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cph
2009 Feb 18
1
Age as time-scale in a cox model-How to calculate x-time risk?
...ata=stanford2, surv=T)
#In this case the 1000-day survival probability would be:
stanf.surv1=survest(stanf.cph1, times=1000)
#Age in this case is a covariate.
#I now want to compare the above estimate to the 1000-day survival probability I get using age at entry and exit as my time-scale:
stanf.cph2=cph(Surv(age,age+time, status) ~ t5+id, data=stanford2, surv=T)
stanf.surv2=survest(stanf.cph2, times=1000)
summary(stanf.surv1$surv)
Min. 1st Qu. Median Mean 3rd Qu. Max. NA's
0.1131 0.3370 0.4669 0.4538 0.5633 0.7480 27.0000
> summary(stanf.surv2$surv)
Min. 1st Q...