[BioC] standard errors for expression intensities

[James W. MacDonald]

Devarajan, Karthik wrote:
> Hello!
> 
> When I use the functions rma() or justrma() in the affy package, the
> standard errors for the expression estimates computed by the function
> se.exprs() is a matrix of NA's. I am wondering if any of you have
> encountered this problem and if there is a solution. Any help would be
> appreciated.

You need to use the affyPLM package. Specifically, see ?rmaPLM and the 
quality assessment vignette.

Best,

Jim


> 
> Thanks,
> Karthik.
> 
> 
> 
> 
> 
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> 
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-- 
James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
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