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xnonmaintained
2011 Apr 18
1
time dependent hazard ratios
...me intervals 0-5, 5-10,
10-20 and >=20, would the following calculate such HRs?
> coxph(Surv(start,time,status)~x*as.factor(i),data=aml3)
Call:
coxph(formula = Surv(start, time, status) ~ x * as.factor(i),
data = aml3)
coef exp(coef) se(coef) z p
xNonmaintained 19.2 2.10e+08 10461 0.00183 1
as.factor(i)1 NA NA 0 NA NA
as.factor(i)2 NA NA 0 NA NA
as.factor(i)3 NA NA 0 NA NA
xNonmaintained:as.factor(i)1 -18.3 1.17e-08...
2004 Nov 09
1
survSplit: further exploration and related topics
...3<-survSplit(aml,cut=c(5,10,50),end="time",start="start",event="st
> >> atus",episode="i",id="id")
> >
> >> coxph(Surv(time,status)~x,data=aml)
> >
> > coef exp(coef) se(coef) z p
> > xNonmaintained 0.916 2.5 0.512 1.79 0.074
> >
> > Likelihood ratio test=3.38 on 1 df, p=0.0658 n= 23
> >
> > #the same
> >> coxph(Surv(time,status)~x,data=aml3)
> >
> > coef exp(coef) se(coef) z p
> > xNonmaintained 0.916 2...