On Tue, 24 Sep 2013, cociuba mihai wrote: Thanks. That error message is quite obscure and I've now fixed it up in CVS, so that (in this case) it reads: "Expected numeric data, found string: 'n.s.' at row 202, column 2" The problem is just that. I suppose that "n.s." may be meant to indicate a missing value, but it is not one of the strings that gretl recognizes for that purpose. For reference, gretl takes the following to indicate "missing": an empty cell, a cell containing an empty string, "NA", "N.A.", "n.a.", "na", "N/A", "#N/A", "NaN", ".NaN", ".", ".." Allin Cottrell