Analysis of Vehicle-Following Heterogeneity Using Self-Organizing Feature Maps

Table 3

Two-tail -tests for inter-vehicle-type heterogeneity.

Neuron	Leader’s vehicle type	Sample size	Mean; (m/s^2)	Variance; (m^2/s^4)	-stat	value
	Car	324	−0.78	1.47	−2.080	0.038
	Truck	52	−0.41	−0.41
	Car	283	0.00	0.76	2.133	0.034
	Truck	50	−0.27	−0.27
	Car	293	−0.21	0.84	2.158	0.032
	Truck	35	−0.56	−0.56
	Car	254	0.79	1.05	2.524	0.012
	Truck	65	0.45	0.45
	Car	185	0.11	0.72	2.098	0.037
	Truck	40	−0.21	−0.21
	Car	94	0.28	0.74	2.195	0.030
	Truck	46	−0.05	−0.05
	Car	311	0.53	0.98	−1.977	0.049
	Truck	26	0.94	0.94
	Car	383	0.37	0.93	2.900	0.004
	Truck	36	−0.11	−0.11