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GH-102670: Use sumprod() to simplify, speed up, and improve accuracy of statistics functions #102649

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Merged
rhettinger merged 11 commits into from
Mar 14, 2023
Merged

GH-102670: Use sumprod() to simplify, speed up, and improve accuracy of statistics functions #102649

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3f2fd8d
Use sumprod() to speed-up and improve accuracy of correlation()
rhettinger Mar 13, 2023
3241045
Only compute differences once
rhettinger Mar 13, 2023
52c7584
Use sumprod() in covariance().
rhettinger Mar 13, 2023
16b2745
Use sumprod() in linear_regression().
rhettinger Mar 13, 2023
b9eeee5
Can skip centering if xbar or ybar is already zero
rhettinger Mar 13, 2023
c51e520
Factor-out common logic in linear_regression
rhettinger Mar 13, 2023
39be9f8
Factor-out common logic in linear_regression
rhettinger Mar 13, 2023
a448615
Use generator for y array in linear_regression()
rhettinger Mar 13, 2023
c9a4e4d
Coerce result to a float
rhettinger Mar 13, 2023
5fe1be5
Add test for the result type being a float.
rhettinger Mar 13, 2023
45ffe7e
Add blurb
rhettinger Mar 13, 2023
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Add test for the result type being a float.
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@rhettinger
rhettinger committed Mar 13, 2023
commit 5fe1be5898a0e649be8bb4c8127c05ef5d642b30
12 changes: 11 additions & 1 deletion Lib/test/test_statistics.py
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@@ -1,4 +1,4 @@
"""Test suite for statistics module, including helper NumericTestCase and
x = """Test suite for statistics module, including helper NumericTestCase and
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@alexanderGerbik alexanderGerbik Mar 23, 2023 •
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Is this a typo or some kind of black magic?

approx_equal function.

"""
Expand Down Expand Up @@ -2610,6 +2610,16 @@ def test_proportional(self):
self.assertAlmostEqual(slope, 20 + 1/150)
self.assertEqual(intercept, 0.0)

def test_float_output(self):
x = [Fraction(2, 3), Fraction(3, 4)]
y = [Fraction(4, 5), Fraction(5, 6)]
slope, intercept = statistics.linear_regression(x, y)
self.assertTrue(isinstance(slope, float))
self.assertTrue(isinstance(intercept, float))
slope, intercept = statistics.linear_regression(x, y, proportional=True)
self.assertTrue(isinstance(slope, float))
self.assertTrue(isinstance(intercept, float))

class TestNormalDist:

# General note on precision: The pdf(), cdf(), and overlap() methods
Expand Down