Hello everybody, I would like to calculate the median for each factor combination, with only one value per factor combination as an output. Could anybody help me?
For example: # make table g<-1:2 group<-rep(g, each=5) session<-c(1,1,2,2,2,1,1,1,2,2) rt<-seq(length=10,300, 800) rt<-round(rt, digits=2) table<-data.frame(group, session, rt) table group session rt 1 1 1 300.00 2 1 1 355.56 3 1 2 411.11 4 1 2 466.67 5 1 2 522.22 6 2 1 577.78 7 2 1 633.33 8 2 1 688.89 9 2 2 744.44 10 2 2 800.00 Besides others I tried the following: median<-ave(rt, group, session, FUN=median) median<-frameApply(table,by=c("group", "session"), on="rt", fun=median) I would appreciate your help a lot. Marianne [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org 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.