Re: [Gretl-users] One-sided HP filter
Am 08.03.2018 um 16:19 schrieb Riccardo (Jack) Lucchetti:
However, I'd like to ask the community a question: how should we
use
this: I have three possibilities:
...
* implement this as a variant of our native hpfilt() function, with
an
extra boolean flag for one-sidedness.
This one makes the most sense IMHO.
(Additional remark: hpfilt already has another optional scalar
parameter. If I understand correctly, if a built-in function has an
optional string parameter, then in the next gretl release it would be
possible to skip the numerical optional arguments. So if the one-sided
option is implemented as a string, it would be possible to write
something like hpfilt(y, "1side"). Don't know if that convenience is
enough to replace a plain boolean 0-1 argument...)
thanks,
sven