
 
 I am running a logistic regression model with a random effect using lmer.  I am uncertain how to check for collinearity between my parameters.  I have already run cor() and linear regression for each combination of parameters, and all Rsqr values were <0.8….but I am analyzing ecological data so a 0.8 cutoff may be unrealistic.
 
-is there a way to check variance inflation factors or tolerance using lmer?-Or is there a better way?
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