This function is generic; method functions can be written to handle
specific classes of objects. Classes which already have methods for
this function include all
covariate(object) <- value
any object with a
a value to be assigned to the covariate associated with
will depend on the method function; see the appropriate documentation.
Jos<c3><a9> Pinheiro and Douglas Bates firstname.lastname@example.org
## see the method function documentation
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