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Normalizing Ratings

What rating should you give the driver who just dropped you at your door via Uber or Lyft.  Well, unless they messed up in some noticeable ...

And then you have Eastern Europeans who are reputed to tend to give low ratings except when service is unusually good. Normally this doesn't matter too much unless you're an American Uber driver who happens to get a Japanese rider who sinks your rating with a 3, but it can have worse consequences. I'd like to be able to give a 5 for exceptional service on Uber but when a 4 is a punishment then I can't do that in good faith.

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