Søren Merser <[EMAIL PROTECTED]> writes: > hi there > > tried to use subset with drop=TRUE, but all the 'old' levels are preserved, > i.e. when calling e.g. ftable a lot of zeros are displayed > > >x<-subset(LREG, (kir=='AA' | kir=='BB') & (type=='t1' | otype=='t2'), > drop=TRUE, select=c(event, kir, type)) > > ftable(x) > > i explicit have to call factor like > >ftable(event~factor(kir)+factor(type)) > > any hints?
Yes, the drop argument is misdocumented. It actually does the same as the drop argument to [.data.frame. It was on this very list just eleven days ago, see e.g. the below ref., including what to do if you really want to get rid of unused levels http://www.mail-archive.com/[EMAIL PROTECTED]/msg22459.html (yet another interface to the archives...) -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
