# [BioC] External expression data/ MAS5 Signal

**Isaac Neuhaus
**
isaac.neuhaus@bms.com

*Fri, 28 Jun 2002 09:56:09 -0400*

Affymetrix has fully described the MAS5.0 algorithm and they put it on the web.
Here is the url:
http://www.affymetrix.com/support/technical/whitepapers.affx
Go to the bottom of the page and look for:
Statistical Algorithms Description Document (pdf, 660 KB)
Isaac
"Rafael A. Irizarry" wrote:
>* > #1. how can I import the external expression value table to affy? If
*>* > possible, in which format?
*>* what do you mean by external expression value table? if its just a flat
*>* file you can use read.table (an R command)
*>*
*>* > #2. I saw AvgDiff, AvgDiff2, rma, and li.wong in express. Is it possible to
*>* > calculate the Signal value which is implemented to Microarray Suite version
*>* > 5 in affy?
*>* >
*>* as far as i know the algorithm isnt public yet so we can't incorporate it.
*>*
*>* > Thank you very much for the helps in advance.
*>* >
*>* > SW
*>* >
*>*
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