Dear Bioconductor subcribers: 

First of all, I apologize for using a old-resolved bioconductor´s thread:https://stat.ethz.ch/pipermail/bioconductor/2011-June/039993.html 

" Dear list, > > I am quite new to R as well as to microarray analysis. > I am dealing with some gene expression analysis performed on Affymetrix Human > Gene 1.0ST microarray. > > So far, I have learnt how to filtrate data using genefilter using nsFilter > functions. > > Now, I would like to know how to filter out from the expressionset object all > the control probesets (~4000) that Affymetrix includes in the microarray (for > quality assay, normalization, background correction, etc.). However, none of > the aforementioned functions worked for me. > > How can I recognize those probesets and remove them? I would like to filter > them out before statistical analysis with limma package." 

I have been having the same problem when using oligo to analyze the data. It so happens that when I try to filter control probe IDs with nsfilter it doesn´t work properly. Do you know anyway to get around this problem? 

Many thanks in advance 

Juan 

--------------------------------------------------------------- 
Juan Fernandez Tajes, ph. D 
Grupo XENOMAR 
Departamento de Biología Celular y Molecular 
Facultad de Ciencias-Universidade da Coruña 
Tlf. +34 981 167000 ext 2030 
e-mail: jfernandezt@udc.es 
---------------------------------------------------------------- 



	[[alternative HTML version deleted]]

