46 lines
1.6 KiB
Python
46 lines
1.6 KiB
Python
# scipy-yli: Helpful SciPy utilities and recipes
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# Copyright © 2022 Lee Yingtong Li (RunasSudo)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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from pytest import approx
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import numpy as np
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import pandas as pd
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import yli
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def test_ttest_ind_ol6_1():
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"""Compare yli.ttest_ind for Ott & Longnecker (2016) example 6.1"""
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df = pd.DataFrame({
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'Type': ['Fresh'] * 10 + ['Stored'] * 10,
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'Potency': [10.2, 10.5, 10.3, 10.8, 9.8, 10.6, 10.7, 10.2, 10.0, 10.6, 9.8, 9.6, 10.1, 10.2, 10.1, 9.7, 9.5, 9.6, 9.8, 9.9]
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})
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result = yli.ttest_ind(df, 'Potency', 'Type')
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t_expected = 0.54/(0.285*np.sqrt(1/10+1/10))
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assert result.statistic == approx(t_expected, abs=0.01)
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assert result.dof == 18
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assert result.delta.point == approx(0.54, abs=0.01)
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assert result.delta.ci_lower == approx(0.272, abs=0.01)
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assert result.delta.ci_upper == approx(0.808, abs=0.01)
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expected_summary = '''t(18) = 4.24; p < 0.001*
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Δμ (95% CI) = 0.54 (0.27–0.81), Fresh > Stored'''
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assert result.summary() == expected_summary
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