Alexander Belopolsky added the comment: > By the way, why does Python use ROUND_HALF_EVEN for round()?
ROUND_HALF_EVEN does not introduce statistical bias in your floating point data. With this choice a randomly chosen decimal has an equal chance of being rounded up or down. I think one can prove the same for a binary float being converted to a decimal with a fixed number of places after dot. The builtin round() is a unique beast and I would have to ask Mark to know what its statistical properties are, but in general round-half-to-even is justified by the desire of not introducing a statistical bias and I don't think the natural asymmetry of the time line matters in this argument. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23517> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
