The survival function, S(t), gives you the probability of surviving beyond time
t starting from time 0. If you want to know the probability of surviving
beyond time t *given* that you survived to get a heart surgery at time u0,
that is a different function. It might be S(t)/S(u) depending on
Thanks Terry. Your explanation is right on the point. You solved my
question about time-dependent covariate. When calculating survival at
time t, you have to consider the exposure history before ant at time
t. It is reasonable when we assume cumulative hazard before time t
can be carried over to
On 03/20/2014 06:00 AM, r-help-requ...@r-project.org wrote:
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
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