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Re: st: variable that counts double observations..


From   "Ashim Kapoor" <ashimkapoor@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: variable that counts double observations..
Date   Wed, 12 Nov 2008 20:41:14 +0530

Hello,

egen var=_n , by(group)
by group : replace var=var-1 if mod(var,2)==0

I think this should work.

What the second line says is that for every even number var should
have the value of the previous var which is itself -1 .

Can someone approve this ? I am not 100% certain.

Thank you,
Ashim.


On Wed, Nov 12, 2008 at 4:36 PM, Linn Renée Naper <linn.naper@ecgroup.no> wrote:
> Hi Statalist
>
> egen var=_n, by(group) will give me a variable counting from 1 til N within each group of the data.
> BUT: how do I tell stata that the observations are double in the sense that I need a variable that repeats each number ones,
> like this: 11 22 33 44.... instead of 1 2 3 4.....
> I need this variable in order to collapse the data.
>
> Thanks
>
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