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First, one study using Amazon data has shown that many undetailed ratings (where the rater isn't required to add any additional information other than the rating they select) show a bimodal distribution. In other words the distribution of ratings tends to cluster around two different numbers (e.g., 1 and 5) rather than offering a normal distribution where the ratings cluster around a single height (e.g., 3). Thus the median of these ratings is not an accurate reflection of product quality, but instead is a statement of conflicting opinions.