On page 9 of the "Textual description of affy" Jan 7, 2003, the expresso example gives errors. peter3.qspline <- expresso(peter3,normalize.method="qspline", bg.method="rma", summary.method="liwong") Error in expresso(peter3, normalize.method = "qspline", bg.method = "rma", : unused argument(s) (bg.method ...) Probably this should be bgcorrect.method. Also, if the argument pmcorrect.method is omitted, an error occurs. ********************************************************************** ********* Richard P. Beyer, Ph.D. University of Washington Tel.:(206) 616 7378 Environmental Health, Box 354695 Fax: (206) 685 4696 4225 Roosevelt Way NE, # 100 Seattle, WA 98105-6099 ********************************************************************** *********