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st: Interaction terms


From   lreine ycenna <lreine.ycenna@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Interaction terms
Date   Tue, 3 May 2011 14:05:16 +0100

Hi,

(1) I'm running a regression, wanting to see the effect of overseas living
experience (OV) on one's income (y) which is also determined by eudcation
level (edu) and wealth.

regress y ov edu wealth ovxedu ovxwealth.

I also want to see the effect of overseas experience on y with a mixed
variable:  edu and wealth.

If I run regress y ov edu wealth eduxwealth ovxedu ovxwealth ovxeduxwealth,
I might run into collinearity problems when I include more variables in the
future.

or can I run a separate regression such as regress y ov wealthxedu
ovxwealthxedu? Which one is correct?


(2) when I run regress y ov edu wealth eduxwealth ovxedu ovxwealth
ovxeduxwealth, OV has a negative coefficient,

 but it changes to positive when I run regress y ov wealthxedu
ovxwealthxedu. What does this suppose to mean?

(3) I have very large standard errors (ranged from 0-14) when running
both equations. Does this mean that the results are very 'imprecise'?

lreine
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