esDesign (version 1.0.3)

SigP: Commonly used \(\alpha\)-spending functions

Description

The SigP() is used to calculate the reduced significant level based on several widely used \(\alpha\)-spending functions, such as the "Pocock", "Lan-DeMets", "O`Brein-Fleming" and "Power" functions.

Usage

SigP(alpha, Info, esFunction = "Pocock", gamma = 1)

Arguments

alpha

The overall Type I error rate

Info

The fraction of the observed information

esFunction

The specific \(\alpha\)-spending function. For example, esFunction = "Pocock" for the Pocock method, esFunction = "LD" for the Lan-Demets method, esFunction = "OF" for the O'Brein-Fleming method, and esFunction = "Power" for the Power method.

gamma

The parameter used in the Power method. The default value is gamma = 1.

Value

The reduced significant level

Examples

# NOT RUN {
alpha <- 0.05
Info <- 0.5
esFunction = "OF"
SigP(alpha = alpha, Info = Info, esFunction = esFunction)
# }