Surv(entry-time, last-follow-up-time, status-at-last-follow-up) This works in survfit, coxph, and coxme. Left truncation is currently not implemented for survreg. In your case both times above would be "time since event". Terry T.
------- begin included message ------ I have a fairly simple question. I would like to use the survival package to perform an analysis on data where an event can have occurred before individuals were recruited into a study. I'm not sure how to do this using the Surv() function. I would have a date of an event and then the enrolment date would be after that. How do I put these two dates into the survival function? ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
