[R] Functions similar to step() and all.effects() that work for lme() objects?

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Jul 24 10:42:28 CEST 2008

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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Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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