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st: AW: Sample size


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Sample size
Date   Sat, 15 May 2010 16:19:51 +0200

<> 

" How can I figure out the minimum sample size per each subgroup required to run correct regression (OLS)?"


How is a "correct regression" defined theoretically? Stata does have commands like -h sampsi-, but apparently you are looking for something else?



HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Fabio Zona
Gesendet: Samstag, 15. Mai 2010 16:12
An: statalist@hsphsun2.harvard.edu
Betreff: st: Sample size

Dear Statalist

I have a sample of about 193 corporations; this sample is composed by:

- a subgroup of 139 corporations (subgroup A)
- a subgroup of 54 corporations (subgroup B), identified by a dummy SUBG

I run interactions (i.e., the dummy SUBG x indep var); I also run a chow test.

Do you think that 54 companies in the interacting subsample are not enough? How can I figure out the minimum sample size per each subgroup required to run correct regression (OLS)?

Thank you


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