# Temporal Instability Analysis of Injury Severities for Angle and Non-Angle Crashes at Roundabouts
## 7 Summary and Conclusions
\begin{table}
\begin{tabular}{l c c c c c c} \hline \hline
**Variable** & **Parameter** & \multicolumn{5}{c}{**Marginal Effects**} \\ \cline{3-6}  & **Estimates** & **z-Stat** & **No** & **Minor** & **Severe** \\ \hline Constant [MI] & \(-3.67\) & \(-3.09\) & & & & \\ Random parameter (normally distributed) & \(1.56\) & \(2.03\) & \(-0.0062\) & \(0.0104\) & \(-0.0042\) \\ Daylight indicator (\(1\) if the light condition was daylight, \(0\) otherwise) [NI] & \((2.03)\) & \((1.91)\) & & & \\ Heterogenicity in the mean of random parameter & \(-0.92\) & \(-1.95\) & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\  & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Model results of mixed logit with heterogeneity in means for angle crashes in Florida 2016-2017. \begin{table}
\begin{tabular}{l c c c c c c} \hline \hline \multirow{2}{*}{**Variable**} & \multicolumn{2}{c}{**Parameter**} & \multicolumn{4}{c}{**Marginal Effects**} \\ \cline{3-7}  & **Estimates** & **z-Stat** & **No** & **Minor** & **Severe** \\ \hline
**Constant [MI]** & \(-\)0.88 & \(-\)3.15 & & & & \\ Random parameter (normally distributed) & \(-\)3.23 & \(-\)2.54 & 0.0044 & 0.0026 & \(-\)0.0070 \\ Weeked indicator (1 if a crash occurred during the weekend, 0 otherwise) [SI] & (4.16) & (2.07) & & & \\ \hline
**Heterogeneity** (1 if the crash occurred during the weekend, 0 otherwise) [SI]: & 4.32 & 2.18 & & & \\ \hline
**Rain indicator (1 if the weather was rainy, 0 otherwise)** & 4.32 & 2.18 & & & \\ Environmental characteristics & & & & & \\ Dark-lighted indicator (1 if the light condition was dark-lighted, 0 otherwise) [NI] & 1.25 & 3.06 & 0.0343 & \(-\)0.0189 & \(-\)0.0154 \\ Rain indicator (1 if the weather was rainy, 0 otherwise) [NI] & 2.20 & 2.08 & 0.0147 & \(-\)0.0040 & \(-\)0.0107 \\ Roadway characteristics & & & & & \\ \hline
**Faved shoulder indicator (1 if the type of shoulder was paved, 0 otherwise) [NI]** & 4.13 & 3.08 & 0.2070 & \(-\)0.1975 & \(-\)0.0095 \\
**Faved shoulder indicator (1 if the type of shoulder was paved, 0 otherwise) [M]** & 3.59 & 2.60 & \(-\)0.1714 & 0.1738 & \(-\)0.0024 \\
**Unpaved shoulder indicator (1 if the type of shoulder was unpaired, 0 otherwise) [NI]** & 0.89 & 1.69 & 0.0139 & \(-\)0.0062 & \(-\)0.0077 \\
**Straight indicator (1 if road roadway alignment was straight, 0 otherwise) [MI]** & 0.64 & 1.86 & \(-\)0.0426 & 0.0560 & \(-\)0.0134 \\
**Cash characteristics** & & & & & \\ Speeding indicator (1 if speeding involved in the crash, 0 otherwise) [SI] & 4.48 & 2.57 & \(-\)0.0078 & \(-\)0.0018 & 0.0096 \\ Human characteristics & & & & & \\ Cyclist indicator (1 if cyclists involved in the crash, 0 otherwise) [MI] & 2.03 & 2.73 & \(-\)0.0107 & 0.0166 & \(-\)0.0059 \\ Number of observations & & & & & 12 & \\ Log-likelihood at zero (\(LL(0)\)) & & & & \(-\)263.67 & & \\ Log-likelihood at convergence (\(LL(\beta)\)) & & & & \(-\)187.49 & & \\ \(\sigma^{2}=1-LL(\beta)/LL(0)\) & & & & & 0.29 & \\ AIC & & & & & 398.98 & \\ BIC & & & & & 440.75 & & \\ \hline \hline \end{tabular} Note: NI = no injury; MI = minor injury; SI = severe injury.  
\end{table} 
Table 6: Model results of mixed logit with heterogeneity in means for angle crashes in Florida 2018-2019.