Hi, I wonder if you could use the R-function calcMeanSD for more than duplicates. I've tried to change the code but still the function only count for duplicates. Do it exist some other function that calculate the same but for sevral replicates? H/Monica **************************************************************************** Mailing list for KTH-package. For more information see: www.biotech.kth.se/molbio/microarray To change the settings or unsubscribe: //www.freelists.org/cgi-bin/list?list_id=kth-package To send mail to the list use: kth-package@xxxxxxxxxxxxx To get information on how the mailing list works, send an empty e-mail with the word 'faq' to kth-package-request@xxxxxxxxxxxxx ***************************************************************************