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This is not medical advice. The content is intended as educational content for health care professionals and students. If you are a patient, seek care of a health care professional. In the ideal scenario, when two or more investigators conduct the same test, they will agree 100%. Though that's rarely ever the case. And if so, what is the chance that they simply got lucky in their agreement. That's where a Kappa statistic comes into play. The Kappa value rates how good the agreement is whilst eliminating the chance of luck. Kai shows how to calculate it.
Article: https://www.ncbi.nlm.nih.gov/pubmed/15883903 (Viera et al. 2005)
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