Description Usage Arguments Details Examples
Checks:
is character
at most one NA
no blanks (zero-length strings)
no duplicates
| 1 2 3 | 
| x | A character vector. | 
| name | The name for  | 
Function also called by chk_values_triangles,
chk_values_directions, and
chk_values_quantiles.
| 1 2 | x <- c("Thailand", "Laos", "Cambodia")
chk_values_categories(x = x, name = "x")
 | 
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