[R] Partial aggregate on sorted data

Yves Moisan ymoisan at groupesm.com
Wed Oct 24 21:50:17 CEST 2007

>why not:
>aggregate(myDataframe$TargetValue,list(SomeFactor =
  myDataframe$SomeFactor),function(x) mean(x[x>quantile(x,.66)]))

Great stuff.  Just what I was looking for !  Thanx a lot !!
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