This function is generic; method functions can be written to handle
specific classes of objects. Classes which already have methods for
this function include
any fitted model object from which fixed effects estimates can be extracted.
some methods for this generic function require additional arguments.
will depend on the method function used; see the appropriate documentation.
Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer.
## see the method function documentation
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