116 lines
3.8 KiB
Python
116 lines
3.8 KiB
Python
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import pytest
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import numpy as np
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from numpy.testing import assert_array_equal, assert_equal
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from scipy.stats.contingency import crosstab
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@pytest.mark.parametrize('sparse', [False, True])
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def test_crosstab_basic(sparse):
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a = [0, 0, 9, 9, 0, 0, 9]
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b = [2, 1, 3, 1, 2, 3, 3]
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expected_avals = [0, 9]
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expected_bvals = [1, 2, 3]
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expected_count = np.array([[1, 2, 1],
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[1, 0, 2]])
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(avals, bvals), count = crosstab(a, b, sparse=sparse)
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assert_array_equal(avals, expected_avals)
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assert_array_equal(bvals, expected_bvals)
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if sparse:
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assert_array_equal(count.A, expected_count)
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else:
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assert_array_equal(count, expected_count)
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def test_crosstab_basic_1d():
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# Verify that a single input sequence works as expected.
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x = [1, 2, 3, 1, 2, 3, 3]
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expected_xvals = [1, 2, 3]
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expected_count = np.array([2, 2, 3])
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(xvals,), count = crosstab(x)
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assert_array_equal(xvals, expected_xvals)
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assert_array_equal(count, expected_count)
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def test_crosstab_basic_3d():
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# Verify the function for three input sequences.
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a = 'a'
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b = 'b'
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x = [0, 0, 9, 9, 0, 0, 9, 9]
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y = [a, a, a, a, b, b, b, a]
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z = [1, 2, 3, 1, 2, 3, 3, 1]
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expected_xvals = [0, 9]
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expected_yvals = [a, b]
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expected_zvals = [1, 2, 3]
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expected_count = np.array([[[1, 1, 0],
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[0, 1, 1]],
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[[2, 0, 1],
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[0, 0, 1]]])
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(xvals, yvals, zvals), count = crosstab(x, y, z)
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assert_array_equal(xvals, expected_xvals)
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assert_array_equal(yvals, expected_yvals)
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assert_array_equal(zvals, expected_zvals)
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assert_array_equal(count, expected_count)
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@pytest.mark.parametrize('sparse', [False, True])
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def test_crosstab_levels(sparse):
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a = [0, 0, 9, 9, 0, 0, 9]
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b = [1, 2, 3, 1, 2, 3, 3]
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expected_avals = [0, 9]
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expected_bvals = [0, 1, 2, 3]
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expected_count = np.array([[0, 1, 2, 1],
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[0, 1, 0, 2]])
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(avals, bvals), count = crosstab(a, b, levels=[None, [0, 1, 2, 3]],
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sparse=sparse)
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assert_array_equal(avals, expected_avals)
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assert_array_equal(bvals, expected_bvals)
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if sparse:
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assert_array_equal(count.A, expected_count)
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else:
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assert_array_equal(count, expected_count)
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@pytest.mark.parametrize('sparse', [False, True])
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def test_crosstab_extra_levels(sparse):
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# The pair of values (-1, 3) will be ignored, because we explicitly
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# request the counted `a` values to be [0, 9].
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a = [0, 0, 9, 9, 0, 0, 9, -1]
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b = [1, 2, 3, 1, 2, 3, 3, 3]
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expected_avals = [0, 9]
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expected_bvals = [0, 1, 2, 3]
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expected_count = np.array([[0, 1, 2, 1],
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[0, 1, 0, 2]])
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(avals, bvals), count = crosstab(a, b, levels=[[0, 9], [0, 1, 2, 3]],
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sparse=sparse)
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assert_array_equal(avals, expected_avals)
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assert_array_equal(bvals, expected_bvals)
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if sparse:
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assert_array_equal(count.A, expected_count)
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else:
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assert_array_equal(count, expected_count)
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def test_validation_at_least_one():
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with pytest.raises(TypeError, match='At least one'):
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crosstab()
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def test_validation_same_lengths():
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with pytest.raises(ValueError, match='must have the same length'):
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crosstab([1, 2], [1, 2, 3, 4])
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def test_validation_sparse_only_two_args():
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with pytest.raises(ValueError, match='only two input sequences'):
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crosstab([0, 1, 1], [8, 8, 9], [1, 3, 3], sparse=True)
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def test_validation_len_levels_matches_args():
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with pytest.raises(ValueError, match='number of input sequences'):
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crosstab([0, 1, 1], [8, 8, 9], levels=([0, 1, 2, 3],))
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def test_result():
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res = crosstab([0, 1], [1, 2])
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assert_equal((res.elements, res.count), res)
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