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st: Interpretation of factor variables
From
"Yu Chen, PhD" <[email protected]>
To
[email protected]
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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