Statalist


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: re: beta coefficients for interaction terms


From   Kit Baum <baum@bc.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: beta coefficients for interaction terms
Date   Sun, 21 Jun 2009 10:43:58 -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



*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index