syntax | R Documentation |
Selecting Syntax
The cards package also utilizes selectors: selectors from the tidyselect package and custom selectors. Review their help files for details.
tidy selectors
everything()
, all_of()
, any_of()
, starts_with()
, ends_with()
,
contains()
, matches()
, num_range()
, last_col()
cards selectors
all_ard_groups()
, all_ard_variables()
Some arguments in the cards package accept list and
formula notation, e.g. ard_continuous(statistic=)
.
Below enumerates a few tips and shortcuts for using the list and formulas.
List of Formulas
Typical usage includes a list of formulas, where the LHS is a variable name or a selector.
ard_continuous(statistic = list(age ~ list(N = \(x) length(x)), starts_with("a") ~ list(mean = mean)))
Named List
You may also pass a named list; however, the tidyselect selectors are not supported with this syntax.
ard_continuous(statistic = list(age = list(N = \(x) length(x))))
Hybrid Named List/List of Formulas
You can pass a combination of formulas and named elements.
ard_continuous(statistic = list(age = list(N = \(x) length(x)), starts_with("a") ~ list(mean = mean)))
Shortcuts
You can pass a single formula, which is equivalent to passing the formula in a list.
ard_continuous(statistic = starts_with("a") ~ list(mean = mean)
As a shortcut to select all variables, you can omit the LHS of the formula. The two calls below are equivalent.
ard_continuous(statistic = ~list(N = \(x) length(x))) ard_continuous(statistic = everything() ~ list(N = \(x) length(x)))
Combination Selectors
Selectors can be combined using the c()
function.
ard_continuous(statistic = c(everything(), -age) ~ list(N = \(x) length(x)))
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