plotBounds {adaptTest} | R Documentation |
This function plots the stopping bounds of an adaptive two-stage test.
plotBounds(a1 = 0, a0 = 1, add = TRUE, xlab = NA, ylab = NA, ...)
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 |
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.
The function plotBounds
is invoked for its plotting effect; it returns no meaningful value.
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
).
Marc Vandemeulebroecke
adaptTest
package description, plotCEF
## 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)