[R] Logistic regression goodness of fit tests

[Trevor Wiens]

On Thu, 10 Mar 2005 16:19:41 -0600
Frank E Harrell Jr <f.harrell at vanderbilt.edu> wrote:

> The goodness of fit test only works on prespecified models.  It is not 
> valid when stepwise variable selection is used (unless perhaps you use 
> alpha=0.5).
> 

Perhaps I'm blind, but I can't find any reference to an alpha parameter on the help page for stepAIC. It runs fine however when I set the parameter and produces as model with the same right hand variables as without. Can you tell me what it is ?

T
-- 
Trevor Wiens 
twiens at interbaun.com

The significant problems that we face cannot be solved at the same 
level of thinking we were at when we created them. 
(Albert Einstein)