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st: query about the F test


From   Gunchinmaa Tumur <[email protected]>
To   [email protected]
Subject   st: query about the F test
Date   Wed, 19 Jan 2005 16:40:08 -0800 (PST)

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.

 Regards,
 Gunche




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