search for: lqol

Hi, I am currently analysising a counting process form of a cox model allowing for the inclusion of time dependent covariates. An example model I have fitted is modlqol<-coxph(Surv(Tstart,Tstop,cens.time)~tmt.first+risk +lqol+cluster(id),data=cat) summary(modlqol) My question is quick. I am looking at 1 event (death), and repeated measurements (the time dependent covariate 'lqol') are frequently taken on a subject, so I assume that measurements on the...

Zoe writes: My question is quick. I am looking at 1 event (death), and repeated measurements (the time dependent covariate 'lqol') are frequently taken on a subject, so I assume that measurements on the same subject will be correlated. The answer is: no, it's not a problem When the time intervals for a subject are disjoint, e.g, 0-10, 10-49, 49-127, etc, like they will be on this data, the mulitple lines are just...