Table 3.

Minimum MSE values and the corresponding number of selected features.

Dataset	Method
	ELM_PSO	ELM_FS	SVM_FODPSO	RReliefF	ELM_FODPSO	all features
MSE N. feature
D1	0.0983∣8	0.0806∣27	0.0804∣14	0.0804∣26	0.0791∣11	0.0820∣30
D2	0.2844∣9	0.2003∣1	0.2919∣9	0.2003∣1	0.1982∣1	0.3172∣10
D3	0.0099∣5	0.0160∣11	0.0106∣7	0.0108∣6	0.0098∣5	0.0171∣12
D4	0.0157∣8	0.0157∣9	0.0253∣20	0.0238∣18	0.0156∣7	0.0437∣53
D5	0.0838∣8	—	0.0853∣7	0.0838∣8	0.0841∣6	0.0838∣8
D6	0.0827∣10	—	0.0981∣7	0.1292∣1	0.0819∣9	0.1502∣13
D7	0.0339∣9	—	0.0343∣6	0.0355∣12	0.0336∣8	0.0355∣12