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st: RE: Other Box plots


From   "Wallace, John" <John_Wallace@affymetrix.com>
To   "'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Other Box plots
Date   Mon, 2 Dec 2002 09:06:33 -0800

Thanks for the tip about dotplots, Nick.  I can see that they will be useful
for exploring data sets, but the display looks too cluttered for summarizing
or presenting the information.

-----Original Message-----
From: Nick Cox [mailto:n.j.cox@durham.ac.uk] 

Wallace, John
> >
> > The built-in "box" parameter in the graph command comes close, in 
> > that the whiskers encompass 1.5*IQR and further outliers are  
> > plotted individually - but you can't use a
> > by(groupvar) to get an array of related plots.
> > The hbox addition I found in the STB files allows the by(groupvar)
> > arrangement, but the whiskers encompass the entire range of
> > data, rather than a function of the IQR.
> > This allows true outliers to dominate the
> > graph in an undesirable way, IMO

Make sure you are also aware of what -dotplot-
can do. With the addition of bars for median
and quartiles, you can have a hybrid display
which increasingly I offer prefer to boxplots.
Any broad patterns and any fine structure
are often clear simultaneously, the best of both
worlds.

Nick
n.j.cox@durham.ac.uk

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