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st: generate Spell Counter or Duration Variable


From   David Ashcraft <ashcraftd@rocketmail.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: generate Spell Counter or Duration Variable
Date   Fri, 7 Dec 2012 08:52:14 -0800 (PST)

Hi Statalist,

I wanted to generate a duration variable to determine, how long a firm remained in a specific state. the dataset is panel where T>N. The change in state of the firm is explained by a dummy variable. The duration variable as shown below capture duration of each spell. I thought of using -xi i.d- but it generate the same variable as -d-. 

iddate2dDuration
11658711
11661712
11664613
11667900
11670911
11674000
11677011
11680000
11683211
11686000
11689111

Any help will be highly appreciated.
Regards

David

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