Number of Levels of a Factor
DESCRIPTION:
Return the number of levels that an object has.
USAGE:
nlevels(x)
REQUIRED ARGUMENTS:
- x
-
an object, typically a factor, having a
levels
attribute.
VALUE:
an integer value giving the number of levels. Returns 0 if no levels exist.
DETAILS:
This function was added for compatibility with R.
SEE ALSO:
,
.
EXAMPLES:
nlevels(fuel.frame$Type)