Dear Gretl Developers, I'm getting an error message when I try to run that script using the latest snapshot: <hansl> clear nulldata 200 setobs 12 2000:01 --time-series string data_1o_lim_sup = "2010:02" string data_2o_lim_sup = "2013:7" scalar n_exec = @data_2o_lim_sup - @data_1o_lim_sup + 1 </hansl> The message is: "Data types not conformable for operation". I'm a little bit confused because the same script works with Gretl 1.9.11cvs (build date: 2013-01-08). Best regards, Henrique Andrade Enviado via iPhone