A heads-up: the mrw.gdt datafile that's packaged with gretl has been modified slightly. The series that was named "inv" (investment to GDP ratio) has been renamed as "i_y". This avoids a collision with the name of the inv() function (matrix inversion) which up till now has produced a somewhat annoying warning message. The revised version of mrw.gdt is now in gretl snapshots, and will be in the next (2024b) release. The gretl example scripts that use this dataset have been updated accordingly. Allin Cottrell