Arem,
I'll have a go at answering a couple of your questions...
Quoting [email protected]:
> Dear all,
>
> I have a balanced panel data. I used xtgls with heteroscedasticity
> and psar1
> options specifying first iis district and tis year. That worked
> perfectly.
> However, when I went estimating my model with Beck and Katz's
> panel-corrected
> standard errors, i.e. applied xtpcse I got an error message saying I
> have to
> tsset! The same occurs when I try to test for cross-district
> correlation and
> for homoscadsticity using xttest2 and xttest3 respectively?!
>
> What am I doing wrong?
I don't think there is anything wrong at all. -help xtpcse- indicates that
your data have to be -tsset-; -help xtgls- does not specify this
requirement. All this means is that the code inside the former requires
-tsset- to work, and the code inside the latter doesn't. If you just
-tsset- your data, everything should be fine.
> Using the opportunity may be a two more questions?
>
> I would like namely to calculate elasticities. Does that work for
> panel
> (N=235, T=29) the usual way with mfx, eyex?
>
> Finally, what I assume with my IVs that one or two are actually
> endogenous.
> I would have applied 3SLS in a "normal" (non-panel) setting to
> address
> endogeniety. Is there any way to do "3SLS" for xt?
> I could not find
> anything
> like that in the literature. May be that is too dumn what I think?
> Actually, intuitively I think I take would-be-3sls structure,
> estimate each of
> them SEPARATELY with xt
You would do this using xtivreg, no? And if you want to go on to estimate
the equations as a system, you could put the data into mean-deviation form
"by hand" (e.g., using Ben Jann's -center-), and then use -reg3-. The SEs
would need a dof correction, but that's not hard to do.
Hope this helps.
--Mark
> (the first equation being the principal) and
> then put
> the results next to each other and treat them as a "real" 3SLS.
> Figuring out
> elasticities I make a distinction in so-called direct and indirect
> effects of
> my RHS variables on the main DV?!!
>
> Any hint will be much appreciated.
>
> Thanks in advance.
>
> Armen
> Doctorate student
> University of Hohenheim
> Germany
>
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> ----- Ende der weitergeleiteten Nachricht -----
>
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>
Prof. Mark Schaffer
Director, CERT
Department of Economics
School of Management & Languages
Heriot-Watt University, Edinburgh EH14 4AS
tel +44-131-451-3494 / fax +44-131-451-3294
email: [email protected]
web: http://www.sml.hw.ac.uk/ecomes
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