add_row_id              Add a row ID column to a data frame
as_numerical            Coerce to numerical and identify non-numerical
                        entries
cols_all_unique         Identify columns with all unique values
cols_bijective          Identify bijective (one-to-one correspondence)
                        columns
cols_binary             Identify columns with a specific number of
                        unique values
cols_constant           Identify constant columns
cols_identify_all       Identify all columns with potential issues
cols_missing            Identify columns that have certain proportion
                        of missing values
cols_nested             Nestedness checks
concurrence_matrix      Get the concurrence matrix or table
is_complete             Is variable complete within another variable?
is_nested               Is variable nested within another variable?
is_numerical            Is the variable numerical?
is_observational_unit   Is it the observational unit?
rows_missing            Identify rows that have certain proportion of
                        missing values
watch_tits              Coordination of care by breeders and helpers in
                        the cooperatively breeding long-tailed tit
white_clover            A field experiment assessing the roles of
                        drought, herbivory, and local climate for white
                        clovers
