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Re: st: AW: panel data analysis

From   Neil Shephard <>
Subject   Re: st: AW: panel data analysis
Date   Tue, 15 Jun 2010 13:20:09 +0000

>> -----Ursprüngliche Nachricht-----
>> Von:
>> [] Im Auftrag von Danielle
>> Koopmans
>> Gesendet: Dienstag, 15. Juni 2010 12:41
>> An:
>> Betreff: st: panel data analysis
>> Hello,
>> it's my first time here and I have some questions. I have a dataset
>> with variables of 32 firms over a timespan of 10 years, I am examing
>> whether tenure (of a specific person) and other variables has
>> influence on the profitability (y) of firm i.
>> First I have a question about the xi command because I have some
>> categorical variables: I wanted to create dummies for the variable
>> years xi i . years and for education xi i . education, I tried this
>> command but nothing happenend, not even a note that I did something
>> wrong.

Unless you have a specific reason to there is no need to generate
dummy variables, you can instead list them as factor variables when
specifying your models.  Stata will generate dummy variables in the
background.  See -man factor variables- for more information.


"... no scientific worker has a fixed level of significance at which
from year to year, and in all circumstances, he rejects hypotheses; he
rather gives his mind to each particular case in the light of his
evidence and his ideas." - Sir Ronald A. Fisher (1956)

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