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st: spell variable according to a criteria

From   Abhimanyu Arora <>
Subject   st: spell variable according to a criteria
Date   Wed, 4 Apr 2012 17:40:02 +0200

Dear statalist

I have a (monthly) time indicator and a variable 'stretch'  that
identifies the spell of an event. I need to create a dummy in case the
event took place or not.
Currently event=1 for the start of the event (an missing for the
rest). If stretch==1, event should equal 1 for the next time period.
If stretch =2 event=1 for 2 more time periods (besides the starting

I know that stretch ranges from 1 to 18 (but may not have the values
in between).

When I try without using the following loop (putting in the numbers
manually that is), it seems OK, But with the following loop things
aren't quite right.

local i=0
while `i'< 18 {
bys panel_identifier:replace event=1 if  stretch[_n-(`i'+1)]>`i' &
stretch[_n-(`i'+1)]!=. & event==.
sort panel_id time
local ++i

Where does the mistake lie?
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