Quote:
Ratio of Odds Ratios
Ratio of odds ratios, R, is the ratio of these two odds ratios, i.e., R = R1 . The value of R
R2 represents the relative odds of daytime target crashes involvements between DRL-equipped vehicles and non-DRL vehicles.
The hypothesis is that if there were no observed DRL effects, these two odds ratios would be identical. Therefore, if DRLs had no effects on daytime target crashes, the value of R would be
1. If DRLs had a positive effect, the risk of DRL-equipped vehicles involved in the daytime target crashes would be expected to be smaller than that of non-DRL vehicles and R would be less than 1. On the contrary, if DRLs had an adverse effect, R would be greater than 1.
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Based on this statement (the formula can be found in the pdf) and the table on page viii which shows that the fatal car accidents for cars with DRL is -9.3. This means that cars with DRL actually have a 10% higher likelyhood of killing someone!
Take these out right away!!!! :P
...granted this contradicts the studies in all other 18 countries that currently have DRL laws.
