On Wed, 30 Jun 2010, Sven Schreiber wrote:
Am 29.06.2010 21:29, schrieb Allin Cottrell:
> In a panel dataset in the form of stacked time-series (which is
> the representation gretl uses) you can sample in mode (a) by
> choosing a contiguous subset of individuals or units, but sampling
> by time period necessarily involves mode (b): we have to carve the
> dataset up; it's a --restrict operation. The syntax you're
> suggesting in effect "dresses up" a --restrict as if it were a
> simple moving of end points. But we can't make this sort of
> sampling behave in that way and I suspect it will end in tears.
As you say, the internal representation of the data is the key driver
here. But the user doesn't care about that, that's my point...
Granted, yes. I agree it would be nice to emulate the use of smpl
for time-series data in the time dimension of panel data, if
it can be done at reasonable cost.