Table 3: Characteristics of each component.

MethodComponent (sample)StatisticCrashesLWSW

Time Period 1
-meansComponent 1 (527)Mean510547.1912.8810.080.54
SD6.583013.671.768.450.6
Component 2 (972)Mean1.7964138.0712.49.890.55
SD2.921820.3031.467.770.69

HierarchicalComponent 1 (473)Mean5.06310895.3912.957710.240.53
SD6.582988.961.8038.510.52
Component 2 (1026)Mean1.9394314.8712.399.830.565
SD3.271924.281.447.7780.72

GFMNB-2Component 1 (738)Mean3819112.5811.220.29
SD4.453867.521.628.310.17
Component 2 (761)Mean2.85464612.578.740.81
SD5.132878.961.567.530.85

Time Period 2

-meansComponent 1 (972)Mean2.684364.1412.49.890.55
SD4.712035.8081.467.770.69
Component 2 (527)Mean8.0711184.0412.8810.080.54
SD10.63343.191.768.4590.609

HierarchicalComponent 1 (66)Mean16.6918144.6513.5912.390.64
SD17.713095.9722.038.460.633
Component 2 (1433)Mean4.026237.5312.529.840.5496
SD6.523366.451.5487.980.66

GFMNB-2Component 1 (452)Mean6.279145.6912.9512.980.26
SD8.64457.791.748.120.15
Component 2 (1047)Mean3.855732.6512.418.660.68
SD7.333546.661.497.610.76