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Message-ID: <CAMPDo07d-q3Zf=AZJH2=KZ1oDswHcfebc9sqgjo6pHDjQ9+RCA@mail.gmail.com>
Date: 2013-02-05T19:48:39Z
From: marta Garcia
Subject: [R-es] Error en fix.by(by.x, x) : 'by' must specify valid column(s)
In-Reply-To: <CAOKbq8j5xadpc70kW8TCQq0BL-WPEC1jRURMCJQHZo5bhqSAXA@mail.gmail.com>

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