Dear Lists:

I was running affy package to analysis my data as following:

eset <- expresso (abexample, normalize.method="quantiles",
                  bg.correct = F, pmcorrect.method=NULL,
                  summary.method="medianpolish")

I got following error message:

normalization: quantiles 
PM/MM correction : 
expression values: medianpolish 
normalizing...done.
Error in computeExprSet(afbatch, summary.method = summary.method, pmcorrect.method = pmcorrect.method,  : 
        no direct or inherited method for function 'computeExprSet' for this call

What happened here? How to solve it? 

Thank you.

Yihuan





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