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st: RE: RE: "dyadic" data


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: "dyadic" data
Date   Wed, 9 Feb 2005 13:55:24 -0000

If the whole dataset has exactly
this structure this is indeed the 
direct solution. 

Nick 
n.j.cox@durham.ac.uk 

Scott Merryman
 
> Here is one way:
> 
> keep if mod(_n,2) == 1
 
Anne-CÚlia Disdier

> > 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)
> > 

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