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\name{plotMeans}
\alias{plotMeans}
\title{Plot Means for One or Two-Way Layout}
\description{
Plots cell means for a numeric variable in each category of a factor or in each
combination of categories of two factors, optionally along with error bars based
on cell standard errors or standard deviations.
}
\usage{
plotMeans(response, factor1, factor2,
error.bars = c("se", "sd", "conf.int", "none"), level=0.95,
xlab = deparse(substitute(factor1)),
ylab = paste("mean of", deparse(substitute(response))),
legend.lab = deparse(substitute(factor2)), main = "Plot of Means",
pch = 1:n.levs.2, lty = 1:n.levs.2, col = palette())
}
\arguments{
\item{response}{Numeric variable for which means are to be computed.}
\item{factor1}{Factor defining horizontal axis of the plot.}
\item{factor2}{If present, factor defining profiles of means}
\item{error.bars}{If \code{"se"}, the default, error bars around means
give plus or minus one standard error of the mean; if \code{"sd"}, error
bars give plus or minus one standard deviation; if \code{"conf.int"}, error
bars give a confidence interval around each mean; if \code{"none"}, error
bars are suppressed.}
\item{level}{level of confidence for confidence intervals; default is .95}
\item{xlab}{Label for horizontal axis.}
\item{ylab}{Label for vertical axis.}
\item{legend.lab}{Label for legend.}
\item{main}{Label for the graph.}
\item{pch}{Plotting characters for profiles of means.}
\item{lty}{Line types for profiles of means.}
\item{col}{Colours for profiles of means}
}
\value{
The function invisibly returns \code{NULL}.
}
\author{John Fox \email{jfox@mcmaster.ca}}
\seealso{\code{\link[stats]{interaction.plot}}}
\keyword{hplot}
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