Covariate balancing for causal inference on categorical and continuous treatments
分类与连续处理因果推断中的协变量平衡AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接研究分类和连续处理的因果对比及剂量效应,并以协变量平衡和逆概率加权进行估计。
分类与连续处理因果推断中的协变量平衡AI 解读 ↓
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We propose novel estimators for categorical and continuous treatments by using an optimal covariate balancing strategy for inverse probability weighting. The resulting estimators are shown to be consistent and asymptotically normal for causal contrasts of interest, either when the model explaining treatment assignment is correctly specified, or when the correct set of bases for the outcome models has been chosen and the assignment model is sufficiently rich. For the categorical treatment case, we show that the estimator attains the semiparametric efficiency bound when all models are correctly specified. For the continuous case, the causal parameter of interest is a function of the treatment dose. The latter is not parametrized and the estimators proposed are shown to have bias and variance of the classical nonparametric rate. Asymptotic results are complemented with simulations illustrating the finite sample properties. Our analysis of a data set suggests a nonlinear effect of BMI on the decline in self reported health.