R: Function to plot the stopping bounds of an adaptive two-stage...

plotBounds {adaptTest}

R Documentation

Function to plot the stopping bounds of an adaptive two-stage test

Description

This function plots the stopping bounds of an adaptive two-stage test.

Usage

plotBounds(a1 = 0, a0 = 1, add = TRUE, xlab = NA, ylab = NA, ...)

Arguments

`a1`	alpha1, the efficacy stopping bound and local level of the test after the first stage (default: no stopping for efficacy)
`a0`	alpha0, the futility stopping bound (default: no stopping for futility)
`add`	logical determining whether the bounds should be added to an existing plot (default) or a new plot should be opened
`xlab`	a label for the x axis (default: no label)
`ylab`	a label for the y axis (default: no label)
`...`	arguments to be passed on to the underlying `lines` functions (e.g., graphical parameters)

Details

This function plots the stopping bounds alpha1 and alpha0 of an adaptive two-stage test, either onto an existing plot or into a new plot.

Value

The function plotBounds is invoked for its plotting effect; it returns no meaningful value.

Note

Note that in this implementation of adaptive two-stage tests, early stopping bounds are not part of the conditional error function. Rather, they are specified separately (see also tsT).

Author(s)

Marc Vandemeulebroecke

Examples

## Example from Bauer and Koehne (1994): full level after final stage, alpha0 = 0.5
alpha  <- 0.1
alpha2 <- 0.1
alpha0 <- 0.5
alpha1 <- tsT(typ="b", a=alpha, a0=alpha0, a2=alpha2)
plotCEF(typ="b", a2=alpha2, add=FALSE)
plotBounds(alpha1, alpha0)

[Package adaptTest version 1.0 Index]