[R] Using 'aggregate' when dependent on row value increments

Steve Murray smurray444 at hotmail.com
Thu Apr 30 18:41:28 CEST 2009


Many thanks for the very useful responses in such a short time. I'm not a former SAS user - more a naive R user who didn't realise that a sort wasn't necessary!

Jim, your solution worked really well - thanks.

Thanks again for the great solutions.

Steve




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