Add a new level to a factor and substitute existing one

Question

I\'m having a big trouble on dealing with levels names of a data frame.

I have a big data frame in which one of the colums is a factor with a LOT of levels.

Answer 1

You can edit the levels of the factor variable:

levels(df$col_foo) <- c(levels(df$col_foo),"bar2_X","bar3_X")

and then change the repeated levels to one of the new levels you added.