tapply with unequal length of arguments
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 Telefon: 044 635 61 23 Telefax: 044 635 57 11 e-mail: sfelten at uwinst.unizh.ch http://www.unizh.ch/uwinst/homepages/steffi.html