[Rd] Error in lme? (PR#488)

[Douglas Bates]

simon.frost@ed.ac.uk writes:

> I've just installed R for Windows - I've previously been using it on Linux -
> and I've run into a problem when using lme.
> 
> The lme routine throws up an error in the getGroups.data.frame command,
> complaining about an error in the formula:
> 
> Error in getGroups.data.frame(dataMix, groups) : 
>         Invalid formula for groups
> 
> getGroups works just fine, and I haven't run into this problem previously.

Could you send us an example call that generates this error
(preferably using one of the data sets that comes with R)?
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