| Covariate.varFunc {nlme} | R Documentation |
The covariate(s) used in the calculation of the weights of the
variance function represented by object is (are) replaced by
value. If object has been initialized, value must
have the same dimensions as getCovariate(object).
## S3 replacement method for class 'varFunc' covariate(object) <- value
object |
an object inheriting from class |
value |
a value to be assigned to the covariate associated with
|
a varFunc object similar to object, but with its
covariate attribute replaced by value.
José Pinheiro and Douglas Bates bates@stat.wisc.edu
vf1 <- varPower(1.1, form = ~age) covariate(vf1) <- Orthodont[["age"]]