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Re: st: Unique dyads


From   emanuele mazzini <madsoenistata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Unique dyads
Date   Fri, 15 Apr 2011 01:18:51 +0200

Thanks for your reply. Well, not really. I mean, they are actually are
the same thing, so I'm looking for a way to give "partnerA and
partnerB" and "partnerB and partnerA" the same value of the variable
dyad, since the one I mentioned before is not working. But I do need
to take into account both the pairs and cannot exclude one of them as
mine is an unbalanced panel, and I don't know if, for instance, the
couple "partnerA and partnerB" is also listed as "partnerB and
partnerA".

Hope this can help for any further suggestion,

Regards,

Emanuele.

2011/4/14 Nick Cox <njcoxstata@gmail.com>:
> I wrote something on this
>
> SJ-8-4  dm0043  . Tip 71: The problem of split identity, or how to group dyads
>        . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  N. J. Cox
>        Q4/08   SJ 8(4):588--591                                 (no commands)
>        tip on how to handle dyadic identifiers
>
> Whether the UCLA FAQ came first I don't know. I wasn't aware of it
> when I wrote.
>
> That aside, I don't follow your detail but guess that there is just
> one key point: if "partner A - partner B" is not equivalent to
> "partner B - partner A", as for example if the first partner is
> exporter and the second importer, then
>
> egen id = group(partnerA partner B)
>
> should suffice for unique identifiers.
>
> Nick
>
> On Thu, Apr 14, 2011 at 7:29 PM, emanuele mazzini
> <madsoenistata@gmail.com> wrote:
>
>> I am using an unbalanced dyadic panel dataset for which I need to
>> generate an unique dyad id. I looked at this help:
>> http://www.ats.ucla.edu/stat/stata/faq/dyad_ids.htm but the
>> suggestions I found here do not seem to work in my dataset. In
>> particular, the example shows that there is a certain symmetry, so
>> that the couple for which a=1 and b=5 is the same couple for which a=5
>> and b=1. Hence the couple considered gets the same value for the
>> variable dyad. But this does not work in my dataset because the couple
>> that gets a given value for the variables a and b is not the same
>> couple that gets the same values for b and a.
>> I can be more clear with the following example, which will be in terms
>> of countries, as in my dataset. Suppose I consider the couple USA and
>> GBR and I apply the suggested procedure. Then when the couple is:
>> USA-GBR i got a=1 and b=75
>>
>> but when I consider the reverted couple, i.e GBR-USA, i got a=46 and
>> b=90, which are absolutely not the same values, as the help i read
>> suggest.
>>
>> Anyone can please help me to understand why this is happening or has
>> an alternative way to proceed to get an unique dyad-id identifier?
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