Table 2
Fixed effect negative binomial regressions
|
Dependent Variable |
Total Fatalities |
Serious Injuries |
Slight Injuries | |||||||||
|
______a______ |
_______B______ |
_______C_______ |
______D______ |
_______E_______ |
_______F_______ | |||||||
|
Variables |
Coef. |
t-stat |
Coef. |
t-stat |
Coef. |
t-stat |
Coef. |
t-stat |
Coef. |
t-stat |
Coef. |
t-stat |
|
ln(average vehicle age) |
-0.362 |
-2.64 |
-0.295 |
-1.66 |
0.471 |
2.20 |
0.466 |
2.36 |
-0.029 |
-0.27 |
0.046 |
0.42 |
|
ln(% network miles of motorway & trunk road) |
-0.134 |
-0.55 |
-0.158 |
-0.56 |
0.565 |
2.66 |
0.499 |
1.72 |
0.457 |
2.78 |
0.166 |
0.99 |
|
ln(% network miles of other roads) |
0.047 |
0.48 |
-0.007 |
-0.07 |
-0.458 |
-3.67 |
-0.516 |
-4.63 |
0.062 |
1.04 |
0.070 |
1.36 |
|
ln(Motorway length per square km of area) |
0.008 |
0.10 |
-0.195 |
-1.80 |
-0.182 |
-3.78 |
-0.130 |
-1.28 |
-0.151 |
-2.38 |
-0.068 |
-1.17 |
|
ln(Trunk road length per square km of area |
0.115 |
0.66 |
0.133 |
0.68 |
-0.144 |
-0.79 |
-0.195 |
-0.90 |
-0.418 |
-3.63 |
-0.114 |
-0.95 |
|
ln(Vehicles per thousand population) |
0.047 |
1.31 |
0.053 |
1.04 |
0.027 |
0.61 |
0.063 |
1.28 |
0.023 |
0.64 |
0.003 |
0.09 |
|
ln(% of household having no car) |
0.108 |
1.09 |
0.131 |
1.38 |
0.143 |
1.25 |
0.147 |
1.39 |
-0.131 |
-1.85 |
-0.016 |
-0.27 |
|
ln(GDP £ per capita 1998 £)_______________________ |
0.062 |
0.27 |
0.259 |
1.17 |
0.030 |
0.11 |
-0.605 |
-2.36 |
-0.367 |
-2.14 |
-0.203 |
-1.35 |
|
ln(Per capita expenditure on alcohol, 1998 £) |
0.395 |
4.09 |
0.223 |
2.24 |
0.408 |
3.86 |
0.441 |
4.42 |
0.210 |
2.92 |
0.118 |
1.89 |
|
ln(Average length of inpatient stay in the hospital) |
0.283 |
2.48 |
-0.449 |
-3.41 |
-0.157 |
-2.16 | ||||||
|
ln(NHS staff per thousand population) |
-0.090 |
-1.57 |
0.194 |
2.98 |
0.160 |
3.69 | ||||||
|
ln(Persons waiting for hospital treatment) |
0.138 |
2.18 |
-0.159 |
-2.32 |
0.000 |
0.00 | ||||||
|
ln(Total population) |
0.079 |
1.16 |
-0.050 |
-0.52 |
0.305 |
3.60 |
0.607 |
6.08 |
0.101 |
1.89 |
0.231 |
3.44 |
|
ln(% population age 0-14) |
-0.245 |
-0.92 |
-0.294 |
-1.07 |
0.156 |
0.46 |
0.004 |
0.01 |
0.210 |
1.01 |
0.297 |
1.66 |
|
ln(% population age 15-24) |
0.063 |
0.67 |
0.064 |
0.64 |
0.212 |
1.73 |
0.074 |
0.64 |
0.149 |
2.00 |
0.166 |
2.60 |
|
ln(% population age 25-44) |
-0.131 |
-0.61 |
0.158 |
0.70 |
-0.460 |
-1.82 |
-0.314 |
-1.34 |
-0.238 |
-1.41 |
-0.050 |
-0.33 |
|
ln(% population age 45-64) |
0.164 |
0.68 |
-0.376 |
-1.48 |
-1.901 |
-6.78 |
-1.314 |
-4.76 |
-0.336 |
-1.54 |
-0.572 |
-3.43 |
|
ln(% population age 65 or over) |
0.615 |
2.91 |
0.562 |
2.37 |
0.587 |
2.15 |
0.443 |
1.64 |
0.358 |
2.25 |
-0.141 |
-0.89 |
|
constant |
2.271 |
0.64 |
5.974 |
1.50 |
-2.503 |
-0.59 |
-0.422 |
-0.09 |
3.179 |
1.16 |
3.368 |
1.43 |
|
Number of observations |
200 |
180 |
______200 |
_______180 |
______200 |
_______180 | ||||||
|
Log likelihood function at convergence |
-858.930 |
-756.541 |
-1367.160 |
-1194.350 |
-1553.930 |
-1341.510 | ||||||
|
Log likelihood function at zero |
-1207.726 |
-1207.726 |
-1787.880 |
-1787.880 |
-1858.280 |
-1858.280 | ||||||
|
Log likelihood ratio index |
0.289 |
0.374 |
0.235 |
0.332 |
0.164 |
0.278 | ||||||
* year dummy variables are not shown for brevity
24
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