[R] Matrix of dummy variables from a factor

[Liaw, Andy]

See ?model.matrix.

HTH,
Andy

From: Charles H. Franklin
> 
> What is a simple way to convert a factor into a matrix of 
> dummy variables?
> 
> fm<-lm(y~f)
> 
> 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
> 
> -- 
> 
> 
>  Charles H. Franklin
>  Professor, Political Science
>  University of Wisconsin, Madison
>  franklin at polisci.wisc.edu
>  chfrankl at wisc.edu
>  608-263-2022 (voice)
>  608-265-2663 (fax)
> 
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