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# st: AW: AW: Regressions with constant independent variable

 From Fabian Schönenberger To Subject st: AW: AW: Regressions with constant independent variable Date Wed, 11 Apr 2012 11:45:50 +0200

```Many thanks! I have used:
By cusip (fyear), sort: generate firstlnsales=lnsales[1] if (lnebit [1]
!=0). This one works fine.
However, I would like to adjust the formula, in order to get observation 2
if lnebit [1] is 0, and then observation 3 if observation 2 is 0 and so on.
Any suggestions?

Best, Fabian

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Dithmer, Jan
Gesendet: Mittwoch, 11. April 2012 10:49
An: statalist@hsphsun2.harvard.edu
Betreff: st: AW: Regressions with constant independent variable

If you want to create a new variable, s.th like the following may work (if I
understand you correctly):

by cusip: gen salesinitial = sales if fyear=="first observation of fyear"
by cusip: replace salesinitial = salesinitial[_n-1] if salesinitial==.

It may be possible to do it in one step, but unfortunately I don't know how
and would also be interested in a shorter solution.

Best, Jan

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Fabian
Schönenberger
Gesendet: Wednesday, April 11, 2012 8:55 AM
An: statalist@hsphsun2.harvard.edu
Betreff: st: Regressions with constant independent variable

Dear Statalist
I would like to run a regression like Y=a + b*x + c*z + e for panel data. ID
is cusip, and t is fyear, x is sales and z is growth of sales.
I would like to keep x fixed for each cusip at the level of the first
observation of fyear.
Do I need to create a new variable or can I adjust my regression formula?

FS

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