I encountered a strange behaviour when trying to compact a time-series dataset. I have a monthly dataset from 1837:12 to 2008:12. When I compact the dataset to annual using the GUI (and selecting the 'last' method) everything works well, except that the last annual observation turns out to be 2007 instead of 2008. I'm using Gretl 1.9.3 and have encountered this behaviour both on Mac OS and on Windows XP. When I add a dummy obs for 2009:01 and then compact, the last observation is indeed 2008 in the annual dataset. So, I'm not stuck but I was wondering whether the compacting behaviour is working as intended or whether it is a small bug. Jan Annaert