A mixture model approach to sample size estimation in two-sample comparative microarray experiments
<p>Abstract</p> <p>Background</p> <p>Choosing the appropriate sample size is an important step in the design of a microarray experiment, and recently methods have been proposed that estimate sample sizes for control of the False Discovery Rate (FDR). Many of these metho...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMC
2008-02-01
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| Series: | BMC Bioinformatics |
| Online Access: | http://www.biomedcentral.com/1471-2105/9/117 |
| _version_ | 1811295928081973248 |
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| author | Bones Atle M Midelfart Herman Jørstad Tommy S |
| author_facet | Bones Atle M Midelfart Herman Jørstad Tommy S |
| author_sort | Bones Atle M |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>Choosing the appropriate sample size is an important step in the design of a microarray experiment, and recently methods have been proposed that estimate sample sizes for control of the False Discovery Rate (FDR). Many of these methods require knowledge of the distribution of effect sizes among the differentially expressed genes. If this distribution can be determined then accurate sample size requirements can be calculated.</p> <p>Results</p> <p>We present a mixture model approach to estimating the distribution of effect sizes in data from two-sample comparative studies. Specifically, we present a novel, closed form, algorithm for estimating the noncentrality parameters in the test statistic distributions of differentially expressed genes. We then show how our model can be used to estimate sample sizes that control the FDR together with other statistical measures like average power or the false nondiscovery rate. Method performance is evaluated through a comparison with existing methods for sample size estimation, and is found to be very good.</p> <p>Conclusion</p> <p>A novel method for estimating the appropriate sample size for a two-sample comparative microarray study is presented. The method is shown to perform very well when compared to existing methods.</p> |
| first_indexed | 2024-04-13T05:39:56Z |
| format | Article |
| id | doaj.art-f4178aca4b7844b09ab43401f118d992 |
| institution | Directory Open Access Journal |
| issn | 1471-2105 |
| language | English |
| last_indexed | 2024-04-13T05:39:56Z |
| publishDate | 2008-02-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Bioinformatics |
| spelling | doaj.art-f4178aca4b7844b09ab43401f118d9922022-12-22T03:00:08ZengBMCBMC Bioinformatics1471-21052008-02-019111710.1186/1471-2105-9-117A mixture model approach to sample size estimation in two-sample comparative microarray experimentsBones Atle MMidelfart HermanJørstad Tommy S<p>Abstract</p> <p>Background</p> <p>Choosing the appropriate sample size is an important step in the design of a microarray experiment, and recently methods have been proposed that estimate sample sizes for control of the False Discovery Rate (FDR). Many of these methods require knowledge of the distribution of effect sizes among the differentially expressed genes. If this distribution can be determined then accurate sample size requirements can be calculated.</p> <p>Results</p> <p>We present a mixture model approach to estimating the distribution of effect sizes in data from two-sample comparative studies. Specifically, we present a novel, closed form, algorithm for estimating the noncentrality parameters in the test statistic distributions of differentially expressed genes. We then show how our model can be used to estimate sample sizes that control the FDR together with other statistical measures like average power or the false nondiscovery rate. Method performance is evaluated through a comparison with existing methods for sample size estimation, and is found to be very good.</p> <p>Conclusion</p> <p>A novel method for estimating the appropriate sample size for a two-sample comparative microarray study is presented. The method is shown to perform very well when compared to existing methods.</p>http://www.biomedcentral.com/1471-2105/9/117 |
| spellingShingle | Bones Atle M Midelfart Herman Jørstad Tommy S A mixture model approach to sample size estimation in two-sample comparative microarray experiments BMC Bioinformatics |
| title | A mixture model approach to sample size estimation in two-sample comparative microarray experiments |
| title_full | A mixture model approach to sample size estimation in two-sample comparative microarray experiments |
| title_fullStr | A mixture model approach to sample size estimation in two-sample comparative microarray experiments |
| title_full_unstemmed | A mixture model approach to sample size estimation in two-sample comparative microarray experiments |
| title_short | A mixture model approach to sample size estimation in two-sample comparative microarray experiments |
| title_sort | mixture model approach to sample size estimation in two sample comparative microarray experiments |
| url | http://www.biomedcentral.com/1471-2105/9/117 |
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