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Re: st: RE: RE: Re: Variable generation
Thanks Nick!
Suryadipta.
On Thu, 14 Jun 2007 20:01:10 +0100
"Nick Cox" <[email protected]> wrote:
... , by(octy)
Nick
[email protected]
Nick Cox
Your code is twice as long as needed. As -egen, total()-
can feed on expressions, consider
egen x1 = total((1/dist) * exp)
-egen, total()- is the current name of -egen, sum()-.
Nick
[email protected]
Roy,Suryadipta
> I probably just sorted it out without any programming-
> would get beck for more help later on!
>
> g dt=(1/dist)*exp
> egen x1=sum(dt), by(octy)
Roy,Suryadipta
> > I have data on 5 countries (a, b, c, d, e) for octy,
> >dcty, dist, d1, and exp. The data are given below:
> >
> > octy dcty dist d1 exp x1 x2
> > a c 5 1 50 35 50
> > a d 4 0 100 35 50
> > b c 3 0 50 29.167 0
> > b d 8 0 100 29.167 0
> > c d 2 1 50 25 50
> > d c 2 1 100 50 100
> > e c 1 0 50 150 0
> > e d 1 0 100 150 0
> >
> > I need to generate x1 and x2 for all countries based
on
> >the following formula:
> >
> > x1 (country a)=
>
1/dist(a,c)*exp(c)+1/dist(a,d)*exp(d)=1/5*50+1/4*100=35.
> >
> > x2 (country a)=
> >d1(a,c)*exp(c)+d1(a,d)*exp(d)=1*50+0*100=50, and so
on
> >for all countries.
> >
> > With over 200 countries, this obviously needs some
> >programming and it would be great to get some help
here.
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