POPM 3240 Lecture 10: Calculating Kappa Practice Examples
7 Dec 2015
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In care, this could be a simple situation of having two radiologist separately evaluate the same x- ray. As epidemiologists, we are interested in how similar (or dissimilar) these rankings or ratings might be. One approach to capturing this is to measure the percent of agreement . A better measure we have to do that with is the kappa statistic . Kappa is a statistic that measures agreement beyond what would be due to chance alone. The following is a brief self- directed tutorial to help you better understand how to set- up and calculate a kappa statistic. The following formula will be provided to you on any examination: Agreementexpected = [(a+b)*(a+c)/n + (c+d)*(b+d)/n] / n. A farmer is trying to decide which of 60 cattle to cull from her herd. She asks two veterinarians to independently come and assess each animal and make a recommendation to either keep or cull .
