Article: A Multiple-Testing Procedure for High-Dimensional Mediation Hypotheses
Journal of the American Statistical Association. 2022 Jan. 2, v. 117, no. 537
2022
Abstract: Mediation analysis is of rising interest in epidemiologic studies and clinical trials. Among existing methods, the joint significance test yields an overly conservative Type I error rate and low power, particularly for high-dimensional mediation ... ...
Abstract | Mediation analysis is of rising interest in epidemiologic studies and clinical trials. Among existing methods, the joint significance test yields an overly conservative Type I error rate and low power, particularly for high-dimensional mediation hypotheses. In this article, we develop a multiple-testing procedure that accurately controls the family-wise error rate (FWER) and the false discovery rate (FDR) when testing high-dimensional mediation hypotheses. The core of our procedure is based on estimating the proportions of component null hypotheses and the underlying mixture null distribution of p-values. Theoretical developments and simulation experiments prove that the proposed procedure effectively controls FWER and FDR. Two mediation analyses on DNA methylation and cancer research are presented: assessing the mediation role of DNA methylation in genetic regulation of gene expression in primary prostate cancer samples; exploring the possibility of DNA methylation mediating the effect of exercise on prostate cancer progression. Results of data examples include well-behaved quantile-quantile plots and improved power to detect novel mediation relationships. An R package HDMT implementing the proposed procedure is freely accessible in CRAN. Supplementary materials for this article are available online. |
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Keywords | DNA methylation ; exercise ; gene expression regulation ; neoplasm progression ; prostatic neoplasms |
Language | English |
Dates of publication | 2022-0102 |
Size | p. 198-213. |
Publishing place | Taylor & Francis |
Document type | Article |
ZDB-ID | 2064981-2 |
ISSN | 1537-274X |
ISSN | 1537-274X |
DOI | 10.1080/01621459.2020.1765785 |
Database | NAL-Catalogue (AGRICOLA) |
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