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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