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st: Equivalent variables but different results
From
"Yu Chen, PhD" <[email protected]>
To
[email protected]
Subject
st: Equivalent variables but different results
Date
Thu, 11 Jul 2013 21:46:17 +0800
Dear Statalist,
I ran the following code, and made sure that dd is equivalent to
c.length#i1.foreign, and foreign is equivalent to i1.foreign by using
the list command.
However, when I put the variables into regressions, I got very
different results. I want to know why this happened.
Thank you.
sysuse auto , clear
gen dd=length*foreign
list foreign i1.foreign dd c.length#i1.foreign
reg mpg dd foreign
reg mpg c.length#i1.foreign i1.foreign
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