Risk set

The risk set immediately before an event time contains the individuals who remain observed, event-free, and eligible to experience the event. For a cohort observed from time zero, with exit times

Y_{i} = min (T_{i}, C_{i})

under right censoring, write

R_{j} = {i : Y_{i} \geq t_{j}}

and

n_{j} = ∣ R_{j} ∣

. Individuals with an event or right censoring exactly at

t_{j}

are included in this denominator; process events before removing subjects right-censored at that same recorded time. Earlier right censoring removes subjects from later risk sets. With delayed entry, use the entry times too, as in the Kaplan–Meier estimator with delayed entry.

Table of contents
- At-risk process Risk set

At-risk process ( $Y (t)$ )

An at-risk process indicates or counts which individuals belong to the risk set at each time.

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