Description Usage Arguments Details Value Author(s)

Some basic functions for information prediction.

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`theta` |
Hazard ratio after the change point (before the change point HR should be 1). |

`lambda` |
Event hazard for the control arm. |

`eps` |
Change point. |

`e` |
Some convenience parameter to control the change point, which is usually set to be eps or tau |

`k, k1, k2, m` |
Parameters to control the exponential power of the survival functions (the control arm for the null hypothesis or the weighted sum of two arms for the alternative hypotheiss). |

`R` |
End of the accrual period. |

`t.star` |
Time point we pause the study to check the cumulative results. |

`p` |
Treatment assignment probability. |

To prepare the values for the prediction of information values. The control arm is following an exponential with rate `lambda`

, the treatment arm is piece-wise exponential with hazard ratio with respect to the control arm to be 1 before the changing point `eps`

, and `theta`

after the change point.

`getc`

returns the *\exp(-λ*ε*(1-θ))* which is a multiplier for the survival and hazard of the treatment arm after the change point `eps`

.

Lili Wang

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