Hi Yuan, It is not ellegant, but may work for you..
f<-as.factor(c("a","b","a")) f.freq<-data.frame(table(f)) f.freq lower.freq<-2 f.freq.subset<-subset(f.freq,f.freq$Freq>=lower.freq) f.freq.subset f.selected<-f[f %in% f.freq.subset$f] f.selected<-factor(f.selected) f.selected Best wishes, miltinho astronauta brazil On 8/29/08, Yuan Jian <[EMAIL PROTECTED]> wrote: > > Hi, > > how to remove levels that have less than a specific number such as 2. i.e.. > > > f<-as.factor(c("a","b","a")) > > f > [1] a b a > Levels: a b > > I want to remove level b because level b has less than 2. > > f > [1] a a > Levels: a > > > > > > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.