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Old June 5 2012, 11:12 PM   #1
Miss Chicken
Little three legged cat with attitude
Miss Chicken's Avatar
Location: Howrah, Hobart, Tasmania
Question about IMDB

Does anyone worked out how they reach the "weighted average" of a movie on Internet Movie Database? Do you think the 'weighted average" is a fair indication of how good a movie is?

I just looked up one of my favourite movies, Orphans, on IMDB. Its averages are as follows. (after being rated by 523 users)

Median - 8
Arithmetic mean - 7.5
Weighted average - 6.5

On Amazon this movie gets 5 stars after 19 people rated it 5 stars and 2 people rated it 3 stars.
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Old June 5 2012, 11:46 PM   #2
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Location: Kingston, Ontario, Canada
Re: Question about IMDB

The weighted mean is some formula to try and prevent the rating from being hijacked, though they're quite secretive about how it works in order to prevent people from trying to work around it.
"I'm a white male, age 18 to 49. Everyone listens to me, no matter how dumb my suggestions are!"

- Homer Simpson
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Old June 6 2012, 12:27 AM   #3
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Re: Question about IMDB

The formula can be found on the IMDB page on Wikipedia, although there are certain aspects of the calculation (i.e. how active a user must be to be considered a regular voter) that are kept secret:
"This begs explanation." - de Forest Research on Star Trek

My blog: Star Trek Fact Check.
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