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  Plots the mean (or other summary) of the response for two-way
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  Plots the mean (or other summary) of the response for two-way
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  combinations of factors, thereby illustrating possible interactions.
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  combinations of factors, thereby illustrating possible interactions.
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}
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}
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\usage{
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\usage{
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interaction.plot(x.factor, trace.factor, response, fun = mean,
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interaction.plot(x.factor, trace.factor, response, fun = mean,
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                 type = c("l", "p", "b"), legend = TRUE,
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                 type = c("l", "p", "b", "o", "c"), legend = TRUE,
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                 trace.label = deparse(substitute(trace.factor)),
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                 trace.label = deparse(substitute(trace.factor)),
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                 fixed = FALSE,
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                 fixed = FALSE,
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                 xlab = deparse(substitute(x.factor)),
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                 xlab = deparse(substitute(x.factor)),
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                 ylab = ylabel,
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                 ylab = ylabel,
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                 ylim = range(cells, na.rm=TRUE),
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                 ylim = range(cells, na.rm=TRUE),
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  \item{x.factor}{a factor whose levels will form the x axis.}
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  \item{x.factor}{a factor whose levels will form the x axis.}
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  \item{trace.factor}{another factor whose levels will form the traces.}
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  \item{trace.factor}{another factor whose levels will form the traces.}
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  \item{response}{a numeric variable giving the response}
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  \item{response}{a numeric variable giving the response}
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  \item{fun}{the function to compute the summary. Should return a single
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  \item{fun}{the function to compute the summary. Should return a single
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    real value.}
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    real value.}
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  \item{type}{the type of plot: lines or points.}
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  \item{type}{the type of plot (see \code{\link{plot.default}}): lines
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    or points or both.}
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  \item{legend}{logical. Should a legend be included?}
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  \item{legend}{logical. Should a legend be included?}
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  \item{trace.label}{overall label for the legend.}
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  \item{trace.label}{overall label for the legend.}
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  \item{fixed}{logical.  Should the legend be in the order of the levels
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  \item{fixed}{logical.  Should the legend be in the order of the levels
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    of \code{trace.factor} or in the order of the traces at their right-hand ends?}
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    of \code{trace.factor} or in the order of the traces at their right-hand ends?}
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  \item{xlab,ylab}{the x and y label of the plot each with a sensible default.}
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  \item{xlab,ylab}{the x and y label of the plot each with a sensible default.}