Re: [R] Recoding dates to session id in a longitudinal dataset

t; > 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 > >> >

[R] Recoding session date into session id in a longitudinal dataset

te of the session to a session id (1-9). This would be necessary to obtain information and do some analysis on the first occurence of a specific patient or to look for trends. Thanks JP Bogers University of Antwerp [[alternative HTML version de