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Message-ID: <CAKL8G3GL=NDa+zNLUAmxjmm97ahYuQSk2yn3k2BjH6N1W7rxGQ@mail.gmail.com> Date: 2012-05-03T21:44:11Z From: Jorge I Velez Subject: Identifying case by groups in a data frame In-Reply-To: <1336079941.20084.YahooMailNeo@web171204.mail.ir2.yahoo.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120503/9ad57315/attachment.pl>