[R] aov documentation page: question
Dear all I was looking at the aov documentation page and came across the following which seems like a contradiction to me: This provides a wrapper to |lm| for fitting linear models to balanced or unbalanced experimental designs. (I presume 'This' refers to aov) and |aov| is designed for balanced designs, and the results can be hard to interpret without balance So, do I use it for unbalanced designs? Thanks, AJ -- Dr Albertus J. Smit (Marine Ecologist/Algal Biologist) School of Biology and Conservation Science Faculty of Science University of KwaZulu-Natal Westville Campus P/B X54001 Durban 4000 South Africa Tel. (031) 260 7472 Fax (031) 260 7364 Please find our disclaimer at http://www.ukzn.ac.za/disclaimer gwavasig__ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] aov documentation page: question
On Mon, 25 Oct 2004, AJ Smit wrote: I was looking at the aov documentation page and came across the following which seems like a contradiction to me: This provides a wrapper to |lm| for fitting linear models to balanced or unbalanced experimental designs. (I presume 'This' refers to aov) and |aov| is designed for balanced designs, and the results can be hard to interpret without balance and that is part of a Note, not even a whole sentence of it. In particular, the note has extra force for the multistratum designs mentioned there. So, do I use it for unbalanced designs? You _can_ use it, but the results _can_ be hard to interpret. That is not a `contradiction' -- perhaps you need to consult your dictionary? You may do better to use something else, like lme(), hence the `Note'. -- 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, UKFax: +44 1865 272595 __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] aov documentation page: question
AJ Smit [EMAIL PROTECTED] writes: Dear all I was looking at the aov documentation page and came across the following which seems like a contradiction to me: This provides a wrapper to |lm| for fitting linear models to balanced or unbalanced experimental designs. (I presume 'This' refers to aov) and |aov| is designed for balanced designs, and the results can be hard to interpret without balance So, do I use it for unbalanced designs? If you know how to interpret the results... In general, I would avoid it if there is unbalance in the random effects, but some designs with unbalance in the fixed effects are manageable. -- O__ Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 __ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
