.\" -*- nroff -*- generated from .Rd format
.BG
.FN varFunc
.TL
Variance Function Structure
.DN
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.
.CS
varFunc(object)
.RA
.AG object
either an one-sided formula specifying a variance
covariate, or an object inheriting from class `varFunc',
representing a variance function structure.
.RT
an object from class `varFunc', representing a variance function
structure.

.SA
`varFixed', `varWeights.varFunc',
`coef.varFunc'
.EX
vf1 <- varFunc(~age)
.KW models
.WR
