AAPL: Assessing Association between P-value Lists.

AAPL: Assessing Association between P-value Lists.
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DOI:
10.1002/sam.11180
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发表时间:
2013-04-01
影响因子:
1.3
通讯作者:
Shen, Shihao
Shen, Shihao
中科院分区:
计算机科学4区
文献类型:
--
作者:
Yu, Tianwei;Zhao, Yize;Shen, Shihao

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高通量数据集的联合分析产生了评估两长列p值之间关联的需求。在这类p值列表中,绝大多数特征是不显著的。理想情况下,在两次测试中都为无效的特征的影响应降至最低。然而,由于随机因素,它们的p值在0到1之间均匀分布,并且由于用于生成多个数据集的高通量技术中固有的偏差,p值可能存在弱相关性。基于秩的一致性检验可能会捕捉到这种不良影响。使用硬性截断值生成的列联表检验可能对任意阈值的选择很敏感。我们开发了一种基于局部错误发现率的特征水平一致性的新方法。关联得分具有直观的解释。该方法在模拟中显示出更高的统计功效来检测p值列表之间的关联。我们通过实际数据分析展示了它的实用性。该方法的R语言实现可在http://userwww.service.emory.edu/~tyu8/AAPL/获取。
Joint analyses of high-throughput datasets generate the need to assess the association between two long lists of p-values. In such p-value lists, the vast majority of the features are insignificant. Ideally contributions of features that are null in both tests should be minimized. However, by random chance their p-values are uniformly distributed between zero and one, and weak correlations of the p-values may exist due to inherent biases in the high-throughput technology used to generate the multiple datasets. Rank-based agreement test may capture such unwanted effects. Testing contingency tables generated using hard cutoffs may be sensitive to arbitrary threshold choice. We develop a novel method based on feature-level concordance using local false discovery rate. The association score enjoys straight-forward interpretation. The method shows higher statistical power to detect association between p-value lists in simulation. We demonstrate its utility using real data analysis. The R implementation of the method is available at http://userwww.service.emory.edu/~tyu8/AAPL/.
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