Hi R Users, When I use package nlme for linear model with random effects, there exists errors and I don't know the data structure of lme. Here is my data:
Rice<-data.frame(Yield=c(8,7,4,9,7,6,9,8,8,8,7,5,9,9,5,7,7,8,8,8,4,8,6,4,8,8,9), Variety=rep(rep(c("A1","A2","A3"),each=3),3), Stand=rep(c("B1","B2","B3"),9), Block=rep(1:3,each=9)) Rice.lme<-lme(Yield ~ Variety + Stand + Block,data=Rice) And error will be like below: Wrong at getGroups.data.frame(dataMix, groups) : Invalid formula for groups can you give me some advice and you will be appreciated. Thanks. Wenjun. [[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.