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On Feb 1, 2008 6:14 AM, Clairac <clairac at="" crh1.org=""> wrote: > Hi, > > J use ArraysTools v3.6.0 on Excel 2007 and J can collate .CEL files correctly with RMA method but not with GCRMA and MAS 5.0 methods. Hi, Geraldine. You will need to contact the BRB ArrayTools authors for help with BRB ArrayTools, and I would encourage you to do so. As for installing Bioconductor packages, you will want to see the webpage here: http://bioconductor.org/docs/download If you still have problems using Bioconductor after following the instructions there, feel free to write back with details about what you did to install R and Bioconductor, what commands are not working and what errors you get. Be sure to include the output of sessionInfo(). Hope that helps, Sean