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st: re:


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re:
Date   Sun, 21 Jun 2009 10:42:32 -0400

<>
Martin said

" so it is not telling you anything for which you need to estimate the
regression to find out."

So the point estimate is equal to ouput of other commands, bout how about
the CI?



The unconditional CI is larger:

. means mpg

Variable | Type Obs Mean [95% Conf. Interval]
-------------+----------------------------------------------------------
mpg | Arithmetic 74 21.2973 19.9569 22.63769 | Geometric 74 20.58444 19.38034 21.86335 | Harmonic 74 19.92318 18.81185 21.17405
------------------------------------------------------------------------

because the standardized regressors that are added to the model are indeed correlated with mpg:

_cons | 21.2973 .4121741 51.67 0.000 20.47524 22.11935

but as you can see that doesn't make much difference in testing any meaningful hypothesis about the mean of mpg.


Kit Baum   |   Boston College Economics & DIW Berlin   |   http://ideas.repec.org/e/pba1.html
An Introduction to Stata Programming | http://www.stata-press.com/books/isp.html
   An Introduction to Modern Econometrics Using Stata  |   http://www.stata-press.com/books/imeus.html



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