dougz/trueskill — pull request #3 by bhoung (2013-05-13 22:46:30+00:00)
Title: Minor tweak on sigma in PriorFactor to improve accuracy

For mu and sigma to match the values from Microsoft's trueskill calculator, sigma for PriorFactor should be square root of player's skill squared and gamma (dynamic factor) squared. See paper (Herbrich et al., first paraon page 3.), and also Heungsub Lee's version (https://github.com/sublee/trueskill/).