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st: -parplot- available on SSC


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: -parplot- available on SSC
Date   Fri, 18 Jul 2003 15:33:38 +0100

Thanks to Kit Baum, a new -parplot- package has been 
added to SSC. Stata 8 is required. 

. ssc type parplot.hlp 

gives a fuller description than is supplied below, 
while 

. ssc inst parplot 

installs the package. 

-parplot- draws parallel coordinates plots. 
Each variable is plotted on a separate vertical or 
horizontal scale and the values for each observation 
are shown by connected line segments. 

Such plots have a long history under various guises. 
When I was a student a variant was used without fuss to show 
the results of series of rowing races at my university, 
but they appear to be among tools widely promoted 
with a great deal of hoopla under banners such as 
"visualisation" and "data mining". 

Wegman (1990) gave a definitive account for a 
statistical readership. 

John Gleason wrote -parcoord- for Stata 4 and 
published it in STB-29. This works very well on 
Stata 4 through 7, but a program for Stata 8 
is justified not only by the desire for producing 
graphics similar to those of Stata 8, but also 
by the fact that some things difficult or impossible 
in Stata 4 are now much easier, for example, being 
able to choose between vertical and horizontal axes.
John's program was a very useful starting point, 
although in the event most of the code is new. 

Vince Wiggins made very helpful comments.

Gleason, J.R. 1996. Graphing high-dimensional data 
using parallel coordinates. Stata Technical Bulletin 
29: 10-14 (STB Reprints 5: 53-60).

Wegman, E.J. 1990. Hyperdimensional data analysis using 
parallel coordinates. Journal, American Statistical 
Association 85: 664-675.

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