Loops: Loops of the finger prints
In gpk: 100 Data Sets for Statistics Education

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It is believed that finger print patterns are inherited. The mode of inheritance is not known. One can reduce the data from three-way table to two-way table by collapsing the third dimension. It is expected that patterns on father's thumb are unrelated to those on mother's thumb. On the other hand patterns in child are expected to be related to patterns of either parent. One can also prepare 4*2 contingency tables. This can be used to test independence of child pattern from parent pattern combination. Another possible exploration is conditional independence. For example, is child pattern independent of mother pattern given father's pattern? Lastly, to test complete independence of all three dimensions, one must use the original 2*2*2 table.