> From: Peter Dalgaard > > "Trevor Hastie" <[EMAIL PROTECTED]> writes: > > > This does not: > > > > > model.matrix(~I(pos>3),data=data.frame(pos=c(1:2))) > > Error in "contrasts<-"(`*tmp*`, value = "contr.treatment") : > > contrasts can be applied only to factors with 2 or more levels > > Oh yes it does:
Ditto here. (WinXPPro/R-1.9.0/P3) Andy > > model.matrix(~I(pos>3),data=data.frame(pos=c(1:2))) > (Intercept) I(pos > 3)TRUE > 1 1 0 > 2 1 0 > attr(,"assign") > [1] 0 1 > attr(,"contrasts") > attr(,"contrasts")$"I(pos > 3)" > [1] "contr.treatment" > > (RedHat,SuSE,x86,amd64) > > -- > O__ ---- Peter Dalgaard Blegdamsvej 3 > c/ /'_ --- Dept. of Biostatistics 2200 Cph. N > (*) \(*) -- University of Copenhagen Denmark Ph: > (+45) 35327918 > ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: > (+45) 35327907 > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
