Different kinds of tests for linear mixed effects models as implemented in 'lme4' package are provided. The tests comprise types I  III F tests for fixed effects, LR tests for random effects. The package also provides the calculation of population means for fixed factors with confidence intervals and corresponding plots. Finally the backward elimination of nonsignificant effects is implemented.
Package details 


Maintainer  
License  GPL (>= 2) 
Version  2.037.9002 
URL  https://github.com/runehaubo/lmerTest 
Package repository  View on GitHub 
Installation 
Install the latest version of this package by entering the following in R:

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