Re: [Gretl-devel] weekdays (was Re: [Gretl-users] problems with daily data)
Am 23.05.2014 18:23, schrieb Allin Cottrell:
On Fri, 23 May 2014, Sven Schreiber wrote:
Anyway, there are a couple of new things in CVS that should be helpful.
1) If the current dataset is 7-day or 6-day daily and you apply a
restriction via "smpl", we check to see whether the restricted dataset is
still "OK" as 6- or 5-day data. If so, we re-establish its time-series
credentials.
Nice. Does it affect the "official" periodicity of the workfile ($pd for
example)? And could I pester you again about displaying the variant of
daily periodicity at the bottom of the main window where it now just
says "daily".
2) I've added something Jack suggested: a --permanent option to "smpl",
which substitutes the restricted dataset for the original. This will need
some testing. Right now it's not available in the context of just moving
the sample end-points: it's valid only in association with the options
--restrict, --dummy, --no-missing or --random.
If I understand correctly, this helps to apply several sample
restrictions and then remove a subset of those easily by doing 'smpl
--full'. Certainly useful.
Along with the generalization of weekday() this means that you can discard
empty weekends to get a 5-day dataset in two lines of hansl.
<hansl>
open <seven-day-data>
series wd = weekday($obsmajor,$obsminor,$obsmicro)
smpl wd >= 1 && wd <= 5 --restrict --permanent
</hansl>
Strictly speaking the --permanent option is not necessary here, right?
And an OT follow-up about the non-weekend holidays: How should they be
treated? Econometrically I guess in many applications you just remove
and ignore them like the weekends. But workfile-wise? If they are
removed, we lose the time-series property of the workfile (apart from
the clunky workaround without date information). If I keep them I don't
have a contiguous time series anymore.
Maybe I should check how Eviews does it to get some inspiration...
cheers,
sven