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% File nlme/man/glsStruct.Rd
% Part of the nlme package for R
% Distributed under GPL 2 or later: see nlme/LICENCE.note
\name{glsStruct}
\title{Generalized Least Squares Structure}
\usage{
glsStruct(corStruct, varStruct)
}
\alias{glsStruct}
\arguments{
\item{corStruct}{an optional \code{corStruct} object, representing a
correlation structure. Default is \code{NULL}.}
\item{varStruct}{an optional \code{varFunc} object, representing a
variance function structure. Default is \code{NULL}.}
}
\description{
A generalized least squares structure is a list of model components
representing different sets of parameters in the linear
model. A \code{glsStruct} may contain \code{corStruct} and
\code{varFunc} objects. \code{NULL} arguments are not included in the
\code{glsStruct} list.
}
\value{
a list of model variance-covariance components determining the
parameters to be estimated for the associated linear model.
}
\author{José Pinheiro and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{
\code{\link{corClasses}},
\code{\link{gls}},
\code{\link{residuals.glsStruct}},
\code{\link{varFunc}} }
\examples{
gls1 <- glsStruct(corAR1(), varPower())
}
\keyword{models}
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