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...as a measure of concordance of pixel intensity in between left and right Side . Can anybody help me with the correct formula, i.e. do you have to include variance component estimator for level 1 ("Dog"), too? Is it something like this: ICC = (sigma2_RandomSlope-Dog + sigma2_RandomSlope-SidewithinDog) / (sigma2_RandomSlope-Dog + sigma2_RandomSlope-SidewithinDog + sigma2_error) Any hints would be appreciated! Many thanks in advance. Christine Adrion, University of Munich -- View this message in context: http://www.nabble.com/How-to-calculate-Intraclass-coefficient-in-2-level-Linear-Mixe...