[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]
st: RE: -tsset- difficulties (was Re: dwstat v dwstat2)
You've lost me here. I've looked through my
posts of 2 June and I can't see any posting of
mine on this topic. Also, I have no idea what
-paneldate- is: -search- and -findit-
There's perhaps some very simple underlying
all this, or something rather odd, or both.
As others are interested in similar issues,
I'll underline a fundamental.
If you have panel data, say
. tsset id year
and also therefore (usually) repeated times,
Stata cannot make head or tail of
. tsset year
One reason enough for that is that
with ties on year there is no
unique sort order on -year- and
no way to interpret time series
operators such as L. without
There are circumstances in which
one wants it both ways. In
one problem Chris Wallace posed a while back
on atmospheric pressures, pretending
that separate days were separate
panels meant that, as desired,
various calculations were performed
only within days. For other problems,
treating the complete time series
as such would be essential. Here
a panel is a device created
for a purpose.
My impression is that this is fairly
rare, however. If you have panel
data in the more standard sense,
in which panels are distinct individuals,
firms, areas, etc.,
trying to get Stata commands to pool the
data for separate panels and give you
some kind of composite or aggregate model
fit or test will often be ill advised,
impossible or both, as Kit Baum
has argued trenchantly.
This may well leave Clive's problem
untouched, but I can't discern from
below either what he wants or
anything about his dataset which
would be problematic. I don't believe
that changing the display format could
or would have any effect over
and above a previous -tsset-.
> I'd like to echo the posts of others of my own difficulty in
> being able to
> -tsset- my year variable in my own datasets.
> I've tried everything possible, including:
> * Nick Cox's -paneldate- suggestion in a post in 2/6 (which
> I'm unfortunately
> not in position to recreate here, as it involves several
> steps, but if I
> recall generated the same year for each observation!); and
> * using -gen = _n- after -bysort- (which doesn't give me what
> I want); and
> * using -gen, year()- or -yearly()-.
> After -format-ting my year variables into the %(4)ty storage
> type, Stata still
> refuses to -tsset- year: I still get the same "repeated time
> values in sample"
> r(451) error. Cracking this would be a major help. Thanks!
* For searches and help try: