You can't find a way to get the 3 column result by setting the aggregate function. data.frame(res[1], res[[2]],check.names = F) ----- A R learner. -- View this message in context: http://r.789695.n4.nabble.com/aggregate-with-non-scalar-functions-tp2313987p2314063.html Sent from the R help mailing list archive at Nabble.com.