February, 2003
© 2000, 2001 Scott S. Emerson, M.D., Ph.D.
Session 3: 8
Schedule of Analyses
Example: Analyses after 40%, 60%, 80%, 100% (maintain power)
Null: Theta <= 0      (size  = 0.025)
Alt : Theta >= 0.5    (power = 0.975)
(Emerson & Fleming (1989) symmetric test)
STOPPING BOUNDARIES: Sample Mean scale
                            a      d
    Time 1 (N= 131.97) 0.1047 0.3953
    Time 2 (N= 197.95) 0.1773 0.3227
    Time 3 (N= 263.93) 0.2205 0.2795
    Time 4 (N= 329.91) 0.2500 0.2500