you must have missing values in "data". Try tapply(data, group, mean, na.rm = TRUE)
If that's not the case, read the bottom of this email about the posting guide. HTH, --sundar On Tue, Nov 3, 2009 at 5:28 AM, FMH <kagba2...@yahoo.com> wrote: > Hi, > > I tried to use tapply function to find the mean of the data in each group as > the following command, but the result are NA, as there are several missing > values in each group. > > tapply(data,group,mean) > > Could someone please advice me the way to ignore the missing data in order > for the fucntion to run successfully? > > Thanks > > Fir > > > > > ______________________________________________ > 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. > ______________________________________________ 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.
