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- Title
The agreement chart.
- Authors
Bangdiwala, Shrikant I.; Shankar, Viswanathan
- Abstract
Background: When assessing the concordance between two methods of measurement of ordinal categorical data, summary measures such as Cohen's (1960) kappa or Bangdiwala's (1985) B-statistic are used. However, a picture conveys more information than a single summary measure. Methods: We describe how to construct and interpret Bangdiwala's (1985) agreement chart and illustrate its use in visually assessing concordance in several example clinical applications. Results: The agreement charts provide a visual impression that no summary statistic can convey, and summary statistics reduce the information to a single characteristic of the data. However, the visual impression is personal and subjective, and not usually reproducible from one reader to another. Conclusions: The agreement chart should be used to complement the summary kappa or B-statistics, not to replace them. The graphs can be very helpful to researchers as an early step to understand relationships in their data when assessing concordance.
- Subjects
GRAPHIC methods; WEIGHTS &; measures; STATISTICAL charts &; diagrams; GEOMETRICAL drawing; LEAST squares
- Publication
BMC Medical Research Methodology, 2013, Vol 13, Issue 1, p1
- ISSN
1471-2288
- Publication type
Article
- DOI
10.1186/1471-2288-13-97