On 18 January 2011 22:52, Peter Ehlers <ehl...@ucalgary.ca> wrote:
> Since you don't provide data, let's borrow from the
> help(droplevels) page:
>
As an aside, is it normal practice then to attach data files to questions on
this mailing list? I might do that in future if it's possible and
acceptable.
Ben.
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