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Re: st: superposed rolled windows


From   Jeph Herrin <jherrin@flyingbuttress.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: superposed rolled windows
Date   Tue, 27 Jun 2006 11:00:59 -0400

Never mind, I figured out "F".  Funny that it isn't even
mentioned on the time series functions page.



Jeph Herrin wrote:
According to his original post, he wanted to change
his data. But the point about the gaps is well taken.

what is "F."? other than the F density.



Nick Cox wrote:
This changes your data and assumes no gaps. Using -tsset- and F. is a
better way to do it.
Nick n.j.cox@durham.ac.uk
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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