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Re: st: Collapse with sum function and missing values


From   raoul reulen <r.c.reulen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Collapse with sum function and missing values
Date   Wed, 10 Feb 2010 10:55:43 +0000

Or use the following suggestion by Nick Cox:

http://www.stata.com/statalist/archive/2004-07/msg00783.html
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