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。
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.
标准倾向评分匹配(Standard propensity score matching)用来创建一个高度可比的对照组。
Standard propensity score matching was used to create a highly comparable control group.
给匹配结果评分是一个复杂的主题，很多优秀的开发人员对各种相关问题进行了不懈的研究，目的就是要提高搜索结果的质量。
Scoring of match results is a complex subject with dozens of brilliant minds working on a variety of relevant problems to increase the quality of search results.
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