This paper uses the propensity score matching method to solve the endogenous problem effectively, basing on the panel data of listed companies from 2005 to 2012.
基于2005—2012年上市公司的面板数据，本文采用倾向评分匹配的方法，有效解决了样本“内生性”问题。
The paper USES the propensity score-matching method to estimate the effects on training on rural labor's earnings based on micro data of Jilin Province in 2006.
基于2006年吉林省进城务工人员调查数据，采用倾向分匹配法对农民工的培训收入效应进行估算。
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