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Message-ID: <BANLkTim9gYR_wnwZ40BfxV-QdjiQFNqvWw@mail.gmail.com> Date: 2011-04-08T13:59:23Z From: Jorge Ivan Velez Subject: Getting number of students with zeroes in long format In-Reply-To: <BANLkTikw-A6VMH__=7OfCos0Z-ML27E25Q@mail.gmail.com> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20110408/948ecdcb/attachment.pl>