Table 1.

Parameter Estimates from Hierarchial GLMM model

Variable (β)	Posterior Mean	95% HPD
Passenger presence	−0.181	−0.194 to −0.168
Night Driving	−0.192	−0.204 to −0.182
Having Risky Friends	0.406	0.072 to 0.729
${\sigma }_b^2$	0.287	0.165 to 0.423
${\sigma }_O^2$	0.269	0.263 to 0.275
${\sigma }_S^2$	0.125	0.113 to 0.137
	26.824	29.83 to 44.26