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Comparing contingency analyses across groups?

I am comparing the results of an assay 'Test A' to its gold standard 'Test B' (both are +/- results). I have these results for 3 different groups and need so see if there is a significant difference in the contingency analyses among the 3 groups.

Using Analyze-->Fit Y by X--> Test A vs Test B by Group, I got 3 individual mosaic plots & contingency tables (1 for each group), but can't find how to combine them into one large mosaic plot that allows analysis between the groups.

A Fit Y by X-->Test A vs Test B block Group gave the Cochran-Mantel-Haenszel tests. This is close to what I need, but I need the contingency data not just frequency counts for each group. I didnt' see anything in the red hotbutton for expanding the CMH tests.

Is there a way to compare the Col% and Row% from the contingency tables of these 3 groups?

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