Re: [R] Boxplot philosophy {was "Boxplot in R"}

From: Andrew Robinson <A.Robinson_at_ms.unimelb.edu.au>
Date: Tue 12 Jul 2005 - 18:48:04 EST

Rob Hyndman has written on a version of the boxplot that can show bimodality. See, particularly, Figure 2 in:

Hyndman, R.J. (1996) "Computing and graphing highest density regions", Amer. Statist., 50, 120-126.

Andrew

On Tue, Jul 12, 2005 at 10:28:04AM +0200, Martin Maechler wrote:
> >>>>> "Spencer" == Spencer Graves <spencer.graves@pdf.com>
> >>>>> on Mon, 11 Jul 2005 19:08:39 -0700 writes:
>
> Spencer> I'll bite: How does one detect bimodalidty from a boxplot?
>
> One does not,
> and that (whole area) was the main reason I mentioned "violin
> plots" which do show features such as bimodality:
>
> There's a simple violin plot in the (recommended and hence
> always available) package "lattice"
>
> library(lattice)
> example(panel.vioplot)

>
> but for the sake of bimodality {and the version of violin plot
> that was in the 1998 Am.Stat. paper}
>
> install.packages("vioplot") # if needed
> example(vioplot)
>
> Both of these examples use the basic boxplot but *add* to it, so
> you can, e.g., clearly discern bimodality.
>
> Martin Maechler
>
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-- 
Andrew Robinson
Senior Lecturer in Statistics                       Tel: +61-3-8344-9763
Department of Mathematics and Statistics            Fax: +61-3-8344-4599
University of Melbourne, VIC 3010 Australia
Email: a.robinson_at_unimelb.edu.au       Website: http://www.ms.unimelb.edu.au

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Received on Tue Jul 12 18:52:03 2005

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