Nothing
# Thanks: Chris Andrews <chrisaa@med.umich.edu>
require(survival)
left <- c(1, 3, 5, NA)
right <-c(2, 3, NA, 4)
Surv(left, right, type='interval2')
survreg(Surv(left, right, type='interval2') ~ 1)
require(rms)
Surv(left, right, type='interval2') # err
args(Surv)
psm(Surv(left, right, type='interval2') ~ 1)
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