Extract varFunc Covariate
This method function extracts the covariate(s) associated with the
variance function represented by object
, if any is present.
## S3 method for class 'varFunc' getCovariate(object, form, data)
object |
an object inheriting from class |
form |
an optional formula specifying the covariate to be
evaluated in |
data |
some methods for this generic require a |
if object
has a covariate
attribute, its value is
returned; else NULL
is returned.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
vf1 <- varPower(1.1, form = ~age) covariate(vf1) <- Orthodont[["age"]] getCovariate(vf1)
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