Search code examples
webrating

What is the most convinient and simple formula to calculate rating from views and favorites count?

I have some content on my site with two parameters: - the number of views - the number of people who added the item to theis favorites.

I want to propose some formula to combine those two parameter in some one parameter, i.e. "rating of the item".

Solution

  • There's a really good formula to calculate position in ranking, when you've got users voting for particular items.

    rating = (g / (g+m)) * s + (m / (g+m)) * S
    • s is average rating for the item
    • S is average rating for all items
    • g is number of votes for the item
    • m is a minimal number of votes for the item to be included in your ranking.

    It works really well for Filmweb.

    You'd have to modify it a little bit. Check how it would work if you counted a view of an item as rating it with 1.0 mark, and an add to favourites as 5.0. Try m = 1 at first. Possibly you'd like to change 5.0 to something like...

    rating_for_a_favourite = number_of_all_views / number_of_all_adds

    ... perhaps with some factor < 1.0.

    Try it. :-)

    Edit: Using this formula, you could easily incorporate real rating (e.g. 1-5 stars) of items to your website, besides including views and favourites into rating.