TRAMO may be applied to annual data, for example, if one wish to detect
outliers. But the gretl plugin only allow to pass TRAMO to seasonal series.
This feature was changed in gretl 1.2.9 (see changelog), but it seems that a
gremlin has been disabled it again. ¿?
Dpto. de Economía Aplicada III (Econometría y Estadística)