Table 18.

Comparison between different BPSO variants using four S-shaped TFs in terms of average accuracy based on kNN* classifier.

Dataset	Measure	BPSO1	BPSO2	BPSO3	BPSO4
All	AVG	0.7511	0.7518	0.7464	0.7449
	STD	0.0075	0.0045	0.0039	0.0040
Caucasian	AVG	0.7967	0.7954	0.7841	0.7808
	STD	0.0136	0.0114	0.0084	0.0091
Females	AVG	0.8034	0.7941	0.7949	0.7907
	STD	0.0078	0.0070	0.0067	0.0098
Age > 50	AVG	0.7836	0.7782	0.7752	0.7655
	STD	0.0111	0.0111	0.0092	0.0064
Hispanic	AVG	0.7870	0.7862	0.7797	0.7740
	STD	0.0064	0.0067	0.0071	0.0107
Age ≤ 50	AVG	0.8321	0.8211	0.8092	0.7945
	STD	0.0168	0.0099	0.0149	0.0131
Males	AVG	0.7513	0.7205	0.7186	0.7180
	STD	0.0159	0.0081	0.0047	0.0043
Mean Rank	F-test	1.14	2.00	2.86	4.00