[R] Changing predictor order in lm()
Prof Brian Ripley
ripley at stats.ox.ac.uk
Sun Feb 19 13:43:41 CET 2006
RSiteSearch("keep.order") gave me
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/14240.html
which has such an example, and points out another example is in
demo(glm.vr).
On Sun, 19 Feb 2006, Andrew Robinson wrote:
> Dear community,
>
> can anyone provide a snippet of code to force the lm() to fit a model with
> terms in the formula in an arbitrary order? I am interested in something
> like:
>
> lm(y ~ A * B + C, data=data)
>
> where the interaction of A and B should be in the formula before C. My
> goal is to simplify my presentation of models using the anova() statement.
> I have found that this should be possible using the terms.formula()
> function, but if anyone has an example that would be much appreciated.
>
> Cheers
>
> Andrew
>
>
> Andrew Robinson
> Senior Lecturer in Statistics Tel: +61-3-8344-9763
> Department of Mathematics and Statistics Fax: +61-3-8344 4599
> University of Melbourne, VIC 3010 Australia
> Email: a.robinson at ms.unimelb.edu.au Website: http://www.ms.unimelb.edu.au
>
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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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