A note to the user about the class of the output object.
grouped_message()
grouped_ggbetweenstats
,
grouped_gghistostats
, grouped_ggscatterstats
,
grouped_ggpiestats
, grouped_ggcorrmat
Other helper_messages: bartlett_message
,
ggcorrmat_matrix_message
,
normality_message
,
palette_message