def testoneOffCorrelationCoefficientReturnsRvalue(self):
list = [1, 2, 1, 2, 5]
stat = Statistics(list)
expected = 0.7698003589195009
actual = stat.correlationCoefficient()
self.assertEqual(expected, actual)
def testLargeDataSetCorrelationCoefficientReturnsRvalue(self):
list = [1, 2, 1, 2, 5, 2, 4, 6, 7, 9, 0, 2, 3, 4, 5, 7, 6]
stat = Statistics(list)
expected = 0.4665694748158436
actual = stat.correlationCoefficient()
self.assertEqual(expected, actual)
def testsameDataSetCorrelationCoefficientReturnsRvalue(self):
list = [1, 2, 1, 2, 1]
stat = Statistics(list)
expected = 0
actual = stat.correlationCoefficient()
self.assertEqual(expected, actual)
def testnegativeCorrelationCoefficientReturnsRvalue(self):
list = [-1, -2, -3, -4, -5]
stat = Statistics(list)
expected = -0.9999999999999998
actual = stat.correlationCoefficient()
self.assertEqual(expected, actual)
def testcorrelationCoefficientReturnsRvalue(self):
list = [1, 2, 3, 4, 5]
stat = Statistics(list)
expected = 0.9999999999999998
actual = stat.correlationCoefficient()
self.assertEqual(expected, actual)
def testcorrelationCoefficientReturnsZero(self):
list = [1]
stat = Statistics(list)
expected = 0
actual = stat.correlationCoefficient()
self.assertEqual(expected, actual)
def testcorrelationCoefficientReturnsNone(self):
emptyList = []
stat = Statistics(emptyList)
expected = None
actual = stat.correlationCoefficient()
self.assertEqual(expected, actual)
