Comment by topaz0
They use the area under the receiver operating curve, which is a pretty standard way to boil that down to one number.
They use the area under the receiver operating curve, which is a pretty standard way to boil that down to one number.
Ah, thanks for the pointer!
https://en.m.wikipedia.org/wiki/Receiver_operating_character...
So, 83% is actually not that great, given that you can achieve 50% by guessing randomly.