Table 5.

Validity of clusters depending on different degrees of α for dataset B. Two measures were used: compactness and separation [31] and z-scores [33], shown in parentheses. The z-scores are computed as an average of 10 repetitions for each pair of α and r.

	0.1	0.2	0.3	0.4	0.5
0.00	58.8 (317.9)	58.8 (317.9)	58.8 (317.9)	58.8 (317.9)	58.8 (317.9)
0.10	35.9 (316.6)	26.6 (319.6)	23.6 (330.4)	27.4 (336.9)	30.6 (326.4)
0.20	24.8 (322.9)	29.1 (327.2)	31.5 (333.7)	29.6 (332.4)	29.5 (318.7)
0.30	26.9 (329.2)	30.5 (332.5)	30.5 (322.1)	45.4 (338)	60.2 (327.7)
0.50	29.6 (329.1)	53.5 (324.1)	113.0 (323.5)	226.9 (322.6)	325.4 (329.1)
0.70	70.0 (334.8)	289.4 (332.4)	614.1 (320.8)	1090.6 (315.8)	1708.6 (253.9)