Converting a categorical variable to multiple dichotemousvariables
Hi Shane, An alternative is: cat<-as.factor(c(1,1,3,2,4)) outer(cat, levels(cat), "==")+0 Cheers, Pablo ----- Original Message ----- From: "andrija djurovic" <djandrija at gmail.com> To: "Shane Phillips" <SPhillips at lexington1.net> Cc: <r-help at r-project.org> Sent: Tuesday, April 12, 2011 2:32 PM Subject: Re: [R] Converting a categorical variable to multiple dichotemousvariables
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 <SPhillips at 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
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______________________________________________ R-help at 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.