Weigthed average of film is incorrect

I am writing you about the Dutch film Narcosis. The average was above an 8, and suddenly the rating dropped to 7,5, while most votes are still above an 8. If we make the calculations based on the amount of votes, the average shoudl be 8.3. Can you explain to me why the average is 7.5?

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bderoes

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3 years ago

IMDb doesn't reveal its ratings calculation, but they explain it in various help articles, listed below from search results on help.imdb.com.

Also, the number of votes for https://www.imdb.com/title/tt19837660/ratings/

is currently 121, and I believe the rating algorithm is used when the title has 100 or more votes.

Weighted Average Ratings

IMDb publishes weighted vote averages rather than raw data averages. The simplest way to explain it is that although we accept and consider all votes received by users, not all votes have the same impact (or ‘weight’) on the final rat ... Read more.

The vote average for film "X" should be Y! Why are you displaying another rating?

IMDb doesn't use the arithmetic mean when calculating the ratings, although the raw mean and median are shown under the detailed vote breakdown graph on the ratings pages. Instead we use a weighted average scheme. In order to avoid lea ... Read more.

Why doesn't a title with the average user vote of 9.4 appear in your top 250 Movies or TV list?

Updated 19-November-2021 As indicated on the IMDb Top 250 Movies and IMDb Top 250 TV Shows pages, only votes from regular IMDb voters are considered when creating the top 250 out of the full voting database. This explains any differenc ... Read more.

Ratings FAQ

Updated 15-July-2022 This article provides answers to many of the common questions asked by users in relation to IMDb's voting feature - if your question isn't listed here, our friendly IMDb Community should be able to help our further ... Read more.

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MartinYoung

Weigthed average of film is incorrect

bderoes

Weighted Average Ratings

The vote average for film "X" should be Y! Why are you displaying another rating?

Why doesn't a title with the average user vote of 9.4 appear in your top 250 Movies or TV list?

Ratings FAQ

Helpful Widget

MartinYoung

Weigthed average of film is incorrect

bderoes

Weighted Average Ratings

The vote average for film "X" should be Y! Why are you displaying another rating?

Why doesn't a title with the average user vote of 9.4 appear in your top 250 Movies or TV list?

Ratings FAQ

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