Dear statalisters (and, to a greater extent, Stata staff),
is there an easy way to code the distance between two points on the Earth
surface along the great-circle arc given their longitudes and latitudes? I
want to cluster a few geographical locations... I know a messy way to do
it -- to go through all 2400 lines of cluster.ado and find out where the
(dis)similarity measures are computed, and make a new one that I need. (Is
this possible with the programmer's extensions to cluster that Stata
provides for, instead? I looked it up rather quickly, and decided it is
not quite what I need.) My gut feeling though is that it is the
responsibility of the built-in -_cluster-, so there is not much I can do
to define my own distance function, is there?
--- Stas Kolenikov
-- Ph.D. student in Statistics at UNC-Chapel Hill
- http://www.komkon.org/~tacik/ -- [email protected]
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