thx I was struggling with the DF[,3:4] part of it On Sun, Apr 25, 2010 at 10:47 AM, John Kane <jrkrid...@yahoo.ca> wrote:
> Here's one way with aggregate() > > library(car) # You probably will need to install it. > > aggregate(DF[,3-4], by=list(years), mean,na.rm=TRUE) > > recode(x, "c(1,2)='A'; else='B'") > > DF$years <- recode(DF$years, "c(5,6,7)= '5-7'") > > DF > > > You may also want to have a look at the reshape and plyr packages. > > --- On Sun, 4/25/10, steven mosher <mosherste...@gmail.com> wrote: > > > From: steven mosher <mosherste...@gmail.com> > > Subject: [R] Noobie question on aggregate tapply and by > > To: "r-help" <r-help@r-project.org> > > Received: Sunday, April 25, 2010, 2:29 AM > > I have a 43MB dataframe ( 5 > > variables) and I'm trying to summarize subsets > > of the data. > > I've RTFM ( not very clear) and looked at a variety of > > samples but cant seem > > to figure out > > how to make these functions work. > > > > A sample of what I want to do would be this: > > > > ids<-seq(1,50) > > years<-c(rep(5,10),rep(6,10),rep(7,10),rep(8,20)) > > > > data<-c(rep(23.2,7),rep(14.2,17),rep(29.2,6),rep(13.4,10),rep(16.3,5), > > NA, > > rep(40,4)) > > data2<-c(rep(22.2,5),rep(13.2,8),NA, > > rep(29.8,16),rep(12.4,10),rep(16.3,5), > > rep(38,5)) > > DF<-data.frame(ids,years,data,data2) > > > > That will give you a dataframe that is a good analog of > > what I have. i > > would like to calculate means > > ( with NA removed na.rm) for each level of years. > > > > data data2 > > 5 xx. > > yy. > > 6 xx > > yz > > 7 ... > > ,,, > > 8 .. > > ... > > > > And then things like this: > > > > 5-7 : xx yy > > 8 : xy > > zz > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > > > > [[alternative HTML version deleted]] ______________________________________________ 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.
