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st: F test gives me a missing value


From   "Sara Pinoli" <pin_sara@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: F test gives me a missing value
Date   Thu, 15 Sep 2005 10:26:47 +0000

I'm running a series if simple linear regressions (with FE) on different subsamples. Sometimes I obtain the usual table of results, but sometimes the value displayed for the test statistic F is: .
What does it mean?


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