SurvLR: Transform Surv object to data frame with L and R values
Description
Takes a Surv object and transforms it into a data frame with
two variables, L and R, representing the left and right interval of interval censored
data. The failure time is known to be in the interval (L,R]. Right censored data
are handled by setting L=R for observed and R=Inf for right censored. These are interpreted correctly
by icfit and ictest.