[BioC] Bioconductor

[Robert Cribbie]

I am a "newcomer" to the field of microarray analysis and I have run into
a snag trying to analyze some cdna data.

To determine if the same gene in two different groups is differentially
expressed I assume that I am comparing the expression levels of the two
groups after normalization. However, when I use bioconductor to normalize
the data (e.g., maNorm) I only end up with matrices of log ratios
(maM). How do I compare the expression levels of the two groups if I only
have the log ratios (and not the normalized expression levels).

Thanks for any help that you can provide.

Rob.

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                      Robert A. Cribbie

Assistant Professor		  Associate Coordinator
Department of Psychology	  Statistical Consulting Service
York University                   Institute for Social Research
Toronto, Ontario, Canada          York University
M3J 1P3

Phone: 416-736-5115 (x88615)      E-Mail: cribbie at yorku.ca
Fax: 416-736-5814                 Website: http://www.psych.yorku.ca/cribbie