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% File nlme/man/Initialize.reStruct.Rd
% Part of the nlme package for R
% Distributed under GPL 2 or later: see nlme/LICENCE
% $Id: Initialize.reStruct.Rd,v 1.1.2.1 2002/08/09 19:45:29 bates Exp $
\name{Initialize.reStruct}
\title{Initialize reStruct Object}
\usage{
\method{Initialize}{reStruct}(object, data, conLin, control, \dots)
}
\alias{Initialize.reStruct}
\arguments{
\item{object}{an object inheriting from class \code{reStruct},
representing a random effects structure and consisting of a list of
\code{pdMat} objects.}
\item{data}{a data frame in which to evaluate the variables defined in
\code{formula(object)}.}
\item{conLin}{a 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 model.}
\item{control}{an optional list with a single component \code{niterEM}
controlling the number of iterations for the EM algorithm used to
refine initial parameter estimates. It is given as a list for
compatibility with other \code{Initialize} methods. Defaults to
\code{list(niterEM = 20)}.}
\item{\dots}{some methods for this generic require additional
arguments. None are used in this method.}
}
\description{
Initial estimates for the parameters in the \code{pdMat} objects
forming \code{object}, which have not yet been initialized, are
obtained using the methodology described in Bates and Pinheiro
(1998). These estimates may be refined using a series of EM
iterations, as described in Bates and Pinheiro (1998). The number of
EM iterations to be used is defined in \code{control}.
}
\value{
an \code{reStruct} object similar to \code{object}, but with all
\code{pdMat} components initialized.
}
\author{Jose Pinheiro \email{Jose.Pinheiro@pharma.novartis.com} and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{\code{\link{reStruct}}, \code{\link{pdMat}},
\code{\link{Initialize}}
}
\keyword{models}
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