An Improved Fuzzy c-Means Clustering Algorithm Based on Shadowed Sets and PSO

Table 1

Performance of FCM, RCM, SCM, SRCM, and SP-FCM on four UCI data sets.

Different indices	Algorithm	Data sets
		Iris	Wine	Glass	Ionosphere
DB index	FCM	0.7642	0.8803	2.2971	2.0587
	RCM	0.6875	0.5692	1.9635	1.5434
	SCM	0.6862	0.5327	1.8495	1.4763
	SRCM	0.6613	0.4436	1.5804	1.3971
	SP-FCM	0.6574	0.4328	1.5237	1.4066
Dunn index	FCM	2.3106	2.5834	0.1142	0.8381
	RCM	2.7119	2.8157	0.2637	1.0233
	SCM	2.4801	2.7992	0.3150	1.0319
	SRCM	3.0874	3.1342	0.5108	1.1924
	SP-FCM	3.3254	3.1764	0.4921	1.2605