Description Usage Arguments Author(s) References Examples

Calculate the average hazard ratios according to Kalbfleisch and Prentice (1981) or in the paper Hasegawa (2014) for piece-wise exponential survival functions (only one change point `eps`

).

1 | ```
avg.haz(theta, eps, lambda, p = 1/2)
``` |

`theta` |
hazard ratio after eps between the treatment and the control group, assuming that the hazard rato is 1 before eps. |

`eps` |
The change point, before which, the hazard ratio is 1, and after which, the hazard ratio is theta. |

`lambda` |
The constant hazard for the control arm. |

`p` |
Treatment assignment probability. |

Lili Wang

Hasegawa, T. (2014). Sample size determination for the weighted log‐rank test with the Fleming–Harrington class of weights in cancer vaccine studies. Pharmaceutical statistics, 13(2), 128-135.

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