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Re: st: Creating a Count Variable in STATA


From   Paul Millar <paul.millar@shaw.ca>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Creating a Count Variable in STATA
Date   Sat, 02 Apr 2005 18:25:45 -0700

Much better!!

At 05:05 PM 02/04/2005, you wrote:
Or how about this:

sort ccode years
by ccode: gen nukecount = sum(nukes)

--- In statalist@yahoogroups.com, Paul Millar <paul.millar@s...> wrote:
> try this...
>
> gen nyears=0
> label variable nyears "Number of years country has nukes"
>
> sort ccode
> gen nukeyear=year*nukes
> by ccode: egen minyear=min(nukeyear) if nukeyear>0
> by ccode: replace nyears=year-minyear+1 if nukeyear>0
> drop nukeyear minyear
>
> - Paul Millar
> Sociology
> University of Calgary
>
> At 03:14 PM 02/04/2005, you wrote:
> >To whom it may concern:
> >
> >I have a time series dataset organized by country year, with one
entry per
> >year per country. I want to create a count variable that measures the
> >number of years it has been since a given country has acquired nuclear
> >weapons, the variable of interest for my study. But I am having
trouble
> >getting the coding entirely right. The variables that I "think" matter
> >here are:
> >
> >-ccode: the country code for each country
> >-nukes: a binary variable that is 0 if a country does not have nuclear
> >weapons and a 1 if it has nuclear weapons
> >-year: this is pretty obvious. .
> >
> >The current coding I have is:
> >
> >gen nukecount=0
> >replace nukecount=(nukecount[_n-1]+1) if ((ccode==ccode[_n-1]) &
> >(nukes==1) & (nukes[_n-1]==1))
> >
> >If anyone has some advice about what I am doing wrong and how to
> >potentialy correct it. . that would be fantastic and I would really
> >appreciate it.
> >
> >Sincerely,
> >Michael Horowitz
> >
>
>************************************************************************* ******
> >
> >Michael Horowitz
> >78 Kirkland Street, #1
> >Cambridge, MA 02138
> >
> >*
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>
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