Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: conditional test after logistic regression


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: conditional test after logistic regression
Date   Wed, 14 Apr 2010 16:03:08 +0000 (GMT)

--- On Wed, 14/4/10, Ricardo Ovaldia wrote:
> The article that I am reading states the null in terms of
> beta - Ho: (Bx|By)=0 
> 
> Would your answer change if y=x^2?
> 
> So that the model would be:
> 
> logistic case x x2
> 
> where x2=x^2
> 
> and the null is now,  Ho: (Bx2|Bx)=0 ?

Ok, I think I see what you mean. I would then state the H0 as
(Bx2|Bx=0)=0 or probably more interesting is (Bx|Bx2=0)=0. 
The latter hypothesis would mean whether there is an effect, 
given that the effect is non-quadratic. You could test that 
as follows:

logistic case x 
test x

Hope this helps,
Maarten

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

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


      

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index