General Question

hosa's avatar

How does IMDB rate movies?

Asked by hosa (150points) August 11th, 2019

My question is, on what basis exactly does IMDB give its ratings to movies? because I thought it was the culmination of users votes that determines the final score, but I must be wrong.. why?
Because newly released Boxoffice movies have a high score, but if you go through the people’s reviews you will find that most of them gave it a very low score..example?.. Toy Story 4

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2 Answers

filmfann's avatar

User ratings.
This is different than user reviews. I rated the movie as an 8.

ttppll33's avatar

User ratings of films
As one adjunct to data, the IMDb offers a rating scale that allows users to rate films on a scale of one to ten. It has been alleged that the rating system is flawed, for several reasons.[32]

IMDb indicates that submitted ratings are filtered and weighted in various ways in order to produce a weighted mean that is displayed for each film, series, and so on. It states that filters are used to avoid ballot stuffing; the method is not described in detail to avoid attempts to circumvent it. In fact, it sometimes produces an extreme difference between the weighted average and the arithmetic mean.

The IMDb Top 250 is a list of the top rated 250 films, based on ratings by the registered users of the website using the methods described. As of 7 February 2019, The Shawshank Redemption is #1 on the list.[33] The “Top 250” rating is based on only the ratings of “regular voters”. The number of votes a registered user would have to make to be considered as a user who votes regularly has been kept secret. IMDb has stated that to maintain the effectiveness of the Top 250 list they “deliberately do not disclose the criteria used for a person to be counted as a regular voter”.[34] In addition to other weightings, the Top 250 films are also based on a weighted rating formula referred to in actuarial science as a credibility formula.[35] This label arises because a statistic is taken to be more credible the greater the number of individual pieces of information; in this case from eligible users who submit ratings. Although the current formula is not disclosed, IMDb originally used the following formula to calculate their weighted rating:[36][37]

w= (R*v + C*m) / (V + m)

W\ = weighted rating
R\ = average for the movie as a number from 1 to 10 (mean) = (Rating)
v\ = number of votes for the movie = (votes)
m\ = minimum votes required to be listed in the Top 250 (currently 25,000)
C\ = the mean vote across the whole report (currently 7.0)

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