My best guess is that R is choking on some garbage white space
(non-breaking spaces or some such?) which may, perhaps, be an
artifact of copying and pasting from an evil email client into the
gretl script editor.
You are right, it was Kmail's copying-pasting
I see two "funny symbols" before "summary(mod1)".
Try typing the commands into gretl.
It works perfectly.
--
Ignacio Diaz-Emparanza
DEPARTAMENTO DE ECONOMÍA APLICADA III (ECONOMETRÍA Y ESTADÍSTICA)
UPV/EHU
Avda. Lehendakari Aguirre, 83 | 48015 BILBAO
T.: +34 946013732 | F.: +34 946013754
www.et.bs.ehu.es