adaptTest (version 1.1)

plotBounds: 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, ...)

Value

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

Arguments

a1

\(\alpha_1\), the efficacy stopping bound and local level of the test after the first stage (default: no stopping for efficacy)

a0

\(\alpha_0\), 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)

Author

Marc Vandemeulebroecke

Details

This function plots the stopping bounds \(\alpha_1\) and \(\alpha_0\) of an adaptive two-stage test, either onto an existing plot or into a new plot.

See Also

adaptTest package description, plotCEF

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)