Those Magic Changes - Sha Na Na (track)
by Various Artists
Year: 1978
From the album Grease (The Original Soundtrack From The Motion Picture) (track #13)
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Those Magic Changes - Sha Na Na ratings
Average Rating = (n ÷ (n + m)) × av + (m ÷ (n + m)) × AVwhere:
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).
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Showing latest 3 ratings for this track. | Show all 21 ratings for this track.
| Rating | Date updated | Member | Track ratings | Avg. track rating |
|---|---|---|---|---|
| ! | 06/25/2026 07:43 | stanchoiaz | 1,245 | 81/100 |
| ! | 12/08/2025 23:04 | Exist-en-ciel | 170,998 | 71/100 |
| ! | 07/08/2025 06:18 |  Igtonumama | 31,380 | 81/100 |
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 70.6/100, a mean average of 68.1/100, and a trimmed mean (excluding outliers) of 68.1/100. The standard deviation for this track is 18.0.
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