R (>= 2.2.1), Design, lattice, nlme, Hmisc, geepack, MASS
lattice, nlme, Hmisc, geepack, MASS, sandwich
knitr, kableExtra, dplyr, ggplot2, tidyr, rmarkdown,
testthat, covr, geepack
knitr, kableExtra, dplyr, ggplot2, tidyr, rmarkdown,
testthat, covr, geepack, splines