hi: here is one solution: cat<-as.factor(c(1,1,3,2,4)) model.matrix(~cat-1,cat)
cbind(cat,model.matrix(~cat-1,cat)) Andrija On Tue, Apr 12, 2011 at 2:17 PM, Shane Phillips <sphill...@lexington1.net>wrote: > I have a categorical variable in a dataframe similar to the following... > > cat > 1 > 1 > 3 > 2 > 4 > > I need to convert it to 4 dichotemous variables for each observations > like... > > cat1 cat2 cat3 cat4 > 1 0 0 0 > 1 0 0 0 > 0 0 1 0 > 0 1 0 0 > 0 0 0 1 > > > Thanks in advance! > > Shane > > ______________________________________________ > 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<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.
