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
varFunc classes.
USAGE:
covariate(object) <- value
REQUIRED ARGUMENTS:
object
any object with a
covariate component.
value
a value to be assigned to the covariate associated with
object.
VALUE:
will depend on the method function; see the appropriate documentation.