Re: [R] survival::predict.coxph

2009-02-27 Thread Bernhard Reinhardt
Hello Therry, it´s really great to receive some feedback from a pro. I´m not sure if I´ve got the point right: You suppose that the cox-model isn´t good at forecasting an expected survival time because of the issues with the prediction of the survival-function at the right tail and one should

[R] survival::predict.coxph

2009-02-26 Thread Bernhard Reinhardt
Hi, I just came across another question concerning predict.coxph Terry Therneau states in A Package for Survival Analysis in S that term - predict(fit, type=terms) yields predicted values for the individual components of the linear predictor X*beta My coxmodel looks like: coef

Re: [R] survival::predict.coxph

2009-02-26 Thread Terry Therneau
You are mostly correct. Because of the censoring issue, there is no good estimate of the mean survival time. The survival curve either does not go to zero, or gets very noisy near the right hand tail (large standard error); a smooth parametric estimate is what is really needed to deal with

[R] survival::predict.coxph

2009-02-25 Thread Bernhard Reinhardt
Hi, if I got it right then the survival-time we expect for a subject is the integral over the specific survival-function of the subject from 0 to t_max. If I have a trained cox-model and want to make a prediction of the survival-time for a new subject I could use survfit(coxmodel,