Re: [Gretl-users] sub-sampling panel data
Allin,
I'm not sure I understand...
Allin Cottrell schrieb:
3) However, the requirement at point 2 is in a sense "formal":
some of the time-series observations may be composed of NA
(missing) values.
ok, so it's not really a balanced panel then in the usual sense of the
term, right?
4) Therefore, when a user sub-samples in a way that would
"naturally" destroy the panel structure of the data, we offer the
"--balanced" option as a means of reconstituting the panel
structure. This necessarily involves "padding" the observations
for least some of the cross-sectional units with missing values.
so that sounds to me like --balanced doesn't really give you a balanced
panel, it "just" sets equal matrix dimensions. I would have expected
that --balanced does something like finding the least common denominator
(wich may involve discarding lots of observations of course). But I
admit I haven't read the documentation... feel free to tell me that I
should do that first.
cheers,
sven