bradleyd wrote > That does it, thanks. Do you think you help me a little bit further? > > I actually have 4 columns, YEAR, DAY, TEMP , and IBI. They are all > numeric. I need to calculate the average TEMP and IBI values between the > 10% and 90% quantiles for each YEAR. > > The code * > by(data$day,data$year,day,c(0.1,0.9)) * > was correct in that it calculated the quantile values as intended, but I > don't know how to then calculate the mean TEMP and IBI values encompasses > within those quantiles. > > Thanks again, > David
have a look at trim argument of the mean function ?mean Pete -- View this message in context: http://r.789695.n4.nabble.com/Quantiles-of-a-subset-of-data-tp4659063p4659086.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.
