Dear all,

I have a data.frame with a factor collumn with about 10 levels.
After extract a subset of this data.frame, by selecting 2 of my 10 levels, the new data.frame continue with original number of levels. How can I adjust it in a manner that when I try levels(my.df) I receive the actualyzed number of levels?

By the way, I read my file using reab.table.

I tryed solve it with :  levels(my.df$my.var)<-unique(my.df$my.var) but the problem remain.

Many thanks,

miltinho
Brazil



 para armazenamento!

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