Doug,

Relating to your comment below, there are getting to be quite a few R
packages that fit mixed models in various forms.

I have found myself often wishing that there was a generic 'fixef' and
'ranef' in the 'stats' package (similar to 'coef') to make it easier to
work with different methods for these extractors.  The different class
systems (S3, S4), different packages, and ever-changing R core (e.g.
mandatory namespaces) have forced me to write and re-write multiple times
the methods for fixef and ranef to support different packages.

Any thoughts on this?

Kevin Wright

The problem may be due to MEMSS bringing in other packages that mask
> the definition of fixef in lme4.  It works for me (see enclosed) if I
> use
> data(Orthodont, package="MEMSS")
> instead.
>

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