You might use the plyr package to get group-wise weighted means library(plyr) ddply(mydata,~group,summarise, b=mean(weights), c=weighted.mean(response,weights))
hth david freedman -- View this message in context: http://r.789695.n4.nabble.com/Using-summaryBy-with-weighted-data-tp3220761p3221212.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.
