| formula.varFunc {nlme} | R Documentation |
This method function extracts the formula associated with a
varFunc object, in which covariates and grouping factors are
specified.
formula(object)
object |
an object inheriting from class varFunc,
representing a variance function structure. |
if object has a formula attribute, its value is
returned; else NULL is returned.
Jose Pinheiro and Douglas Bates
formula(varPower(form = ~ fitted(.) | Sex))