Note: See also Example of a Cochran Mantel Haenszel Test.
The Cochran-Mantel-Haenszel test discovers if there is a relationship between two categorical variables after blocking across a third classification.
Correlation of Scores
Applicable when both Y or X are ordinal or interval. The alternative hypothesis is that there is a linear association between Y and X in at least one level of the blocking variable.
Row Score by Col Categories
Applicable when Y is ordinal or interval. The alternative hypothesis is that, for at least one level of the blocking variable, the mean scores of the r rows are unequal.
Col Score by Row Categories
Applicable when X is ordinal or interval. The alternative hypothesis is that, for at least one level of the blocking variable, the mean scores of the c columns are unequal.
General Assoc. of Categories
Tests that for at least one level of the blocking variable, there is some type of association between X and Y.