[Gretl-devel] the "add" and "omit" commands

In the course of working on the bug reported by Ignacio I took a look at some other aspects of add and omit. These commands have a long history, and from the beginning they have had a dual aspect: they run a test but also "return" a new model, which becomes the current model in place of the model being tested. I don't think I'd make them that way if I were writing them today, but anyway... A relatively recent addition is the --wald option, in which case the current model is not replaced. In addition, there has been undocumented behavior whereby if you give the --quiet option the current model is not replaced. This seems to me unruly, and in CVS I've modified add and omit thus: * The --quiet flag infuences the printout only, and has no effect on whether or not the current model is replaced. * A new --test-only option can be used to prevent replacement of the current model. This can be applied for all variants of "omit", although it's already implicit in the --wald option. Does this seem OK? And one more thing: with a regular "omit", without the --quiet flag, the full estimation results for the reduced model are printed first, then the test. This can confuse the unwary (e.g. my students), because the first F-test they see in the output is the "overall" F-test for the reduced model, not the "omit" test itself. To get around this I've modified the model printout so that it does the equivalent of --simple-print, leaving off the auxiliary statistics including the overall F-test. (If you save the model in the GUI and then view it in its own right, you get the full printout as usual.) Again, does this seem OK? Allin