How to create design matrix in r -


i have 2 factors. factor have 2 level, factor b have 3 level.

how create following design matrix?

     factora1 factora2 factorb1 factorb2 factorb3 [1,]        1        0        1        0        0 [2,]        1        0        0        1        0 [3,]        1        0        0        0        1 [4,]        0        1        1        0        0 [5,]        0        1        0        1        0 [6,]        0        1        0        0        1

you have couple of options:

use base , piece yourself:

(iris.dummy<-with(iris,model.matrix(~species-1)))  (iris<-data.frame(iris,iris.dummy))

or use ade4 package follows:

dummy <- function(df) {     require(ade4)     isfact <- sapply(df, is.factor)     facts <- acm.disjonctif(df[, isfact, drop = false])     nonfacts <- df[, !isfact,drop = false]     data.frame(nonfacts, facts) }  dat <-data.frame(eggs = c("foo", "foo", "bar", "bar"),       ham = c("red","blue","green","red"), x=rnorm(4))  dummy(dat)    ##           x eggs.bar eggs.foo ham.blue ham.green ham.red ## 1 0.3365302        0        1        0         0       1 ## 2 1.1341354        0        1        1         0       0 ## 3 2.0489741        1        0        0         1       0 ## 4 1.1019108        1        0        0         0       1

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