I will hit my own ball on this one
tapply(Df$Rate,list(Df$Bin,Df$Type),sum) -- View this message in context: http://r.789695.n4.nabble.com/Summarize-by-two-or-more-attributes-tp3529825p3530034.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.