Method | Model name | Model description | Parameter Description |

Parameter method | Weibull distribution model |
| F(t) is density function, s(t) is survival number; $\lambda ,\beta $ is control curve shape parameters; t is analysis time |

Semiparametric method | Weibull distribution model |
| ${h}_{0}t$ is Benchmark risk function; ${\beta}_{n}$ is overall regression coefficient |

Nonparametric method | Kaplan-Meier model |
| P is estimated survival rate for each time; n is total number of individuals observed; d is number of deaths |