R help - Jul 2011 - Cox's regression analysis with Left truncated data

Hi,

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?  

Thank you,
Natalie

-----
Natalie Van Zuydam

PhD Student
University of Dundee
nvanzuydam at dundee.ac.uk
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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?