Research on Collection and Preprocessing Strategies of Traffic Data Driven by Big Data

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The velocity data Pearson correlation coefficient value

ρ	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday	Sunday
Monday	1
Tuesday	0.9324	1
Wednesday	0.9245	0.9343	1
Thursday	0.9211	0.8915	0.9319	1
Friday	0.9141	0.9187	0.9123	0.9275	1
Saturday	0.635	0.6555	0.6569	0.6465	0.684	1
Sunday	0.6122	0.6116	0.6382	0.6271	0.6143	0.7867	1

Experimental results in MCAR, MIXED&MAR data deletion mode

Traffic flow data	δ	LRMC	PPCA	LLS	KSR-EN	HaLRTC	TDIM
MCAR	0.2	81.83	77.23	73.84	68.25	64.04	60.55
	0.3	83.2	81.57	81.42	70.61	65.91	60.34
	0.4	87.41	83.88	88.83	75.76	71.19	64.07
	0.5	89.1	88.86	100.5	79.92	73.39	66.15
	0.6	95.59	93.23	113.49	86.41	77.8	71.99
MIXED	0.2	88.82	81.86	80.25	71.62	67.99	61.87
	0.3	91.48	87.66	84.98	76.34	69.17	62.72
	0.4	95.65	89.45	93.21	80.68	71.05	64.4
	0.5	97.36	94.29	102.48	87.28	74.92	69.69
	0.6	103.23	100.61	117.36	94.83	79.79	73.52
MAR	0.2	98.81	90.37	84.32	77.2	68.15	66.23
	0.3	100.3	96.04	90.09	79.94	71.93	66.61
	0.4	102.17	98.61	100.03	86.83	74.93	72.39
	0.5	107.4	101.79	112.08	91.53	76.77	74.87
	0.6	108.91	105.64	129.41	99.1	85.72	79.6

The correlation coefficient value of the adjacent road velocity data

ρ	Road 1	Road 2	Road 3	Road 4	Road 5
Road 1	1
Road 2	0.8608	1
Road 3	0.8249	0.8299	1
Road 4	0.5107	0.5145	0.5075	1
Road 5	0.5286	0.5181	0.5153	0.8714	1

Data experiment results of different missing modes and missing rates

Traffic flow data	δ	LRMC	PPCA	LLS	KSR-EN	HaLRTC	TDIM
MCAR	0.2	4.446	4.161	3.982	3.702	2.738	2.804
	0.3	4.522	4.402	4.403	3.833	2.842	2.792
	0.4	4.756	4.530	4.815	4.119	3.135	2.999
	0.5	4.850	4.807	5.463	4.350	3.257	3.115
	0.6	5.211	5.049	6.185	4.711	3.502	3.439
MIXED	0.2	4.834	4.418	4.338	3.889	2.957	2.877
	0.3	4.982	4.740	4.601	4.151	3.023	2.924
	0.4	5.214	4.839	5.058	4.392	3.127	3.018
	0.5	5.309	5.108	5.573	4.759	3.342	3.312
	0.6	5.635	5.459	6.400	5.178	3.613	3.524
MAR	0.2	5.389	4.891	4.564	4.199	2.966	3.119
	0.3	5.472	5.206	4.885	4.351	3.176	3.141
	0.4	5.576	5.348	5.437	4.734	3.343	3.462
	0.5	5.867	5.525	6.107	4.995	3.445	3.599
	0.6	5.951	5.739	7.069	5.416	3.942	3.862

Pearson coefficient of velocity data for continuous four-star period

ρ	Week 1	Week 2	Week 3	Week 4
Week 1	1	0.8316	0.7792	0.7936
Week 2		1	0.7458	0.7219
Week 3			1	0.8248
Week 4				1