Folks, I'm estimating a series of regressions with varying break dates. I set up a script with the break dates in a vector, then generate a post-break dummy variable inside a loop, like so: <script> matrix breaks = breaks = {1985; 1985; 1986; 1986; 1982; ...} loop ii=4..29 post = (obs>=obsnum(breaks[$ii-3])) (run regression, do other stuff) end loop </script> This worked in an earlier version of gretl (I wrote it a year or so ago), but now the "post" series returns all NA's. I've tried forcing breaks[$ii-3] to be an integer, but no change. I've played around a bit in the console window, and things work fine if I use "post = (obs>=obsnum(1985))," but not otherwise. For example, trying tmp = breaks[$ii-3] post = (obs>=obsnum(tmp)) doesn't work either. Any thoughts? TIA, PS =============================== Dr. Peter Summers Assistant Professor Department of Economics Texas Tech University ===============================