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...ve the same dates) subset(x,!duplicated(x$date_)) works for just one ID, but i am having trouble figuring out how to apply this to each subset of IDs (and retaining the original data.frame structure) -- View this message in context: http://r.789695.n4.nabble.com/Subsetting-subsets-of-data-frames-tp2245556p2245556.html Sent from the R help mailing list archive at Nabble.com.