Convert character variable to a factor based off it's numeric variable counterpart.

char2factor(df, c_var, n_var)

Arguments

df: data frame.
c_var: character variable within the data frame.
n_var: numeric variable counter part within the data frame to control the levels.

Value

A factor.

Examples

df <- tibble::tribble(
  ~TRT01P, ~TRT01PN,
  "Placebo",   1,
  "Low Dose",  2,
  "High Dose", 3
  )

# alphabetical order
dplyr::arrange(df, TRT01P)
#> # A tibble: 3 × 2
#>   TRT01P    TRT01PN
#>   <chr>       <dbl>
#> 1 High Dose       3
#> 2 Low Dose        2
#> 3 Placebo         1

# change to factor with char2factor
df$TRT01P <- char2factor(df, "TRT01P", "TRT01PN")

# factor order
dplyr::arrange(df, TRT01P)
#> # A tibble: 3 × 2
#>   TRT01P    TRT01PN
#>   <fct>       <dbl>
#> 1 Placebo         1
#> 2 Low Dose        2
#> 3 High Dose       3