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Why do the front page and other top listings have strange numbering?
Up to Table of ContentsThis FAQ applies to: Any version.
In fact, they do.
Planbooktravel uses a complex algorithm that looks up the ratings, the amount of ratings, and other factors to rank items accordingly. Otherwise, you would get an item ranked by it's owner, suddenly at the top of the list, over an item rated 4 by 2000 people!
The algorithm changes, thus the numbers may change slightly as the site grows. You will find that items that have been ranked by a number of people, and highly, will rank above others on average. Of course there are other factors that are associated with the rankings, but to sum up our algorithm :
b(r) = [ W(a) * a + W(r) * r ] / (W(a) + W(r)]
r = average rating for an item
W(r) = weight of that rating, which is the number of ratings
a = average rating for the collection
W(a) = weight of that average, which is an arbitrary number, higher as we have more ratings for items
b(r) = new bayesian rating
see also:
-
What do the star ratings represent?
- How do I work out what the star ratings represent, and the best way to organise how I rate content?
