Extends the analysis with non-parametric and semi-parametric methods — Kaplan–Meier estimation, Nelson–Aalen cumulative hazard, formal hypothesis testing, full Cox regression with diagnostics, model refinement for PH violations, and a comprehensive synthesis integrating all three analytical frameworks.

Parametric survival analysis of the rats dataset using R. Covers Kaplan–Meier estimation, Cox regression, parametric model selection (Weibull best by AIC), life functions, and frailty modelling to account for litter clustering.

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