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

 From Billy Schwartz 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 13:22:30 -0400

```If you want to keep the individual observations but want a variable
containing the sum of y1 as follows

hhid  childid y1 sumy1
1       1       1     2
1        2      1     2
1        3      0     2
2        1      0     0
2        2      0     0

Then you can write (and you may need to -sort hhid- first)

. by hhid: egen sumy1 = total(y1)

On Tue, Aug 2, 2011 at 12:09 PM, Christophe Kolodziejczyk
<ck.statalist@gmail.com> wrote:
>
> 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
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/help.cgi?search
> > *   http://www.stata.com/support/statalist/faq
> > *   http://www.ats.ucla.edu/stat/stata/
> >
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

*
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*   http://www.stata.com/support/statalist/faq
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```

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