Re: [Gretl-devel] no asymmetry in the new "band" plotting option?
On Wed, 3 Aug 2016, Sven Schreiber wrote:
I've just re-read or read more carefully the earlier posts about
the new band plotting feature.
They all seem to talk about a center/width combination to be
passed to gretl. This would imply that the bands are restricted to
be symmetric -- OK, I admit that you could reverse-engineer fake
"center" and "width" values if you have the lower and upper bounds
of the band in the first place.
But (confidence) bands are not symmetric in general. So I would
vote for the possibility to specify arbitrary center/low/high
triplets instead. Or am I missing something with this new feature?
No, I don't think you're missing anything. We're taking the
symmetric case as paradigmatic, and hoping that it's easier for
experts to "reverse-engineer" this, as you say, than for ordinary
users to bother with expanding the symmetric case to lower and
upper.
That said, the new syntax is designed to be extensible, though it's
not actually extended yet!
Allin