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AI 根据所提供的论文材料归类:摘要利用因果图分析疫苗效果估计中的检测选择偏差,并提出分层识别与估计。

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关注这篇论文的作者
Mengxin Yu
Tom Hongyi Liu
Kendrick Qijun Li
Nicholas Jewell
Dylan Small
Xu Shi
Bingkai Wang

多种检测原因下的检测阴性设计:统计偏差与解决方法

研究问题
检测阴性设计同时纳入因症状、强制筛查或接触者追踪而检测的人群时,标准比值比估计是否仍能衡量疫苗效果?
方法与思路
作者结合统计推导、因果图与数值演示,区分三类检测原因及其效应目标,并提出按原因分层的一致估计方法。
材料陈述的贡献
摘要称忽略检测原因可能导致偏差,并讨论何时各层目标对应同一疫苗效果,以及适当合并分层信息提高精度的方法。
阅读关注点
应核对各检测原因对应的目标人群、选择机制及识别条件,并确认跨层合并估计同一疫苗效果所需的限制。
阅读边界
依据 arXiv 预印本摘要,同行评审及期刊接收未核实;摘要未说明各类目标的具体表达式或消除偏差的完整条件。

原文摘要

Test-negative designs are widely used for post-market evaluation of vaccine effectiveness, particularly in cases when randomized trials are not feasible. Differing from classical test-negative designs where only healthcare-seekers with symptoms are included, recent test-negative designs have involved individuals with various reasons for testing, especially in an outbreak setting. While including these data can increase sample size and hence improve precision, concerns have been raised about whether they introduce bias into the current framework of test-negative designs, thereby demanding a formal statistical examination of this modified design. In this article, using statistical derivations, causal graphs, and numerical demonstrations, we show that the standard odds ratio estimator may be biased if various reasons for testing are not accounted for. To eliminate this bias, we identify three categories of reasons for testing, including symptoms, mandatory screening, and case contact tracing, and characterize associated statistical properties and estimands. Based on our characterization, we show how to consistently estimate each estimand via stratification. Furthermore, we describe when these estimands correspond to the same vaccine effectiveness parameter, and, when appropriate, propose a stratified estimator that can incorporate multiple reasons for testing and improve precision. The performance of our proposed method is demonstrated through simulation studies.

笔记与分组
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