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st: about 'forvalues' loop


From   Marwan Elkhoury <elkhoury.marwan@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: about 'forvalues' loop
Date   Tue, 8 Sep 2009 13:29:53 +0200

dear statalist,

sorry again to bother you with some very stupid question but I'm getting stuck again on some simple matter that I believe is in the writing of scalar.

the story is that I have a panel data and I'ld like to generate a new variable called kstck (by country (cy)).

so I run this loop:

bysort cy: gen kstck = 0
reshape wide gdp gfc kstck, i(cy) j(yr)

* Calculate capital stock from 1990 to 2000 using the following formula (where gfc* is the investment in year *)

bysort cy: replace kstck1990 = gfc1990

forvalues i = 1991/2000 {
bysort cy: replace kstck`i' = .93*kstck`i-1' + gfc`i'
}

However, it is not giving me the required result of the recursive summation. why ?

any advice would be most welcome.

and many thanks in advance.

Marwan
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