Abstract:
:Cohen's kappa coefficient, κ, is a statistical measure of inter-rater agreement or inter-annotator agreement for qualitative items. In this paper, we focus on interval estimation of κ in the case of two raters and binary items. So far, only asymptotic and bootstrap intervals are available for κ due to its complexity. However, there is no guarantee that such intervals will capture κ with the desired nominal level 1- α. In other words, the statistical inferences based on these intervals are not reliable. We apply the Buehler method to obtain exact confidence intervals based on four widely used asymptotic intervals, three Wald-type confidence intervals and one interval constructed from a profile variance. These exact intervals are compared with regard to coverage probability and length for small to medium sample sizes. The exact intervals based on the Garner interval and the Lee and Tu interval are generally recommended for use in practice due to good performance in both coverage probability and length.
journal_name
Stat Methods Med Resjournal_title
Statistical methods in medical researchauthors
Shan G,Wang Wdoi
10.1177/0962280214552881subject
Has Abstractpub_date
2017-04-01 00:00:00pages
615-632issue
2eissn
0962-2802issn
1477-0334pii
0962280214552881journal_volume
26pub_type
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