A Bayesian Network Approach to Causation Analysis of Road Accidents Using Netica

Table 3

Sensitivity analysis result of the node “crash type.”

Node	Mutual info	Percent	Variance of beliefs
Crash type	2.82978	100	0.7195390
Driver’s apparent error	0.57217	20.2	0.0869963
Vehicle movement	0.33948	12	0.0351281
Total casualties	0.21563	7.62	0.0057073
Crash severity	0.17897	6.32	0.0037534
Road geometry	0.04044	1.43	0.0008944
Total serious injuries	0.01888	0.667	0.0004707
Traffic control	0.01125	0.398	0.0001573
Road moisture condition	0.00503	0.178	0.0001027
Light condition	0.00417	0.147	0.0000915
Total estimated damage	0.00407	0.144	0.0000533
Total units involved	0.00394	0.139	0.0002397
Weather condition	0.00313	0.111	0.0000638
Vehicle type	0.00000	0.000	0.0000000