The <Kaplan–Meier estimator> requires <independent censoring>: conditional on modeled covariates, censoring must carry no information about the future event time. Censoring at a common administrative data cutoff satisfies this condition when calendar entry time is independent of prognosis. Under that assumption, the month-24 analysis has valid administrative censoring despite unequal follow-up caused by staggered entry.

Solution

Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 207 / 5 / viii / Solution

 Solution (source code)