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gh-132893: Minor edits to the statistics module PR (gh-133106)

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Raymond Hettinger 2025-04-28 23:05:37 -05:00 • committed by GitHub
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commit 219b1f9d1d
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2 changed files with 2 additions and 3 deletions
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Lib/statistics.py
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@ -810,8 +810,7 @@ def register(*kernels):
@register('normal', 'gauss') @register('normal', 'gauss')
def normal_kernel(): def normal_kernel():
sqrt2pi = sqrt(2 * pi) sqrt2pi = sqrt(2 * pi)
sqrt2 = sqrt(2) neg_sqrt2 = -sqrt(2)
neg_sqrt2 = -sqrt2
pdf = lambda t: exp(-1/2 * t * t) / sqrt2pi pdf = lambda t: exp(-1/2 * t * t) / sqrt2pi
cdf = lambda t: 1/2 * erfc(t / neg_sqrt2) cdf = lambda t: 1/2 * erfc(t / neg_sqrt2)
invcdf = lambda t: _normal_dist_inv_cdf(t, 0.0, 1.0) invcdf = lambda t: _normal_dist_inv_cdf(t, 0.0, 1.0)

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Misc/NEWS.d/next/Library/2025-04-24-21-22-46.gh-issue-132893.KFuxZ2.rst
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@ -1 +1 @@
Improved the accuracy of ``statistics.NormalDist.cdf`` for negative inputs. Improved :meth:`statistics.NormalDist.cdf` accuracy for inputs smaller than the mean.