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st: Panel data sorting

From   "Bradley, Steven W" <>
To   <>
Subject   st: Panel data sorting
Date   Fri, 19 Aug 2005 00:21:03 -0500

I have a large company data base in which I have the following 
variables among others:  Company ID (ID), Age (age), Year (Year).  

I have data from 1992-2002 and would like to keep a cohort of data for 
companies that were started in 1994.  Therefore, I generated a new 
variable that combines Age and Year (ageyear) to identify those 
companies started in that year.  However,I cannot seem to devise a way 
to keep data for those companies for subsequent years. Any help would 
be appreciated!


Steve Bradley
Indiana University

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