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You are correct that star ratings are limited, but they are still useful as a rough guide of quality. On Amazon, I can tell which products I should probably avoid, and which are worth investigating more from the number of stars. On IMDB, I can tell whether a movie is likely to be broadly good or terrible. It's true that I can't gather more fine-grained ...


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Why stars in amazon : In amazon it's just a way to assure the user whether the product is god or bad. A star rating on the higher side ( say above 3 with a large number of ratings ) can give a belief to the user that the item has been used by many people and is decent enough to use. One person's 3 and other person's 3 might be different , but still they ...



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