I have a value arm_index which contains 46095 strings. If you do
> unique(arm_index)
[1] "NULL" "CMT1Y" "TREAS6M" "LIBOR6M" "LIBOR1Y" "COFI11TH" "CMT5Y" "TREAS1M"
[9] "CMT3Y" "LIBOR1M" "CMT6M" "PRIMEWSJ"
> length(arm_index)
[1] 46095
I want to find out how many times each unique value appearing here. Like the string "CMT1Y", how many times this string appearing. I am relatively new to R and done some research but couldn't find anything useful. Any suggestion will be greatly appreciated.