Am 24.01.2009 17:11, Riccardo (Jack) Lucchetti schrieb:
On Sat, 24 Jan 2009, Riccardo (Jack) Lucchetti wrote:
> On Sat, 24 Jan 2009, Olle Olsson wrote:
>
>> Hey all, ' I'm trying to master Johansen's test for cointegration,
>> but I am a bit puzzled. When I ran a bivariate Johansen test on some
>> data I'm working on, the result was:
>
> ...
>
> If in a system with n variables the cointegration rank is r, than all
> the variables are stationary. See section 21.2 of the gretl manual.
Doh! I meant:
If in a system with n variables the cointegration rank is *n*, than all
the variables are stationary.
right, which apparently clashes with the unit-root pretests. I can think
of at least two reasons for that: First, contradictory statistical
evidence simply can happen. Second, maybe there is some subtle (or not
so subtle) difference with respect to the specification of deterministic
terms in the various tests.
-sven