Hi all, I think I've found a bug in the gap_filler() function which is part of the extra package. This happens on current git using Ubuntu. Best, Artur <hansl> # extra_sample.inp # Sample script for the extra.gfn package include extra.gfn --force set verbose off open denmark.gdt -q # WORKS: NA somewhere in the middle of the dataset series play = LRM play[10] = NA # insert missing series playout = gap_filler(play, 2) print playout # DOESN'T WORK: Insert missing in last obs when play has a NA at the last entry play[$nobs] = NA # insert missing play series playout = gap_filler(play, 1) print playout # DOESN'T WORK: Insert missing in last obs when play has a NA at the last entry play[$nobs] = NA # insert missing play series playout = gap_filler(play, 2) print playout </hansl>