Extract the Root Mean Squared Error for a lmerMod object
a lmerMod object from the lme4 package
logical, should the result be returned on the scale of response variable standard deviations?
a numeric which represents the RMSE
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Loading required package: arm Loading required package: MASS Loading required package: Matrix Loading required package: lme4 arm (Version 1.9-3, built: 2016-11-21) Working directory is /work/tmp Loading required package: dplyr Attaching package: 'dplyr' The following object is masked from 'package:MASS': select The following objects are masked from 'package:stats': filter, lag The following objects are masked from 'package:base': intersect, setdiff, setequal, union  23.43806
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