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Re: st: superposed rolled windows


From   "irodriguez" <irodriguez@utdt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: superposed rolled windows
Date   Tue, 27 Jun 2006 11:30:46 -0300

But i dont want all the observations
for example if a firm has observations for 1990-2004 the new database will 
have observations for 1990-2002. In the same way for a firm with data for 
1990-1995 will have observations for 1990-1993
Thanks

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

> 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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