This changes your data and assumes no
gaps. Using -tsset- and F. is a
better way to do it.
Nick
[email protected]
Jeph Herrin
> Try
>
> gen profits1=profits
> bys firms (years): gen profits2=profits[_n+1]
> bys firms (years): gen profits3=profits[_n+2]
> drop if profit2==.
irodriguez
> > 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
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