From 219b1f9d1d97e271213fe324b94ed544e890630b Mon Sep 17 00:00:00 2001 From: Raymond Hettinger Date: Mon, 28 Apr 2025 23:05:37 -0500 Subject: [PATCH] gh-132893: Minor edits to the statistics module PR (gh-133106) --- Lib/statistics.py | 3 +-- .../Library/2025-04-24-21-22-46.gh-issue-132893.KFuxZ2.rst | 2 +- 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/Lib/statistics.py b/Lib/statistics.py index 9dcb20d2a48..3d805cb0739 100644 --- a/Lib/statistics.py +++ b/Lib/statistics.py @@ -810,8 +810,7 @@ def register(*kernels): @register('normal', 'gauss') def normal_kernel(): sqrt2pi = sqrt(2 * pi) - sqrt2 = sqrt(2) - neg_sqrt2 = -sqrt2 + neg_sqrt2 = -sqrt(2) pdf = lambda t: exp(-1/2 * t * t) / sqrt2pi cdf = lambda t: 1/2 * erfc(t / neg_sqrt2) invcdf = lambda t: _normal_dist_inv_cdf(t, 0.0, 1.0) diff --git a/Misc/NEWS.d/next/Library/2025-04-24-21-22-46.gh-issue-132893.KFuxZ2.rst b/Misc/NEWS.d/next/Library/2025-04-24-21-22-46.gh-issue-132893.KFuxZ2.rst index 1ef651188e0..1f5a4898263 100644 --- a/Misc/NEWS.d/next/Library/2025-04-24-21-22-46.gh-issue-132893.KFuxZ2.rst +++ b/Misc/NEWS.d/next/Library/2025-04-24-21-22-46.gh-issue-132893.KFuxZ2.rst @@ -1 +1 @@ -Improved the accuracy of ``statistics.NormalDist.cdf`` for negative inputs. +Improved :meth:`statistics.NormalDist.cdf` accuracy for inputs smaller than the mean.