Hello everybody;
Nowadays the fractional methods are more and more used, and as Gretl has
implemented the ADF and ADF-GLS tests, I think it would be very interesting
to complement them with the fractional version of the Dickey Fuller test
(Dolado, Gonzalo and Mayoral -Econometrica, 2002 & Studies in Nonlinear
Studies and Econometrics 2008-; and Lobato and Velasco -Econometrica,
2007-). Have anybody programed it? I have some routines, but there are in R
and they are quite "rudimentary". Hovewer, if you are interested in this
test I could pass you my routines so as you can review and implement if you
want.
Cheers
Javi