Re: [R] anova.coxph with subsets of data

2014-01-29 Thread Oscar Rueda
Ka Shing Centre, Robinson Way. Cambridge CB2 0RE England From: Therneau, Terry M., Ph.D. [thern...@mayo.edu] Sent: Wednesday, January 29, 2014 2:35 PM To: Oscar Rueda; r-help@r-project.org Subject: Re: [R] anova.coxph with subsets of data --- begin

Re: [R] anova.coxph with subsets of data

2014-01-29 Thread Therneau, Terry M., Ph.D.
--- begin included message --- But If I do fit <- coxph(Surv(futime, fustat) ~ resid.ds *rx + ecog.ps, data = ovarian, subset=ovarian$age>50) anova(fit) fit2 <- coxph(Surv(futime, fustat) ~ resid.ds +rx + ecog.ps, data=ovarian, subset=ovarian$age>50) anova(fit2,fit) The first p-value s

Re: [R] anova.coxph with subsets of data

2014-01-29 Thread Oscar Rueda
cs. University of Cambridge. Cancer Research UK Cambridge Institute. Li Ka Shing Centre, Robinson Way. Cambridge CB2 0RE England From: David Winsemius [dwinsem...@comcast.net] Sent: Wednesday, January 29, 2014 12:10 AM To: Oscar Rueda Cc: r-help@r-proj

Re: [R] anova.coxph with subsets of data

2014-01-28 Thread David Winsemius
On Jan 28, 2014, at 10:32 AM, Oscar Rueda wrote: > Dear list, > I'm using the rms package to fit some Cox models. I run anova() on them to > obtain sequential p-values, but I'm getting strange results when I run it on > a subset of the data. > > Following the example on the help page of anov

[R] anova.coxph with subsets of data

2014-01-28 Thread Oscar Rueda
Dear list, I'm using the rms package to fit some Cox models. I run anova() on them to obtain sequential p-values, but I'm getting strange results when I run it on a subset of the data. Following the example on the help page of anova.coxph: > library(rms) > data(ovarian) > fit <- coxph(Surv(fut