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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Fill in values for year in an unbalanced panel with known order |

Date |
Tue, 23 Oct 2012 17:19:05 +0100 |

This is a variation on a standard problem, on which see FAQ . . . . . . . . . . . . . . . . . . . . . . . Replacing missing values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox 1/12 How can I replace missing values with previous or following nonmissing values or within sequences? http://www.stata.com/support/faqs/data-management/ replacing-missing-values/ I suggest sort id, stable by id: replace year = cond(month == 1, year[_n-1] + 1, year[_n-1]) if missing(year) Nick On Tue, Oct 23, 2012 at 5:07 PM, Fernando Luco <flucoestatalist@gmail.com> wrote: > I'm trying to fill in the year of observations for which I know the > month and because of the order, I have no doubt about the year. > However, the year was not recorded. In particular, the data looks as > follows > > id year month > 1 1988 5 > 1 . 6 > 1 . 7 > 1 . 8 > 1 . 9 > 1 . 10 > 1 . 11 > 1 . 12 > 1 . 1 > 1 1989 2 > 1 1989 3 > 1 . 4 > 2 . 3 > 2 1989 4 > 2 1989 5 > 2 . 6 > 2 . 7 > 2 . 8 > 2 1989 9 > 2 . 10 > 2 . 11 > 2 . 12 > 2 . 1 > 2 1990 2 > 2 . 3 > > So, it is an unbalanced panel, that for each id might start and end at > a different year month combination, and I know that the order of the > observations within id is correct, so I'm sure that the first > observation for id==2 is of 1989 while the second observation that has > id==2 and month==3 (the last observation in the example) corresponds > to 1990. The main complication is that for some people I might have a > gap of more than one year between observations, which has made things > difficult. I would like to use the structure of the data to fill in > the data for year. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: Fill in values for year in an unbalanced panel with known order***From:*Fernando Luco <flucoestatalist@gmail.com>

**References**:**st: Fill in values for year in an unbalanced panel with known order***From:*Fernando Luco <flucoestatalist@gmail.com>

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