R help - Jul 2008 - Functions similar to step() and all.effects() that work for lme() objects?

Hello,

I make frequent use of the *step()* and, for plotting, *all.effects() 
*functions for *lm()* objects.  I am now doing more with *lme()* random 
effects models, and haven't been able to find functions similar to 
*step()* or *all.effects()* which will accept *lme()* objects.  Do 
similar functions for either exist?  If someone could point me in the 
right direction it would be much appreciated.

Thanks!

Jon
-- 
Jon Zadra
Department of Psychology
University of Virginia
P.O. Box 400400
Charlottesville VA 22904
(434) 982-4744
email: zadra at virginia.edu
<http://www.google.com/calendar/embed?src=jzadra%40gmail.com>

Dear Jon,

The function stepAIC() in Venable?s & Ripley?s MASS library does the job.

Best wishes
Christoph



Jon Zadra schrieb:
> Hello,
> 
> I make frequent use of the *step()* and, for plotting, *all.effects() 
> *functions for *lm()* objects.  I am now doing more with *lme()* random 
> effects models, and haven't been able to find functions similar to 
> *step()* or *all.effects()* which will accept *lme()* objects.  Do 
> similar functions for either exist?  If someone could point me in the 
> right direction it would be much appreciated.
> 
> Thanks!
> 
> Jon