Chris Bennett wrote: > How do you remove one of the terms from an ordered polynomial contrast in > your linear model. For example, I have significant terms for linear and > cubic but not quadratic, how would i remove the quadratic term from > lm(response~treatment) > > Cheers, > Chris > Are you _sure_ you want to do that? The interpretation can get tricky, but if you insist, just set the contrast matrix for the term accordingly, e.g.,
C(myterm, contr.poly(4)[,-2]) -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
