Traffic Flow Forecasting for Road Tunnel Using PSO-GPR Algorithm with Combined Kernel Function

Table 8

RE of predicted results for verifying samples/%.

Number	GPR-SE	GPR-RQ	GPR-CK
	2.55	2.66	1.44
	2.39	2.39	1.20
	6.72	7.46	5.47
	4.56	4.56	3.10
	4.23	4.38	3.47
	6.61	6.82	0.43
	2.58	2.78	0.60
	1.62	1.62	0.49
	0.25	0.25	1.00
	2.11	2.11	2.49
	3.42	3.64	0.91