Compute group-wise proportions from counts

fastprop() computes the proportion of counts within groups. It expects the input to already contain a count column named n (for example the output of dplyr::count() or fastcount()).

Usage

fastprop(.data, ...)

Arguments

.data

A data frame or tibble containing a count column n.

...

Grouping variables. Proportions are computed within the combinations of these variables.

Value

A tibble with the same columns as .data plus a numeric prop column giving the group share (0–1). Missing n values are ignored in the denominator via na.rm = TRUE.

See also

dplyr::count, fastcount

Examples

library(dplyr)
df <- tibble::tibble(group = c("a","a","b"))
df |> count(group) |> fastprop(group)
#> # A tibble: 2 × 3
#>   group     n  prop
#>   <chr> <int> <dbl>
#> 1 a         2     1
#> 2 b         1     1