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Oct 18 at 16:22 comment added jginestet That would not at all solve your main issue which is that you only have 1 "unit" being rated. And in addition, you would now sum ordinal numbers, which is, to say the least, a debatable practice. Note that you could also use Fleiss kappa (en.wikipedia.org/wiki/Fleiss%27_kappa), which can be computed even with only 1 subject (it computes agreement by chance differently).
Oct 18 at 9:10 comment added Marc Roux Thank you very much for the explanations, which were very helpful. Would it therefore perhaps be wiser if I grouped the 5 criteria together? Category Delivery (= criterion eye contact and gestures) Category Conent (= criterion correctness, introduction etc.) In this way, I would not have the reliability for each criterion, but for individual areas and thus have more meaningful reliability data?
Oct 17 at 17:57 history answered jginestet CC BY-SA 4.0