains are strictly proportional to credits earned, and (iii) how to model worker-specific unobserved heterogeneity. In our preferred specification, we find that the equivalent of an academic year of community college schooling raises the long-term earnings of displaced workers by an average of about 9 percent for men and about 13 percent for women. However, these average returns mask substantial variation in the returns associated with different types of courses. On the one hand, we estimate that an academic year of more technically oriented vocational and academic math and science courses raise earnings by about 14 percent for men and 29 percent for women. On the other hand, we estimate that less technically oriented courses yield very low and possibly zero returns. About one third of the increase in earnings associated with more technically oriented vocational and academic math and science courses is estimated to be due to increases in wage rates, with the remainder attributable to increased hours of work.