Create vector based on roughly equally sized groups
Usage
ntiles(
x,
n = 3,
format = c("rank", "interval", "mean", "median", "center", "left", "right"),
digits = 3
)Arguments
- x
a numeric vector
- n
(approximate) number of quantiles
- format
a specification of desired output format. One of "center", "interval", "left", "right", "mean", or "median.
- digits
desired number of digits for labeling of factors.
Details
This is a functional clone of mosaic::ntiles in order to avoid the dependency. It should be
removed in the future, when there is no need to avoid such dependency, e.g. when {mosaic} is
available on WASM.
Examples
FEV |> head(20) |> mutate(group = ntiles(height, 3, format="center"))
#> # A tibble: 20 × 6
#> age FEV height sex smoker group
#> <int> <dbl> <dbl> <chr> <chr> <dbl>
#> 1 9 1.71 57 F not 57.2
#> 2 8 1.72 67.5 F not 63.2
#> 3 7 1.72 54.5 F not 52.2
#> 4 9 1.56 53 M not 52.2
#> 5 9 1.90 57 M not 57.2
#> 6 8 2.34 61 F not 63.2
#> 7 6 1.92 58 F not 57.2
#> 8 6 1.42 56 F not 57.2
#> 9 8 1.99 58.5 F not 57.2
#> 10 9 1.94 60 F not 63.2
#> 11 6 1.60 53 F not 52.2
#> 12 8 1.74 54 M not 52.2
#> 13 8 2.19 58.5 F not 57.2
#> 14 8 2.12 60.5 M not 63.2
#> 15 8 2.26 58 M not 57.2
#> 16 7 1.93 53 M not 52.2
#> 17 5 1.47 50 M not 52.2
#> 18 6 1.88 53 F not 52.2
#> 19 9 2.35 59 M not 63.2
#> 20 9 2.60 61.5 M not 63.2
FEV |> head(20) |> mutate(group = ntiles(height, 3, format="interval"))
#> # A tibble: 20 × 6
#> age FEV height sex smoker group
#> <int> <dbl> <dbl> <chr> <chr> <ord>
#> 1 9 1.71 57 F not [56,58.5]
#> 2 8 1.72 67.5 F not [59,67.5]
#> 3 7 1.72 54.5 F not [50,54.5]
#> 4 9 1.56 53 M not [50,54.5]
#> 5 9 1.90 57 M not [56,58.5]
#> 6 8 2.34 61 F not [59,67.5]
#> 7 6 1.92 58 F not [56,58.5]
#> 8 6 1.42 56 F not [56,58.5]
#> 9 8 1.99 58.5 F not [56,58.5]
#> 10 9 1.94 60 F not [59,67.5]
#> 11 6 1.60 53 F not [50,54.5]
#> 12 8 1.74 54 M not [50,54.5]
#> 13 8 2.19 58.5 F not [56,58.5]
#> 14 8 2.12 60.5 M not [59,67.5]
#> 15 8 2.26 58 M not [56,58.5]
#> 16 7 1.93 53 M not [50,54.5]
#> 17 5 1.47 50 M not [50,54.5]
#> 18 6 1.88 53 F not [50,54.5]
#> 19 9 2.35 59 M not [59,67.5]
#> 20 9 2.60 61.5 M not [59,67.5]