On Thu, 24 Jul 2008, Christoph Scherber wrote:
Dear Jon,
The function stepAIC() in Venable´s & Ripley´s MASS library does the job.
Actually, it is extractAIC method in the MASS package that does the job
for stepAIC() or step(), so if you attach MASS then step() should work.
As for 'all.effects': that is not part of R: looks like no one mentioned
the 'effects' package where a function of that name resides. You can
discuss this with the maintainer (John Fox), but it does not look trivial
to modify it to work with lme fits.
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
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