The tdcmm class is a specialized type of data frame that is a
subclass of tbl_df, also known as a "tibble". It is
designed to be used with tidycomm functions to provide additional
information and context to the output tibbles generated by these functions.
This subclass specifically augments output based on statistical tests, by
including the relevant model object(s) estimated during the analysis, as
well as any performed assumption checks.
tdcmm objects in tidycomm are further subclassed with individual classes
handling visualization and printing per "output" type.