<>
Or use the -count- provided by -collapse-:
*************
clear
inp group x
1 10
1 11
1 12
2 20
2 21
2 22
3 .
4 .
4 .
5 0
5 .
6 .
6 7
6 0
end
collapse (sum) x (count) nonmiss=x, by(group)
replace x=. if nonmiss==0
drop nonmiss
list
*************
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: [email protected]
[mailto:[email protected]] Im Auftrag von raoul reulen
Gesendet: Mittwoch, 10. Februar 2010 11:56
An: [email protected]
Betreff: Re: st: Collapse with sum function and missing values
Or use the following suggestion by Nick Cox:
http://www.stata.com/statalist/archive/2004-07/msg00783.html
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