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detect coxph ill fits #1090

@dchiu911

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@dchiu911

Is there a method to detect ill-fitted coxph models such as when these warnings appear

Warning message:
In coxph.fit(X, Y, istrat, offset, init, control, weights = weights,  :
  Loglik converged before variable  1 ; coefficient may be infinite. 

or is the only way to do this via a tryCatch() for warning() since the model object doesn't store this phenomenon? I noticed that is_converged() only has methods for mixed models.

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