The analysis of ordinal agreement data: beyond weighted kappa.

@article{Graham1993TheAO,
  title={The analysis of ordinal agreement data: beyond weighted kappa.},
  author={Patrick J Graham and Rodney M. Jackson},
  journal={Journal of clinical epidemiology},
  year={1993},
  volume={46 9},
  pages={1055-62}
}
The weighted kappa statistic has been used as an agreement index for ordinal data. Using data on the comparability of primary and proxy respondent reports of alcohol drinking frequency we show that the value of weighted kappa can be sensitive to the choice of weights. The distinction between association and agreement is clarified and it is shown that in some respects weighted kappa behaves more like a measure of association than an index of agreement. In particular, it is demonstrated that the… CONTINUE READING

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