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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Unique dyads |

Date |
Thu, 14 Apr 2011 22:01:32 +0100 |

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? * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Unique dyads***From:*emanuele mazzini <madsoenistata@gmail.com>

**References**:**st: Unique dyads***From:*emanuele mazzini <madsoenistata@gmail.com>

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