Re: [R] Compare mean survival time

2008-02-20 Thread Terry Therneau
Xing Yuan wrote: > Dear List, > > Does anybody no how to compare mean survival times for two (more) groups in > R? What test statistics should I use? Because of censoring, you can only compare the conditional means. That is, given a pre-defined cutpoint such as "2 years", you estimate the ex

Re: [R] Compare mean survival time

2008-02-20 Thread Corey Sparks
Xing Yuan wrote: > Dear List, > > Does anybody no how to compare mean survival times for two (more) groups in > R? What test statistics should I use? You should be careful considering the mean survival time, because censoring in survival data often makes the mean less informative. The median sur

Re: [R] Compare mean survival time

2008-02-19 Thread Roland Rau
Hi, Xing Yuan wrote: > Dear List, > > Does anybody no how to compare mean survival times for two (more) groups in > R? What test statistics should I use? my answer is less of an R answer than a literature answer: John P. Klein and Melvin L. Moeschberger devote section 4.5 in their book "Surviv

Re: [R] Compare mean survival time

2008-02-18 Thread Ben Bolker
Xing Yuan gmail.com> writes: > > Dear List, > > Does anybody no how to compare mean survival times for two (more) groups in > R? What test statistics should I use? > > Thank you very much! > > Joe The question is probably a little bit too vague. You should certainly look at the survival p

[R] Compare mean survival time

2008-02-18 Thread Xing Yuan
Dear List, Does anybody no how to compare mean survival times for two (more) groups in R? What test statistics should I use? Thank you very much! Joe [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.