Uninformative warning message for step_dummy() #450
Description
step_dummy() gives a warning about NA values, but it isn't specified that it is coming from step_dummy() or what could be done to fix this problem.
Adding step_unknown() seems to be the right course of action.
library(recipes)
data <- data.frame(a = c(LETTERS, NA))
recipe(~ a, data = data) %>%
step_dummy(a) %>%
prep()
#> Warning: There are new levels in a factor: NA
#> Data Recipe
#>
#> Inputs:
#>
#> role #variables
#> predictor 1
#>
#> Training data contained 27 data points and 1 incomplete row.
#>
#> Operations:
#>
#> Dummy variables from a [trained]
recipe(~ a, data = data) %>%
step_unknown(a) %>%
step_dummy(a) %>%
prep()
#> Data Recipe
#>
#> Inputs:
#>
#> role #variables
#> predictor 1
#>
#> Training data contained 27 data points and 1 incomplete row.
#>
#> Operations:
#>
#> Unknown factor level assignment for a [trained]
#> Dummy variables from a [trained]Created on 2020-01-15 by the reprex package (v0.3.0)
Session info
devtools::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#> setting value
#> version R version 3.6.0 (2019-04-26)
#> os macOS Mojave 10.14.6
#> system x86_64, darwin15.6.0
#> ui X11
#> language (EN)
#> collate en_US.UTF-8
#> ctype en_US.UTF-8
#> tz America/Los_Angeles
#> date 2020-01-15
#>
#> ─ Packages ───────────────────────────────────────────────────────────────────
#> package * version date lib source
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#>
#> [1] /Library/Frameworks/R.framework/Versions/3.6/Resources/library