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% $Id: Initialize.lmeStruct.Rd,v 1.1.2.1 2002/08/09 19:45:29 bates Exp $
\name{Initialize.lmeStruct}
\title{Initialize an lmeStruct Object}
\usage{
\method{Initialize}{lmeStruct}(object, data, groups, conLin, control, \dots)
}
\alias{Initialize.lmeStruct}
\arguments{
\item{object}{an object inheriting from class \code{lmeStruct},
representing a list of linear mixed-effects model components, such as
\code{reStruct}, \code{corStruct}, and \code{varFunc} objects.}
\item{data}{a data frame in which to evaluate the variables defined in
\code{formula(object)}.}
\item{groups}{a data frame with the grouping factors corresponding to
the lme model associated with \code{object} as columns, sorted from
innermost to outermost grouping level.}
\item{conLin}{an optional condensed linear model object, consisting of
a list with components \code{"Xy"}, corresponding to a regression
matrix (\code{X}) combined with a response vector (\code{y}), and
\code{"logLik"}, corresponding to the log-likelihood of the
underlying lme model. Defaults to \code{attr(object, "conLin")}.}
\item{control}{an optional list with control parameters for the
initialization and optimization algorithms used in
\code{lme}. Defaults to \code{list(niterEM=20, gradHess=TRUE)},
implying that 20 EM iterations are to be used in the derivation of
initial estimates for the coefficients of the \code{reStruct}
component of \code{object} and, if possible, numerical gradient
vectors and Hessian matrices for the log-likelihood function are to
be used in the optimization algorithm.}
\item{\dots}{some methods for this generic require additional
arguments. None are used in this method.}
}
\description{
The individual linear mixed-effects model components of the
\code{lmeStruct} list are initialized.
}
\value{
an \code{lmeStruct} object similar to \code{object}, but with
initialized model components.
}
\author{Jose Pinheiro \email{Jose.Pinheiro@pharma.novartis.com} and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{\code{\link{lme}}, \code{\link{Initialize.reStruct}},
\code{\link{Initialize.corStruct}},
\code{\link{Initialize.varFunc}}, \code{\link{Initialize}}
}
\keyword{models}
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