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From |
emanuele mazzini <madsoenistata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Loop year variable |

Date |
Sun, 21 Oct 2012 14:00:25 +0200 |

Dear Mr Cox, thank you for your reply. The point, however, is that I cannot declare my dataset to be time-series (how would like but I cannot) due to the fact that some matches may take place once, twice or even more times in the same year. That is why I was looking form a manual command. I may better handle this first? And how can I do that in your opinion? Thanks in advance, E.M. 2012/10/21 Nick Cox <njcoxstata@gmail.com>: > This should yield to a treatment in terms of spells in the sense of > -tsspell- (SSC) and of > > SJ-7-2 dm0029 . . . . . . . . . . . . . . Speaking Stata: Identifying spells > . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox > Q2/07 SJ 7(2):249--265 (no commands) > shows how to handle spells with complete control over > spell specification > > Look at -tsspell- first; it is self-contained. That is, your panels > are defined by country pairs (dyads) and the start of a spell is > defined by a match taking place (or a particular result; I don't > follow exactly what you want, e.g what about draws?). Then a variable > defined by -tsspell- gives you sequence in spell. You may need to > subtract 1. > > I don't see that loops are needed. > > Nick > > On Sun, Oct 21, 2012 at 12:07 PM, emanuele mazzini > <madsoenistata@gmail.com> wrote: > >> I am not a new Stata user, but I have to admit I still encounter some >> problems with writing loops. A loop may not be the solution to the >> issue I am going to describe, but I thought it is tough. >> >> I do have a dataset where I have country-pair trade observations for >> years 1950-2006 as well as another information, which is football >> match result for some dyads. I therefore need to generate a variable >> that indicates how many years are passed since the last won/lost of a >> country versus another. Suppose FT_A and FT_B are the final results >> for team A and B. I thought to generate a variable as follows: >> >> gen int date_won=year if FT_A>FT_B | FT_A<FT_B >> >> in order to get a variable that is = year for every observation I have >> information about, which reports the year of the won/loss. I then >> thought to generate another variable (let's say yrs_won) to tell me >> how many years have gone by as follows: >> >> gen int yrs_won=year-date_won >> >> Unfortunately, I do not get what I want: the only value yrs_won >> assumes is 0, but for all years from 1983 until 2006 I would like it >> to be 1, 2,3 and so on. >> >> At the beginning I didn't realize the problem, now it may be occur due >> to the fact that date_won = year only for the year in which the match >> was played. I guess I need to do something such as writing a loop to >> let it spread over all cells of such variable, but I don't really know >> how to make it. Does anyone of you has any suggestion? >> > * > * 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/ * * 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: Loop year variable***From:*Nick Cox <njcoxstata@gmail.com>

**References**:**st: Loop year variable***From:*emanuele mazzini <madsoenistata@gmail.com>

**Re: st: Loop year variable***From:*Nick Cox <njcoxstata@gmail.com>

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