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RE: st: control a variable in stata


From   "Kong, Chun" <C.Y.Kong@warwick.ac.uk>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   RE: st: control a variable in stata
Date   Sat, 21 Apr 2012 23:06:36 +0000

by the way, the R2 did improve after I have added 'age' and 'race' into my regression. Thank you very much for your advice!!
________________________________________
From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] on behalf of Nora Reich [nhmreich@googlemail.com]
Sent: 21 April 2012 20:38
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: control a variable in stata

Andy, by the way, what is the value of the R2? It gives you a hint on
how much of the variation in salary can be explained by your model. I
would improve the model with new variables (as proposed earlier) and
see which ones have a significant effect and which ones lead to
substantial increases in R2.

Nora



Am 21. April 2012 21:33 schrieb Nora Reich <nhmreich@googlemail.com>:
> As far as I know, -poisson- is for skewed distributions, and salary
> distribution in general often fulfills this requirement, but salary of
> NBA players might show a different distribution. The distribution can
> be checked, e.g. with the command
>
> -histogram salary-
>
> (for more information type -help histogram-).
>
> Andy, I would compare the assumptions and requirements of different
> estimation strategies (OLS, poisson) and find out which fits better
> with the data.
>
> I would also check which estimations strategies are used by similar
> papers, and why.
>
> Apart from -poisson- and -regress-, I cannot think of any at the
> moment that have to be considered for your salary-estimations.
> However, if there was something like a "minimum wage" for NBA players,
> i.e. salary is censored,  -tobit- would be an alternative.
>
> Best regards
> Nora
>
>
>
>
> --
> Nora Reich
> www.nora-reich.de
> Publications:
> http://www.nora-reich.de/publikationen.html
> http://www.hwwi.org/ueber-uns/team/forscher/nora-reich/publications.html



--
Nora Reich
www.nora-reich.de
Publications:
http://www.nora-reich.de/publikationen.html
http://www.hwwi.org/ueber-uns/team/forscher/nora-reich/publications.html

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