[R] 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 Zürich Institut für Pflanzenwissenschaften ETH Zentrum, LFW A 2 Telefon: 044 632 85 97 Telefax: 044 632 11 53 e-mail: [EMAIL PROTECTED] http://www.ipw.agrl.ethz.ch/~svfelten/ und: Universität Zürich Institut für Umweltwissenschaften Winterthurerstrasse 190 8057 Zürich Telefon: 044 635 61 23 Telefax: 044 635 57 11 e-mail: [EMAIL PROTECTED] http://www.unizh.ch/uwinst/homepages/steffi.html __ R-help@stat.math.ethz.ch 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] tapply with unequal length of arguments
2006/3/12, Stefanie von Felten, IPW&IfU <[EMAIL PROTECTED]>: > 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)? Yes,It works. > I tried tapply(x,y,mean,na.omit=T) but it doesn't work! What does "it doesn't work" mean exactly?Can you give an example and the error msg? > Steffi > -- > - > Stefanie von Felten > Doktorandin > > ETH Zürich > Institut für Pflanzenwissenschaften > ETH Zentrum, LFW A 2 > > Telefon: 044 632 85 97 > Telefax: 044 632 11 53 > e-mail: [EMAIL PROTECTED] > http://www.ipw.agrl.ethz.ch/~svfelten/ > > und: > > Universität Zürich > Institut für Umweltwissenschaften > Winterthurerstrasse 190 > 8057 Zürich > > Telefon: 044 635 61 23 > Telefax: 044 635 57 11 > e-mail: [EMAIL PROTECTED] > http://www.unizh.ch/uwinst/homepages/steffi.html > > __ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > -- 黄荣贵 Deparment of Sociology Fudan University __ R-help@stat.math.ethz.ch 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] tapply with unequal length of arguments
Stefanie von Felten, IPW&IfU wrote: > 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! See ?tapply which tells you that the argument "..." is passed to FUN which is mean() in this case. mean() has an argument "na.rm", see ?mean. So we get: tapply(x, y, mean, na.rm = TRUE) Please read the help pages more carefully. Uwe Ligges > Steffi __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
