Confidence is defined as the measure of certainty or trustworthiness associated with each discovered pattern. Suppose min_sup is the minimum support threshold. An itemset satisfies minimum support if the occurrence frequency of the itemset is greater than or equal to min_sup.

What is min confidence in Apriori?

Apriori implements the Apriori algorithm (see Section 4.5). It starts with a minimum support of 100% of the data items and decreases this in steps of 5% until there are at least 10 rules with the required minimum confidence of 0.9 or until the support has reached a lower bound of 10%, whichever occurs first.

What does the confidence metric in the Apriori algorithm indicate?

Confidence. Confidence is the ratio of the rule support to the number of transactions that include the antecedent.