Improving Precision and Reducing Runtime of Microscopic Traffic Simulators through Stratified Sampling

Table 4

Comparison of sample sizes under SRS and LHS for the same level of precision.

Network	SRS sample size	Equivalent sample size under LHS1 to achieve identical precision to SRS			Equivalent sample size under LHS2 to achieve identical precision to SRS
		Delay	Number of stops	Speed	Delay	Number of stops	Speed
Arterial undersaturated	2	2	2	2	2	2	2
	4	3	3	3	3	3	3
	10	6	5	6	6	5	6
	20	11	9	11	10	8	10
	50	22	17	23	20	16	20
	100	39	29	40	34	26	35
Arterial oversaturated	2	2	2	2	2	2	2
	4	2	2	2	2	2	2
	10	4	4	4	4	4	4
	20	7	7	7	6	6	6
	50	12	12	12	11	10	11
	100	19	18	19	16	16	16
Grid undersaturated	2	2	2	2	2	2	2
	4	3	3	3	3	3	3
	10	8	7	8	7	6	8
	20	14	12	15	13	10	14
	50	32	25	34	29	19	31
	100	59	44	64	54	32	57
Grid oversaturated	2	2	2	2	2	2	2
	4	3	3	3	3	3	3
	10	6	6	5	5	6	5
	20	9	11	9	8	9	8
	50	18	23	18	16	19	15
	100	30	40	30	25	31	25