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  Pie charts are a very bad way of displaying information.
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  Pie charts are a very bad way of displaying information.
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  The eye is good at judging linear measures and bad at judging
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  The eye is good at judging linear measures and bad at judging
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  relative areas.  A bar chart or dot chart is a preferable way of
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  relative areas.  A bar chart or dot chart is a preferable way of
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  displaying this type of data.
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  displaying this type of data.
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  Cleveland (1985), page 264: \dQuote{Data that can be shown by pie charts
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  \bibcitet{|R:Cleveland:1985|page 264}: \dQuote{Data that can be shown by pie charts
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    always can be shown by a dot chart.  This means that judgements of
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    always can be shown by a dot chart.  This means that judgements of
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    position along a common scale can be made instead of the less
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    position along a common scale can be made instead of the less
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    accurate angle judgements.}
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    accurate angle judgements.}
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  This statement is based on the empirical investigations of Cleveland
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  This statement is based on the empirical investigations of Cleveland
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  and \I{McGill} as well as investigations by perceptual psychologists.
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  and \I{McGill} as well as investigations by perceptual psychologists.
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}
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}
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\references{
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\references{
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  \bibshow{R:Becker+Chambers+Wilks:1988}
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  \bibshow{R:Becker+Chambers+Wilks:1988,
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  Cleveland, W. S. (1985)
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    R:Cleveland:1985}
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  \emph{The Elements of Graphing Data}.
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  Wadsworth: Monterey, CA, USA.
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}
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}
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\seealso{
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\seealso{
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  \code{\link{dotchart}}.
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  \code{\link{dotchart}}.
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}
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}
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\examples{
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\examples{