This function just calls Surv() from the survival package.

Surv(time, time2, event, type = c("right", "left", "interval", "counting",
  "interval2", "mstate"), origin = 0)



for right censored data, this is the follow up time. For interval data, the first argument is the starting time for the interval.


ending time of the interval for interval censored or counting process data only. Intervals are assumed to be open on the left and closed on the right, (start, end]. For counting process data, event indicates whether an event occurred at the end of the interval.


The status indicator, normally 0=alive, 1=dead. Other choices are TRUE/FALSE (TRUE = death) or 1/2 (2=death). For interval censored data, the status indicator is 0=right censored, 1=event at time, 2=left censored, 3=interval censored. For multiple endpoint data the event variable will be a factor, whose first level is treated as censoring. Although unusual, the event indicator can be omitted, in which case all subjects are assumed to have an event.


character string specifying the type of censoring. Possible values are "right", "left", "counting", "interval", "interval2" or "mstate".


for counting process data, the hazard function origin. This option was intended to be used in conjunction with a model containing time dependent strata in order to align the subjects properly when they cross over from one strata to another, but it has rarely proven useful.