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An Assessment of the National Highway Traffic Safety Administration's Rating System for Rollover Resistance Special Report 265 (2002) / Chapter Skim
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Appendix C: Supplementary Statistical Results
Pages 100-103

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From page 100...
... for the Wald Chi-square statistic with 1 DF, with a value below 0.05 indicating a significant effect of the associated model parameter if a 5 percent significance level is chosen. The parameters included in the logistic model are the static stability factor (SSF)
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From page 101...
... Standard Wald Parameter DF Estimate Error Chi-Square Pr > ChiSq Intercept 1 1.5326 0.0555 762.6947 <.0001 SSF 1 -3.6027 0.0416 7510.7110 <.0001 STORM 1 -0.1910 0.0130 214.9444 <.0001 FAST 1 0.9276 0.0123 5642.4241 <.0001 HILL 1 0.1279 0.0124 106.9493 <.0001 CURVE 1 0.5224 0.0122 1844.5867 <.0001 MALE 1 -0.0913 0.0123 55.2705 <.0001 YOUNG 1 0.3187 0.0119 720.3518 <.0001 OLD 1 -0.3664 0.0405 81.6902 <.0001 DRINK 1 0.2578 0.0157 270.7577 <.0001 dummy_fl 1 1.1611 0.0214 2953.9104 <.0001 dummy_md 1 0.7852 0.0257 932.6290 <.0001 dummy_nc 1 0.8006 0.0192 1742.2279 <.0001 dummy_pa 1 1.2121 0.0200 3686.3054 <.0001 dummy_ut 1 1.4575 0.0296 2417.7396 <.0001 TABLE C-2 Logit Model Results for Data from Six States Combined for Risk Scenario Close to the Minimum (See Figure 3-3) Standard Wald Parameter DF Estimate Error Chi-Square Pr > ChiSq Intercept 1 1.0804 2.8127 0.1476 0.7009 SSF 1 -3.7387 2.0212 3.4216 0.0643 dummy_fl 1 0.7377 0.7845 0.8842 0.3470 dummy_md 1 0.5256 1.0138 0.2688 0.6042 dummy_nc 1 0.5774 0.8119 0.5058 0.4770 dummy_pa 1 0.4725 0.8263 0.3270 0.5675 dummy_ut 1 1.9178 1.2993 2.1786 0.1399
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From page 102...
... Standard Wald Parameter DF Estimate Error Chi-Square Pr > ChiSq Intercept 1 3.1380 0.3896 64.8641 <.0001 SSF 1 -4.1671 0.3083 182.6660 <.0001 dummy_fl 1 1.0949 0.1610 46.2240 <.0001 dummy_md 1 0.7980 0.1861 18.3786 <.0001 dummy_nc 1 0.4573 0.1555 8.6466 0.0033 dummy_pa 1 1.0435 0.1521 47.0791 <.0001 dummy_ut 1 1.3395 0.1965 46.4858 <.0001 TABLE C-5 Logit Model Results for Data from Six States Combined for Risk Scenario at the Median (See Figure 3-6) Standard Wald Parameter DF Estimate Error Chi-Square Pr > ChiSq Intercept 1 2.8052 0.2493 126.5779 <.0001 SSF 1 -3.9525 0.1990 394.5406 <.0001 dummy_fl 1 1.4559 0.0895 264.3365 <.0001 dummy_md 1 0.6796 0.1198 32.1621 <.0001 dummy_nc 1 0.4733 0.0885 28.6180 <.0001 dummy_pa 1 0.9663 0.0978 97.6930 <.0001 dummy_ut 1 1.8160 0.1236 215.9163 <.0001
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From page 103...
... Standard Wald Parameter DF Estimate Error Chi-Square Pr > ChiSq Intercept 1 0.7049 0.5683 1.5388 0.2148 SSF 1 -1.7458 0.4509 14.9929 0.0001 dummy_fl 1 1.5017 0.1989 56.9796 <.0001 dummy_md 1 0.3726 0.5993 0.3865 0.5342 dummy_nc 1 1.6822 0.1713 96.4075 <.0001 dummy_pa 1 0.7427 0.2205 11.3456 0.0008 dummy_ut 1 2.2298 0.4830 21.3100 <.0001
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