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Old 05-07-2012, 12:21 AM   #2
Gordon Smyth
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Location: Melbourne, Australia

Join Date: Apr 2011
Posts: 91
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Dear polsum,

The edgeR User's Guide contains five case studies, and all are normalized exactly the same way, except for the second which deals with deepSAGE data for which simple library size normalization was considered sufficient.

You are mis-understanding the role of cpm, which are used only as descriptive quantities for data exploration in edgeR, not as part of the formal normalization or differential expression process.

We obviously recommend, unless there are good reasons otherwise, that you use calcNormFactors() for an RNA-Seq analysis.

Note that edgeR is a Bioconductor package, so the way to get a prompt answer is to post your question to the Bioconductor mailing list. See the section "how to get help" in the edgeR User's Guide.

It also seems that your version of edgeR must be very old. Could I suggest that you update?

Gordon
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