[R] Number of variables in lrm (Design)

[Frank E Harrell Jr]

Paul Sweeting wrote:
> Hi
> 
>  
> 
> I'm sure this is straightforward, but I can't find an answer.
> 
>  
> 
> I'm trying to find the function that returns the number of dependent
> variables/rank of the regression/degrees of freedom/something similar.  Any
> ideas?
> 
>  
> 
> Thanks!
> 
>  
> 
> Paul

Design does not allow for singularities.  To get the regression d.f. you 
can use length(coef(fit))-num.intercepts(fit) or just fit$stats['d.f.']

Frank

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