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arXiv 1909.06950stat.ME
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两样本汇总数据孟德尔随机化的弱工具稳健检验

Weak-Instrument Robust Tests in Two-Sample Summary-Data Mendelian Randomization

Sheng Wang, Hyunseung Kang

摘要:

孟德尔随机化(MR)是遗传流行病学中的一种流行方法,使用遗传变异作为工具变量(IV)来估计暴露对结果的影响,其中双样本汇总数据MR最受欢迎。不幸的是,MR研究中的工具通常与暴露量弱相关,这可能会使效应估计值出现偏差并增加第一类错误。在这项工作中,我们提出的检验统计量是强大的弱工具渐近扩展的Anderson-Rubin,Kleibergen,和条件似然比检验在计量经济学两个样本的汇总数据MR。我们还使用建议的Anderson-Rubin测试开发一个点估计和检测无效的工具。我们的结论与模拟和实证研究表明,建议的测试控制的大小,并有更好的权力比现有的方法与弱工具。

英文摘要:

Mendelian randomization (MR) has been a popular method in genetic epidemiology to estimate the effect of an exposure on an outcome using genetic variants as instrumental variables (IV), with two-sample summary-data MR being the most popular. Unfortunately, instruments in MR studies are often weakly associated with the exposure, which can bias effect estimates and inflate Type I errors. In this work, we propose test statistics that are robust under weak instrument asymptotics by extending the Anderson-Rubin, Kleibergen, and the conditional likelihood ratio test in econometrics to two-sample summary-data MR. We also use the proposed Anderson-Rubin test to develop a point estimator and to detect invalid instruments. We conclude with a simulation and an empirical study and show that the proposed tests control size and have better power than existing methods with weak instruments.

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。

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