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\name{panel.car}
\alias{panel.car}
\title{Panel Function for Coplots}
\description{
a panel function for use with \code{coplot} that plots points, a lowess line,
and a regression line.
}
\usage{
panel.car(x, y, col, pch, cex=1, span=0.5, lwd=2,
reg.line=lm, lowess.line=TRUE, ...)
}
\arguments{
\item{x}{vector giving horizontal coordinates.}
\item{y}{vector giving vertical coordinates.}
\item{col}{point color.}
\item{pch}{plotting character for points.}
\item{cex}{character expansion factor for points.}
\item{span}{span for lowess smoother.}
\item{lwd}{line width, default is \code{2}.}
\item{reg.line}{function to compute coefficients of regression line,
or \code{FALSE} for no line.}
\item{lowess.line}{if \code{TRUE} plot lowess smooth.}
\item{\dots}{other arguments to pass to functions \code{lines}
and \code{regLine}.}
}
\value{
\code{NULL}. This function is used for its side effect: producing
a panel in a coplot.
}
\author{John Fox \email{jfox@mcmaster.ca}}
\seealso{\code{\link[graphics]{coplot}}, \code{\link{regLine}}}
\examples{
coplot(prestige ~ income|education, panel=panel.car,
col="red", data=Prestige)
}
\keyword{aplot}
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