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Re: st: Coefficients resulting from Cross-Sectional Regressions


From   David Hoaglin <dchoaglin@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Coefficients resulting from Cross-Sectional Regressions
Date   Fri, 6 Apr 2012 16:37:21 -0400

Fabian,

I think several of us are trying to understand how many observations
your data have within an individual year for an individual firm.  That
is, for firm id in year t, how many observations do you have, and what
is varying to produce them?   Your notation yid,t suggests that you
have only one observation per combination of firm and year.  If that
is correct, the data would not support a model in which the
coefficient is bid,t.  The data might, however, support a model in
which the coefficient is bid.  Such a model could also contain effects
for the years, either common to all firms or common to all firms
within a particular industry.

David Hoaglin

2012/4/6 Fabian Schönenberger <fabian.schoenenberger@gmail.com>:
> I do not have the same number of yearly observations for each firm.
> According to other studies from journals this is true for many empirical
> investigations.

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