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Re: st: superposed rolled windows


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: superposed rolled windows
Date   Tue, 27 Jun 2006 10:17:23 -0400

Try

 gen profits1=profits
 bys firms (years): gen profits2=profits[_n+1]
 bys firms (years): gen profits3=profits[_n+2]
 drop if profit2==.

HTH,
Jeph


irodriguez wrote:
statalisters
i need to generate some columns data in excel I think I could calculate them in stata
I have a panel data with firms, and profits for the period 1990/2004 No all the firms have the same period of data
I need to calculate others 4 columns for profit
superposing a rolling period window of 3 periods.
Example:
original data base
Firms Years Profits firm 1 1990 7
firm 1 1991 9
firm 1 1992 2
firm 1 1993 6
firm 1 1994 5 firm 1 1995 4
firm 2 1990 3
firm 2 1991 2
firm 2 1992 1
firm 2 1993 3
...
New data base
Firms Years Profits1 Profit2 Profit3 firm 1 1990 7 9 2
firm 1 1991 9 2 6
firm 1 1992 2 6 5
firm 1 1993 6 5 4
firm 2 1990 3 2 1
firm 2 1991 2 1 3
How can I do it
Thanks
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