Birthday (track) by Katy Perry
Birthday appears on the following album(s) by Katy Perry:
- PRISM (track #3) (this album) (2013)
Upcoming concerts
Listen to Birthday on YouTube
Birthday 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 |
|---|---|---|---|---|
65/100  | 02/11/2025 16:16 | daCritic | | 76/100 |
30/100 | 03/23/2024 20:32 |  DommeDamian | | 51/100 |
80/100 | 06/10/2023 01:07 | alexandermause | | 85/100 |
50/100 | 04/22/2023 15:03 | pinkfreud1981 | | 71/100 |
65/100 | 04/25/2020 16:27 | LosWochos | | 80/100 |
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 63.3/100, a mean average of 58.8/100, and a trimmed mean (excluding outliers) of 58.8/100. The standard deviation for this track is 21.7.
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Birthday comments
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Nope
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