This function estimates *Pr\{T > t_0\}* by the Kaplan-Meier
estimator. *t_0* should be given.

1 | ```
get.surv.km(time, event, t0, subs = NULL)
``` |

`time` |
Vector of follow up times. |

`event` |
Vector of event indicators, 1 for event of interest, 0 for censoring. |

`t0` |
Scalar value indicating a time to determine evnet/non-event ( |

`subs` |
Vector of logical values to determine which subjects to be used for
a calculation. When this option is not specified
( |

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