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QUESTION
When X and Y are conditionally dependent at each level of Z yet marginally independent, Z is called a suppressor variable.
When X and Y are conditionally dependent at each level of Z yet marginally independent, Z is called a suppressor variable.Specify joint probabilities for a 2 × 2 × 2 table to show that this can happen
(a)when there is homogeneous association, and
(b)when the association has opposite direction in the partial tables.
