.\" -*- nroff -*- generated from .Rd format
.BG
.FN varFixed
.TL
Fixed Variance Function
.DN
This function is a constructor for the `varFixed' class,
representing a variance function with fixed variances. Letting v
denote the variance covariate defined in `value', the variance
function s2(v) for this class is
s2(v)=|v|. The variance covariate v is
evaluated once at initialization and remains fixed thereafter. No
coefficients are required to represent this variance function.
.CS
varFixed(value)
.RA
.AG value
a one-sided formula of the form `~ v' specifying a
variance covariate `v'. Grouping factors are ignored.
.RT
a `varFixed' object representing a fixed variance function
structure, also inheriting from class `varFunc'.

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