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AI 根据所提供的论文材料归类:摘要直接研究右删失结局下的条件平均处理效应与异质性因果效应估计。

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关注这篇论文的作者
Yuming Sun
Jian Kang
Yi Li

利用深度生存学习器估计生存结局的异质性处理效应

研究问题
右删失生存数据中,如何联合估计随时间变化的条件平均处理效应轨迹,减少逐个时点单独估计的不稳定性?
方法与思路
作者构造处理删失的双重稳健伪结局,以共享表示的多输出神经网络学习效应轨迹,并用交叉拟合降低过拟合影响。
材料陈述的贡献
摘要称,方法给出逐点及联合时间估计误差界,平滑条件下联合学习可改善稳定性,并展示模拟和肺癌研究应用。
阅读关注点
应核对时间特定 CATE 的结局定义、删失与处理识别条件、双重稳健的具体范围,以及联合误差界所需平滑条件。
阅读边界
所据为 arXiv 预印本,同行评审或期刊接收未核实;摘要未完整说明删失假设,双重稳健仍要求正确处理删失机制。

原文摘要

Estimating heterogeneous treatment effects in survival settings is complicated by right censoring as well as the time-varying nature of the estimand. While the conditional average treatment effect (CATE) provides a natural target, most existing approaches focus on a single prespecified time point and do not account for the temporal trajectory, leading to instability in estimation. We propose a deep survival learner (DSL) for estimating heterogeneous treatment effects with right-censored outcomes. The method is based on a doubly robust pseudo-outcome whose conditional expectation identifies time-specific CATEs under standard assumptions. This construction remains unbiased if either the outcome model or the treatment assignment model is correctly specified, when properly accounting for censoring. To estimate CATEs over a clinically relevant time spectrum, DSL employs a multi-output deep neural network with shared representations, enabling joint estimation of treatment effect trajectories. From a theoretical perspective, we derive error bounds for both pointwise and joint estimation over time. We show that joint estimation can leverage temporal structure to control estimation error without incurring much additional approximation cost under smoothness conditions, leading to improved stability relative to separate estimation. Cross-fitting is incorporated to reduce overfitting and mitigate bias arising from flexible nuisance estimation. Simulation studies demonstrate favorable finite-sample performance, particularly under nuisance model misspecification. Applied to the Boston Lung Cancer Study, DSL reveals heterogeneity in the effects of perioperative chemotherapy across patient characteristics and over time.

笔记与分组
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