Displaying 1 result from an estimated 1 matches for "fitagefollowup".
2007 Feb 05
2
Two ways to deal with age in Cox model
...1,0),
age= c(0, 2,1,1,1,0,0),
riskfactor= c(0, 0,0,0,1,1,1))
fitagecovariate<-coxph( Surv(time, status) ~ age +riskfactor, test1)
fitagecovariate
Age included as part of follow-up time:
test2<-test1
test2$timeplusage<-test2$time+test2$age
fitagefollowup<-coxph( Surv(timeplusage, status) ~ riskfactor, test2)
fitagefollowup
I would appreciate any thoughts about the differences in the
interpretation of the two models.
One obvious difference is that in the first model (fitagecovariate) one
can make inferences about age and in the second one canno...