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Hi everyone, Is it possible to use tapply(x,y,mean) if not all groups of x by y are of the same length (for example if you have one missing observation)? I tried tapply(x,y,mean,na.omit=T) but it doesn't work! Steffi -- --------------------------------- Stefanie von Felten Doktorandin ETH Z?rich Institut f?r Pflanzenwissenschaften ETH Zentrum, LFW A 2 Telefon: 044 632 85 97 Telefax: 044 632 11 53 e-mail: stefanie.vonfelten at ipw.agrl.ethz.ch http://www.ipw.agrl.ethz.ch/~svfelten/ und: Universit?t Z?rich Institut f?r Umweltwissenschaften Winterthurerstrasse 190 8057 Z?rich...

...or the interaction of A:B. Now you can fit A,B, and AB (as 3 main effects) in 3 different sequential models with each one of them in the end once. For the term in the end you then get type III SSQ which seem to be correct. Cheers Steffi -- --------------------------------- Stefanie von Felten Doktorandin ETH Z??rich Institut f??r Pflanzenwissenschaften Universit??tstrasse 2, LFW A2 8092 Z??rich Telefon: 044 632 85 97 Telefax: 044 632 11 53 e-mail: stefanie.vonfelten at ipw.agrl.ethz.ch Universit??t Z??rich Institut f??r Umweltwissenschaften Winterthurerstrasse 190 8057 Z??rich Telefon: 044 635 61...