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st: message (V_b-V_B is not positive definite) in hausman test

From	Christine Lee <[email protected]>
To	[email protected]
Subject	st: message (V_b-V_B is not positive definite) in hausman test
Date	Fri, 1 Jul 2005 12:32:16 +0100

Hi

I ran a hausman test between fixed and random effects models and got the
message   (V_b-V_B is not positive definite) at the end of the estimation.

Has anyone got a clue what this is and ways of resolving this?

Thanks
Christine Lee

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