arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2407.06970stat.ME
收藏

存在误分类二元中介变量时的效应估计

Effect estimation in the presence of a misclassified binary mediator

Kimberly A. Hochstedler Webb, Martin T. Wells

AI总结:

针对二元中介变量误分类问题,提出三种无需金标准标签的校正方法,并应用于妊娠期高血压中介效应研究。

摘要:

中介分析使研究者能够量化暴露变量通过中介变量对结果变量的效应。如果二元中介变量被误分类,所得分析结果可能产生严重偏倚。当误分类是差异性的且没有金标准标签可用时,处理误分类尤为困难。以往工作通过敏感性分析框架或假设误分类率已知来解决此问题。我们利用与误分类机制相关的变量,在不使用金标准标签的情况下恢复无偏参数估计。所提出的方法要求一个合理假设:敏感度与特异度之和大于1。我们提出了三种校正方法:(1)针对正态结果模型的普通最小二乘校正,(2)多步预测值加权方法,(3)无缝期望最大化算法。我们将误分类校正策略应用于研究妊娠期高血压在母亲年龄与早产关联中的中介作用。

英文摘要:

Mediation analyses allow researchers to quantify the effect of an exposure variable on an outcome variable through a mediator variable. If a binary mediator variable is misclassified, the resulting analysis can be severely biased. Misclassification is especially difficult to deal with when it is differential and when there are no gold standard labels available. Previous work has addressed this problem using a sensitivity analysis framework or by assuming that misclassification rates are known. We leverage a variable related to the misclassification mechanism to recover unbiased parameter estimates without using gold standard labels. The proposed methods require the reasonable assumption that the sum of the sensitivity and specificity is greater than 1. Three correction methods are presented: (1) an ordinary least squares correction for Normal outcome models, (2) a multi-step predictive value weighting method, and (3) a seamless expectation-maximization algorithm. We apply our misclassification correction strategies to investigate the mediating role of gestational hypertension on the association between maternal age and pre-term birth.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