The rule accuracy after R1 has been discovered, where only the positive examples covered by R1 are discarded).

Figure 5.1 illustrates the coverage of the classification rules R1, R2, and R3.

Determine which is the best and worst rule according to:

If the positive examples covered by R1 are discarded, the new accuracies
for R2 and R3 are 70% and 60%, respectively. Therefore R2 is preferred
over R3.