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Departments of Statistics and Human Genetics, University of
California, Los Angeles, CA 90095
Edited by Peter J. Bickel, University of California, Berkeley,
CA, and approved October 30, 2000 (received for review August 21, 2000)
Recent advances in cDNA and oligonucleotide DNA arrays have made it
possible to measure the abundance of mRNA transcripts for many genes
simultaneously. The analysis of such experiments is nontrivial because
of large data size and many levels of variation introduced at different
stages of the experiments. The analysis is further complicated by the
large differences that may exist among different probes used to
interrogate the same gene. However, an attractive feature of
high-density oligonucleotide arrays such as those produced by
photolithography and inkjet technology is the standardization of chip
manufacturing and hybridization process. As a result, probe-specific
biases, although significant, are highly reproducible and predictable,
and their adverse effect can be reduced by proper modeling and analysis
methods. Here, we propose a statistical model for the probe-level data,
and develop model-based estimates for gene expression indexes. We also
present model-based methods for identifying and handling
cross-hybridizing probes and contaminating array regions. Applications
of these results will be presented elsewhere.
Statistics
Model-based analysis of oligonucleotide arrays: Expression index
computation and outlier detection
*
To whom reprint requests should be addressed at: Department of
Biostatistics, Harvard University, 655 Huntington Avenue, Boston, MA
02115. E-mail: wwong{at}hsph.harvard.edu.
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