AGSDest (version 2.3.4)

typeIerr: type I error rate of a GSD

Description

typeIerr is a function that computes the type I error rate of a GSD.

Usage

typeIerr(GSD)

Arguments

GSD

object of the class GSTobj or list with the following elements: K = number of stages, a = vector with futility boundaries (not supported yet), b = rejection boundaries, t = vector with information fractions; see example blow.

Value

typeIerr returns the type I error rate of a GSD.

References

O'Brien, PC, Fleming, TR (1979) ''A multiple testing procedure for clinical trials'', Biometrics, 35 , 549-556

Schoenfeld, D (2001) ''A simple Algorithm for Designing Group Sequential Clinical Trials'', Biometrics, 27, 972-974

See Also

GSTobj

Examples

# NOT RUN {
##The following calculates the type I error rate of a GSD.

GSD <- list(K=4,a=rep(-8,4),b=c(4.333,2.963,2.359,2.014),
t=c(0.25,0.5,0.75,1),Imax=0.22)

typeIerr(GSD)
# }