Dr Shrink wrote: > > I need to include the repeated structure in our data set object, > recall.sums.df, before using gls function. > Thus I used groupedData. > But I encountered error messages which may mean '*' is not not meaningful > factor. >
I know that when reading Pinheiro/Bates one has the expression that groupedData is required, but I always found that concept more confusing than helpful (and it has been abandoned in nlm4). Things work much more transparent without grouped data. I suggest that you first the numeric data to factors, e.g. recall.sums.df$subj = as.factor(recall.sums.df$subj) and then try again without using grouped data. However, it looks too me that you might be better of with lme anyway, probably with random= ~1|subj. gls is a very useful and underused tool, but probably not for this data set. I also suggest that you start getting the syntax right with + instead of * first. You model could easily be strongly underspecified, which also lead to nasty error messages. Dieter -- View this message in context: http://r.789695.n4.nabble.com/Warning-messages-not-meaningful-for-factors-tp2527349p2527426.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
