Polly (track)
by Nirvana
Polly appears on the following album(s) by Nirvana:
- Nevermind (track #6) (1991)
- MTV Unplugged In New York (track #7) (1994)
- From The Muddy Banks Of The Wishkah (track #14) (1996)
- With The Lights Out (track #14) (this album) (compilation) (2004)
- With The Lights Out (track #23) (this album) (compilation) (2004)
- Live At Reading (track #11) (2009)
- Live At The Paramount (track #8) (2019)
- Outcesticide (track #9) (1994)
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Polly 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).
AV = the site mean average rating.
Showing latest 5 ratings for this track. | Show all 12 ratings for this track.
| Rating | Date updated | Member | Track ratings | Avg. track rating |
|---|---|---|---|---|
| ! | 02/24/2019 05:36 |  Purplepash | 35,414 | 76/100 |
| ! | 07/06/2018 06:26 | Johnnyo | 45,052 | 80/100 |
| ! | 06/09/2017 03:53 | juanr1096 | 72,504 | 79/100 |
| ! | 03/02/2017 09:28 |  sorry1516 | 2,946 | 100/100 |
| ! | 09/04/2016 01:01 | ayowhatup | 4,499 | 63/100 |
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 73.6/100, a mean average of 71.7/100, and a trimmed mean (excluding outliers) of 71.7/100. The standard deviation for this track is 26.3.
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