Unbiased estimation of odds ratios: combining genomewide association scans with replication studies.
Unbiased estimation of odds ratios: combining genomewide association scans with replication studies.
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DOI:
10.1002/gepi.20394
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发表时间:
2009-07
影响因子:
2.1
通讯作者:
Dudbridge, Frank
中科院分区:
文献类型:
--
作者:
Bowden, Jack;Dudbridge, Frank
Odds ratios or other effect sizes estimated from genome scans are upwardly biased, because only the top-ranking associations are reported, and moreover only if they reach a defined level of significance. No unbiased estimate exists based on data selected in this fashion, but replication studies are routinely performed that allow unbiased estimation of the effect sizes. Estimation based on replication data alone is inefficient in the sense that the initial scan could, in principle, contribute information on the effect size. We propose an unbiased estimator combining information from both the initial scan and the replication study, which is more efficient than that based just on the replication. Specifically, we adjust the standard combined estimate to allow for selection by rank and significance in the initial scan. Our approach explicitly allows for multiple associations arising from a scan, and is robust to mis-specification of a significance threshold. We require replication data to be available but argue that, in most applications, estimates of effect sizes are only useful when associations have been replicated. We illustrate our approach on some recently completed scans and explore its efficiency by simulation. Genet. Epidemiol. 33:406–418, 2009. © 2009 Wiley-Liss, Inc.
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DOI:
10.1111/1467-9876.00197
发表时间:
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