February, 2003
© 2000, 2001 Scott S. Emerson, M.D., Ph.D.
Session 3: 13
Schedule of Analyses
Example: Analyses after 20%, 40%, 60%, 80%, 100% (maintain maximal sample size)
Null: Theta <= 0         (size  = 0.025)
Alt : Theta >= 0.5109    (power = 0.975)
(Emerson & Fleming (1989) symmetric test)
STOPPING BOUNDARIES: Sample Mean scale
                             a      d
    Time 1 (N=  69.05) -0.0603 0.5713
    Time 2 (N= 138.09)  0.1070 0.4039
    Time 3 (N= 207.14)  0.1811 0.3298
    Time 4 (N= 276.19)  0.2253 0.2856
    Time 5 (N= 345.23)  0.2555 0.2555