Amazon was catalogued by the UXP2 Lab over the way it presents star ratings on products. According to the entry, Amazon does not show the true average of the star ratings, but instead uses machine learning to calculate the displayed rating while taking certain factors into account.
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Amazon: Deceptive Ratings.
“Amazon doesn’t actually show the real average in their star ratings on products, they use machine learning to calculate the ratings while taking into account certain factors.”