Confidence of an Association Rule

Properties2

Type	Concept
Note created	Feb 17, 2025

The confidence of an association rule $A\to C$ is a metric measuring the probability of seeing the consequent in a transaction where the antecedent appears. It lies in the range $[0,1]$ and can be defined using the support as:

$$\text{confidence}(A\to C)=\frac{\text{support}(A\to C)}{\text{support}(A)}$$