Table 4. Performance comparison of Correlation-based feature extraction method at various thresholds.

Threshold	0.1			0.05			0.02
Metric	P	R	F1	P	R	F1	P	R	F1	S
Angry	0.72	0.77	0.75	0.76	0.73	0.74	0.73	0.73	0.73	808
Calm	0.60	0.70	0.64	0.70	0.70	0.70	0.76	0.55	0.64	93
Disgust	0.52	0.47	0.50	0.50	0.49	0.49	0.53	0.52	0.52	843
Fear	0.63	0.49	0.56	0.60	0.53	0.56	0.61	0.51	0.56	851
Happy	0.57	0.54	0.55	0.60	0.58	0.59	0.55	0.55	0.55	865
Neutral	0.54	0.57	0.55	0.53	0.56	0.54	0.52	0.58	0.55	709
Sad	0.52	0.66	0.58	0.56	0.63	0.59	0.58	0.65	0.61	809
Surprise	0.84	0.82	0.83	0.82	0.88	0.85	0.88	0.90	0.89	279