Do Expressway Interchanges Increase Crash Injury Severities? Insights Using Temporal Instability and Unobserved Heterogeneity

Table 3

Likelihood ratio test results of crash in IAC in different years.

2017	2018	2019
2017	—	32.18 (10) [>99.21%]	48.26 (6) [>99.99%]
2018	42.75 (6) [>99.99%]	—	39.52 (6) [>99.99%]
2019	52.61 (6) [>99.99%]	36.94 (10) [>99.42%]	—

Note. () is the degree of freedom of the model; [] is the confidence level.