Weighted Average and Ratings

Posted by Danten on Stack Overflow See other posts from Stack Overflow or by Danten
Published on 2010-04-04T19:32:09Z Indexed on 2010/04/04 19:33 UTC
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weighted-average

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bayesian

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average

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rating

Maths isn't my strong point and I'm at a loss here.

Basically, all I need is a simple formula that will give a weighted rating on a scale of 1 to 5. If there are very few votes, they carry less influence and the rating pressess more towards the average (in this case I want it to be 3, not the average of all other ratings).

I've tried a few different bayesian implementations but these haven't worked out. I believe the graphical representation I am looking for could be shown as:

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    /
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Cheers

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