[R] Adding columns to a grouped data frame

From: filip rendel <filip61_at_hotmail.com>
Date: Thu, 10 Apr 2008 07:49:02 +0000

Hello! I'm working with a big data set of patients. The data consists of different variables sorted rowwise for each patient. Now I want to add a new variable for each patient by adding two different variables of the data frame.

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