Thank you very much for the explanation. :)
Am Montag, 13. April 2015 schrieb Matthew Paul Thomas : > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > 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 > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1 > > iEYEARECAAYFAlUrlDkACgkQ6PUxNfU6ecoQRACeIRyrJFa+MvUD0DquPNJ4ptZq > 8VkAnitPUgmTjvWO4KqOiC5mnQDGKVQN > =Y8mV > -----END PGP SIGNATURE----- > > -- > Mailing list: https://launchpad.net/~ubuntu-phone > Post to : ubuntu-phone@lists.launchpad.net > Unsubscribe : https://launchpad.net/~ubuntu-phone > More help : https://help.launchpad.net/ListHelp >
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