glsStruct {nlme}R Documentation

Generalized Least Squares Structure

Description

A generalized least squares structure is a list of model components representing different sets of parameters in the linear model. A glsStruct may contain corStruct and varFunc objects. NULL arguments are not included in the glsStruct list.

Usage

glsStruct(corStruct, varStruct)

Arguments

corStruct an optional corStruct object, representing a correlation structure. Default is NULL.
varStruct an optional varFunc object, representing a variance function structure. Default is NULL.

Value

a list of model variance-covariance components determining the parameters to be estimated for the associated linear model.

Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

See Also

gls, corClasses, varFunc

Examples

gls1 <- glsStruct(corAR1(), varPower())
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