U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| REPORT |
| This report is an archived publication and may contain dated technical, contact, and link information |
|
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| Publication Number: FHWA-HRT-16-036 Date: April 2016 |
Publication Number: FHWA-HRT-16-036 Date: April 2016 |
This appendix contains the regression output for the models using the unmatched data. These models were used to develop the CMFs.
| Total Crashes | ||||||
|---|---|---|---|---|---|---|
| Mixed-effects nbinomial regression | Number of obs = | 516 | ||||
| Overdispersion: mean | ||||||
| Group variable: Location | Number of groups = | 104 | ||||
| Wald chi2 (19) = | 121.79 | |||||
| Log likelihood = -1134.4724 | Prob > chi2 = | 0.0000 | ||||
| TOT | | Coef. | Std. Err. | z | P > |z| | [95% Conf. | Interval] |
| Treated | | -.0651048 | .1452097 | -0.45 | 0.654 | -.3497105 | .219501 |
| LNAADTMaj | | .8827815 | .1499963 | 5.89 | 0.000 | .5887942 | 1.176769 |
| LNAADTMin | | .1138795 | .0520072 | 2.19 | 0.029 | .0119472 | .2158118 |
| | | ||||||
| THRU_SPEED | | ||||||
| 30 | | -.0663538 | .6472018 | -0.10 | 0.918 | -1.334846 | 1.202138 |
| 35 | | .1191612 | .6194883 | 0.19 | 0.847 | -1.095014 | 1.333336 |
| 40 | | .3005828 | .6417147 | 0.47 | 0.639 | -.9571549 | 1.558321 |
| 45 | | .3793965 | .6377301 | 0.59 | 0.552 | -.8705315 | 1.629325 |
| 50 | | -.3578762 | .7042309 | -0.51 | 0.611 | -1.738143 | 1.022391 |
| 55 | | .6114627 | .6921769 | 0.88 | 0.377 | -.745179 | 1.968104 |
| 60 | | .4465226 | .9637542 | 0.46 | 0.643 | -1.442401 | 2.335446 |
| | | ||||||
| INT_SPEED | | ||||||
| 25 | | .40674 | .4660948 | 0.87 | 0.383 | -.506789 | 1.320269 |
| 30 | | .62461 | .4456572 | 1.40 | 0.161 | -.248862 | 1.498082 |
| 35 | | .6398991 | .4503864 | 1.42 | 0.155 | -.2428419 | 1.52264 |
| 40 | | .6039956 | .4907412 | 1.23 | 0.218 | -.3578394 | 1.565831 |
| 45 | | .9291992 | .4785334 | 1.94 | 0.052 | -.008709 | 1.867107 |
| 55 | | .9122952 | .528974 | 1.72 | 0.085 | -.1244748 | 1.949065 |
| | | ||||||
| THRU_LW | | .1335091 | .1174843 | 1.14 | 0.256 | -.0967559 | .3637741 |
| ThruLane5Up | | -.4314039 | .2038598 | -2.12 | 0.034 | -.8309617 | -.031846 |
| FRTH_LEG | | -.0529904 | .1514085 | -0.35 | 0.726 | -.3497457 | .2437649 |
| DEFLECTION | | .0075639 | .0051582 | 1.47 | 0.143 | -.002546 | .0176739 |
| Florida | | -.5879068 | .158542 | -3.71 | 0.000 | -.8986434 | -.2771703 |
| _cons | | -10.38209 | 2.287736 | -4.54 | 0.000 | -14.86597 | -5.89821 |
| /lnalpha | | -2.793322 | .3145283 | -8.88 | 0.000 | -3.409786 | -2.176858 |
| Location | | ||||||
| var(_cons) | | .2162566 | .0420769 | .1476902 | .3166556 | ||
LR test vs. nbinomial regression: chibar2 (01) = 112.31 Prob> = chibar2 = 0.0000 |
||||||
| Fatal + Injury Crashes | ||||||
|---|---|---|---|---|---|---|
| Mixed-effects nbinomial regression | Number of obs = | 516 | ||||
| Group variable: Location | Number of groups = | 104 | ||||
| Wald chi2 (19) = | 69.20 | |||||
| Log likelihood = -795.8822 | Prob > chi2 = | 0.0000 | ||||
| FI | | Coef. | Std. Err. | z | P > |z| | [95% Conf. | Interval] |
| Treated | | -.1258947 | .1468064 | -0.86 | 0.391 | -.4136299 | .1618406 |
| LNAADTMaj | | .7880994 | .1538588 | 5.12 | 0.000 | .4865418 | 1.089657 |
| LNAADTMin | | .1330427 | .0530407 | 2.51 | 0.012 | .0290847 | .2370006 |
| | | ||||||
| THRU_SPEED | | ||||||
| 30 | | .3913529 | .6747264 | 0.58 | 0.562 | -.9310865 | 1.713792 |
| 35 | | .2297819 | .6552667 | 0.35 | 0.726 | -1.054517 | 1.514081 |
| 40 | | .5284284 | .6771754 | 0.78 | 0.435 | -.7988111 | 1.855668 |
| 45 | | .6428837 | .6733534 | 0.95 | 0.340 | -.6768647 | 1.962632 |
