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st: Data manipulation - time between value changes of a categorical variable


From   Iulian Ihnatov <iulian.ihnatov@uaic.ro>
To   statalist@hsphsun2.harvard.edu
Subject   st: Data manipulation - time between value changes of a categorical variable
Date   Sun, 25 Sep 2011 23:12:52 +0300

Dear Statalister,
In have a panel dataset of 200 countries/10 years, and the "regime" variable (categorical - 8 values).
The questions are:
1. by country: calculate the lenght (years) of each regime before the switch; 2. tabulate (and, if possible, plot - 3D?) the frequency for each lenght and regime.

The second task is reacheable with the tabulate, table or, better, tabout commands (not sure about the graph).
Would you be so kind to give me some idea of how to solve the first task?


Regards,
Iulian Ihnatov
-Stata 10-


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