What about baseline[baseline$id %in% follow.up$id, ]
or the same thing but using subset(). Sarah On Fri, Apr 27, 2012 at 4:36 PM, justin jarvis <littledude.jar...@gmail.com> wrote: > Hello all, > I'm almost embarrassed to post this , it seems so easy. Suppose I have a > baseline and follow up survey but some people are missing in the follow up: > >> baseline<-data.frame(id=c(3,5,7,9,12), data= runif(5)) >> follow.up<-data.frame(id=c(3,7,9,12), data= runif(4)) >> baseline > id data > 1 3 0.66771988 > 2 5 0.28794744 > 3 7 0.01892821 > 4 9 0.64863175 > 5 12 0.86485882 >> follow.up > id data > 1 3 0.8237210 > 2 7 0.8140544 > 3 9 0.8803674 > 4 12 0.8031520 > > Here, in follow up we are missing person #5. I need to delete him from the > baseline, so that I have an equal number of rows once again. Obviously > > baseline<-baseline[-2,] won't cut it here, since in my data set I have > thousands of people. > > Thanks in advance > > Justin -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.
