Poisson

Negative binomial

Zero-inflated Poisson

Zero-inflated Negative binomial

No injury accidents

alpha

?

1.0921 (17.67)

?

0.7650 (13.12)

−2 LL

9067.2

5368.8

7710.2

5271.7

Vuong statistic

?

?

10.60

?

AIC

9083.2

5386.8

7742.2

5305.7

BIC

9093.4

5398.3

7762.6

5327.3

Injury or fatal accidents

alpha

?

0.7718 (7.65)

?

0.6535 (7.14)

−2 LL

2485.1

2346.5

2360.3

2320.1

Vuong statistic

?

?

3.83

?

AIC

2501.1

2364.5

2392.3

2354.1

BIC

2511.3

2376.0

2412.7

2375.7