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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