Each R package should include ../../math/R/Makefile.extension, which also
defines MASTER_SITES. Consequently, it is redundant for the individual
packages to do the same. Package-specific definitions also prevent
redefining MASTER_SITES in a single common place.
Test in linear mixed effects models. Attention is on linear mixed
effects models as implemented in the lme4 package. The package
implements a parametric bootstrap test. The package implements a
Kenward-Roger modification of F-tests.