search

bhdouglass / uappexplorer

Moved to GitLab
https://gitlab.com/bhdouglass/uappexplorer
GNU General Public License v3.0
42 stars 5 forks source link

Star rating incorrect - (4 + 5) / 2 = 3,77 #71

Closed weeman1337 closed 8 years ago

weeman1337 commented 8 years ago

The star rating seems to be incorrect. #14 says "The star rating comes from the API. It may be wrong, so I calculate it by myself.". As you see in th attached screenshot, there are two ratings: 4 and 5. Here I'm expecting (4 + 5) / 2 = 4,5 star rating. But it displays 3,77.

You can check it currently on https://uappexplorer.com/app/eu.michael-weimann.stock-n-roll

screenshot from 2016-02-26 19-25-52

bhdouglass commented 8 years ago

The star rating isn't actually a strict average of the star ratings, it's a Bayesian average of the ratings. From the FAQ:

The star rating is the Bayesian average of the star ratings that user give to an app when they leave a review. The Bayesian average allows apps with more reviews to rank better than apps with less reviews. The star rating can be between 1 and 5, where a 0 means that there have not been any reviews yet.

So it is expected that your math doesn't add up.

weeman1337 commented 8 years ago

Should have read the FAQs. But who does...? ;) Just saw the two ratings and the calculated rating and it didn't fit for my feeling... If this request comes up from time to time, may it be an idea to place e.g. a little exclamation symbol there with a tooltip/link to the FAQ item?

Anyway excellent response time for an issue! Thanks

bhdouglass commented 8 years ago

Haha while answering you that thought did cross my mind. It might be a worthwhile addition.