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st: query about the F test

From   "Tumur Gunchinmaa" <[email protected]>
To   [email protected]
Subject   st: query about the F test
Date   Thu, 20 Jan 2005 12:49:00 -0000

Dear Members, My question is, I ran 2 OLS
regression(below) both having the same number of
observations(19) however one does not have the F test,
instead is a dot.
Regressions were
reg y x1 x2 if z==1
reg y x1 x2 if z==2
What does the dot imply?
Thank you.

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