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2002 Jan 09
2
Creating subsets with factors
Hi all, I don't understand the following output. I've created a data subset from a data frame by > p1.sub <- subset(p1.dat, vp!="p1") this is ok. But > attach(p1.sub) > vp [1] p1ab p1ab p1ab p1ab p1ab p1br p1br p1br p1br p1br p1kf p1kf p1kf p1kf p1kf [16] p1mg p1mg p1mg p1mg p1mg p1mw p1mw p1mw p1mw p1mw Levels: p1 p1ab p1br p1kf p1mg p1mw shows me that the factor vp has 6 levels instead of 5? 5 should be the correct number of levels, because p1 isn't in the data subse...