Initialize.varFunc function

Initialize varFunc Object

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.

## S3 method for class '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.

Returns

an initialized object with the same class as object

representing a variance function structure.

Author(s)

José Pinheiro and Douglas Bates bates@stat.wisc.edu

See Also

Initialize

Examples

vf1 <- varPower( form = ~ age | Sex )
vf1 <- Initialize( vf1, Orthodont )