def test_value_error_for_risk_measure(self):
"""
Test HERC when a different allocation metric string is used.
"""
with self.assertRaises(ValueError):
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_names=self.data.columns, asset_prices=self.data, risk_measure='random_metric')
def test_all_inputs_none(self):
"""
Test allocation when all inputs are None.
"""
with self.assertRaises(ValueError):
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_names=self.data.columns)
def test_value_error_for_non_dataframe_input(self):
"""
Test ValueError on passing non-dataframe input.
"""
with self.assertRaises(ValueError):
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_prices=self.data.values, asset_names=self.data.columns)
def test_value_error_for_non_date_index(self):
"""
Test ValueError on passing dataframe not indexed by date.
"""
with self.assertRaises(ValueError):
herc = HierarchicalEqualRiskContribution()
data = self.data.reset_index()
herc.allocate(asset_prices=data, asset_names=self.data.columns)
def test_value_error_with_no_asset_names(self):
"""
Test ValueError when not supplying a list of asset names and no other input
"""
with self.assertRaises(ValueError):
herc = HierarchicalEqualRiskContribution()
returns = ReturnsEstimators().calculate_returns(asset_prices=self.data)
herc.allocate(asset_returns=returns.values,
optimal_num_clusters=6)
def test_value_error_for_expected_shortfall(self):
"""
Test ValueError when expected_shortfall is the allocation metric, no asset_returns dataframe
is given and no asset_prices dataframe is passed.
"""
with self.assertRaises(ValueError):
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_names=self.data.columns,
optimal_num_clusters=5,
risk_measure='expected_shortfall')
def test_no_asset_names(self):
"""
Test HERC when not supplying a list of asset names.
"""
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_prices=self.data,
optimal_num_clusters=6)
weights = herc.weights.values[0]
assert (weights >= 0).all()
assert len(weights) == self.data.shape[1]
np.testing.assert_almost_equal(np.sum(weights), 1)
def test_herc_with_input_as_returns(self):
"""
Test HERC when passing asset returns dataframe as input.
"""
herc = HierarchicalEqualRiskContribution()
returns = ReturnsEstimators().calculate_returns(asset_prices=self.data)
herc.allocate(asset_returns=returns, asset_names=self.data.columns)
weights = herc.weights.values[0]
assert (weights >= 0).all()
assert len(weights) == self.data.shape[1]
np.testing.assert_almost_equal(np.sum(weights), 1)
def test_quasi_diagnalization(self):
"""
Test the quasi-diagnalisation step of HERC algorithm.
"""
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_prices=self.data,
linkage='single',
optimal_num_clusters=5,
asset_names=self.data.columns)
assert herc.ordered_indices == [13, 9, 10, 8, 14, 7, 1, 6, 4, 16, 3, 17,
12, 18, 22, 0, 15, 21, 11, 2, 20, 5, 19]
def test_dendrogram_plot(self):
"""
Test if dendrogram plot object is correctly rendered.
"""
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_prices=self.data, optimal_num_clusters=5)
dendrogram = herc.plot_clusters(assets=self.data.columns)
assert dendrogram.get('icoord')
assert dendrogram.get('dcoord')
assert dendrogram.get('ivl')
assert dendrogram.get('leaves')
assert dendrogram.get('color_list')
def test_no_asset_names_with_asset_returns(self):
"""
Test HERC when not supplying a list of asset names and when the user passes asset_returns.
"""
herc = HierarchicalEqualRiskContribution()
returns = ReturnsEstimators().calculate_returns(asset_prices=self.data)
herc.allocate(asset_returns=returns,
optimal_num_clusters=6)
weights = herc.weights.values[0]
assert (weights >= 0).all()
assert len(weights) == self.data.shape[1]
np.testing.assert_almost_equal(np.sum(weights), 1)
def test_herc_expected_shortfall(self):
"""
Test the weights calculated by the HERC algorithm - if all the weights are positive and
their sum is equal to 1.
"""
herc = HierarchicalEqualRiskContribution()
herc.allocate(asset_prices=self.data,
asset_names=self.data.columns,
optimal_num_clusters=5,
risk_measure='expected_shortfall')
weights = herc.weights.values[0]
assert (weights >= 0).all()
assert len(weights) == self.data.shape[1]
np.testing.assert_almost_equal(np.sum(weights), 1)
def test_herc_with_input_as_covariance_matrix(self):
"""
Test HERC when passing a covariance matrix as input.
"""
herc = HierarchicalEqualRiskContribution()
returns = ReturnsEstimators().calculate_returns(asset_prices=self.data)
herc.allocate(asset_names=self.data.columns,
covariance_matrix=returns.cov(),
optimal_num_clusters=6,
asset_returns=returns)
weights = herc.weights.values[0]
assert (weights >= 0).all()
assert len(weights) == self.data.shape[1]
np.testing.assert_almost_equal(np.sum(weights), 1)
def test_herc_with_asset_returns_as_none(self):
"""
Test HERC when asset returns are not required for calculating the weights.
"""
herc = HierarchicalEqualRiskContribution()
returns = ReturnsEstimators().calculate_returns(asset_prices=self.data)
herc.allocate(asset_names=self.data.columns,
covariance_matrix=returns.cov(),
optimal_num_clusters=5,
risk_measure='equal_weighting')
weights = herc.weights.values[0]
assert (weights >= 0).all()
assert len(weights) == self.data.shape[1]
np.testing.assert_almost_equal(np.sum(weights), 1)