Hi,
I've problem with the command -tsset-.
When I try to set time variable, it shown that
. tsset year, yearly
repeated time values in sample
So I can not use some command such as -levinlin-.
I don't understand why I can't set only time variable because when I
use -tsset- to set both
time variable and panel id variable, it work.
tsset country Year, yearly
panel variable: country, 1 to 10
time variable: Year, 1990 to 2005
What's wrong with my data?
Regards,
A. Sura
On 4/21/07, Kit Baum <[email protected]> wrote:
Keynes said
I already run the fixed effect model and F-test accept the null
hypothesis.
So I have to work on pooled OLS.
I also check for the heteroskedastic, here is the result
Breusch-Pagan / Cook-Weisberg test for heteroskedasticity
Ho: Constant variance
Variables: fitted values of gdppercapita
chi2(1) = 2.58
Prob > chi2 = 0.1085
which, if I'm not misunderstand, mean that there's no heteroskedastic
problem.
For the P-value, is that mean I have to divide by 2 before check the
significance of the
coeffiicent?
Could you please suggest me how to test autocorrelation and how to
correct it if I found the
problem.
No, you do NOT have to divide the pvalue by two. That would only be
appropriate if you were conducting a one-tailed test. For a two-
tailed test, leave it alone.
There is no obvious way of considering a test for autocorrelation in
the pooled OLS context. You would have to conduct a test on each
panel, and determine some way of combining results from those tests
(similar to the issue of designing a panel unit root test). That is
why I suggested using ivreg2 (in the absence of unobserved
heterogeneitty) and estimating the model with HAC standard errors. If
HAC standard errors are quite similar to pooled OLS standard errors,
then there is no concern of non-iid disturbances.
Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html
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