[BioC] standard errors for expression intensities

James W. MacDonald jmacdon at med.umich.edu
Thu Aug 18 20:46:02 CEST 2005

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.



> Thanks,
> Karthik.
> 	[[alternative HTML version deleted]]
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James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109

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