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Message-ID: <CAKL8G3G05dx+cAvK_wRin4=J0DLftZLaYhuBhPZfSAK_mj7KEQ@mail.gmail.com> Date: 2012-11-22T13:03:35Z From: Jorge I Velez Subject: Trick to replace NA In-Reply-To: <50AE20E6.5030901@yahoo.fr> An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20121123/873f8b68/attachment.pl>