TrueSkill is a rating system designed by Microsoft for use in online games.
This implementation of TrueSkill uses the following variables;
TrueSkill works by tracking the mean rating of players alongside the uncretainty in player skill. Using these two variables, a conservative estimate of skill rating can be produced.
The more certain the rating system is of a skill rating, the less it will change over time, the more certain, the faster it will change. The certainty increases with consistent results from a given fighter.
These ratings exclude fighters who have not fought within the last 18 months.
Please be aware that these ratings are calculated pound-for-pound, not per weight class. Fighters who recently switched weight class have ratings based primarily on having competed in their previous class and are not adjusted to their new class.