ELO och TrueSkill

Hejsan, jag har en fråga gällande ELO och TrueSkill när det kommer till ratings. På TrueSkills hemsida http://research.microsoft.com/en-us/projects/trueskill/detail... säger dom såhär:

"Rather than assuming a single fixed skill for each player, the system characterises its belief using a bell-curve belief distribution (also referred to as Gaussian) which is uniquely described by its mean μ (speak [mju:]) (“peak point”) and standard deviation σ (speak [sigma])(“spread”). An exemplary belief is shown in the figure on the right. Note that the area under the skill belief distribution curve within a certain range corresponds to the belief that the player’s skill will lie in that range. For example, the green area in the figure on the right is the belief that the player's skill is within level 15 and 20. As the system learns more about a player’s skill, σ has the tendency to become smaller, more tightly bracketing that player’s skill. Another way of thinking about the μ and σ values is to consider them as the “average player skill belief” and the “uncertainty” associated with that assessment of their skill."

Betyder detta alltså att ELO systemet som används i League of Legends endast använder sig utav "μ" för att räkna ut ens rating? Mycket möjligt att jag hittade till fel tråd..