-- Forwarded message --
From: John-Paul Bogers
Date: Sat, Jun 26, 2010 at 10:14 PM
Subject: Re: [R] Recoding dates to session id in a longitudinal dataset
To: jim holtman
Dear Jim,
he data concerns HPV screening data.
The data looks as follows
pat1 sampledate1 HPV16 0.3
pat2
Hi,
I'm fairly new to R but I have a large dataset (30 obs) containing
patient material. Some patients came 2-9 times during the three year
observation period. The patients are identified by a unique idnr, the
sessions can be distinguished using the session date. How can I recode the
date of t
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