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

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Loop year variable |

Date |
Sun, 21 Oct 2012 13:06:55 +0100 |

I gathered from your original posting that you had yearly data. I understand that matches may be more frequent than yearly, but I can't advise further without seeing what your data look like as the trade data and match data are not obviously compatible. Nick On Sun, Oct 21, 2012 at 1:00 PM, emanuele mazzini <madsoenistata@gmail.com> wrote: > 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/

**Follow-Ups**:**Re: st: Loop year variable***From:*emanuele mazzini <madsoenistata@gmail.com>

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

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

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

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