On Dec 6, 2005, at 3:27 PM, Berton Gunter wrote: > But note: There are (almost?) no situations in R where the dummy > variables > coding is needed. The coding is (almost?) always handled properly > by the > modeling functions themselves. > > Question: Can someone provide a "straightforward" example where the > dummy > variable coding **is** explicitly needed? >
Bert's question offers an opportunity for me to mention (again) my long standing wish for someone to write a version of model.matrix that directly produced a matrix in one of the common sparse matrix formats. This could be a good project for one of you who like using ";" ? Roger url: www.econ.uiuc.edu/~roger Roger Koenker email [EMAIL PROTECTED] Department of Economics vox: 217-333-4558 University of Illinois fax: 217-244-6678 Champaign, IL 61820 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
