User ratings of films
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As one adjunct to data, the IMDb offers a rating scale that allows users to rate titles on a scale of one to ten.
IMDb indicates that submitted ratings are filtered and weighted in various ways to produce a weighted mean that is displayed for each title. It states that filters are used to deter ballot stuffing; the methodology and details for how its ratings are calculated are confidential and not accessible to the public. In fact, it sometimes produces an extreme difference between the weighted average and the arithmetic mean.