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\name{effectsTheme}
\alias{effectsTheme}
\title{Set the lattice Theme for Effect Plots}
\description{
Set the \pkg{lattice} theme (see \code{\link[lattice]{trellis.device}}) appropriately for effect plots. This function is invoked
automatically when the \pkg{effects} package is loaded \emph{if} the \pkg{lattice} package hasn't previously been loaded. A typical
call is \code{lattice::trellis.par.set(effectsTheme())}.
}
\usage{
effectsTheme(strip.background = list(col = gray(seq(0.95, 0.5, length = 3))),
strip.shingle = list(col = "black"), clip = list(strip = "off"),
superpose.line = list(lwd = c(2, rep(1, 6))), col)
}
\arguments{
\item{strip.background}{colors for the background of conditioning strips at the top of each panel; the default uses shades of gray and
makes allowance for up to three conditioning variables.}
\item{strip.shingle}{when lines rather than numeric values are used to indicate the values of conditioning variables, the default sets the color of
the lines to black.}
\item{clip}{the default allows lines showing values of conditioning variables to extend slightly beyond the boundaries of
the strips---making the lines more visible at the extremes.}
\item{superpose.line}{the default sets the line width of the first (of seven) lines to 2.}
\item{col}{an optional argument specifying the colors to use for lines and symbolst:
if \code{col = "car"}, then the color palette for the \pkg{car} package is used (see \code{\link[car]{carPalette}});
\code{col = "R"}, then the current R palette (ignoring the first entry which is \code{"black"} in the standard R palette) is used (see \code{\link[grDevices]{palette}});
if \code{col = "colorblind"}, then a colorblind-friendly palette (from \url{https://jfly.uni-koeln.de/color/} but ignoring black) is used;
if a vector of color specifications, then these are used.
If \code{col} isn't specified then the current \pkg{lattice} colors are used.}
}
\value{
a list suitable as an argument for \code{\link[lattice]{trellis.par.set}}; current values of modified parameters are
supplied as an attribute.
}
\author{John Fox \email{jfox@mcmaster.ca}}
\seealso{\code{\link[lattice]{trellis.device}}, \code{\link[lattice]{trellis.par.set}}}
\examples{
\dontrun{
lattice::trellis.par.set(effectsTheme())
}
}
\keyword{utilities}
\keyword{device}
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