[BioC] How can I remove control probesets from the expressionset object in gene expression analysis with Affy Human Gene 1.0ST microarray
virginia.garcia at ifi.csic.es
Tue Jun 21 12:46:16 CEST 2011
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
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.
Thank you very much in advance for your help.
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