Bert, how about when making predictions of contrasts using, for example, estimable() from the gmodels package? I find it very useful.
Andrew > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Berton Gunter > Sent: Wednesday, 7 December 2005 8:27 AM > To: 'Liaw, Andy'; 'Charles H. Franklin'; r-help@stat.math.ethz.ch > Subject: Re: [R] Matrix of dummy variables from a factor > > 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 Gunter > Genentech Non-Clinical Statistics > South San Francisco, CA > > "The business of the statistician is to catalyze the scientific learning > process." - George E. P. Box -- Andrew Robinson Senior Lecturer in Statistics Tel: +61-3-8344-9763 Department of Mathematics and Statistics Fax: +61-3-8344-4599 University of Melbourne, VIC 3010 Australia Email: [EMAIL PROTECTED] Website: http://www.ms.unimelb.edu.au ______________________________________________ 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
