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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确以平均处理效应、逆概率加权和双重稳健估计为核心,直接属于因果推断。

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关注这篇论文的作者
Kazuharu Harada
Hironori Fujisawa

因果推断中平均处理效应的抗异常值估计

研究问题
逆概率加权与双重稳健估计容易受到异常值影响,在严重污染及污染比例随协变量变化时,如何稳健估计平均处理效应?
方法与思路
作者将密度幂加权引入逆概率加权和双重稳健估计,并研究估计方程无偏性、偏差修正及影响函数。
材料陈述的贡献
摘要称所提估计量在严重污染下仍具有抗异常值能力,并指出直接扩展双重稳健估计需要修正才能保留双重稳健性。
阅读关注点
应核对污染模型、目标效应在污染下的定义、密度幂参数选择,以及偏差修正保留双重稳健性的具体条件。
阅读边界
这是预印本,同行评审未核验;摘要未给出污染范围、调参规则及数值结果,不能据此确认普遍优于其他方法。

原文摘要

The inverse probability (IPW) and doubly robust (DR) estimators are often used to estimate the average causal effect (ATE), but are vulnerable to outliers. The IPW/DR median can be used for outlier-resistant estimation of the ATE, but the outlier resistance of the median is limited and it is not resistant enough for heavy contamination. We propose extensions of the IPW/DR estimators with density power weighting, which can eliminate the influence of outliers almost completely. The outlier resistance of the proposed estimators is evaluated through the unbiasedness of the estimating equations. Unlike the median-based methods, our estimators are resistant to outliers even under heavy contamination. Interestingly, the naive extension of the DR estimator requires bias correction to keep the double robustness even under the most tractable form of contamination. In addition, the proposed estimators are found to be highly resistant to outliers in more difficult settings where the contamination ratio depends on the covariates. The outlier resistance of our estimators from the viewpoint of the influence function is also favorable. Our theoretical results are verified via Monte Carlo simulations and real data analysis. The proposed methods were found to have more outlier resistance than the median-based methods and estimated the potential mean with a smaller error than the median-based methods.

笔记与分组
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