def test_cramer_returns_one(self):
x1 = np.array(['a'] * 98 + ['b'] + ['c'])
cramer = cramer_v.cramer_v(x1, x1)
self.assertEqual(cramer, 1)
def test_cramer_swapped_variables_return_same_value(self):
x1 = np.array([1, 2, 1])
x2 = np.array([1, 2, 2])
cramer_1_2 = cramer_v.cramer_v(x1, x2)
cramer_2_1 = cramer_v.cramer_v(x2, x1)
self.assertEqual(cramer_1_2, cramer_2_1)
def test_cramer_returns_expected_value(self):
x1 = np.array([1, 2, 1])
x2 = np.array([2, 1, 1])
cramer = cramer_v.cramer_v(x1, x2)
self.assertEqual(cramer, 0.25)