Sorry, Rather, it should be: wtd.quantile(Everybody$BMXHT, weights=Everybody$ourWeight, 0.05) Thanks again, Brian. -- View this message in context: http://r.789695.n4.nabble.com/Combining-Data-Sets-w-Weights-tp2543167p2543998.html Sent from the R help mailing list archive at Nabble.com.