Equal to the square root of the mean (lambda)
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what is sigma Informational
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- Sum of first n cubes What is the closed-form expression for Σ i from 1 to n?
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- Identifying outliers and assessing reliability What are player ratings systems (e.g., Elo rating in chess), and how might they implicitly or explicitly consider sigma (variability in game outcomes)?
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- n(n+1)(2n+1)/6
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