[BioC] RMA median polish to a matrix

Naira Naouar nanao at psb.ugent.be
Thu Jan 24 16:16:28 CET 2008

Hi all,

I just discovered the medianpolish function which does exactly what I need 


On Thu, 24 Jan 2008, Naira Naouar wrote:

> Dear all,
> I have a matrix of intensities for one gene: PxA where P represents the
> number of probes and A the number of arrays; and I would like to summarize
> the probe intensities values in order to get 1 value/ array for this gene
> using the median polish algorithm.
> The medpolish fonction in R provides me the overall median and the
> residuals terms relative to the additive model behind the median polish
> but I am not quite sure on how to add this values to get the correct
> expression value for the gene for each array.
> Thanks a lot for your help,
> Naira
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