Dear anonymous, The avereps() function the limma package does exactly this. Best wishes Gordon > Date: Thu, 01 Apr 2010 15:41:52 +0800 (CST) > From: "697820169" <697820169 at mail.ndmctsgh.edu.tw> > To: bioconductor at stat.math.ethz.ch > Subject: [BioC] Get gene expression data by averaging probes > corresponding to the gene? > > I am trying to do a pooled microarray analyze with arrays > of different platform. In order to have a comparable data, > I have come to the idea to convert the probes in each array > to corresponding gene symbols, and use these gene expression > data instead of probe expression as the data to analyze. > > I've tried to find a function of averaging probes to > corresponding genes, but found nothing that meet my need. > I have done a few google searches like "bioc average probe > intensity to gene", "bioconductor average probe to gene", > etc... and came up with no usable information. > > If anyone can give me a hint where I can find the function I > need, I will very much appreciate. ______________________________________________________________________ The information in this email is confidential and intend...{{dropped:4}}