DEAR R-girl: On Thu, Feb 23, 2012 at 8:12 AM, R-girl <jhovi...@gmail.com> wrote: > Hei, > > I have a one simple question which does not seem to be that simple as I > cannot find any solution/answer: > > Is it possible to compare multiple survival curves in R with > survdiff-function when there is interaction term involved in predictor > variables (and this interaction is significant)?
I have one simple answer. Get local statistical help. You do not understand the meaning of an interaction. -- Bert > > Example: > > survdiff(Surv(death,status)~treatment*gapsize) > > R is making "problems" with it ie.e. it does not want to perform the test. > And all the examples I have found so far, may involve multiple predictor > variables but in additive format (e.g. treatment+gapsize). > > If survdiff is not the way to go, are there any other solutions in order to > compare statistically the curves i.e. if they differ significantly from each > other? > > I would really appreciate if someone can answer! > > Cheers, Minna > > -- > View this message in context: > http://r.789695.n4.nabble.com/Survival-analysis-and-comparing-survival-curves-tp4414316p4414316.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.
