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Re: st: Loop year variable
emanuele mazzini <firstname.lastname@example.org>
Re: st: Loop year variable
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,
2012/10/21 Nick Cox <email@example.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.
> On Sun, Oct 21, 2012 at 12:07 PM, emanuele mazzini
> <firstname.lastname@example.org> 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?
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