ubuntu-phone team mailing list archive

[Selene Scriven <selene.scriven@xxxxxxxxxxxxx>]

* Rodney Dawes <rodney.dawes@xxxxxxxxxxxxx> wrote:
> We would just need to also do something for apps with no 
> ratings at all, so they will get weighted better than apps that 
> have all negative ratings.

It's pretty simple.  Default to a score of 50% (3 stars?), and 
adjust that score up or down based on ratings.  Adjust up/down 
farther when an app has lots of good ratings or lots of bad 
ratings, because more ratings allows for more certainty.

I generally do this by normalizing into a range of -1.0 to +1.0, 
doing all the math in that space, then re-adjusting it to the 
scale used for display (1 star to 5 stars).  This makes 
center-default scores easy to calculate.


-- Selene