| 50 | | .2340186 | .7384256 | 0.32 | 0.751 | -1.213269 | 1.681306 |
| 55 | | 1.067968 | .7230297 | 1.48 | 0.140 | -.3491446 | 2.48508 |
| 60 | | .0281176 | 1.067012 | 0.03 | 0.979 | -2.063187 | 2.119422 |
| | | ||||||
| INT_SPEED | | ||||||
| 25 | | .3085697 | .4771768 | 0.65 | 0.518 | -.6266796 | 1.243819 |
| 30 | | .4888562 | .4565184 | 1.07 | 0.284 | -.4059034 | 1.383616 |
| 35 | | .3264459 | .46244 | 0.71 | 0.480 | -.5799198 | 1.232812 |
| 40 | | .5251068 | .5007958 | 1.05 | 0.294 | -.4564349 | 1.506648 |
| 45 | | .4338082 | .4880265 | 0.89 | 0.374 | -.5227062 | 1.390323 |
| 55 | | .5979823 | .5404798 | 1.11 | 0.269 | -.4613386 | 1.657303 |
| | | ||||||
| THRU_LW | | .0928152 | .1228663 | 0.76 | 0.450 | -.1479983 | .3336287 |
| ThruLane5Up | | -.3819944 | .2096644 | -1.82 | 0.068 | -.7929291 | .0289403 |
| FRTH_LEG | | -.191284 | .1558754 | -1.23 | 0.220 | -.4967942 | .1142263 |
| DEFLECTION | | .0018598 | .0053054 | 0.35 | 0.726 | -.0085386 | .0122583 |
| Florida | | -.2244251 | .1642601 | -1.37 | 0.172 | -.546369 | .0975188 |
| _cons | | -10.22665 | 2.353285 | -4.35 | 0.000 | -14.839 | -5.614294 |
| Location | | ||||||
| var(_cons) | | .15825 | .0429838 | .0929268 | .2694924 | ||
LR test vs. nbinomial regression: chibar2 (01) = 33.71 Prob> = chibar2 = 0.0000 |
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| Target Crashes | ||||||
|---|---|---|---|---|---|---|
| Mixed-effects nbinomial regression | Number of obs = | 515 | ||||
| Overdispersion: mean | ||||||
| Group variable: Location | Number of groups = | 104 | ||||
| Wald chi2 (19) = | 161.72 | |||||
| Log likelihood = -960.89489 | Prob > chi2 = | 0.0000 | ||||
| Target | | Coef. | Std. Err. | z | P > |z| | [95% Conf. | Interval] |
| Treated | | -.1857775 | .1645152 | -1.13 | 0.259 | -.5082214 | .1366663 |
| LNAADTMaj | | .9044383 | .1715841 | 5.27 | 0.000 | .5681397 | 1.240737 |
| LNAADTMin | | .1174335 | .059866 | 1.96 | 0.050 | .0000983 | .2347687 |
| | | ||||||
| THRU_SPEED | | ||||||
| 30 | | 1.081438 | .9507476 | 1.14 | 0.255 | -.7819933 | 2.944869 |
| 35 | | 1.167648 | .9267098 | 1.26 | 0.208 | -.6486698 | 2.983966 |
| 40 | | 1.464637 | .9456078 | 1.55 | 0.121 | -.3887202 | 3.317994 |
| 45 | | 1.642442 | .9423246 | 1.74 | 0.081 | -.2044807 | 3.489364 |
| 50 | | .8048887 | 1.001211 | 0.80 | 0.421 | -1.157449 | 2.767226 |
| 55 | | 1.700048 | .9904233 | 1.72 | 0.086 | -.2411461 | 3.641242 |
| 60 | | 1.461301 | 1.296715 | 1.13 | 0.260 | -1.080214 | 4.002816 |
| | | ||||||
| INT_SPEED | | ||||||
| 25 | | .394 | .5664751 | 0.70 | 0.487 | -.7162708 | 1.504271 |
| 30 | | .6714898 | .5448975 | 1.23 | 0.218 | -.3964897 | 1.739469 |
| 35 | | .6295828 | .5501377 | 1.14 | 0.252 | -.4486673 | 1.707833 |
| 40 | | .4781859 | .5966062 | 0.80 | 0.423 | -.6911408 | 1.647513 |
| 45 | | 1.09181 | .5774279 | 1.89 | 0.059 | -.0399283 | 2.223548 |
| 55 | | .967884 | .6306965 | 1.53 | 0.125 | -.2682584 | 2.204026 |
| | | ||||||
| THRU_LW | | .1072025 | .1375266 | 0.78 | 0.436 | -.1623447 | .3767496 |
| ThruLane5Up | | -.5540126 | .234327 | -2.36 | 0.018 | -1.013285 | -.09474 |
| FRTH_LEG | | .0024002 | .1702609 | 0.01 | 0.989 | -.3313051 | .3361054 |
| DEFLECTION | | .0072983 | .0057975 | 1.26 | 0.208 | -.0040647 | .0186612 |
| Florida | | -1.003687 | .1794622 | -5.59 | 0.000 | -1.355426 | -.6519472 |
| _cons | | -11.66765 | 2.713689 | -4.30 | 0.000 | -16.98638 | -6.348917 |
| /lnalpha | | -2.431527 | .3402199 | -7.15 | 0.000 | -3.098346 | -1.764709 |
| Location | | ||||||
| var(_cons) | | .2455567 | .0538776 | .1597311 | .3774975 | ||
LR test vs. nbinomial regression: chibar2 (01) = 75.34 Prob > = chibar2 = 0.0000 |
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