.where x-bar is ((the average number of stars) - 1) / 4, and the final score is 1 + 4 * (the result of the formula).
| Item | Value | Description |
|---|---|---|
| Total number of votes | 1 | This value will be seen by users in the problem page. |
| Average value | 5 | This value will be seen by users in the problem page. |
| Score (lower bound) | 1.8261731658956 | This value will be used to order problems in highest rated list. |
| Score (upper bound) | 5 | (not used) |
The score is calculated by Wilson score confidence interval (http://www.evanmiller.org/how-not-to-sort-by-average-rating.html) with 95% of confidence:
.
where x-bar is ((the average number of stars) - 1) / 4, and the final score is 1 + 4 * (the result of the formula).
The old formula was used until Apr 30, 2012. Thanks to Margus for the correction and logical explanation!