Table 2.

Number of features produced after applying different dimensionality reduction techniques.

PCA	POV*	99.0	95.0	90.0	85.0	80.0	75.0	70.0	65.0	60.0
	# of components	426	333	259	205	163	130	109	102	62
	% full feature space†	0.932	0.723	0.567	0.449	0.357	0.828	0.239	0.223	0.136
MI	% feature space	75.00	50.00	25.00	10.00	5.00	1.00	0.50	0.10	0.05
	# of features	34,271	22,847	11,423	4,569	2,284	1,142	456	228	45
Ontology + PCA	POV*	99.0	95.0	90.0	85.0	80.0	75.0	70.0	65.0	60.0
	# of components	405	289	210	158	121	93	71	54	41
	% full feature space†	0.886	0.632	0.460	0.346	0.265	0.204	0.155	0.118	0.090
Ontology + MI†	% ontology feature space	75.00	50.00	25.00	10.00	5.00	1.00	0.50	0.10	0.05
	% full feature space	47.2	35.1	17.6	7.02	3.51	0.702	0.350	0.70	0.035
	# of features	24,135	16,054	8,027	3,210	1,605	321	160	32	16

^*Proportion of variance.

^†These percentages are less than 1.0% of the full feature space.

^‡Number of Ontology features (i.e., Ontology without PCA or MI) is 32,180 features.