Question: Exercise 3 . 3 . 9 : In Example 3 . 9 , each of the three estimates of Jaccard similarity we obtained was either

Exercise

3.3.9

: In Example

3.9,

each of the three estimates of Jaccard similarity we obtained was either smaller than or the same as the true Jaccard similarity. Is it possible that for another pair of columns, the average of the Jaccard similarities of the upper and lower halves will exceed the actual Jaccard similarity of the columns?

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