[issue45876] Improve accuracy of stdev functions in statistics

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Here's a reference for this use of round-to-odd: https://www.lri.fr/~melquion/doc/05-imacs17_1-expose.pdf

I'm happy to provide any proofs that anyone feels are needed.

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<https://bugs.python.org/issue45876>
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