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Hi maybe ?aggregate or ?merge can help you. cheers Petr On 23 Nov 2006 at 15:18, David Kaplan wrote: Date sent: Thu, 23 Nov 2006 15:18:07 -0600 From: David Kaplan <dkaplan at education.wisc.edu> To: r-help at stat.math.ethz.ch Subject: [R] Aggregating and merging files> > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > R-project.org/posting-guide.html and provide commented, > minimal, self-contained, reproducible code.Petr Pikal petr.pikal at precheza.cz