getLambdaStepFunction: Get Lambda Step Function

In rpact: Confirmatory Adaptive Clinical Trial Design and Analysis

Get Lambda Step Function

Description

Calculates the lambda step values for a given time vector.

Usage

getLambdaStepFunction(timeValues, ..., piecewiseSurvivalTime, piecewiseLambda)

Arguments

timeValues	A numeric vector that specifies the time values for which the lambda step values shall be calculated.
...	Ensures that all arguments (starting from the "...") are to be named and that a warning will be displayed if unknown arguments are passed.
piecewiseSurvivalTime	A numeric vector that specifies the time intervals for the piecewise definition of the exponential survival time cumulative distribution function (see details).
piecewiseLambda	A numeric vector that specifies the assumed hazard rate in the treatment group.

Details

The first element of the vector piecewiseSurvivalTime must be equal to 0. This function is used for plotting of sample size survival results (cf., plot, type = 13 and type = 14).

Value

A numeric vector containing the lambda step values that corresponds to the specified time values.

rpact documentation built on July 9, 2023, 6:30 p.m.