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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 11:21:49 +0200

That works!!!! Thank you very much!

Regards,
Emanuele.

2011/4/15 Nick Cox <njcoxstata@gmail.com>:
> With numeric identifiers, id1 id2, or string identifiers id1 id2,
>
> gen first = cond(id1 < id2, id1, id2)
> gen second = cond(id1 > id2, id1, id2)
> egen group = group(first second)
>
> See my note as cited earlier. But I've not worked my way through the
> FAQ to see if and why their method differs.
>
> Nick
>
> On Fri, Apr 15, 2011 at 12:18 AM, emanuele mazzini
> <madsoenistata@gmail.com> wrote:
>> 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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