powerplot {grpseq}

Plot the power function of the planned analysis

Description

Plot the power curve of the planned futility analysis as a function of the effect size (in units of the hypothesized effect size).

Usage

powerplot(
  x,
  ref = FALSE,
  add = FALSE,
  lty = 1,
  ref.lty = 2,
  lwd = 1,
  xlab = expression(delta),
  ylab = "Power",
  main = "Power curve of the planned futility analysis",
  xlim = c(0, 1.5),
  ylim = c(0, 1),
  ...
)

Arguments

x

An object returned by fut.

ref

If TRUE, power curve of the reference test (one that ignores the futility boundaries) will be overlaid.

add

If TRUE, the curve will be overlaid on an existing plot; otherwise, a separate plot will be constructed.

lty

Line type for the power curve of the futility analysis.

ref.lty

Line type for the power curve of the reference if ref=TRUE.

lwd

Line width.

xlab

A label for the x axis, defaults to a description of x.

ylab

A label for the y axis, defaults to a description of y.

main

A main title for the plot.

xlim

The x limits of the plot.

ylim

The y limits of the plot.

...

Other arguments that can be passed to the underlying plot method.

Value

No return value, called for side effects.

See Also

fut, summary.fut, plot.fut.

Examples

# see example for fut