Improving efficiency and robustness of the doubly robust estimator for a population mean with incomplete data
改进不完整数据下总体均值双重稳健估计的效率与稳健性
Abstract Considerable recent interest has focused on doubly robust estimators for a population mean response in the presence of incomplete data, which involve models for both the propensity score and the regression of outcome on covariates. The usual doubly robust estimator may yield severely biased inferences if neither of these models is correctly specified and can exhibit nonnegligible bias if the estimated propensity score is close to zero for some observations. We…