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st: How do I test if coefficients are sign different from each otherin grouped data?
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From |
lena Lindahl <[email protected]> |
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To |
[email protected] |
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Subject |
st: How do I test if coefficients are sign different from each otherin grouped data? |
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Date |
Fri, 10 Feb 2006 09:29:02 +0100 |
Hello!
I want to find out if the impact of one variable, (X), differs between
siblings with different birth order (ORDER) and family size (SIZE).
There are three categories each of ORDER and SIZE, they are represented
by dummy variables and I also use interactions in the following way:
Y=X+(ORDER1-3) + (SIZE1-3) + (ORDER1-3)*(SIZE1-3) + X*(ORDER1-3)+
X*(SIZE1-3) + X*(ORDER1-3)*(SIZE1-3)
(I decided to create the dummy variables myself instead of using the
-xi- command.)
Now I want to test if there are any significant birth-order and
family-size effects.
Very glad for any help!/ Lena
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