g12 Chapter Introduction – a description of the Chapter and an overview of the algorithms available
| Function Name | Mark of Introduction | Purpose | 
| g12aac Example Text Example Data | 4 | nag_prod_limit_surviv_fn Computes Kaplan–Meier (product-limit) estimates of survival probabilities | 
| g12abc Example Text Example Data | 23 | nag_surviv_logrank Computes rank statistics for comparing survival curves | 
| g12bac Example Text Example Data | 6 | nag_surviv_cox_model Fits Cox's proportional hazard model | 
| g12zac Example Text Example Data | 7 | nag_surviv_risk_sets Creates the risk sets associated with the Cox proportional hazards model for fixed covariates |