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yh202109 committed Nov 12, 2024
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6 changes: 3 additions & 3 deletions docs/statlab_kappa3.rst
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Expand Up @@ -93,7 +93,7 @@ The Cohen's :math:`\kappa` statistic is calculated as :math:`\kappa = \frac{p_O
The SE of :math:`\kappa` is calculated as :math:`\sqrt{\frac{p_O(1-p_O)}{n(1-p_E)^2}}`.

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BIAS, PREVALENCE AND ADJUSTED KAPPAS:
Bias, Prevalence and Adjusted Kappas
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All discussion in this section are based on Byrt, T., Bishop, J., & Carlin, J. B. (1993) [1]_ [2]_ [3]_.
Expand All @@ -108,8 +108,8 @@ For two raters and two categories (:math:`J=2`), Byrt et al. define Bias Index (
:math:`\hat{BI}` has the following properties:

- when two off-diagonal counts are equal, which means :math:`N_{12} = N_{21}`, :math:`\hat{BI} = 0`,
- when two raters have the same frequencies of ratings, which means :math:`N_{1 \bullet} = N_{\bullet 1}` (also :math:` N_{11}+N_{12} = N_{11}+N_{21}`), :math:`\hat{BI} = 0`, and
- when two off-diagonal counts are equal, which means :math:`N_{12} = N_{21}`, then :math:`\hat{BI} = 0`,
- when two raters have the same frequencies of ratings, which means :math:`N_{1 \bullet} = N_{\bullet 1}`, and :math:` N_{11}+N_{12} = N_{11}+N_{21}`, then :math:`\hat{BI} = 0`, and
- when :math:`N_{12} = n` or :math:`N_{21}=n`, :math:`|\hat{BI}|=1`.


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