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@muratk3n I think you're right: mean = 1, so we have (-1)²+0²+1²=2. Sqrt of 2/2 = 1, Sqrt of 2/3 = 0.816. Pandas's right, tho.

@muratk3n a Prof of mine used to explain it like this: "Why n - 1? Because estimating the mean consumes one degree of freedom." #huh