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odds of crash a => 97% => 3 / 100

odds of crash for b => 99.99% => 1 / 10000

improvement (odds ratio in this case) is then 300x = odds of crash for b / odds of crash for a

That may be true at a given moment, but how about time? I usually don't care about the probability that I'll crash within the next millisecond, but I do care about the probability that I'll crash over a whole trip.

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