(tidy-select
)
columns to tabulate by/stratify by for calculation.
Arguments are similar, but with an important distinction:
.by
: results are tabulated by all combinations of the columns specified,
including unobserved combinations and unobserved factor levels.
.strata
: results are tabulated by all observed combinations of the
columns specified.
These argument should not include any columns that appear in the .f
argument.