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31026
2008 Jan 08
1
Problem in anova with coxph object
Dear R users,
I noticed a problem in the anova command when applied on
a single coxph object if there are missing observations in
the data:
This example code was run on R-2.6.1:
> library(survival)
> data(colon)
> colondeath = colon[colon$etype==2, ]
> m = coxph(Surv(time, status) ~ rx + sex + age + perfor, data=colondeath)
> m
Call:
coxph(formula = Surv(time, status) ~ rx +