Two Stage

The TWOSTAGE program is a program that calculates:

  1. Estimates of sample size for a two-stage study.
  2. Rejection (ri) and Acceptance (ai) points for a two-stage trial.
  3. Power for an array of Pa compared to a fixed P0.
User Input
Program Output

Select Hypothesis Test Parameters

Null Proportion
Alternative Proportion
Alpha
Power
N1
N2


A1
A2
R1
R2


Power Pa Early H0/PA Early HA/PA

Alpha
Early H0/P0
Early HA/P0

A1, A2, R1 or R2 may be changed from values calculated