Journal article
Bayesian optimal discovery procedure for simultaneous significance testing
BMC bioinformatics, Vol.10(1), 5
01/06/2009
DOI: 10.1186/1471-2105-10-5
PMCID: PMC2628883
PMID: 19126217
Abstract
In high throughput screening, such as differential gene expression screening, drug sensitivity screening, and genome-wide RNAi screening, tens of thousands of tests need to be conducted simultaneously. However, the number of replicate measurements per test is extremely small, rarely exceeding 3. Several current approaches demonstrate that test statistics with shrinking variance estimates have more power over the traditional t statistic. We propose a Bayesian hierarchical model to incorporate the shrinkage concept by introducing a mixture structure on variance components. The estimates from the Bayesian model are utilized in the optimal discovery procedure (ODP) proposed by Storey in 2007, which was shown to have optimal performance in multiple significance tests. We compared the performance of the Bayesian ODP with several competing test statistics. We have conducted simulation studies with 2 to 6 replicates per gene. We have also included test results from two real datasets. The Bayesian ODP outperforms the other methods in our study, including the original ODP. The advantage of the Bayesian ODP becomes more significant when there are few replicates per test. The improvement over the original ODP is based on the fact that Bayesian model borrows strength across genes in estimating unknown parameters. The proposed approach is efficient in computation due to the conjugate structure of the Bayesian model. The R code (see Additional file 1) to calculate the Bayesian ODP is provided.
Details
- Title: Subtitle
- Bayesian optimal discovery procedure for simultaneous significance testing
- Creators
- Jing Cao - Department of Statistical Science, Southern Methodist University, Dallas, Texas, USA. jcao@smu.eduXian-Jin XieSong ZhangAngelique WhitehurstMichael A White - The University of Texas Southwestern Medical Center
- Resource Type
- Journal article
- Publication Details
- BMC bioinformatics, Vol.10(1), 5
- DOI
- 10.1186/1471-2105-10-5
- PMID
- 19126217
- PMCID
- PMC2628883
- NLM abbreviation
- BMC Bioinformatics
- ISSN
- 1471-2105
- eISSN
- 1471-2105
- Publisher
- England
- Grant note
- R01 CA071443-14 / NCI NIH HHS UL1 RR024982 / NCRR NIH HHS UL1RR024982 / NCRR NIH HHS R01 CA071443 / NCI NIH HHS P50 CA070907 / NCI NIH HHS
- Language
- English
- Date published
- 01/06/2009
- Academic Unit
- Preventive and Community Dentistry; Biostatistics; Dental Research
- Record Identifier
- 9983917674102771
Metrics
26 Record Views