Obstacle Emergence Risk and Road Patrol Policy

Table 2

Estimation results of the Poisson-Gamma model.

	Poisson-Gamma model
	𝛽1	𝛽2	𝛽3	𝛽4	𝛽5	𝜙
Maximum likelihood estimate	−4.82	8.51×10^−5	1.57×10^−2	9.49×10^−3	0.11	3.20
(𝑡-value)	(−15.51)	(14.56)	(17.25)	(4.22)	(3.99)	(20.22)
Log likelihood	−18,325
AIC	36,663