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Mantel Haenszel estimator is an estimator of assumed common odds ratio in the series of two-by-two contingency tables arising from the different populations, for instance, occupation, country of origin, and many more. Specifically the estimator can be defined as follows here k is the number of two-by-two tables involved and a, b, c, d are few counts.
HOW TO CONSTRUCT A BIVARIATE FREQUENCY DISTRIBUTION
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