Extract the variances and correlations for random effects from a merMod list
1 2  ## S3 method for class 'merModList'
VarCorr(x, sigma = 1, rdig = 3L)

x 
for 
sigma 
an optional numeric value used as a multiplier for the standard deviations. 
rdig 
the number of digits to round to, integer 
a list with two elements "stddev" and "correlation" for the standard deviations and correlations averaged across models in the list
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