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arXiv 1101.0905stat.ME
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Laplace近似EM微阵列分析:比较微阵列实验的经验贝叶斯方法

Laplace Approximated EM Microarray Analysis: An Empirical Bayes Approach for Comparative Microarray Experiments

Haim Bar, James Booth, Elizabeth Schifano, Martin T. Wells

摘要:

一个两组混合效应模型的比较(标准化)微阵列数据从两个治疗组被认为是。在文献中出现的大多数竞争参数方法是作为特例或通过对所提出的模型进行微小修改而获得的。近似极大似然拟合是通过一种快速和可扩展的算法,我们称之为LEMMA(拉普拉斯近似EM微阵列分析)。从模型中得出的治疗$\times$基因相互作用的后验几率涉及相互作用和基因特异性误差方差的收缩估计。基于后验几率和局部错误发现率(f.d.r.)有固定的截止值我们基于模型的方法还允许通过控制错误发现率(FDR)来声明基因的非空状态。它是在一个详细的模拟研究表明,该方法优于知名的竞争对手。我们还提出了两个先前分析的微阵列的例子应用所提出的方法。扩展所提出的方法配对治疗和多个治疗进行了讨论。

英文摘要:

A two-groups mixed-effects model for the comparison of (normalized) microarray data from two treatment groups is considered. Most competing parametric methods that have appeared in the literature are obtained as special cases or by minor modification of the proposed model. Approximate maximum likelihood fitting is accomplished via a fast and scalable algorithm, which we call LEMMA (Laplace approximated EM Microarray Analysis). The posterior odds of treatment $\times$ gene interactions, derived from the model, involve shrinkage estimates of both the interactions and of the gene specific error variances. Genes are classified as being associated with treatment based on the posterior odds and the local false discovery rate (f.d.r.) with a fixed cutoff. Our model-based approach also allows one to declare the non-null status of a gene by controlling the false discovery rate (FDR). It is shown in a detailed simulation study that the approach outperforms well-known competitors. We also apply the proposed methodology to two previously analyzed microarray examples. Extensions of the proposed method to paired treatments and multiple treatments are also discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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