Using Pooled Kappa to Summarize Interrater Agreement Across Many Items
Published In: Field Methods, v. 20, no. 3, Aug. 2008, p. 272-282
Posted on RAND.org on January 01, 2008
The authors propose the pooled estimator of kappa, an efficient estimator when summarizing the interrater agreement for qualitative data with many items but few subjects. They evaluate this estimator through a simulation of proposed and alternative (average kappa) estimators and subsequently apply our method to calculate pooled and average kappas over 2,176 rated items from six semistructured interviews with sponsors of the CAHPS. The proposed pooled kappa estimator efficiently summarizes interrater agreement by domain. It is more widely applicable and makes better use of scarce subjects than simply averaging item-level kappas.
This report is part of the RAND Corporation External publication series. Many RAND studies are published in peer-reviewed scholarly journals, as chapters in commercial books, or as documents published by other organizations.
The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.