Hi, I noticed that Gretl doesn't complain if I wrongly write: set csv_read_na = "." Instead (as 'set' shows) it just uses the "=" character and ignores the rest of the line, with fatal (but predictable) implications e.g. for 'join'. Maybe it should throw an error if it is getting an unquoted string, or if it is getting something unexpected at the end. Furthermore, if I write set csv_read_na "." (i.e. without the equal sign), it takes literally the three-character thing \".\" (quote dot quote) instead of just the dot. So quoted strings seem taboo here, which I find slightly worrying (and took me a while to figure out the error). cheers, sven