You should not need to write them yourself. Look at the contr.poly function along with the C function (Note uppercase C) or the contrasts function.
On Monday, July 23, 2012, Manzoni, GianMauro wrote: > Dear all, > I am quite new to R and I am having trouble writing the polynomial > contrasts for an ordinal factor in MANOVA. > # I have a model such as this > fit<-manova(cbind(Y1,Y2,Y3)~Groups,data=Events) # where groups is an > ordinal factor with 4 levels > # how to set polynomial contrasts for the "Groups" factor ? > > Thank you very much in advance for any help! > > Best regards, > Mauro > > -- > Dr. Gian Mauro Manzoni > PhD, PsyD > Psychology Research Laboratory > San Giuseppe Hospital > Istituto Auxologico Italiano > Verbania - Italy > e-mail: gm.manz...@auxologico.it <javascript:;> > cell. phone +39 338 4451207 > Tel. +39 0323 514278 > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org <javascript:;> 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. > -- Gregory (Greg) L. Snow Ph.D. 538...@gmail.com [[alternative HTML version deleted]] ______________________________________________ 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.
