Using data from a multicenter study with a parallel-group design comparing two treatments, I plotted each subject's time change of X after stratifying for center:
xyplot(X ~ time | center, type="l", panel=panel.superpose, groups=subject)
Now I want these lines to take different colours according to the variable "treatment". Any help? Umberto
_________________________________________________________________ Filtri antispamming e antivirus per la tua casella di posta
______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
