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Re: st: How can I make a graphic of regression results using only significant effects?


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: How can I make a graphic of regression results using only significant effects?
Date   Sat, 16 Sep 2006 09:28:17 +0100 (BST)

Alvaro:
-postgr3- graphs the results of your model, and your model contains an
interaction, so -postgr3- includes that interaction. Whether or not the
interaction is significant isn't relevant here, you forced that
interaction to be in the model, so it is in the model. If you don't
want that interaction just type remove the interaction from your model,
and than call -postgr3-. However, blindly removing variables that are
insignificant is bad practice. You included that interaction in your
model, so apperently you thought that that interaction is interesting.
The fact that it proves to be insignificant is than also an interesting
result, so than you should include it in your model to show that it is
insignificant. 

HTH,
Maarten

--- Alvaro Zevallos <azevallos@grade.org.pe> wrote:
> I am working in a model that uses an interaction between two dummies 
> variables. The command that I am using is:
> 
> --  xi3: reg Y   i.dummy1*dummy2  X
> 
> and the results are
> 
> dummy1                      (Significant)
> dummy2                      (Significant)
> dummy1* dummy2       (Not significant)
> X                                 (Whatever)
> 
> Then, I use the -  postgr3 - command for make a graphic of the
> results but Stata shows me a figure that consider the not significant
> effect (the interaction). How can I avoid that Stata considers this
> effect?

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting adress:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


		
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