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- W2062656095 abstract "In recent years, genome-wide association studies (GWAS) have uncovered a large number of susceptibility variants. Nevertheless, GWAS findings provide only tentative evidence of association, and replication studies are required to establish their validity. Due to this uncertainty, researchers often focus on top-ranking SNPs, instead of considering strict significance thresholds to guide replication efforts. The number of SNPs for replication is often determined ad hoc. We show how the rank-based approach can be used for sample size allocation in GWAS as well as for deciding on a number of SNPs for replication. The basis of this approach is the ranking probability: chances that at least j true associations will rank among top u SNPs, when SNPs are sorted by P-value. By employing simple but accurate approximations for ranking probabilities, we accommodate linkage disequilibrium (LD) and evaluate consequences of ignoring LD. Further, we relate ranking probabilities to the proportion of false discoveries among top u SNPs. A study-specific proportion can be estimated from P-values, and its expected value can be predicted for study design applications." @default.
- W2062656095 created "2016-06-24" @default.
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- W2062656095 date "2011-09-01" @default.
- W2062656095 modified "2023-10-14" @default.
- W2062656095 title "Novel Rank-Based Approaches for Discovery and Replication in Genome-Wide Association Studies" @default.
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- W2062656095 doi "https://doi.org/10.1534/genetics.111.130542" @default.
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