On Tue, 22 Feb 2005, Christoph Buser wrote:
Dear Prof Ripley, Dear Prof Dalgaard
Thank you both for your help. I tried it with helmert contrasts and got a result that is consistent with lme. I didn't realize that the parameterization of the model has an influence on the contrasts that I tried to test. It seems that I should read a little bit more about this issue for my better understanding.
I have one last point to propose:
You could include (as interim solution) a warning (that there might be an in efficiency loss) in se.contrast() if one uses non-orthogonal contrasts and a multi-stratum model.
If you meant on the help page, I have already done that.
We are still thinking about how to detect the problem well enough, and possibly even to see if we can avoid it.
It's trickier than I remembered, although I think I did probably once know.
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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