[R] Problem with calibrate function

Frank E Harrell Jr f.harrell at vanderbilt.edu
Fri Dec 11 17:25:17 CET 2009


Rodrigo wrote:
> Hi,
> 
> I´m trying to use the calibrate function from rms package (made by prof.
> Harrell) after fitting a model using cph. But it returns the following error
> message:
> 
>> calibrate(modelo1,B=200,bw=F,u=13)
> 
> Using Cox survival estimates at  13 Days
> Convergence problems.... stopping addition
> Error in hare(S[, 1], S[, 2], fun(est.surv), maxdim = maxdim, ...) :
>  no convergence
>  this is serious!
> 
> Has anybody experienced the same problem? Can anyone help me?
> 
> many thanks,
> Rodrigo


Rodrigo,

This is a new feature in rms and there are probably a few warnings I 
need to put in the help file.  How many events are in the dataset used 
to develop your model?  Why did you specify bw=FALSE (which is the 
default)?  Did you use any variable selection when building the model?

Frank

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University



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