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% File nlme/man/Dim.corStruct.Rd
% Part of the nlme package for R
% Distributed under GPL 2 or later: see nlme/LICENCE
% $Id: Dim.corStruct.Rd,v 1.7 2002/03/05 14:59:39 bates Exp $
\name{Dim.corStruct}
\title{Dimensions of a corStruct Object}
\usage{
\method{Dim}{corStruct}(object, groups, \dots)
}
\alias{Dim.corStruct}
\arguments{
\item{object}{an object inheriting from class \code{corStruct},
representing a correlation structure.}
\item{groups}{an optional factor defining the grouping of the
observations; observations within a group are correlated and
observations in different groups are uncorrelated.}
\item{\dots}{some methods for this generic require additional
arguments. None are used in this method.}
}
\description{
if \code{groups} is missing, it returns the \code{Dim} attribute of
\code{object}; otherwise, calculates the dimensions associated with
the grouping factor.
}
\value{
a list with components:
\item{N}{length of \code{groups}}
\item{M}{number of groups}
\item{maxLen}{maximum number of observations in a group}
\item{sumLenSq}{sum of the squares of the number of observations per
group}
\item{len}{an integer vector with the number of observations per
group}
\item{start}{an integer vector with the starting position for the
observations in each group, beginning from zero}
}
\author{Jose Pinheiro \email{Jose.Pinheiro@pharma.novartis.com} and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{\code{\link{Dim}}, \code{\link{Dim.corSpatial}}}
\examples{
Dim(corAR1(), getGroups(Orthodont))
}
\keyword{models}
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