st: F test gives me a missing value

From	"Sara Pinoli" <[email protected]>
To	[email protected]
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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Follow-Ups:
- st: Re: F test gives me a missing value
  - From: "R.E. De Hoyos" <[email protected]>