Oh yeah I can see it, that would make sense! Thanks!
Since a lot of tickets will be bought anonymously you can’t easily count unique users of the subway system, so the raw data probably consisted of numbers of homicides, and number of rides taken by all customers combined.
But the rate between those wouldn’t fit the per person risk they want to be comparing. So to calculate a risk to a person they must have assumed a realistic case towards the higher end of ridership, that is, a commuter commuting 5 days a week for 50 weeks a year, to work and back, that would give the 500 rides number.
Oh yeah I can see it, that would make sense! Thanks!
Since a lot of tickets will be bought anonymously you can’t easily count unique users of the subway system, so the raw data probably consisted of numbers of homicides, and number of rides taken by all customers combined.
But the rate between those wouldn’t fit the per person risk they want to be comparing. So to calculate a risk to a person they must have assumed a realistic case towards the higher end of ridership, that is, a commuter commuting 5 days a week for 50 weeks a year, to work and back, that would give the 500 rides number.