Journal
RADIOLOGY
Volume 228, Issue 2, Pages 303-308Publisher
RADIOLOGICAL SOC NORTH AMERICA
DOI: 10.1148/radiol.2282011860
Keywords
diagnostic radiology, observer performance; statistical analysis
Funding
- NCI NIH HHS [P01 CA53141] Funding Source: Medline
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Statistical measures are described that are used in diagnostic imaging for expressing observer agreement in regard to categorical data. The measures are used to characterize the reliability of imaging methods and the reproducibility of disease classifications and, occasionally with great care, as the surrogate for accuracy. The review concentrates on the chance-corrected indices, kappa and weighted kappa. Examples from the imaging literature illustrate the method of calculation and the effects of both disease prevalence and the number of rating categorie. Other measures of agreement that are used less frequently, including multiple-rater kappa, are referenced and described briefly. (C) RSNA 2003.
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