there are totally 8 methods [1] "constant" "contrasts" "invariantset" "loess" [5] "methods" "qspline" "quantiles" "quantiles.robust" do you know which are to normalize within arrays, which are to normalize data between arrays. -- shan gao Room 231(Dr.Fei lab) Boyce Thompson Institute for Plant Research Cornell University Tower Road, Ithaca, NY 14853-1801 Office phone: 1-607-254-1267(day) Official email:sg839@cornell.edu Facebook:http://www.facebook.com/profile.php?id=100001986532253 [[alternative HTML version deleted]]