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Re: st: -collapse- command

From   Neil Shephard <>
Subject   Re: st: -collapse- command
Date   Wed, 16 Jun 2010 15:39:14 +0000

On Wed, Jun 16, 2010 at 3:32 PM, Abhimanyu Arora
<> wrote:
> Dear statalist
> I have 4 variables country, year,type of riot, no. of riots and would
> like to finally have country, year, riots where riots are sum across
> all types.
> I tried using collapse country city (sum) riots, by (year) but get a
> type mismatch error. Any suggestions?

collapse (sum) total_riots=riots, by(country year)

If you also have 'city' and want it by that as well then

collapse (sum) total_riots=riots, by(country city year)

See -man collapse- for the full syntax for the -collapse- command. If
you don't understand the syntax diagram then read -man language-.


"... no scientific worker has a fixed level of significance at which
from year to year, and in all circumstances, he rejects hypotheses; he
rather gives his mind to each particular case in the light of his
evidence and his ideas." - Sir Ronald A. Fisher (1956)

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