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st: Interpretation of factor variables


From   "Yu Chen, PhD" <profyuchen@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Interpretation of factor variables
Date   Thu, 11 Jul 2013 19:00:22 +0800

Dear Statalist,
I have a dummy variable that takes values of one or zero, and a
continuous variable. I ran the following regression.
Dependent Variable (DV) = Dummy + Dummy*Continuous + other control
variables. I used factor variables (i.e., i.Dummy +
i.Dummy#c.Continuous )
I got results as below. My question is how should I interpret the two
lines below Dummy#c.Continuous? The first line shows a 0. I interpret
it as Dummy takes 0 for this line. However, if Dummy takes 0, the
whole term should be zero and should be eliminated from the results.
But Stata still gave me a Coef. What is going on?
Thank you in advance for your help.


------------------------------------------------------------------------------
        DV |      Coef.   Std. Err.      t    P>|t|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
Dummy#c.Continuous |
          0  |   31.54672   9.438251     3.34   0.001     13.04526    50.04818
          1  |   37.70141   7.609734     4.95   0.000     22.78433     52.6185
             |
Dummy |   .1026062   .1648457     0.62   0.534    -.2205349    .4257472


Yu Chen
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