Re: [Gretl-devel] gretl bug: ordered probit model

On Mon, 9 Oct 2017, Allin Cottrell wrote: > On Mon, 9 Oct 2017, Riccardo (Jack) Lucchetti wrote: > >> However, I was thinking: can lagging the constant ever make sense, >> in any situation? Shouldn't const(-1) be a no-op? > > I suppose it could be used as a tricksy way of getting a series > that's all 1s apart from NA at observation 1. We could ban the > operation but I'm not sure that would be worthwhile. Looking further into this, I see that we already flagged an error if "const" was passed to the lags() function -- but, inconsistently, we accepted it in simple form such as "const(-1)". So now I've made it an error in either case, with a new error message, "The constant cannot be lagged". I think that's right, it's a nonsensical operation. Allin