This has come up a couple of times on the list in the past month or so
(and regularly appears in the archives). Check/search the archives for
the threads.
Here are a few starters...
http://www.stata.com/statalist/archive/2008-10/msg00829.html
http://www.stata.com/statalist/archive/2008-10/msg00653.html
Neil
--
"We should make things as simple as possible, but not simpler" - Anon (not Albert Einstein)
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