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st: processing time


From   Jon Schwabish <jschwabi@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: processing time
Date   Thu, 22 Mar 2007 09:55:08 -0700 (PDT)

Quick question:

Which is more efficient (in terms of processing time)?

drop if a==.
drop if b==.

  OR 

drop if a==. | b==.

(where a and b are any variables of choice).

Thanks.


 
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