[R] extracting r-sq from lme model

[Douglas Bates]

"Buckley, Yvonne M" <y.buckley at ic.ac.uk> writes:

> I've been using the nlme library to construct lme models and I'd like to
> extract an r-sq value for the model - how do I do this?
> 
> With glm I just used the reported (null deviance-deviance)/(null deviance).
> Deviance is not reported directly for lme nor can it be extracted using the
> deviance() function.  How do I work out the deviance or can I work out R-sq
> in some other way?

I'm not sure that there is a definition of an r-sq for linear
mixed-effects models.  If you can give me a formula I can perhaps tell
you how to calculate the required quantities from a fitted lme model.
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