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Meta-Analysis of Candidate Gene Effects Using Bayesian Parametric and Non-Parametric Approaches

机译:使用贝叶斯参数和非参数方法对候选基因效应进行荟萃分析

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摘要

Candidate gene (CG) approaches provide a strategy for identification and characterization of major genes underlying complex phenotypes such as production traits and susceptibility to diseases, but the conclusions tend to be inconsistent across individual studies. Meta-analysis approaches can deal with these situations, e.g., by pooling effect-size estimates or combining P values from multiple studies. In this paper, we evaluated the performance of two types of statistical models, parametric and non-parametric, for meta-analysis of CG effects using simulated data. Both models estimated a “central” effect size while taking into account heterogeneity over individual studies. The empirical distribution of study-specific CG effects was multi-modal. The parametric model assumed a normal distribution for the study-specific CG effects whereas the non-parametric model relaxed this assumption by posing a more general distribution with a Dirichlet process prior (DPP). Results indicated that the meta-analysis approaches could reduce false positive or false negative rates by pooling strengths from multiple studies, as compared to individual studies. In addition, the non-parametric, DPP model captured the variation of the “data” better than its parametric counterpart.
机译:候选基因(CG)方法为鉴定和表征复杂表型下的主要基因(例如生产性状和疾病易感性)提供了一种策略,但是各个研究的结论往往不一致。荟萃分析方法可以处理这些情况,例如,通过合并效应量估计值或组合来自多个研究的P值。在本文中,我们评估了使用模拟数据对CG效应进行荟萃分析的两种统计模型(参数和非参数)的性能。两种模型都估计了“中心”效应量,同时考虑了各个研究的异质性。研究特定的CG效果的经验分布是多模式的。参数模型假设特定于研究的CG效应呈正态分布,而非参数模型通过使用Dirichlet过程先验(DPP)构成更一般的分布来放宽此假设。结果表明,与单独的研究相比,荟萃分析方法可通过汇集多项研究的优势来减少假阳性或假阴性率。此外,非参数DPP模型比其参数对应模型更好地捕获了“数据”的变化。

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