Analysis and Prediction on Vehicle Ownership Based on an Improved Stochastic Gompertz Diffusion Process

Table 1

Estimated parameters of improved SGDP and general Gompertz in sample countries.

	Improved SGDP						General Gompertz
	US	589.623	1.453	0.406	432.828	40.879	1.13	774.996	1.167	0.205
UK	83.753	105.702	0.184	533.851	4.529	0.75	515.885	1.464	0.140
Japan	71.671	40.729	0.861	773.112	13.531	0.62	603.796	2.556	0.139
Korea	230.316	19.710	0.246	794.593	141.921	1.42cc	338.00	6.237	0.156