[R] TukeyHSD fails on my data

[Gav Wood]

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