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Anyone can suggest me a nonparametric version of the intraclass correlation coefficient (ICC)? My model have the following details: two-way random effects model, consistency, average ratings as unit. I am using irr R-cran package.

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The ICC is not, in itself, a parametric statistic. You can conceive of the ICC regardless of the distribution of the data. What exactly do you mean by "nonparametric ICC"? – Macro May 25 '12 at 14:51
I have seen that in some studies the ratings are firstly examined to check a possible violations from normality, and then ICC is computed. Is it mandatory? What if the ratings are far from normality? – netrunner May 25 '12 at 15:17

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