Convert Factors to Strings

Source: R/factor2string.R

step_factor2string will convert one or more factor vectors to strings.

step_factor2string(
  recipe,
  ...,
  role = NA,
  trained = FALSE,
  columns = FALSE,
  skip = FALSE,
  id = rand_id("factor2string")
)

# S3 method for step_factor2string
tidy(x, ...)

Arguments

recipe

A recipe object. The step will be added to the sequence of operations for this recipe.
...

One or more selector functions to choose which variables will be converted to strings. See selections() for more details. For the tidy method, these are not currently used.
role

Not used by this step since no new variables are created.
trained

A logical to indicate if the quantities for preprocessing have been estimated.
columns

A character string of variables that will be converted. This is NULL until computed by prep.recipe().
skip

A logical. Should the step be skipped when the recipe is baked by bake.recipe()? While all operations are baked when prep.recipe() is run, some operations may not be able to be conducted on new data (e.g. processing the outcome variable(s)). Care should be taken when using skip = TRUE as it may affect the computations for subsequent operations
id

A character string that is unique to this step to identify it.
x

A step_factor2string object.

Value

An updated version of recipe with the new step added to the sequence of existing steps (if any). For the tidy method, a tibble with columns terms (the columns that will be affected).

Details

prep has an option strings_as_factors that defaults to TRUE. If this step is used with the default option, the string(s() produced by this step will be converted to factors after all of the steps have been prepped.

See also

step_string2factor() step_dummy()

Examples

library(modeldata)
data(okc)

rec <- recipe(~ diet + location, data = okc)

rec <- rec %>%
  step_string2factor(diet)

factor_test <- rec %>%
  prep(training = okc,
       strings_as_factors = FALSE) %>%
  juice
# diet is a
class(factor_test$diet)

#> [1] "factor"

rec <- rec %>%
  step_factor2string(diet)

string_test <- rec %>%
  prep(training = okc,
       strings_as_factors = FALSE) %>%
  juice
# diet is a
class(string_test$diet)

#> [1] "character"

tidy(rec, number = 1)

#> # A tibble: 1 x 3
#>   terms ordered id                 
#>   <chr> <lgl>   <chr>              
#> 1 diet  FALSE   string2factor_qApoE