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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: AW: dealing with duplicate "pairs" of columns |

Date |
Wed, 10 Feb 2010 15:03:53 -0000 |

See also for related technique 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 Nick n.j.cox@durham.ac.uk Martin Weiss clear* input byte(Person1_id ClosestPerson Person1_age) 1 2 10 2 1 20 3 1 30 4 3 40 end gen lower=min( Person1_id, ClosestPerson) gen upper=max( Person1_id, ClosestPerson) bys lower upper ( Person1_age): gen byte dup=!(_N==1) by lower upper ( Person1_age): replace dup=2 if _n==_N &dup!=0 l, noo Vitorino, Maria Ana I was wondering if there was a relatively simple way to achieve the following: My data looks like this: Person1_id ClosestPerson Person1_age 1 2 10 2 1 20 3 1 30 4 3 40 ... What I would like to do is to signal "duplicate" rows for which Person1 is the oldest. Since this is hard to explain, the resulting data would be for the example above: Person1_id ClosestPerson Person1_age dup 1 2 10 1 2 1 20 2 3 1 30 0 4 3 40 0 ... Note that the column dup has the following coding: dup=1 if there is another pair of ppl identical to the one in this row and Person1 is the youngest of the pair dup=2 if there is another pair of ppl identical to the one in this row and Person1 is the oldest of the pair dup=0 if there is no other pair of ppl identical to the one in this row * * 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: RE: AW: dealing with duplicate "pairs" of columns***From:*"Vitorino, Maria Ana" <vitorino@wharton.upenn.edu>

**References**:**st: dealing with duplicate "pairs" of columns***From:*"Vitorino, Maria Ana" <vitorino@wharton.upenn.edu>

**st: AW: dealing with duplicate "pairs" of columns***From:*"Martin Weiss" <martin.weiss1@gmx.de>

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