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Could anyone tell me about statistics which can be used to evaluate inter-rater reliability? Health workers were asked to use a new tool to rate three different case studies. What we want to know is whether within groups (nurses, dieticians etc) the ratings were similar. I have heard of Cohen's Kappa but I believe this is only for two raters, and we have 2-10 in each group. any suggestions appreciated thanks Emily %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%