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

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

Subject |
RE: st: creating a variable using -if-? programming needed? |

Date |
Thu, 15 May 2008 15:24:34 +0100 |

Using the same assumption of a Noah's ark situation in which everyone is paired off, with no dependents, in-laws, etc., there are other minor variations on Scott's theme. bysort site family: gen partner_income = cond(_n == 1, personal[2], personal[1]) bysort site family: gen partner_income = personal[3 - _n] I am fond of the second. If it looks puzzling, just go through the two cases. If _n is 1, then 3 - _n is 2, and vice versa. The key underlying principle, if it is not familiar, is that under -by:- _n is interpreted within groups, not within the entire dataset. There is a leisurely tutorial at <http://www.stata-journal.com/sjpdf.html?articlenum=pr0004> N.B. this is in the public domain. Nick n.j.cox@durham.ac.uk Scott Merryman What defines a partner? Someone within the same two-person family? Perhaps something like this: clear input site family person personal_labor_income 1 1 1 2000 1 1 2 2300 1 2 1 200 1 2 3 3000 2 10 4 3400 2 10 5 3500 end bysort site family : gen partner_income = cond(_n ==1, personal[_n+1],personal[_n-1]) Ekaterina Selezneva > I have a dataset with some information on a sample of married > couples. For identifying a single person, one needs to know a > "site"-number, "family"-number withing the site, and then the > "person"-number within the family. As this is a subsample of some > bigger dataset, so not all sites/families/persons are presented in > it. Let's say, something like: > > site family person personal_labor_income > 1 1 1 2000 > 1 1 2 2300 > 1 2 1 200 > 1 2 3 3000 > 2 10 4 3400 > 2 10 5 3500 > > THE PROBLEM: I need to create a variable containing the "personal > labor income" of partner. > > Unfortunately, I've spent a day, and havn't > succeded to solve this seemingly simple problem. I will be grateful for > any hints. * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re[2]: st: creating a variable using -if-? programming needed?***From:*Ekaterina Selezneva <eka.selez@gmail.com>

**References**:**st: creating a variable using -if-? programming needed?***From:*Ekaterina Selezneva <eka.selez@gmail.com>

**Re: st: creating a variable using -if-? programming needed?***From:*"Scott Merryman" <scott.merryman@gmail.com>

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