Plot for Group Sequential Boundaries

Description

Plot of the sequential boundaries for objects of class '"bounds"' or '"drift"'.

Usage

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## S3 method for class 'bounds'
plot(x, main = NULL, xlab = NULL, ylab = NULL, ...)
## S3 method for class 'drift'
plot(x, main = NULL, xlab = NULL, ylab = NULL, ...)

Arguments

x

an object of class '"bounds"' or '"drift"'.

main

an overall title for the plot: see title.

xlab

a title for the x axis: see title.

ylab

a title for the y axis: see title.

...

graphical parameters can be given as arguments to plot.

Author(s)

Charlie Casper charlie.casper@hsc.utah.edu and Oscar A. Perez

References

Reboussin, D. M., DeMets, D. L., Kim, K. M., and Lan, K. K. G. (2000) Computations for group sequential boundaries using the Lan-DeMets spending function method. Controlled Clinical Trials, 21:190-207.

Fortran program 'ld98' by the same authors as above.

DeMets, D. L. and Lan, K. K. G. (1995) Recent Advances in Clinical Trial Design and Analysis, Thall, P. F. (ed.). Boston: Kluwer Academic Publishers.

Lan, K. K. G. and DeMets, D. L. (1983) Discrete sequential boundaries for clinical trials. Biometrika, 70:659-63.

See Also

Generic functions summary.bounds and summary.drift, bounds to calculate sequential boundaries, drift for exit probabilities given boundaries or drift (effect) or confidence interval given power.

Examples

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## See 'bounds' or 'drift'.