My friend made a fantastic quiz based on a buttload of data where machine learning predicts what gender you are. I'm surprised it thought so strongly that I was male!
programs.clearerthinking.org/gender_continu
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The gender differences on the answers of each question were all small, except for the two questions about how often do you think about sex. The differences for those were huge.
As a result, the algorithm is confused by sex workers.
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