Tom Forth @tomforth.co.uk · Aug 18

They have definitely done something odd given that the number of journeys from Leeds to Birmingham New Street is precisely the same as the number of journeys from Birmingham New Street to Leeds. That's consistent across all the data and it can't be the result of using only ticket sale data.

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eine Kugel wolf. Im Wafel · Aug 18

They take ticket sales data, double it up and then divide by two. And then convert to integers. They've done that for years (forever?). Picking out return tickets from singles in LENNON would be more error prone