Try this I used today
aggregate(data, by=list(factor.name=data$FACTOR.NAME), sum) Norm Good CMIS/e-Health Research Centre A joint venture between CSIRO and the Queensland Government Lvl 20, 300 Adelaide Street BRISBANE QLD 4000 PO Box 10842 Adelaide Street BRISBANE QLD 4000 Ph: 07 3024 1640 Fx: 07 3024 1690 Em: [EMAIL PROTECTED] Web: http://e-hrc.net/ [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
