Heckman , J . J . ( 1979 ), Sample selection bias as a specification error , Econometrica, 47, 153 - 161.
样本选择偏差, 一看就知道是个很重要的问题嘛, 排名第五, 不算亏待.
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Propensity scores are used to reduce selection bias by equating groups based on these covariates.
倾向得分通过平衡各组的协变量的方法,用于降低选择偏倚.
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