CumAlpha: Cumulative Alpha for the Fixed Z-value

In sasLM: 'SAS' Linear Model

Cumulative Alpha for the Fixed Z-value

Description

Cumulative alpha values with repeated hypothesis with a fixed upper bound z-value.

Usage

  CumAlpha(x, K=2, side=2)

Arguments

x	fixed upper z-value bound for the repeated hypothesis test
K	total number of tests
side	1=one-side test, 2=two-side test

Details

It calculates cumulative alpha-values for the even-interval repeated hypothesis test with a fixed upper bound z-value. It assumes linear (proportional) increase of information amount and Brownian motion of z-value, i.e. the correlation is sqrt(t_i/t_j).

Value

The result is a matrix.

ti	time of test, Even-interval is assumed.
cum.alpha	cumulative alpha valued

Author(s)

Kyun-Seop Bae [e-mail]

References

Reboussin DM, DeMets DL, Kim K, Lan KKG. Computations for group sequential boundaries using the Lan-DeMets function method. Controlled Clinical Trials. 2000;21:190-207.

Examples

  CumAlpha(x=qnorm(1 - 0.05/2), K=10) # two-side Z-test with alpha=0.05 for ten times

sasLM documentation built on Oct. 2, 2024, 9:06 a.m.