Characterizing selection bias using experimental data
Characterizing selection bias using experimental data
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DOI：
10.2307/2999630
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发表时间：
1998-09-01
期刊：
影响因子：
6.1
通讯作者：
Todd, P
中科院分区：
文献类型：
--
作者：
Heckman, J;Ichimura, H;Todd, P
半参数的方法来估计使用非实验性的比较组来评估社会计划，并测试识别的假设，证明匹配，选择模型，和方法的差异中的差异所产生的偏差。使用的数据从一个原型的社会计划的实验和非实验性的比较组的数据，我们拒绝的假设证明匹配和我们的extensionsit.The证据支持的选择偏差模型和假设，证明一个半参数版本的差异的方法的差异。我们扩展我们的分析，考虑普通观测数据的方法的应用。
Semiparametric methods are developed to estimate the bias that arises from using nonexperimental comparison groups to evaluate social programs and to test the identifying assumptions that justify matching, selection models, and the method of difference-in-differences. Using data from an experiment on a prototypical social program and data from nonexperimental comparison groups, we reject the assumptions justifying matching and our extensions of it. The evidence supports the selection bias model and the assumptions that justify a semiparametric version of the method of difference-in-differences. We extend our analysis to consider applications of the methods to ordinary observational data.