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st: Network - double back relation


From   Simon Falck <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: Network - double back relation
Date   Wed, 06 Nov 2013 10:24:29 +0100

Hi Statalist,

Using Stata 13.1 and aiming at a simple descriptive network plot but bump into the issue of double back relations among the edges, i.e. some of the networks actually double back on themselves. Here is an sample of my dataset:

source    target    weight
1    1    1
2    2    1
3    3    3
3    5    3
3    8    3
4    4    1
5    3    3
5    5    16
5    8    3
6    6    1
7    7    1
8    3    3
8    5    3
8    8    21
9    9    1

For instance, there is a relationship between source '3' and target '5', and thus also between target '5' and source '3'. My question is how do I manage to only keep one way relation between 'source' and 'target', i.e. how do I delete (drop) the double back relationship?

I could be noted that double back relationships has been mentioned in an earlier discussion: http://www.stata.com/statalist/archive/2013-09/msg00142.html

Thanks in advance!

Best,
Simon
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