📖 Kaplan-Meier Estimator

$\\hat{S}(t) = \\prod_{j: t_j \\leq t}\\left(1 - \\frac{d_j}{r_j}\\right)$ where $d_j$ is number of events at time $t_j$ and $r_j$ is number at risk just before $t_j$.

From: Intro to Statistical Learning

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