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Message-ID: <65cc7bdf0712160623k20f69089xf1d6efad05040588@mail.gmail.com> Date: 2007-12-16T14:23:19Z From: tom soyer Subject: question about the aggregate function with respect to order of levels of grouping elements An embedded and charset-unspecified text was scrubbed... Name: not available Url: https://stat.ethz.ch/pipermail/r-help/attachments/20071216/fa75d37b/attachment.pl