The Kaplan-Meier Estimator calculates survival probabilities at each time point where an event occurs. It considers the number of subjects at risk just before each event and adjusts for any censored data. The formula is: S(t) = Π (1 - d_i/n_i) where S(t) is the survival probability at time t, d_i is the number of events at time t_i, and n_i is the number of subjects at risk just before t_i.
