I am using aroma.affymetrix for pre-processing of data for CNV analysis.  
Briefly, I normalize and estimate copy number with CRMAv2.  I use the 
calculated copy number along with the chromosomal locations from the ugp 
file to run CBS using segment from the DNAcopy package.  Then I analyze the 
segmented copy number calls with downstream software like RAE from MSKCC.  

I am analyzing data collected on the GWS6 platform.  I am getting errors 
when multiple probes map to the same genomic location.  For example, probe 
SNP_A-8462292 and probe CN_1173216 both map to chromosome 6 locus 
29837188.  Is this behavior expected?  Is there a work around for this 
issue?  

Thanks, 
Mike 

-- 
When reporting problems on aroma.affymetrix, make sure 1) to run the latest 
version of the package, 2) to report the output of sessionInfo() and 
traceback(), and 3) to post a complete code example.


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