On Tue, 21 Dec 2010, Sven Schreiber wrote: > I just tried to do NLS w/o initializing the parameters -- the error > message was not informative ("wrong data type"). If I use "catch", I get > an even stranger message: "no regression function is given". Sample script, please. I've tried modifying/breaking the file ects_nls.inp, supplied with gretl, in two different ways: * Remove the definition of the parameter "alpha" altogether -- Error message: The symbol 'alpha' is undefined * Give a bare declaration of alpha, no initialization -- Error message: Data error