Hi Jim,
Thanks for the answer.
What I actually want is a session sequence 1,2,... per patient. This would
be very useful to look at trends of HPV infections from the first to the
second sample etc. It would also allow me to extract the HPV data of the
first sample (session 1).
Thx
JP
On Sat, Ju
-- 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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