an implication expression of the form x --&gt; y, where x and y are itemsets ex: {milk, diaper} --&gt; {beer}  do not mean causality... more like co-occurrence
an implication expression of the form x --&gt; y, where x and y are itemsets ex: {milk, diaper} --&gt; {beer}  do not mean causality... more like co-occurrence
describes relationship between two itemsets. x --&gt; y - x is antecedent (lhs) - y is consequent (rhs)