[R] changes in coxph in "survival" from older version?

[Frank Harrell]

It's worse if the model does converge because then you don't have a warning
about the result being nonsense.
Frank


Terry Therneau-2 wrote:
> 
> -- begin included message ---
> I did realize that there are way more predictors in the model.  My
> initial thinking was use that as an initial model for stepwise model
> selection.  Now I  wonder if the model selection result is still valid
> if the initial model didn't even converge?
> --- end inclusion ---
> 
> You have 17 predictors with only 22 events.  All methods of "variable
> selection" in such a scenario will give essentially random results.
> There is simply not enough information present to determine a best
> predictor or best subset of predictors.  
> 
> Terry Therneau
> 
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> 


-----
Frank Harrell
Department of Biostatistics, Vanderbilt University
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