ADD: Feature to calculate Kohen's Kappa from labels#16
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Adds calculate_cohen_kappa(df, label_col, pred_col) to lars/util/confusion_matrix.py and exports it from lars/util/__init__.py. Unit test asserts the exact value κ=5/11 for the mock six-row CSV (4 agreements, p_e=7/18 from equal marginals across three classes). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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This feature will calculate the Cohen's Kappa from the encoded labels.