Stochastic models inspired by hybridization theory for short oligonucleotide arrays
RECOMB '04 Proceedings of the eighth annual international conference on Resaerch in computational molecular biology
A Learned Comparative Expression Measure for Affymetrix GeneChip DNA Microarrays
CSB '05 Proceedings of the 2005 IEEE Computational Systems Bioinformatics Conference
Automatic quality assessment of Affymetrix GeneChip data
Proceedings of the 44th annual Southeast regional conference
Reproducibility-Optimized Test Statistic for Ranking Genes in Microarray Studies
IEEE/ACM Transactions on Computational Biology and Bioinformatics (TCBB)
International Journal of Data Mining and Bioinformatics
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Motivation: The defining feature of oligonucleotide expression arrays is the use of several probes to assay each targeted transcript. This is a bonanza for the statistical geneticist, who can create probeset summaries with specific characteristics. There are now several methods available for summarizing probe level data from the popular Affymetrix GeneChips, but it is difficult to identify the best method for a given inquiry. Results: We have developed a graphical tool to evaluate summaries of Affymetrix probe level data. Plots and summary statistics offer a picture of how an expression measure performs in several important areas. This picture facilitates the comparison of competing expression measures and the selection of methods suitable for a specific investigation. The key is a benchmark data set consisting of a dilution study and a spike-in study. Because the truth is known for these data, we can identify statistical features of the data for which the expected outcome is known in advance. Those features highlighted in our suite of graphs are justified by questions of biological interest and motivated by the presence of appropriate data. Availability: In conjunction with the release of a graphics toolbox as part of the Bioconductor project (http://www.bioconductor.org), a webtool is available at http://affycomp.biostat.jhsph.edu. Supplemental material is available at http://www.biostat.jhsph.edu/~ririzarr/papers/suppaffycomp.pdf