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Activity Number:
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313
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Type:
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Invited
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Date/Time:
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Tuesday, July 31, 2007 : 2:00 PM to 3:50 PM
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Sponsor:
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Section on Bayesian Statistical Science
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| Abstract - #307656 |
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Title:
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Simultaneous Inference for Multiple Testing and Clustering via a Dirichlet Process Mixture Model
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Author(s):
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David B. Dahl*+ and Qianxing Mo and Marina Vannucci
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Companies:
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Texas A&M University and Texas A&M University and Texas A&M University
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Address:
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Department of Statistics, College Station, TX, 77843-3143,
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Keywords:
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Bayesian nonparametrics ; Correlated hypothesis tests ; Mod
el-based clustering ; Multiple comparisons
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Abstract:
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We propose a Bayesian nonparametric model which exploits clustering for increased sensitivity in multiple hypothesis testing. We build on Dahl and Newton (2005) who showed that this was feasible by modeling the dependence among objects through clustering and then estimating hypothesis-testing parameters averaged over clustering uncertainty. We propose several improvements. First, we separate the clustering of the regression coefficients from the accommodation of heteroscedasticity. Second, our model accommodates more general experimental designs, such as permitting covariates and not requiring independent sampling. Third, we provide a more satisfactory treatment of nuisance parameters and hyperparameters. Finally, we do not require the designation of a reference treatment. The proposed method is compared in a simulation study to ANOVA and the BEMMA method of Dahl and Newton (2005).
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