hausman test

[uldooz ghorbani]

Hi, When we do hausman test if it's prob equal a negative value, what do we do? and why do this happened? Thank's

[Carlo Lazzaro]

Uldooz:
this happens quite frequently.
For more on this topic, take a look at : http://www.stata.com/statalist/archi.../msg00599.html.
-sigmamore- or -sigmaless- options available with -hausman. might be helpful.
For te future, please provide the list with what you typed and what Stata gave you back (as per FAQ#12). Thanks.

[uldooz ghorbani]

Thank's for your help.