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Mar 10, 2015 at 2:39 comment added Aleksandr Blekh I just re-read your answer and I'm taking my words about the levels back - sorry about misreading the text. I probably need a cup of coffee right away :-).
Mar 10, 2015 at 2:35 comment added Aleksandr Blekh I might be wrong, but I've had an impression that the OP is interested in dropping factor levels as opposed to variables themselves. Nevertheless, your answer is nice (+1).
Mar 10, 2015 at 1:40 history answered Penguin_Knight CC BY-SA 3.0