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st: Syntax Question/ Cross-sectional Characteristic of a panel data


From   "ALICE DOBSON" <alice_dobson@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Syntax Question/ Cross-sectional Characteristic of a panel data
Date   Fri, 27 Jan 2006 14:36:15 -0500

Hi all,
I have an unbalanced panel of firms for a period of 15 years, 1972-1986. One of the variables is Age of the firm. The maximum age of any firm is 15 years. Hence, all firms are born during or after 1972. I want to compute the time of entry of each firm, which will be one value for a particular firmid.

Firmid Year Age Timeofentry
0001 1983 6 7
0001 1984 7
0001 1985 8
0001 1986 9
0002 1984 13 1
0002 1985 14
0002 1986 15


For instance, the age of firmid 0001 during the year 1983 [when it first appears in the data] is 6 years. I therfore compute its timeofentry as 7 since it entered in 1978. Similarly, the age of firmid 0002 firmid during 1984 [when it first appears in the data] was 13 and hence I compute its time of entry as 1.

I would like to compute the timeofentry of all firms in the unbalanced panel. Could anyone please help me with the syntax?

Best,
Alice

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