[BioC] Error: expresso

James MacDonald jmacdon at med.umich.edu
Thu Jul 1 17:28:07 CEST 2004

That error most likely indicates that abcel.data is not an AffyBatch.
Did you use ReadAffy() to create abcel.data?



James W. MacDonald
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109

>>> S Peri <biocperi at yahoo.com> 07/01/04 08:25AM >>>
Hello group, 

 I am trying to normalize using expresso module and I
am getting the following error. In fact I followed the
example given at the bottom of help file.  The
following is what I get: 
> abcel.data.norm = expresso(abcel.data,
bgcorrect.method = "rma", normalize.method =
"constant", pmcorrect.method = "pmonly",
summary.method = "avgdiff")
background correction: rma 
normalization: constant 
PM/MM correction : pmonly 
expression values: avgdiff 
background correcting...Error in bg.correct(afbatch,
method = bgcorrect.method) : 
        No direct or inherited method for function
"bg.correct" for this call

Any suggestions where it is going wrong. 
Thank you. 


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