
install.packages('lmerTest')
F
tests of types I - III hypotheses for the fixed part,
likelihood ratio tests for the random part, least squares means
(population means) and differences of least squares means for the factors
of the fixed part with corresponding plots. The package also provides with
a function step, that preforms backward elimination of non-significant effects,
starting from the random effects, and then fixed ones.summary
in Package lmerTestanova
in package lmerTest