[R] compare odds ratios

array chip arrayprofile at yahoo.com
Tue Jun 27 20:22:14 CEST 2006

Hi dear all, I haven't heard any suggestions on how to
tackle the problem in my previous email yet. I
searched on google and was not getting any useful
information yet. I did get someone from google groups
suggesting Cockran Mantel Haenszel test with each
subject as the stratum. But as far as I understand,
CMH test is to test whether the common odds ratio
(assuming odds ratios across stratum are equal) is
equal to 1, not really the question I was asking which
was whether the 2 odds ratios were equal (doesn't
matter if they are equal to 1). Also, someone
suggested loglinear regression, but I am not sure
either how to set things up for my problem.

One clarification to my original email: the 2
diagnostic tests were performed on the set set of
patients, the issue here how to test whether the 2
odds ratios for the 2 diagnostic tests are equal.

Here is a hypothetical dataset, for example:


Hope some statistical experts would guide me some
directions. Many thanks

--- array chip <arrayprofile at yahoo.com> wrote:

> Hi there, is there any way to compare 2 odds ratios?
> I
> have two tests that are supposed to detect a disease
> presence. So for each test, I can compute an odds
> ratio. My problem is how can I compare the 2 tests
> by
> testing whether the 2 odds ratios are the same?
> Appreciate
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