3 Messages

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90 Points

Sat, Nov 21, 2020 1:04 PM

# Unusual Disparity Weighted Average Vote, Arithmetic Mean and Median

Hello,

I do understand there is a difference between the Weighted Average Vote, the Arithmetic one, and the Median.

* However*, this title had an average varying from 7 to 8 for months.

Link: *https://www.imdb.com/title/tt8829176/ratings?ref_=tt_ov_rt*

Its weighted average recently dropped from 7.5 to 3.9

Weighted Average: 3,9

Arithmetic: 7,5

Median: 7

Out of 115 votes:

-there are 8 votes at 1/10 and 1 vote at 3/10

-All the other votes are above 7

-There are 108 between 7 and 10

Regardless of the algorithm's easy justification, how can one mathematically/rationally justify that?

Do the 8 votes at 1/10 weigh 10 times more than all the 7,8 and 9?

Why did it go from 7 to 3 ** without any vote below 2** added over the past few months?

No need to send me back to the FAQ, I read it all.

It just doesn't add up for this particular case.

8 bad votes can't cancel 100 good ones, gradually added over the last two years.

Thanks!

N.C.C

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7 days ago

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## Karen_P

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11 days ago

John.

Hi

The weighted average formula does not actually get used "Until" a title gets to 100 votes.

That is why it had the sharp drop.

So there is no "Unusual Disparity" It would be nice if the formula was used starting with the first few votes. But I've read here that it won't function, or it will give really high or low numbers if used any earlier than 100.

Thanks.

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