Dear Daren, Try this:
tapply(t[,"value"],t[,"id"],mean) HTH, Jorge On Tue, Jun 10, 2008 at 11:37 AM, Daren Tan <[EMAIL PROTECTED]> wrote: > > Hi, > > How do I collapse (average in the simplest case) the values of those > duplicated ids (i.e., 2, 5, 6, 9) to give a table of unique ids ? > > t <- cbind(id=c(1:10, 2,5,6,9), value=rnorm(14)) > > > > _________________________________________________________________ > > > [[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.
