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% File nlme/man/plot.Variogram.Rd
% Part of the nlme package for R
% Distributed under GPL 2 or later: see nlme/LICENCE
% $Id: plot.Variogram.Rd,v 1.9.2.1 2003/04/17 22:28:45 bates Exp $
\name{plot.Variogram}
\title{Plot a Variogram Object}
\usage{
\method{plot}{Variogram}(x, smooth, showModel, sigma, span, xlab,
ylab, type, ylim, grid, \dots)
}
\alias{plot.Variogram}
\arguments{
\item{x}{an object inheriting from class \code{Variogram},
consisting of a data frame with two columns named \code{variog} and
\code{dist}, representing the semi-variogram values and the corresponding
distances.
}
\item{smooth}{an optional logical value controlling whether a
\code{loess} smoother should be added to the plot. Defaults to
\code{TRUE}, when \code{showModel} is \code{FALSE}.
}
\item{showModel}{an optional logical value controlling whether the
semi-variogram corresponding to an \code{"modelVariog"} attribute of
\code{x}, if any is present, should be added to the
plot. Defaults to \code{TRUE}, when the \code{"modelVariog"}
attribute is present.
}
\item{sigma}{an optional numeric value used as the height of a
horizontal line displayed in the plot. Can be used to represent the
process standard deviation. Default is \code{NULL}, implying that no
horizontal line is drawn.
}
\item{span}{an optional numeric value with the smoothing parameter for
the \code{loess} fit. Default is 0.6.
}
\item{xlab,ylab}{optional character strings with the x- and y-axis
labels. Default respectively to \code{"Distance"} and
\code{"SemiVariogram"}.
}
\item{type}{an optional character indicating the type of plot. Defaults
to \code{"p"}.
}
\item{ylim}{an optional numeric vector with the limits for the
y-axis. Defaults to \code{c(0, max(x$variog))}.
}
\item{grid}{an optional logical value indicating whether a grid should
be added to plot. Default is \code{FALSE}.}
\item{\dots}{optional arguments passed to the Trellis \code{xyplot} function.}
}
\description{
an \code{xyplot} of the semi-variogram versus the distances is
produced. If \code{smooth = TRUE}, a \code{loess} smoother is added to
the plot. If \code{showModel = TRUE} and \code{x} includes an
\code{"modelVariog"} attribute, the corresponding semi-variogram
is added to the plot.
}
\value{
an \code{xyplot} Trellis plot.
}
\author{Jose Pinheiro \email{Jose.Pinheiro@pharma.novartis.com} and Douglas Bates \email{bates@stat.wisc.edu}}
\seealso{\code{\link{Variogram}},
\code{\link[lattice]{xyplot}},
\code{\link[modreg]{loess}}}
\examples{
fm1 <- lme(follicles ~ sin(2*pi*Time) + cos(2*pi*Time), Ovary)
plot(Variogram(fm1, form = ~ Time | Mare, maxDist = 0.7))
}
\keyword{models}
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