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st: Resetting the local in a nested loop


From   Michael Stuetzer <michael.stuetzer@qut.edu.au>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Resetting the local in a nested loop
Date   Wed, 19 Aug 2009 19:08:34 +1000

Dear Stata lister,

I have a small problem with a nested loop and maybe you can give me an advice. For a specific business starting activity I have data for the beginning (BUSINESSPLAN_SP[odd]) and the end (BUSINESSPLAN_SP[even]) of this activity. For instance the entrepreneur worked on the business plan in the months 4 till  7 as well as 16 till 25. I want to transfer the information into a time grid. In this grid t1, t2, etc. stands for the respective month. They should take the value of 1 if the entrepreneur worked on the business plan on the point of time. I have here a first draft of the loop.


set more off
local r=5
forvalues i=1/100 {
	local j=1
	local k=`j'+1
	while `j'<=`r' { 
		replace t`i' = 1 BUSINESSPLAN_SP`j'<=`i' & BUSINESSPLAN_SP`k'>=`i'
		local j=`j'+1
		}
	}

The problem is that this loop recognizes the first sequence (4 to 7), but not the second sequence (16 to 25). I suspect something is wrong with the resetting of the local j (local j=`j'+1) and k.

Thanks for your help
Michael


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