nlevels
Number of Levels of a factor Object

### Description

Returns the number of levels for the specified object.

### Usage

    nlevels(x)

### 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.
See Also
levels, factor.
Examples

    fa <- factor(c("a", "b", "c", "b", "a"))
    nlevels(fa)
    # [1] 3

Package base version 6.1.5-18
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