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: [email protected]
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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