Anne,
Here is one way:
keep if mod(_n,2) == 1
Hope this helps,
Scott
> -----Original Message-----
> From: [email protected] [mailto:owner-
> [email protected]] On Behalf Of Anne-C�lia Disdier
> Sent: Wednesday, February 09, 2005 7:07 AM
> To: [email protected]
> Subject: st: "dyadic" data
>
> Dear all,
> I`ve the following "dyadic" dataset (where var1 and var2 are string
> variables):
>
> var1 var2
> a b
> b a
> a c
> c a
> b c
> c b
>
> In my case, ab and ba, ac and ca, bc and cb are the same observations. I
> just
> want to keep one of the two observations (for example ab, bc, ac). How can
> ask
> Stata to delete the second observation (ba, cb, ca)
>
> Many thanks for your answer!
> Anne
>
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