Re: [Gretl-devel] bandwidth default for nadarwat()

Am 14.06.2018 um 07:17 schrieb Riccardo (Jack) Lucchetti: > On Wed, 13 Jun 2018, Sven Schreiber wrote: > >> I don't see why we need to rename and deprecate the nadarwat function to >> achieve what you want. In the old version the user always has to give y, x >> and h (bandwidth). Plus in the background there is the nadarwat_trim >> setting (default 4). >> >> So if we extend the function as you say, then only two things need to be >> done internally if the function is called with only the first three args: >> 1) Check whether bandwidth is negative. If so, set leave_one_out to 1 and >> bandwidth to abs(bandwidth). >> 2) Check whether the nadarwat_trim value is != 4. If so, set the trim arg >> to that value. > > My concern is: how do you get automatic bandwidth selection and the > leave-one-out option together? I guess that, in your scheme, you could > leave the third argument empty and set the fourth one to 1, but it looks > sort of awkward to me. Anyway, it's a possibility. Jack, please reformulate your proposal in strict hansl. Because you wrote: function series nadwat(seties y, series x, scalar bandwidth[auto],     bool leave_one_out[0], scalar trim[4]) but there is no such thing as an "auto" default value in hansl AFAIK,

and also you put the default for leave_one_out to 0 whereas verbally it sounds as if you want to have 1. So this is confusing.