drop_na() drops rows where any column specified by ... contains a
missing value.
Arguments
- data
- A data frame. 
- ...
- < - tidy-select> Columns to inspect for missing values. If empty, all columns are used.
Details
Another way to interpret drop_na() is that it only keeps the "complete"
rows (where no rows contain missing values). Internally, this completeness is
computed through vctrs::vec_detect_complete().
