coef.varFunc function

varFunc Object Coefficients

This method function extracts the coefficients associated with the variance function structure represented by object.

## S3 method for class 'varFunc'
coef(object, unconstrained, allCoef, ...)
## S3 replacement method for class 'varIdent'
coef(object, ...) <- value

Arguments

• object: an object inheriting from class "varFunc"

  representing a variance function structure.

• unconstrained: a logical value. If TRUE the coefficients are returned in unconstrained form (the same used in the optimization algorithm). If FALSE the coefficients are returned in "natural", generally constrained form. Defaults to TRUE.

• allCoef: a logical value. If FALSE only the coefficients which may vary during the optimization are returned. If TRUE

  all coefficients are returned. Defaults to FALSE.

• value: a vector with the replacement values for the coefficients associated with object. It must be have the same length of coef{object} and must be given in unconstrained form. Object must be initialized before new values can be assigned to its coefficients.

• ...: some methods for this generic require additional arguments. None are used in this method.

Returns

a vector with the coefficients corresponding to object.

Author(s)

José Pinheiro and Douglas Bates

SIDE EFFECTS

On the left side of an assignment, sets the values of the coefficients of object to value.

See Also

varFunc

Examples

vf1 <- varPower(1)
coef(vf1)

coef(vf1) <- 2