A new approach to the problem of multiple comparisons in the genetic dissection of complex traits - PubMed (original) (raw)
Comparative Study
A new approach to the problem of multiple comparisons in the genetic dissection of complex traits
J I Weller et al. Genetics. 1998 Dec.
Abstract
Saturated genetic marker maps are being used to map individual genes affecting quantitative traits. Controlling the "experimentwise" type-I error severely lowers power to detect segregating loci. For preliminary genome scans, we propose controlling the "false discovery rate," that is, the expected proportion of true null hypotheses within the class of rejected null hypotheses. Examples are given based on a granddaughter design analysis of dairy cattle and simulated backcross populations. By controlling the false discovery rate, power to detect true effects is not dependent on the number of tests performed. If no detectable genes are segregating, controlling the false discovery rate is equivalent to controlling the experimentwise error rate. If quantitative loci are segregating in the population, statistical power is increased as compared to control of the experimentwise type-I error. The difference between the two criteria increases with the increase in the number of false null hypotheses. The false discovery rate can be controlled at the same level whether the complete genome or only part of it has been analyzed. Additional levels of contrasts, such as multiple traits or pedigrees, can be handled without the necessity of a proportional decrease in the critical test probability.
Comment in
- Using the false discovery rate approach in the genetic dissection of complex traits: a response to Weller et al.
Zaykin DV, Young SS, Westfall PH. Zaykin DV, et al. Genetics. 2000 Apr;154(4):1917-8. doi: 10.1093/genetics/154.4.1917. Genetics. 2000. PMID: 10950641 Free PMC article. No abstract available.
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