Re:New Research on How Ride-Hailing Impacts Travel Behavior
by thaumasiotes on Sunday October 15, 2017 @05:34PM
(#15479423)
> GP's post is just a single datum, of course, but it's enough in itself to raise doubt about the accuracy of that 1.7/megatrip statistic.
In itself it's not that great. You have two obvious options:
1. Robberies on BART are generally not reported. You'd need a very high rate of nonreporting to mess with the conclusion that overall BART trips are quite safe.
2. Certain BART trips, by location, time of day, or some other metric, are much more dangerous than the average, and the BART-using public preferentially avoids taking those trips.
If you believe in case 2, it's not at all surprising that someone might know several people who have been robbed on BART. You'd conclude that their social circle has atypical BART habits. How many robberies-at-gunpoint do you think occur in the packed rush hour trains?
In itself it's not that great. You have two obvious options:
1. Robberies on BART are generally not reported. You'd need a very high rate of nonreporting to mess with the conclusion that overall BART trips are quite safe.
2. Certain BART trips, by location, time of day, or some other metric, are much more dangerous than the average, and the BART-using public preferentially avoids taking those trips.
If you believe in case 2, it's not at all surprising that someone might know several people who have been robbed on BART. You'd conclude that their social circle has atypical BART habits. How many robberies-at-gunpoint do you think occur in the packed rush hour trains?