This function caculates the minimum sample size of each partition when the number of subgroups is given.

1 | ```
count.mindat(formula, data, part = 10)
``` |

`formula` |
a Formula object with a response on the left hand side of the '~' operator, and the covariate terms on the right side. The response has to be a survival object with survival time and censoring status in the Surv function. For more details, see Formula page. |

`data` |
a data frame with variables used in formula. It needs at least three variables including survival time, censoring status, and a covariate. Multivariate covariates can be supported with "+" sign. |

`part` |
a numeric object to determine the number of subgroups we want to split. |

1 2 3 4 | ```
data(toy)
count.mindat(Surv(time,staus) ~ meta, data = toy, part =5)
count.mindat(Surv(time,staus) ~ meta, data = toy, part =10)
count.mindat(Surv(time,staus) ~ meta, data = toy)
``` |

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