February, 2003
© 2000, 2001 Scott S. Emerson, M.D., Ph.D.
Session 3: 44
Schedule of Analyses
Example: Stopping rule based on updated schedule (when first analysis boundary unconstrained)
One-sided test of a greater alternative:
Null : Theta <= 0      (size  = 0.025)
Alt  : Theta >= 0.4973 (power = 0.975)
(Emerson & Fleming (1989) symmetric test)
STOPPING BOUNDARIES: Sample Mean scale
                             a      d
    Time 1 (N=  77.08) -0.0740 0.5713
    Time 2 (N= 100.00)  0.0087 0.4887
    Time 3 (N= 231.23)  0.2018 0.2955
    Time 4 (N= 308.31)  0.2487 0.2487