Prof Brian Ripley <ripley <at> stats.ox.ac.uk> writes: > > We don't have the data (nothing useful was attached - see the posting > guide for what you can attach), but it looks like you should be using the > 'which' argument to TukeyHSD. > > > But I get this back: > > > > Error in rep.int(n, length(means)) : unimplemented type 'NULL' in 'rep' > > In addition: Warning messages: > > 1: non-factors ignored: task in: replications(paste("~", xx), data = mf) > > 2: non-factors ignored: id in: replications(paste("~", xx), data = mf) > > > > Can anyone shed any light on the situation?
The problem was, as Jeff Laake adroitly pointed out, I had failed to tell R that the latter two independents were factors. It was easliy fixed with as.factor(). Thanks folks, Gav ______________________________________________ R-help@stat.math.ethz.ch 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.