Displaying 1 result from an estimated 1 matches for "p1kf".
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 subset.
Thanks, Sven
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