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Re: st: Boxplot with median *and* mean not possible?


From   Ronan Conroy <rconroy@rcsi.ie>
To   "statalist hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Boxplot with median *and* mean not possible?
Date   Thu, 05 Jun 2003 11:00:43 +0100

on 04/06/2003 4:35 pm, Ernest Berkhout at ernestb@seo.fee.uva.nl wrote:

> Hi Statalisters,
> 
> is it possible to create a boxplot in which not only the median is plotted,
> but also the mean? It appears to me that momentarily this option is not
> available, am i overlooking something? More experienced users could create
> such a graph with twoway-overlaying a rcap, a rbar and two scatters but of
> course it would be more elegant to have it as an option in <graph boxplot>
> imho...

Plotting the mean and the median is a little confusing unless you give them
distinct representations. JMP has a neat trick of superimposing the mean and
its confidence interval, plotted as a diamond, on the boxplot. It also draws
lines inside the diamond for comparison of means, but these are approximate
(same goes for simultaneous confidence intervals for the median, available
only, I think, in Data Desk).

Ronan M Conroy (rconroy@rcsi.ie)
Lecturer in Biostatistics
Royal College of Surgeons
Dublin 2, Ireland
+353 1 402 2431 (fax 2764)

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