Variance Function Structure
If object
is a one-sided formula, it is used as the argument to
varFixed
and the resulting object is returned. Else, if
object
inherits from class varFunc
, it is returned
unchanged.
varFunc(object)
object |
either an one-sided formula specifying a variance
covariate, or an object inheriting from class |
an object from class varFunc
, representing a variance function
structure.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
vf1 <- varFunc(~age)
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