Surv object and transforms it into a data matrix with two columns, L and R,
representing the left and right points of observed time intervals. For right-censored data, R = NA.
The input Surv object should be in the form of
Surv(L,R,type='interval2'), where R = NA for right-censored data.
A data matrix with two variables:
left-points of observed time intervals
right-points of observed time intervals
Michael P. Fay, Pamela A. Shaw (2010). Exact and Asymptotic Weighted Logrank Tests for Interval Censored Data: The interval R Package. Journal of Statistical Software, 36 1-34.
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