the r-dot ratings algorithm
The r-dot algorithm was developed with one thing in mind: to put people in order. It's not perfect, but it has some nice attributes that we like, namely:
- ratings are from 0.0 to 1.0;
- the average rating in a group is 0.5;
- all ratings are updated after every result;
- if you win, your rating goes up; and,
- if you lose, your rating goes down.