My question is related to a cox model with time-dependent variable. When I think about it more, I get a little confused about non-increasing assumption for survival probability for an individual. For example, for a time-dependent ,say x, assuming increasing x increases the risk of event. Assume,time t1 < t2. If at x at t1<< x at t2, obviously, hazard at t1 will less than hazard at t2, assuming no other covariaates. But is it possible that s(t2|x at t2) > s(t1|x at t1), since at t2, an individual is at greater risk. This is kind of confusing to me.
Thanks for any helpful insights! Zhiyuan ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
