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It's possible that the effects of your predictor variable are already captured adequately by other variables included in your model. snake game If the predictor variable is not adding significant explanatory power beyond what's already accounted for by other covariates, its inclusion may not substan...

It looks like you're trying to fit a multilevel negative binomial model with dummy predictors at level 1 (individuals) and a random intercept at level 2 (groups). To calculate the Intraclass Correlation Coefficient (ICC), you'll need to consider both the fixed and random parts of the model. Here's a...