HCTDesign (version 0.7.2)

FutDesign: HCT design with interim monitoring for futiity only

Description

The group sequential design for historical controlled survival outcome trials with futility boundaries only.

Usage

FutDesign(
  k,
  alpha,
  beta,
  delta,
  d1,
  option = "OBF",
  param = 4,
  trial = "Superiority",
  delta0
)

Value

List of dataframes and vectors containing the details about the following: design of the trial which includes the number of looks and events; details about futility and efficacy boundaries which include transformed information time at each look, cumulative beta and alpha respectively, p-values and crossing probabilities; etam(drift parameter); d2max(maximum number of events in the experimental group); delta_used(hazard ratio used in the design).

Arguments

k

vector of time fraction for all planned looks: k=c(1/3,2/3,1) if the three planned looks will be carried out at 1/3, 2/3 and all of the total events in the experiment arm.

alpha

type I error.

beta

type II error.

delta

hazard ratio: hazard of experiment group over hazard of control group.

d1

total number of events in the historical control group.

option

type of spending function: "OBF", "Gamma", "Rho" or "Pocock". Default is "OBF.

param

Parameter for Gamma family or Rho family. Default value is 4.

trial

Type of trial: "Superiority" or "Non-inferiority". Default is "Superiority".

delta0

Non-inferiority margin.

Author

Tushar Patni, Yimei Li, Jianrong Wu, and Arzu Onar-Thomas.

References

doi:10.1002/pst.1756HCTDesign

doi:10.1080/10543406.2019.1684305HCTDesign

Examples

#Sequential superiority trial for three equally spaced looks for OBF spending function.
gg<-FutDesign(k=c(0.3,0.6,1),alpha=0.05,beta=0.1,delta=0.57,d1=65,option="OBF",trial="Superiority")