step_invlogit {recipes} | R Documentation |
step_invlogit
creates a specification of a recipe step that
will transform the data from real values to be between zero and one.
step_invlogit(recipe, ..., role = NA, trained = FALSE, columns = NULL)
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 are
affected by the step. See |
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 variable names that will be (eventually)
populated by the |
The inverse logit transformation takes values on the real line and
translates them to be between zero and one using the function
f(x) = 1/(1+exp(-x))
.
An updated version of recipe
with the
new step added to the sequence of existing steps (if any).
step_logit
step_log
step_sqrt
step_hyperbolic
recipe
prep.recipe
bake.recipe
data(biomass) biomass_tr <- biomass[biomass$dataset == "Training",] biomass_te <- biomass[biomass$dataset == "Testing",] rec <- recipe(HHV ~ carbon + hydrogen + oxygen + nitrogen + sulfur, data = biomass_tr) ilogit_trans <- rec %>% step_center(carbon, hydrogen) %>% step_scale(carbon, hydrogen) %>% step_invlogit(carbon, hydrogen) ilogit_obj <- prep(ilogit_trans, training = biomass_tr) transformed_te <- bake(ilogit_obj, biomass_te) plot(biomass_te$carbon, transformed_te$carbon)