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Title: bpo-20499: Rounding error in statistics.pvariance by rhettinger · Pull Request #28230 · python/cpython · GitHub

Open Graph Title: bpo-20499: Rounding error in statistics.pvariance by rhettinger · Pull Request #28230 · python/cpython

X Title: bpo-20499: Rounding error in statistics.pvariance by rhettinger · Pull Request #28230 · python/cpython

Description: Make the _ss() function exact. Also improve the speed: $ python -m timeit -r 11 -s 'from statistics import variance' -s 'from random import random, seed' -s 'seed(8564399)' -s 'data = [random() for i in range(1_000)]' 'variance(data)' 100 loops, best of 11: 2.16 msec per loop # Baseline 200 loops, best of 11: 1.71 msec per loop # Patched https://bugs.python.org/issue20499

Open Graph Description: Make the _ss() function exact. Also improve the speed: $ python -m timeit -r 11 -s 'from statistics import variance' -s 'from random import random, seed' -s 'seed(8564399)' ...

X Description: Make the _ss() function exact. Also improve the speed: $ python -m timeit -r 11 -s 'from statistics import variance' -s 'from random import random, seed' -s &#39...

Opengraph URL: https://github.com/python/cpython/pull/28230

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bpo-20499: Rounding error in statistics.pvariance https://github.com/python/cpython/pull/28230/files#top
Show all changes 12 commits https://github.com/python/cpython/pull/28230/files
0a1d350 Incorrect first draft rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/0a1d35050453aeda84c42c5acf1cfa326ed837d0
d8714cc Exact ss rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/d8714ccde4e13b382c6fef76881fb3460f127461
2108d4d Add test rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/2108d4dfd76cb11112500c14f3c644630adc1de8
da6c6cb Add blurb rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/da6c6cb8712697f0510c6c7066f5253af76b448d
69387c6 Remove superfluous comment rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/69387c6d6fa205c38fe44f9a58781cbc3f6425c0
39973fd Add another test rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/39973fd60a04c0feebeeaed59b882168213ab87b
829d5ec Improve clairity rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/829d5ecd8318243d905e79751d71a5d428de6329
cc78aaf Beautify the order of terms rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/cc78aaf86d6818e5aafaee4353babea614bb5c60
c0b1560 Removed unused "start" argument from internal function rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/c0b156043308baef9f3115e6031444defcce1895
c746482 Modernize and speed-up _exact_ratio() internal function rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/c74648287fa56bbe5755b23df600b0cb4f246951
e7c46fa Remove unnecessary sort rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/e7c46fa5b93e117dbedc6e184ad797835c34ffd0
117ad6b Add accuracy comments to stdev() and pstdev(). rhettinger Sep 8, 2021 https://github.com/python/cpython/pull/28230/commits/117ad6b0d7cb52b2808d2a9ada87afee7a0e8924
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