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Re: st: Fwd: Creating date variables using loops


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Fwd: Creating date variables using loops
Date   Thu, 4 Oct 2012 12:29:28 +0200

On Thu, Oct 4, 2012 at 12:18 PM, Lars Folkestad wrote:
> I have a dataset containing id startdate stopdate but want to create 1 variable for every day inbetween. The duration is not the same per id.
>
> I thought that since i increase by one unit (=1day) each time it would be easily done using a loop.

No loops necessary:

*---------- begin example ----------
clear all
input id start end
1 19279 19286
2 19278 19281
end
format start end %td
list

gen n = end - start + 1
expand n
bys id : gen date = start + _n - 1
format date %td
list, sepby(id)
*----------- end example -----------
(For more on examples I sent to the Statalist see:
 http://www.maartenbuis.nl/example_faq )

Hope this helps,
Maarten

---------------------------------
Maarten L. Buis
WZB
Reichpietschufer 50
10785 Berlin
Germany

http://www.maartenbuis.nl
---------------------------------
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