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...ent of a person, so the last id of the uid, to get it to the first measurement of the next uid. Maybe this whole way of programming is around the bush, than please tell me. Greetings, Britt -- View this message in context: http://r.789695.n4.nabble.com/Survival-data-with-time-dependent-covariate-tp4619765.html Sent from the R help mailing list archive at Nabble.com.