Default replacement for missing values in categorical vectors.
An object of class
character of length 1.
NA_explicit_ is used as a default replacement for categorical vectors.
It is an active binding to
getOptions('NA_explicit_') and is exported
to the callers namespace.
To change the value of
options( NA_explicit = new_value )
NA_explicit_ cannot be directly set.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.