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% $Id: model.matrix.reStruct.Rd,v 1.7 2002/03/05 14:59:39 bates Exp $
\name{model.matrix.reStruct}
\title{reStruct Model Matrix}
\usage{
\method{model.matrix}{reStruct}(object, data, contrast, \dots)
}
\alias{model.matrix.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{contrast}{an optional named list specifying the contrasts to be used
for representing the \code{factor} variables in \code{data}. The
components names should match the names of the variables in
\code{data} for which the contrasts are to be specified. The
components of this list will be used as the \code{contrasts}
attribute of the corresponding factor. If missing, the default
contrast specification is used.}
\item{\dots}{some methods for this generic require additional
arguments. None are used in this method.}
}
\description{
The model matrices for each element of \code{formula(object)},
calculated using \code{data}, are bound together column-wise. When
multiple grouping levels are present (i.e. when \code{length(object) >
1}), the individual model matrices are combined from innermost (at
the leftmost position) to outermost (at the rightmost position).
}
\value{
a matrix obtained by binding together, column-wise, the model matrices
for each element of \code{formula(object)}.
}
\author{Jose Pinheiro \email{Jose.Pinheiro@pharma.novartis.com} and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{\code{\link{model.matrix}}, \code{\link{contrasts}},
\code{\link{reStruct}}, \code{\link{formula.reStruct}}}
\examples{
rs1 <- reStruct(list(Dog = ~day, Side = ~1), data = Pixel)
model.matrix(rs1, Pixel)
}
\keyword{models}
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