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Return the number of levels which its argument has.
nlevels(x)an object, usually a factor.
The length of levels(x), which is zero if
x has no levels.
This is usually applied to a factor, but other objects can have levels.
The actual factor levels (if they exist) can be obtained
with the levels function.
# NOT RUN {
nlevels(gl(3, 7)) # = 3
# }
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