Table 4. The results of experiments that varied the number of classes from three to nine, showing the number of outliers—the number of trials out of 30 that did not yield a unique solution.

Row two shows the average number of solutions found in those outliers. The results indicate that a partitioning into either 4 or 6 classes is most likely to produce a unique solution.

Number of classes	3	4	5	6	7	8	9
Number of outliers	3	0	1	0	2	1	2
Averages of outliers	51	0	100	0	155.5	122	210