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st: ssc: new routine for joining scatterplot points


From   Allan Reese <R.A.Reese@hull.ac.uk>
To   Stata distribution list <statalist@hsphsun2.harvard.edu>
Subject   st: ssc: new routine for joining scatterplot points
Date   Fri, 6 Feb 2004 16:15:31 +0000 (GMT)

Routines have just been released via ssc to draw "convex hulls".  In case
this phrase does not immediately catch your imagination, let me explain
that the convex hull is simply the polygon enclosing a set of points in
2D (extensions to 3+D are more complex).  If you think of your scatterplot
as pins in a board, the convex hull could be found by stretching an
elastic band round the outside and letting it fall into place.  The
cvxhull routine draws hulls round all or subsets of points, so is a useful
tool if only for visualizing clusters of points identified by a grouping
variable.

type  "ssc whatsnew"  to find out more

Enjoy.

R. Allan Reese                       Email:     r.a.reese@hull.ac.uk
Associate Manager GRI                Direct voice:   +44 1482 466845
Graduate School                      Voice messages: +44 1482 466844
Hull University, Hull HU6 7RX, UK.   Fax:            +44 1482 466436
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