Description Usage Arguments Value References Examples

The `SSR.CP()`

is used to calculate the sample size required
at the second stage and the critical value used at the final analysis. In
addition, this function can also used to conduct the conditional power
analysis in terms of *N2*

1 2 |

`Z1` |
The test statistic obtained at the interim analysis |

`delta` |
The standardized size of treatment effect, which can be estimated
by using |

`N1` |
The sample size used at the first stage |

`pstar` |
The |

`alpha` |
The overall Type I error rate |

`beta` |
The |

`N2` |
The pre-specified sample size used at the second stage, which is used to conduct the conditional power analysis |

A list contains

N2 The pre-specified sample size used at the second stage, which is used to implement the conditional power analysis

Conditional.Power The value of conditional power given the value of

`N2`

in the conditional power analysisP.Value The corresponding P-Value used at the final analysis in the conditional power analysis

N2.CP The re-estimated sample size of

`N2`

to ensure an adequate conditional powerc.CP The estimated the critical value used at the final analysis based the conditional power

Proschan MA, Hunsberger SA. Designed extension of studies based on conditional power. Biometrics 1995:1315-1324. <doi:10.2307/2533262>

1 2 3 4 5 6 7 8 |

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.