14.7 THE CONFIDENCE QUOTIENT CRITERION
To demonstrate the confidence quotient criterion, we generate rules using a lower bound of 40 (along with minimum antecedent support of 1%, minimum rule confidence of 5%, and maximum antecedents of 1). After removing any rules with Churn in the antecedent, we obtain the three association rules shown in Figure 14.7.
![No alt text required.](https://static.packt-cdn.com/products/9781119526810/graphics/images/c14f007.gif)
Figure 14.7 Association rules in R found using confidence quotient lower bound = 40.
The confidence quotient evaluation measure gives the absolute ratio between the prior probability of the consequent (Churn = True) and the confidence of the rule. So, rules would be included in this case only if:
![equation](https://static.packt-cdn.com/products/9781119526810/graphics/images/c14-disp-0017.png)
whichever is not negative.
Let us confirm the calculations for Rule [3] from Figure 14.5. This rule has confidence 0.43051. From Figure 14.1, the prior proportion of the consequent...