[BioC] Accessing SD values from CEL files

[James W. MacDonald]

Hi Hans,

Hans van Leeuwen wrote:
>  
> Hi,
> 
> I want to extract both the signal intensity and the corresponding SD values
> from Affymetrix CEL files. I read in the affy BioC 1.8 release notes that
> ReadAffy can now optionally return the SD values stored in the CEL file.
> 
> When I use ReadAffy I add the parameter sd = TRUE, but I am trying to figure
> out how I can get these value from the object. Is there a function,
> equivalent to the intensities() function, to retrieve the SD values?

Yes. The function se.exprs() will do this. See ?AffyBatch-class for more 
information.

Best,

Jim


> 
> Thanks,
> 
> Hans van Leeuwen
> 
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-- 
James W. MacDonald, M.S.
Biostatistician
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
734-647-5623


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