
Hello:
 
I'm trying to use levels function, but I don't know why it's returning NULL. For example:
 
> temp[1]  3  5  5 NA> levels(temp)NULL>
 
Also, I've tried: 
> list(temp)[[1]][1] "3" "5" "5" NA 
> levels(list(temp))NULL
Is there a specific requirement on the parameter?
 
Karen
 
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