[R] Table orderd by frequencies

[Kunzler, Andreas]

Dear List,

I try to order the output of a table by the frequencies of the vector I
am look at.

The object I am looking at is a factor with a lot of levels that were
named only once.

Therefore it would be much easier to order the output by the frequencies
of the levels.

E.g.
> levels(a)
"a" "b" "c" "d"

Preferred outcome: 
table(a)

b  c a d
10 5 1 1

Thank you