Hi,

I am running a simulation study with the survival::coxph.  Some of the 
simulations result in problematic fits due to flat partial likelihood. So, you 
get the warning message:

Warning message:
In fitter(X, Y, strats, offset, init, control, weights = weights,  ... :
  Loglik converged before variable  2 ; beta may be infinite. 

How can I keep track of the simulations which yield any kind of warning 
message, so that I can appropriately handle them in the post-processing of 
simulation results?

I know that `try' can be used to capture errors, but I would like to capture 
and detect warnings.

Any pointers would be appreciated.

Thanks,
Ravi.
____________________________________________________________________

Ravi Varadhan, Ph.D.
Assistant Professor,
Division of Geriatric Medicine and Gerontology
School of Medicine
Johns Hopkins University

Ph. (410) 502-2619
email: rvarad...@jhmi.edu

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