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Re: st: Chow test as a solution for testing of equality of coefficients across two separate samples.


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Chow test as a solution for testing of equality of coefficients across two separate samples.
Date   Wed, 23 Jun 2010 08:47:56 +0000 (GMT)

--- On Wed, 23/6/10, natasha agarwal wrote:
> Can you conclude that the sum is significantly different
> from zero then?

No, you will have to explicitly test for it:
test vara + varb = 0

or:
lincom vara + varb

(vara and varb are ofcourse the variable names of your main
effect and the interaction effect)

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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