ubuntu-phone team mailing list archive

[Niklas Wenzel <nikwen.developer@xxxxxxxxx>]

Thank you very much for the explanation. :)

Am Montag, 13. April 2015 schrieb Matthew Paul Thomas :
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> Martin Albisetti wrote on 09/04/15 13:38:
>> ...
>>
>> There are a lot of good points about people gaming the system and
>> problems with different approaches. Luckily, this is not a new
>> problem at all. In fact, it's not even new to Ubuntu!  Matthew
>> Paul Thomas spent some time thinking about this years ago and put
>> together a great wiki page[1]. Which points to a great post on how
>> to avoid the most common problems:
>> http://www.evanmiller.org/how-not-to-sort-by-average-rating.html
>>
>> ...
>
> The sorting algorithm we ended up with is described in the main USC
> specification. <https://wiki.ubuntu.com/SoftwareCenter#top-rated>
>
> "An item’s dampened rating (DR) should be 3 plus the sum, for each
> possible number of stars (1, 2, 3, 4, and 5), of (that number of stars
> – 3) multiplied by the lower bound of the Wilson score confidence
> interval with a 90% confidence level for the proportion of ratings
> that had that number of stars."
>
> This is similar to Selene's suggestion. It avoids messing with the
> displayed rating -- an item with only two reviews, both 5-star, will
> show an average rating of 5 stars, so people don't think the average
> is broken. But that item will sort below an item that has nine 5-star
> ratings and one 4-star rating, even though the raw average is higher.
> This is more understandable, because sorting can also be influenced by
> other factors as Martin mentioned -- popularity, usage, crashiness,
> serendipity, and so on.
>
> - --
> mpt
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