[R] sorting factor levels by data frequency of levels

[Shoaaib Mehmood]

using an example from r online help

> state <- c("tas", "sa", "qld", "nsw", "nsw", "nt", "wa", "wa",
    "qld", "vic", "nsw", "vic", "qld", "qld", "sa", "tas",
    "sa", "nt", "wa", "vic", "qld", "nsw", "nsw", "wa",
    "sa", "act", "nsw", "vic", "vic", "act")
>statefac<-factor(state)

now if i use levels function to print factor levels they are shown
sorted by alphabetical order. the output is shown below

>levels(statefac)
[1] "act" "nsw" "nt" "qld" "sa" "tas" "vic" "wa"

I WANT THE FACTOR LEVELS TO BE SORTED IN ORDER OF DESCENDING DATA
FREQUENCY IN EACH LEVEL. IN OTHER WORDS I WANT THE LEVEL WHICH HAS THE
HIGHEST FREQUENCY IN STATE TO APPEAR FIRST, FOLLOWED BY ONE WHICH HAS
THE SECOND HIGHEST FREQUENCY AND SO ON.

Any help will be appreciated


-- 
Regards,
Rana Shoaaib Mehmood