Linear mixed-effects models using S4 classes
Fit linear and generalized linear mixed-effects models.
        This is the implementation of lme4 available on CRAN and
        developed up to 2011.
Douglas Bates <bates@stat.wisc.edu>, Martin Maechler
        <maechler@R-project.org> and Ben Bolker <bolker@mcmaster.ca>
mlmRev, MEMSS, coda, MASS, sfsmisc, MatrixModels