In addition to Richard's good advice:
program define growth
forval i = 1999/2004 {
local j = `i' + 1
gen gro`j' = (y_`j'-y_`i') / y_`i'
}
end
or
program define growth
forval i = 1999/2004 {
gen gro`=`i'+1' = (y_`=`i'+1'-y_`i') / y_`i'
}
end
Nick
[email protected]
Richard Williams
> At 09:43 AM 6/21/2005 -0400, Seyda G Wentworth wrote:
> >Hello,
> >I have a long list of exported goods and their annual values
> (y_1999;
> >y_2000; y_2001...). I want to compute the growth rate for
> each of these
> >products between 1999-2000 called gro2000; between 2000-2001 called
> >gro2001; and so on till 2003-2004. So I need to create 5
> variables. I'm
> >trying to write a simple program of the following sort:
> >
> >program define growth
> >local i=1999
> >while (`i'<=2004) {
> >gen gro`i'+1=(y_`i'+1-y_`i')/y_`i'
> >local i=`i'+1
> >}
> >end
>
> Instead of all the `i'+1, after the while command insert
>
> local j = `i' + 1
>
> and then use `j' instead of `i' + 1
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