Re: [R] Converting a categorical variable to multiple dichotemousvariables

2011-04-12 Thread Dr. Pablo E. Verde
: 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 sphill...@lexington1.netwrote: I have

Re: [R] Converting a categorical variable to multiple dichotemousvariables

2011-04-12 Thread Shane Phillips
-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

Re: [R] Converting a categorical variable to multiple dichotemousvariables

2011-04-12 Thread Jeremy Hetzel
Shane, Does this work? # Your simulated data subject=1:1000 treat=rbinom(1*1000,1,.13) gender=rbinom(1*1000,1,.5) eth=runif(1*1000, min=1, max=4) cogat=rnorm(1*1000, 100, 16) map=rnorm(1*1000, 200, 9) growth=0 simtest=data.frame (subject=subject, treat=treat, gender=gender,