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Re: st: Spss's aggregate vs stata's collapse.


From   brendan.halpin@ul.ie (Brendan Halpin)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Spss's aggregate vs stata's collapse.
Date   Wed, 13 Apr 2011 10:05:09 +0100

On Wed, Apr 13 2011, Amadou DIALLO wrote:

> Hi,
> I am translating spss commands to stata and have trouble with different outputs.
> Results are different after "aggregate" for ceb (children ever born).

If the two files are exactly identical at the collapse/aggregate point
(and that's worth verifying, as the generate/if and compute/if commands
will not necessarily be identical in the case of missing values on the
right hand side), I would guess it has to do with SPSS and Stata
handling weights differently in this situation. You could test this by
re-running the manipulation without weights. Note the
"negative/zero/missing weight" warning you get with SPSS. 

If that is the problem, one possible workaround is to handle the weights
yourself: multiply ceb by the weight variable, and sum the result in the
-collapse- statement. 

Brendan
-- 
Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
Tel: w +353-61-213147  f +353-61-202569  h +353-61-338562;  Room F1-009 x 3147
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http://teaching.sociology.ul.ie/bhalpin/wordpress         twitter:@ULSociology
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