Blue Moon - Sha Na Na (track)
by Various Artists
Year: 1978
From the album Grease (The Original Soundtrack From The Motion Picture) (track #11)
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Blue Moon - Sha Na Na ratings
where:
av = trimmed mean average rating an item has currently received.
n = number of ratings an item has currently received.
m = minimum number of ratings required for an item to appear in a 'top-rated' chart (currently 10).
AV = the site mean average rating.
| Rating | Date updated | Member | Track ratings | Avg. track rating |
|---|---|---|---|---|
85/100  | 07/08/2025 06:18 |  Igtonumama | | 81/100 |
80/100 | 07/13/2024 05:58 |  Tamthebam | | 79/100 |
75/100 | 10/11/2023 21:13 | mrmcrook | | 79/100 |
75/100 | 09/04/2023 05:29 | culwin | | 75/100 |
80/100 | 08/10/2022 02:40 | matterhornrider | | 86/100 |
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 74.0/100, a mean average of 73.0/100, and a trimmed mean (excluding outliers) of 73.0/100. The standard deviation for this track is 17.7.
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