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st: RE: Re: Variable generation


From   "Nick Cox" <[email protected]>
To   <[email protected]>
Subject   st: RE: Re: Variable generation
Date   Thu, 14 Jun 2007 19:51:14 +0100

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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