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st: Re: Cochran Mantel Haenszel Statistic


From   Robert A Yaffee <bob.yaffee@nyu.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: Cochran Mantel Haenszel Statistic
Date   Wed, 22 Sep 2010 08:46:43 -0400

Hi,
   Has any attempted to write a Cochran Mantel-Haenszel Statistic for the homogeneity of stratified crosstabulations?
     Robert
   

Robert A. Yaffee, Ph.D.
Research Professor
Silver School of Social Work
New York University

Biosketch: http://homepages.nyu.edu/~ray1/Biosketch2009.pdf

CV:  http://homepages.nyu.edu/~ray1/vita.pdf

----- Original Message -----
From: Maarten buis <maartenbuis@yahoo.co.uk>
Date: Wednesday, September 22, 2010 5:23 am
Subject: Re: st: RE: Logistic regression interpretation
To: statalist@hsphsun2.harvard.edu


> --- On Wed, 22/9/10, Kieran McCaul wrote:
> > low risk, control group: OR=1.00 (ref)
> > high risk, control group: OR=2.11
> > low risk, treatment group: OR=4.79
> > high risk, treatment group: OR=2.11*4.79=10.11
> 
> 
> --- I wrote:
> > There are no interactions so the odds increases
> > with a factor 2.1 when one receives the treatment
> > regardless of whether one is in the high or
> > low risk group 
> 
> These two statements appear to be a contradiction,
> but they are not. The difference is in what we define 
> as our reference group.
> 
> I compared control versus treatment both in high risk 
> group and control versus treatment both in the low 
> risk group. This is how I think of "controlling for
> a variable".
> 
> Kieran compared all groups with the low risk control
> group. 
> 
> As always, an effect is just a comparison of groups,
> so think about what kind of comparison would answer 
> your research question, and choose your definition
> of reference group accordingly.
> 
> 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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