I'm reading "Bioinformatics and Computational Biology Solutions Using R and Bioconductor".
  I imported my 12 CEL data files using > samples <- ReadAffy()
  I wanted use  affycompPlot (pag.31) to create an MA plot with the expected log fold change but i didn't understand how, because  they use (pag. 30) a phenodata included in affycomp package.
  Can you help me?
Thanks
   

		
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