Xin <jasonshi510 <at> hotmail.com> writes:
> > y<-data[,7] > x<-data[,3] > > I want to know the mean of y if corresponding x=1. > Try this: mean(data[data[,3]==1,data[,7]) You can also look at ?subset. ______________________________________________ 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.
