示例#1
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 def testVariance_ShortList_UsesPopulationVariance(self):
     self.assertAlmostEqual(6.25, sum([12.25, 0.25, 0.25, 12.25]) / 4.0)
     self.assertAlmostEqual(6.25, math_utils.Variance([-3, 0, 1, 4]))
示例#2
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 def testVariance_EmptyList_ReturnsNan(self):
     self.assertTrue(math.isnan(math_utils.Variance([])))
示例#3
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 def testVariance_OneValue_ReturnsZero(self):
     self.assertEqual(0.0, math_utils.Variance([0]))
     self.assertEqual(0.0, math_utils.Variance([4.3]))
示例#4
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def _MakeSampleStats(sample):
    """Calculates relevant stats for a sample and makes a SampleStats object."""
    return SampleStats(math_utils.Mean(sample), math_utils.Variance(sample),
                       len(sample))