Linear regression in genetic association studies.
Linear regression in genetic association studies.
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DOI:
10.1371/journal.pone.0056976
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Bůžková P
中科院分区:
文献类型:
--
作者:
Bůžková P
In genomic research phenotype transformations are commonly used as a straightforward way to reach normality of the model outcome. Many researchers still believe it to be necessary for proper inference. Using regression simulations, we show that phenotype transformations are typically not needed and, when used in phenotype with heteroscedasticity, result in inflated Type I error rates. We further explain that important is to address a combination of rare variant genotypes and heteroscedasticity. Incorrectly estimated parameter variability or incorrect choice of the distribution of the underlying test statistic provide spurious detection of associations. We conclude that it is a combination of heteroscedasticity, minor allele frequency, sample size, and to a much lesser extent the error distribution, that matter for proper statistical inference.
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