Table 2.

Accuracy rate, Kappa statistic, and the number of rules for the different numbers of objects per leaf.

Minimum number of objects per sheet	Accuracy (%)	Kappa statistic	Number of rules
3	79.72	0.73	7
6	78.54	0.71	15
9	81.69	0.75	12
12	80.17	0.73	9
15	77.95	0.71	10
18	76.97	0.69	6
21	75.59	0.67	6
24	77.75	0.70	6
27	77.75	0.70	5
30	77.95	0.71	5