On Tue, 27 Jul 2010, Irwin, James R wrote:
 Hello. Is the Phillips-Perron test for a unit root available in
Gretl? 
No, ADF and KPSS but not Phillips-Perron.
 Or is using R still the best option? (as described in the Tue Dec
15,
 [Gretl-users] "Perron test for unit roots in GRETL") 
Probably, yes.
Allin Cottrell