These functions are simple wrappers to set contrasts globally via options(contrasts = ...)
.
set_sum_contrasts()set_deviation_contrasts()
set_effects_contrasts()
set_default_contrasts()
set_treatment_contrasts()
nothing. These functions are called for their side effects to change the global options.
set_deviation_contrasts
and set_effects_contrasts
are wrappers for set_sum_contrasts
. Likewise, set_default_contrasts
is a wrapper to set_treatment_contrasts()
.