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st: collapse (sum) versus egen (sum)


From   Ben.Kriechel@roa.unimaas.nl
To   statalist@hsphsun2.harvard.edu
Subject   st: collapse (sum) versus egen (sum)
Date   Thu, 19 Aug 2004 09:38:42 +0200

While aggregating a dataset using collapse some strange results were
obtained: 

collapse (sum) aantal, by(opl114)

Did not give the same results as the same dataset gave in other programs. 

Checking with 

egen oplantal=sum(aantal),by(opl114)

though gave exactly the same (correct) number that other programs gave me.
Can somebody explain to me how the summation (could) differ between collapse
and egen? 

Thanks. 
--------------------------------------------

Ben Kriechel

Research Centre for Education
and the Labour Market
<Ben.Kriechel@roa.unimaas.nl> 

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