From: Raymond Hettinger <rhettinger@users.noreply.github.com>
Date: Tue, 29 Apr 2025 04:05:37 +0000 (-0500)
Subject: gh-132893: Minor edits to the statistics module PR (gh-133106)
X-Git-Tag: v3.14.0b1~207
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=219b1f9d1d97e271213fe324b94ed544e890630b;p=thirdparty%2FPython%2Fcpython.git

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

diff --git a/Lib/statistics.py b/Lib/statistics.py
index 9dcb20d2a485..3d805cb07398 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 1ef651188e04..1f5a48982635 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.