Comments on Statistical Issues in May 2014

Comments on Statistical Issues in November 2014

“…Cohen's kappa coefficient is a measure of inter-observer or inter-device agreement for qualitative (categorical) items used in many scientific fields; it accounts for the possibility that the agreement occurred by chance. However, as we mentioned previously, 1) kappa should not be used as a measure of agreement when all raters or devices cannot be treated symmetrically. When one of the sources of ratings may be viewed as superior or a standard (e.g., one rater is senior to the other or one medical device is more precise than the other), kappa may no longer be appropriate.…”

“…In this section, we continue to explain Cohen's kappa coefficient, which was described in the commentary titled, "Comments on statistical issues in May 2014", by Park 1) published in May 2014, and its related topics.…”