I'm trying to learn about glicko 2 rating system . In that document, there is a formula in step 5, point 2 that says $B = a - k\sqrt{\tau^2}$ Can anyone explain what is the point of squaring the tau, then getting its root again?
Glicko 2 Formula
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algorithms
1 Answers
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$\sqrt{\tau^2}=|\tau|$ $ { } $$ { } $$ { } $
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0Alright, thanks. I was worried that I missed something out, because the value of tau is supposed to be between 0.3 and 1.2, and they have used || to indicate absolute elsewhere. – 2012-10-05