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st: Mata query


From   Adrian Mander <Adrian.Mander@mrc-hnr.cam.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Mata query
Date   Wed, 02 May 2007 13:56:44 +0100

Does anyone know why the first line works (below) but the second line doesn't?
and what exactly is select(0,0)? because I need an if statement to handle
this but don't know what this would be.

Anyone any ideas?


: (select( 0 , 1)) \ 1
1
+-----+
1 | 0 |
2 | 1 |
+-----+

: (select( 0 , 0)) \ 1
<istmt>: 3200 conformability error
r(3200);


thanks in advance
Ade
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