Hi bioconductor mailing list,
I got a (another) problem with redundant probesets from Affymetrix chips:
For my downstream analysis to work, I need only 1 expression value per gene
(eg Entrez Id).
So by now I have a table that looks something like this:

 N probe set gene id expression  1 *12345_at* *123* 1.5  2 123456_at 1234 2
3 *1234567_at* *123* 1.6  4 12345678_at 12345 4  5 *123456789_at* *123* 1.4
By collapsing I mean as a result something like this:

 N probe set gene id expression
 1 *12345_at* *123* *1.5* <= eg median  2 123456_at 1234 2
 4 12345678_at 12345 4

I hope one can help me out! I have seen this in several publications, so
there must be a way.

Thanks in advance, Andreas Heider

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