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Re: st: conditional test after logistic regression
From
Ricardo Ovaldia <[email protected]>
To
[email protected]
Subject
Re: st: conditional test after logistic regression
Date
Wed, 14 Apr 2010 08:47:22 -0700 (PDT)
Thank you Maarten. That is what I thought, but I am not sure that I want conditioning on y. 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 ?
Ricardo
Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK
--- On Wed, 4/14/10, Maarten buis <[email protected]> wrote:
> From: Maarten buis <[email protected]>
> Subject: Re: st: conditional test after logistic regression
> To: [email protected]
> Date: Wednesday, April 14, 2010, 10:36 AM
> --- On Wed, 14/4/10, Ricardo Ovaldia
> wrote:
> > If I fit:
> >
> > . logistic case x y
> >
> > I can test the null Ho:Bx=0, By=0 using:
> >
> > . test x y
> >
> > How can I test the null Ho: (Bx|By)=0 ?
>
> I am guessing you want to condition on y
> an not on By. In that case the answer can
> be pretty easy: you haven't included an
> interaction term between x and y, so that
> is just
>
> text x
>
> However, this will only work if you are
> interested in effects in terms of odds
> ratios or log odds ratios. Things get
> more complicated when you want to look
> at marginal effects.
>
> 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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