Re: [R] Time-dependent covariates in survreg function

2010-07-28 Thread Dimitris Rizopoulos
Dear Michael, AFAIK survreg() cannot handle time-dependent covariates. In particular, things are getting more complicated under the accelerated failure time framework when it comes to the handling of time-dependent covariates. Moreover, it is important (for both Cox and AFT models) to determi

[R] Time-dependent covariates in survreg function

2010-07-28 Thread Michael Haenlein
Dear all, I'm asking this question again as I didn't get a reply last time: I'm doing a survival analysis with time-dependent covariates. Until now, I have used a simple Cox model for this, specifically the coxph function from the survival library. Now, I would like to try out an accelerated fail