Estimate the overall odds ratio of the set of tables in Problem3.6 and test whether the odds ratios are the same across the tables.

Problem3.6 is:

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3.6 Use the DOS data to test whether there is gender and depression (dichotomized ac- cording to no and minor/major depression) association by stratifying medical burden and education levels, where medical burden has two levels (CIRS <6 and CIRS > 6) and education has two levels (edu < 12 and edu >12). This is a problem of testing association for a set of four 2 x 2 tables.