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...sed on the observations at the state level using a loop. Whichever way is best and easiest. I hope that this example is understandable. Any help or direction would be greatly appreciated!!! Thanks, Carlos -- View this message in context: http://r.789695.n4.nabble.com/looping-by-grouping-variable-tp3781580p3781580.html Sent from the R help mailing list archive at Nabble.com.