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Re: st: How to find the sum of a variable by a group id


From   Christophe Kolodziejczyk <ck.statalist@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How to find the sum of a variable by a group id
Date   Tue, 2 Aug 2011 18:09:11 +0200

write instead
collapse (sum) y1, by(hhid)

Christophe


2011/8/2 Urmi Bhattacharya <ub3@indiana.edu>:
> Dear Statalisters,
>
> I have the following data set.
>
> hhid  childid y1
> 1       1       1
> 1        2      1
> 1        3      0
> 2        1      0
> 2        2      0
>
>
> I need to find the sum of y1 per hhid, i.e., i need to get the
> following data set
>
> hhid    sumy1
> 1         2
> 2         0
>
> How do I get that?
>
> I tried the following
>
> collapse (sum) y1, by hhid
> it gives me the following error:
>
> option by incorrectly specified
> r(198);
> I am using Stata 11.2.
>
> It is a simple enough thing I am sure, but I am just not able to work
> it out. It would be great if someone could tell me where am i going
> wrong?
>
> Best
>
> Urmi
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