sorry about the mistake - the -data$Type doesn't work: the '-' sign isn't valid for factors. I *thought* I had checked this before submitting a response !
HufferD wrote: > > On Thursday, May 07, 2009 7:45 PM, David Freedman wrote: > > > ...how about: > > d=data[order(data$ID,-data$Type),] > > d[!duplicated(d$ID),] > > Does the "-data$Type" argument to the order function work? > > -- > David > > ----------------------------------------------------- > David Huffer, Ph.D. Senior Statistician > CSOSA/Washington, DC david.huf...@csosa.gov > > ______________________________________________ > 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. > > -- View this message in context: http://www.nabble.com/by-group-processing-tp23417208p23453688.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.