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

Table 2

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

Different indices	Algorithm	Data sets
		GDS608	GDS2003	GDS2267	GDS2712
DB index	FCM	2.0861	2.4671	1.5916	1.9526
	RCM	1.6109	2.2104	1.0274	1.2058
	SCM	1.5938	2.1346	0.8946	1.0965
	SRCM	1.3274	1.9523	0.7438	0.7326
	SP-FCM	1.2958	1.8946	0.7962	0.6843
Dunn index	FCM	0.2647	0.2976	0.4208	0.3519
	RCM	0.3789	0.3981	0.7164	0.6074
	SCM	0.3865	0.3775	0.8439	0.6207
	SRCM	0.5126	0.4953	0.9759	0.8113
	SP-FCM	0.5407	0.5026	0.9182	0.8049