The IMDb Top 250 is intended to be a listing of the top 'rated' 250 films, based on ratings by the registered users of the website using the methods described. Only non-documentary theatrical releases running at least forty-five minutes with over 3000 ratings are considered; all other products are ineligible. Also, the 'top 250' rating is based on only the ratings of "regular voters". The exact number of votes a registered user would have to make to be considered to be 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". 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. 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. IMDb uses the following formula to calculate the weighted rating:
where:
= Weighted Rating
= average for the movie as a number from 0 to 10 (mean) = (Rating)
= number of votes for the movie = (votes)
= minimum votes required to be listed in the Top 250 (currently 3000)
= the mean vote across the whole report (currently 6.9)
An extended listing of the Top 500 – following the same formula – is available to IMDbPro subscribers.
The IMDb also has a Bottom 100 feature which is assembled through a similar process although only 1500 votes must be received to qualify for the list.
The top 250 list comprises a wide range of films, including major releases, cult films, independent films, critically acclaimed films, silent films and non-English language films.
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