Analysis of Nonsevere Crashes on Two- and Four-Lane Urban and Rural Highways: Effects of Wet Pavement Surface Condition

Table 9

Test for equality of mean, homogeneity of variances, and similarity in distribution of the aggregate crashes across the categorical variables.

Variables		Levene’s Test	Welch’s Test	Kruskal-Wallis Test	Games-Howell Test
Pavement Surf. Cond.	Test Stat.	555.250	558.790	430.090	23.640
	-Value	0.001	0.001	0.001	0.001
Rural/Urban	Test Stat.	33.140	22.330	1.580	4.730
	-Value	0.001	0.001	0.209	0.001
No. of Lanes	Test Stat.	2.210	4.800	7.900	2.190
	-Value	0.137	0.029	0.005	0.028
Lighting	Test Stat.	8.820	9.050	3.440	3.010
	-Value	0.003	0.003	0.064	0.003
Weather	Test Stat.	381.900	478.790	293.590	21.880
	-Value	0.001	0.001	0.001	0.001