<>
Well, note in this example from Baum(2006),
http://www.stata-press.com/books/imeus.html,
theta is a constant with a "complete" panel, i.e. every unit is observed
over all time periods. Run -xtdes- to see that.
When you drop single observations randomly, you get a distribution for
-theta- as the participation pattern in the panel is now no longer
homogeneous...
*************
*get data
use http://www.stata-press.com/data/imeus/traffic, clear
*regression with "complete" panel
xtreg fatal beertax spircons unrate perincK, re the
xtdes
*make it incomplete
drop if runiform()<0.1
xtreg fatal beertax spircons unrate perincK, re the
xtdes
*************
HTH
Martin
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[mailto:[email protected]] Im Auftrag von
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Gesendet: Dienstag, 7. April 2009 10:23
An: [email protected]
Betreff: st: interpreting distribution of theta in xtreg ,re theta
Hello everybody,
Can somebody please help me with the following rather beginner problem of
mine. Using STATA 8 I have computed couple of Regressions estimating Random
effects usng xtreg ..., re theta which delivers the distribution of theta as
well. From the STATA Manual I have understood that theta is an important
component in estimating random effects, but I am not sure how to interpret
the distribution in other words what is the optimal distribution and are
there some distributions which could question the whole regression result?
Thank you in advance for any comments and insight.
Greetings,
Jakub Orsag
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