[R] Matrix of dummy variables from a factor

Uwe Ligges ligges at statistik.uni-dortmund.de
Tue Dec 6 22:05:51 CET 2005

Charles H. Franklin wrote:

> What is a simple way to convert a factor into a matrix of dummy variables?
> fm<-lm(y~f)


Uwe Ligges

> where f is a factor takes care of this in the estimation. I'd like to 
> save the result of expanding f into a matrix for later use.
> Thanks.
> Charles

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