John The Revelator - 'Blind' Willie Johnson (track)
by Various Artists

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Anthology Of American Folk Music (84 tracks)

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   Average Rating = (n ÷ (n + m)) × av + (m ÷ (n + m)) × AV
where:
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Rating metrics: Outliers can be removed when calculating a mean average to dampen the effects of ratings outside the normal distribution. This figure is provided as the trimmed mean. A high standard deviation can be legitimate, but can sometimes indicate 'gaming' is occurring. Consider a simplified example* of an item receiving ratings of 100, 50, & 0. The mean average rating would be 50. However, ratings of 55, 50 & 45 could also result in the same average. The second average might be more trusted because there is more consensus around a particular rating (a lower deviation).
(*In practice, some tracks can have several thousand ratings)
This track has a Bayesian average rating of 76.5/100, a mean average of 76.9/100, and a trimmed mean (excluding outliers) of 76.9/100. The standard deviation for this track is 12.4.

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