Question

If itemsets x and y are both frequent but rarely occur together, then itemsets are said to be negatively correlated and indicated as

Answer 1

Answer:

If itemsets X and Y are both frequent but rarely occur together (i.e., s u p ( X ∪ Y ) < s u p ( X ) × s u p ( Y ) ), then itemsets X and Y are negatively correlated, and the pattern X ∪ Y is a negatively correlated pattern.