Am 07.04.2017 um 16:05 schrieb Allin Cottrell:
On Wed, 5 Apr 2017, Sven Schreiber wrote:
> I think it's time to ditch the entry "Hausman test matrix is not
> positive definite (this result may be treated as\n
> \"fail to reject\" the random effects specification).\n"
>
> Although I have a 'classic' paper named "The Hausman test statistic
> can be negative even asymptotically" which shows that that would
> happen only if H0 is wrong, I have tolerated the existence of that
> entry until now.
> But for quite some time gretl also has had an alternative
> regression-based Hausman test for Random Effects where the problem
> cannot happen. So why do we still need this misleading gretl message?
The matrix-diff method for the Hausman test is still an option (for
comparability with other software). But OK, we can trash the
parenthetical clause in the above entry.
Thank you! Or the parentheses might be changed to "(estimate without the
--matrix-diff option to get a valid test)".
cheers,
sven