A Roadway Safety Sustainable Approach: Modeling for Real-Time Traffic Crash with Limited Data and Its Reliability Verification

Table 4

Significant risk factors and parameter estimates for the two data sets models.

Variable	Low precision data set		High precision data set
	Mean	Confidence interval	Mean	Confidence interval
Constant	−1.477	(−1.657, −1.294)	−1.5734	(−1.755, −1.391)
abs_dif_o	0.183	(0.008, 0.358)	0.276	(0.102, 0.456)
up_s	−0.299	(−0.507, −0.095)	−0.608	(−0.784, −0.427)
down_dif_v	—	—	−0.209	(−0.387, −0.037)
up_dif_s	—	—	0.250	(0.087, 0.405)
up_dif_o	0.257	(0.060, 0.454)	—	—