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Re: st: Meta-analysis, Breslow-Day test for non-binary variable (Out of office)


From   "Sarah Tougher" <Sarah.Tougher@lshtm.ac.uk>
To   "Berthold Hoppe" <berthold.hoppe@charite.de>, <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Meta-analysis, Breslow-Day test for non-binary variable (Out of office)
Date   Thu, 20 Oct 2011 13:35:47 +0100

I am out of the office until November 7th. I have intermittent access to email, but will try to return your message as soon as possible. 

>>> Berthold Hoppe <berthold.hoppe@charite.de> 10/20/11 13:35 >>>

Dear Steve.

The interaction term

********************
xi3: logit x i.y*z
********************

gives a P for the BD test.

Thanks a lot,

Berthold


Am 19.10.2011 um 21:23 schrieb Steven Samuels:

> 
> The BD Test is, in your case,  a 2 d.f. of equal OR in the two cohorts; as such it is a test of the interaction between y and z in a logistic regression model.
> 
> ***********************************
> logistic  x  y##z,  coeflegend
> test 2.y#1.z 3.y#1.z  
> ************************************
> 
> Steve
> 
> On Oct 19, 2011, at 8:09 AM, Berthold Hoppe wrote:
> 
> Dear all.
> 
> Using -mhodds x y, by(z)- I have analyzed the relation between -x- (0 or 1) and -y- (0 or 1 or 2) in two cohorts (-z-) to get pooled OR and M-H for homogeneity. 
> In a review process I am now asked to provide a P for homogeneity by Breslow-Day instead of Mantel-Haenszel testing. Does anyone know if and how this could be calculated by STATA? 
> As -y- is not binary -cc x y, by(z) bd- will not work.
> I have tried to use -meta-, -metan- or -metacum- but a Breslow-Day test seem to be possible only if -y- is binary. 
> 
> Many thanks in advance,
> Berthold
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