On Tue, Jun 15, 2010 at 9:47 AM, Farhad Shokoohi <stat...@gmail.com> wrote: > Dear All, > I have a problem running this program on R. Z is a matrix of spline which is > random >> fit<-lme(anc~X,random=pdIdent(~Z)) > Error in getGroups.data.frame(dataMix, groups) : > Invalid formula for groups > What I have done wrong? You didn't read the posting guide. http://www.R-project.org/posting-guide.html A little more information on the data is necessary. Please provide minimal, self-contained, reproducible code that mimicks the error.
This said, I do not understand what you want to do with "random=pdldent(~Z)". I cannot find a function pdldent, so this notation doesn't make any sense. Cheers Joris > > ______________________________________________ > 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. > -- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php ______________________________________________ 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.
