OptInterim (version 3.0.1)

weibull.plot: Plot Weibull Survival Curves

Description

Plot Weibull survival curves with differences at a target time highlighted. Designed for use with the param values input to function OptimDes.

Usage

weibull.plot(param, x, l.type = 1:3, l.col = c("blue", "red"), ...)

Arguments

param

Events should be defined as poor outcomes. Computations and reporting are based on the proportion without an event at a pre-specified time, x. For constructing an optimal design, complete event-free distributions at all times must be specified for the control condition (Null), and for the alternative "effective" treatment. Weibull distributions are currently implemented. param is a vector of length 4: (shape null, scale null, shape alternative, scale alternative). The R parameterization of the Weibull distribution is used.

x

Pre-specified time for the event-free endpoint (e.g., 1 year).

l.type

Line types for the plot. Default is 1-3.

l.col

Line colors for the plot. Default is "blue" for the null survival curve, "red" for the alternative survival curve.

...

Further graphical arguments, see plot.default.

References

Johnson, N. L., Kotz, S. and Balakrishnan, N. (1995) Continuous Univariate Distributions, volume 1, chapter 21. Wiley, New York.

See Also

dweibull, OptimDes, weibPmatch

Examples

param <- c(1, 1.09, 2, 1.40)
x <- 1

weibull.plot(param,x)