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Survival analysis
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==Non-parametric estimation== The [[Kaplan–Meier estimator]] can be used to estimate the survival function. The [[Nelson–Aalen estimator]] can be used to provide a [[non-parametric statistics|non-parametric]] estimate of the cumulative hazard rate function. These estimators require lifetime data. Periodic case (cohort) and death (and recovery) counts are statistically sufficient to make nonparametric maximum likelihood and least squares estimates of survival functions, without lifetime data.
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