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st: Sample size

From   Fabio Zona <>
Subject   st: Sample size
Date   Sat, 15 May 2010 16:11:48 +0200 (CEST)

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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