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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确在多单位多时期面板中使用合成控制估计反事实生存轨迹和因果效应。

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代码、数据与补充材料

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关注这篇论文的作者
Jessy Xinyi Han
Devavrat Shah

合成生存控制:面向事件发生时间反事实的合成控制扩展

研究问题
面对删失、小样本和非随机治疗安排,如何估计干预改变事件发生时间的效果,尤其在多单位、多时期及不同治疗并存的面板环境中?
方法与思路
作者提出合成生存控制,将目标单位的反事实风险率轨迹表示为其他单位观测轨迹的加权组合,并以低秩面板框架支持因果生存分析。
材料陈述的贡献
摘要称,低秩框架下目标效应可识别且有有限样本保证;跨国癌症治疗应用中,新疗法可及性与低于合成对照的干预后风险率相关。
阅读关注点
应核对删失机制、低秩结构及供体轨迹的可用性,治疗时序与混杂的识别要求,以及风险率目标、权重构造和有限样本保证的范围。
阅读边界
这是 arXiv 预印本,同行评审及期刊接收均未核验;摘要未说明完整识别和删失条件,也未提供效应数值,应用中的关联仍需核对因果依据。

原文摘要

Estimating causal effects on time-to-event outcomes from observational data is particularly challenging due to censoring, limited sample sizes, and non-random treatment assignment. The need for answering such "when-if" questions--how the timing of an event would change under a specified intervention--commonly arises in real-world settings with heterogeneous treatment adoption and confounding. To address these challenges, we propose Synthetic Survival Control (SSC) to estimate counterfactual hazard trajectories in a panel data setting where multiple units experience potentially different treatments over multiple periods. In such a setting, SSC estimates the counterfactual hazard trajectory for a unit of interest as a weighted combination of the observed trajectories from other units. To provide formal justification, we introduce a panel framework with a low-rank structure for causal survival analysis. Indeed, such a structure naturally arises under classical parametric survival models. Within this framework, for the causal estimand of interest, we establish identification and finite sample guarantees for SSC. We validate our approach using a multi-country clinical dataset of cancer treatment outcomes, where the staggered introduction of new therapies creates a quasi-experimental setting. Empirically, we find that access to novel treatments is associated with improved survival, as reflected by lower post-intervention hazard trajectories relative to their synthetic counterparts. Given the broad relevance of survival analysis across medicine, economics, and public policy, our framework offers a general and interpretable tool for counterfactual survival inference using observational data.

笔记与分组
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