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Activity Number: 537 - Innovative Statistical Methods for Complex -Omics Data
Type: Topic Contributed
Date/Time: Thursday, August 6, 2020 : 1:00 PM to 2:50 PM
Sponsor: International Chinese Statistical Association
Abstract #312508
Title: Knockoff Scan Statistic Framework for Controlled Whole-Genome Sequencing Data Analysis
Author(s): Zihuai He* and Iuliana Ionita-laza and Linxi Liu
Companies: Stanford University and Columbia University and Columbia University
Keywords: Scan statistic; Whole genome sequencing; Knockoff; False discovery rate; Linkage disequilibrium; Causal effect
Abstract:

The analysis of whole-genome sequencing studies is challenging due to the large number of noncoding rare variants, our limited understanding of their functional effects, and the lack of natural units for testing. Existing methods based on FWER control and marginal association tests often suffer from insufficient power owing to the expansion of the multiple testing problem, and increased risk of false positives due to the presence of linkage disequilibrium. We propose a scan statistic framework and a sequential Model-X knockoff statistic generator for whole-genome sequencing data analysis. The proposed method is able to simultaneously detects the existence and localizes association signals at genome-wide scale with guaranteed FDR control, and to significantly reduce false discoveries due to linkage disequilibrium.


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