[R] Repost - Possible bug with lrm.fit in Design Library

[Marc Schwartz]

On Aug 21, 2009, at 11:02 AM, Noah Silverman wrote:

> Hi,
>
> I've come across a strange error when using the lrm.fit function and  
> the subsequent predict function.
>
> The model is created very quickly and can be verified by printing it  
> on the console.  Everything looks good. (In fact, the performance  
> measures are rather nice.)
>
> Then, I want to use the model to predict some values.  I get the  
> following error: "fit was not created by a Design library fitting  
> function"
>
> This is the exact same data and process I'm using with the lrm  
> function.  I thought I'd try lrm.fit to see if the results where  
> better.
>
> Since the model WAS created by a function of the Design library, I  
> can't see how it would then be rejected.
>
> Below is the session transcript:

<snip>

Noah, you seem to have missed Frank's reply to your original post  
about 3 hours ago:

   https://stat.ethz.ch/pipermail/r-help/2009-August/208940.html

HTH,

Marc Schwartz