nlme (version 3.1-137)

Initialize.varFunc: Initialize varFunc Object

Description

This method initializes object by evaluating its associated covariate(s) and grouping factor, if any is present, in data; determining if the covariate(s) need to be updated when the values of the coefficients associated with object change; initializing the log-likelihood and the weights associated with object; and assigning initial values for the coefficients in object, if none were present. The covariate(s) will only be initialized if no update is needed when coef(object) changes.

Usage

# S3 method for varFunc
Initialize(object, data, …)

Arguments

object

an object inheriting from class "varFunc", representing a variance function structure.

data

a data frame in which to evaluate the variables named in formula(object).

…

this argument is included to make this method compatible with the generic.

Value

an initialized object with the same class as object representing a variance function structure.

See Also

Initialize

Examples

# NOT RUN {
vf1 <- varPower( form = ~ age | Sex )
vf1 <- Initialize( vf1, Orthodont )
# }