check_missing {recipes} | R Documentation |
Check for missing values
Description
check_missing
creates a specification of a recipe
operation that will check if variables contain missing values.
Usage
check_missing(
recipe,
...,
role = NA,
trained = FALSE,
columns = NULL,
skip = FALSE,
id = rand_id("missing")
)
Arguments
recipe |
A recipe object. The check will be added to the sequence of operations for this recipe. |
... |
One or more selector functions to choose variables
for this check. See |
role |
Not used by this check since no new variables are created. |
trained |
A logical for whether the selectors in |
columns |
A character string of the selected variable names. This field
is a placeholder and will be populated once |
skip |
A logical. Should the check be skipped when the
recipe is baked by |
id |
A character string that is unique to this check to identify it. |
Details
This check will break the bake
function if any of the checked
columns does contain NA
values. If the check passes, nothing is changed
to the data.
Value
An updated version of recipe
with the new check added to the
sequence of any existing operations.
tidy() results
When you tidy()
this check, a tibble with column
terms
(the selectors or variables selected) is returned.
See Also
Other checks:
check_class()
,
check_cols()
,
check_new_values()
,
check_range()
Examples
data(credit_data, package = "modeldata")
is.na(credit_data) %>% colSums()
# If the test passes, `new_data` is returned unaltered
recipe(credit_data) %>%
check_missing(Age, Expenses) %>%
prep() %>%
bake(credit_data)
# If your training set doesn't pass, prep() will stop with an error
## Not run:
recipe(credit_data) %>%
check_missing(Income) %>%
prep()
## End(Not run)
# If `new_data` contain missing values, the check will stop `bake()`
train_data <- credit_data %>% dplyr::filter(Income > 150)
test_data <- credit_data %>% dplyr::filter(Income <= 150 | is.na(Income))
rp <- recipe(train_data) %>%
check_missing(Income) %>%
prep()
bake(rp, train_data)
## Not run:
bake(rp, test_data)
## End(Not run)