Tena koe Jim ?aggregate
HTH .... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of jimdare > Sent: Friday, 6 November 2009 2:54 p.m. > To: r-help@r-project.org > Subject: [R] Calculate Mean for each Treatment/Trial Interaction in DF > > > Hi, > > I am create a new DF that summarizes the mean angle per > treatment/trial, of the original DF (see below). I have had > some success using: > (tapply(df$Angle, INDEX=interaction(df$State, df$Trial), > FUN=mean)); however, this gives the answer as a list, which > means I would have to split the name to get the categories back. Does > anyone know a simple way to transform the Original DF into > Summary DF? > > Thanks in advance, > > James > > > Original DF > > > df > Angle Trial Treatment > 1 43.1297 1 C > 2 62.3613 1 C > 3 88.2767 2 C > 4 75.2431 2 C > 5 91.3668 3 C > 6 61.2800 3 C > 7 55.5575 1 U > 8 69.4661 1 U > 9 67.5512 2 U > 10 95.5528 2 U > 11 75.8689 3 U > 12 66.9070 3 U > > Summary DF > > > sdf > > Angle Trial Treatment > 1 52.7455 1 C > 2 ... 2 C > 3 ... 3 C > 4 ... 1 U > 5 ... 2 U > 6 ... 3 U > > -- > View this message in context: > http://old.nabble.com/Calculate-Mean-for-each-Treatment-Trial- > Interaction-in-DF-tp26225533p26225533.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
