Table 1.
Analysis of deviance table for number of traffic accidents. Poisson model with log-link function. Traffic intensity is included as background, and effect of year is modeled by using natural splines with d f = 4.
| d f | Estimate | Deviance | Residual d f | Residual Deviance | P(>|χ|) | |
|---|---|---|---|---|---|---|
| Season | 1 | −0.12 | 29.71 | 102 | 5103.90 | <.0001 |
| DST | 1 | −0.17 | 19.99 | 101 | 5083.92 | .8212 |
| Year | 4 | 0.26 | 1086.72 | 97 | 3997.20 | <.0001 |
| Road traffic total | 1 | −0.01 | 26.64 | 96 | 3960.56 | <.0001 |
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| Interactions | ||||||
| Season: DST | 1 | 0.05 | 26.70 | 95 | 3933.86 | <.0001 |
| DST: Year | 4 | 0.27 | 152.13 | 91 | 3781.73 | <.0001 |
| Season: Year | 4 | 0.05 | 457.86 | 87 | 3323.87 | <.0001 |