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分类依据与纠错

AI 根据所提供的论文材料归类:摘要明确将平均风险率作为治疗效应的因果目标,并提出协变量调整与双重稳健推断。

反馈分类问题

正在核对关联版本…

代码、数据与补充材料

正在核对对应版本的资源…

关注这篇论文的作者
Xiang Meng
Lu Tian
Kenneth Kehl
Hajime Uno

非比例风险下平均风险率的高效去偏学习

研究问题
当风险不成比例、Cox 风险比的解释受随访和删失影响时,如何对具有总体人时事件率解释的平均风险率开展灵活调整与推断?
方法与思路
作者构建半参数双重稳健框架,推导平均风险率的有效影响函数,并结合交叉拟合、机器学习与去偏估计进行协变量调整。
材料陈述的贡献
摘要称,在乘积收敛率条件下估计量具有根号样本量一致性和渐近正态性,并以模拟及黑色素瘤治疗比较展示应用。
阅读关注点
应核对平均风险率的时间范围、因果识别与删失处理条件、双重稳健性的具体含义,以及辅助模型所需的乘积收敛率。
阅读边界
依据 arXiv 预印本摘要,同行评审或接收未核实;具体识别条件和数值结果未说明,模拟覆盖表现不能替代条件核验。

原文摘要

The hazard ratio from the Cox proportional hazards model is a ubiquitous summary of treatment effect. However, when hazards are non-proportional, the hazard ratio can lose a stable causal interpretation and become study-dependent because it effectively averages time-varying effects with weights determined by follow-up and censoring. We consider the average hazard (AH) as an alternative causal estimand: a population-level person-time event rate that remains well-defined and interpretable without assuming proportional hazards. Although AH can be estimated nonparametrically and regression-style adjustments have been proposed, existing approaches do not provide a general framework for flexible, high-dimensional nuisance estimation with valid sqrt{n} inference. We address this gap by developing a semiparametric, doubly robust framework for covariate-adjusted AH. We establish pathwise differentiability of AH in the nonparametric model, derive its efficient influence function, and construct cross-fitted, debiased estimators that leverage machine learning for nuisance estimation while retaining asymptotically normal, sqrt{n}-consistent inference under mild product-rate conditions. Simulations demonstrate that the proposed estimator achieves small bias and near-nominal confidence-interval coverage across proportional and non-proportional hazards settings, including crossing-hazards regimes where Cox-based summaries can be unstable. We illustrate practical utility in comparative effectiveness research by comparing immunotherapy regimens for advanced melanoma using SEER-Medicare linked data.

笔记与分组